СТАЛЬ С ОЧЕНЬ ВЫСОКОЙ МЕХАНИЧЕСКОЙ ПРОЧНОСТЬЮ, СПОСОБ ПОЛУЧЕНИЯ ЛИСТА ИЗ СТАЛИ С ПОКРЫТИЕМ ИЗ ЦИНКАИЛИ ЦИНКОВОГО СПЛАВА И ЕГО ПРИМЕНЕНИЕ

Изобретение относится к металлургии, а именно к стали с очень высокой механической прочностью, листу, выполненному из такой стали, способу его получения, и может быть использовано в автомобильной промышленности. Сталь содержит, мас.%: 0,080≤С≤0,120, 0,800≤Mn≤0,950, Si≤0,300, Cr≤0,300, 0,150≤Mo≤0,350, 0, 020≤Al≤0,100, Р≤0,100, В≤0,010, Ti≤0,050, остальное - железо и примеси, образовавшиеся при выплавке, при этом микроструктура образована ферритом и мартенситом. Способ получения стального листа включает отливку листового слитка, горячую и холодную прокатки слитка для получения листа, нагрев листа со скоростью 2-100°С/с до температуры выдержки 700-900°С, охлаждение листа со скоростью 2-100°С/с до температуры, близкой к температуре ванны жидкого цинка или цинкового сплава, нанесение на лист покрытия из цинка или цинкового сплава погружением в указанную ванну и охлаждение до температуры окружающей среды со скоростью 2-100°С/с. Сталь имеет высокую прочность и способность к цинкованию. 4 н. и ...

СОСТАВ СВЕРХПРОЧНОЙ СТАЛИ, СПОСОБ ПОЛУЧЕНИЯ ИЗДЕЛИЯ ИЗ СВЕРХПРОЧНОЙ СТАЛИ И ПОЛУЧАЕМОЕ ИЗДЕЛИЕ

Изобретение относится к изделию из сверхпрочной стали и способу его получения. Изделие выполнено из сверхпрочной стали, содержащей, по меньшей мере, бейнитную фазу и/или мартенситную фазу, распределение фаз таково, что бейнитная и мартенситная фазы составляют в сумме более 35%. Способ получения изделия включает приготовление стального сляба, горячую прокатку указанного сляба, причем температура конца прокатки выше температуры Аr3, с образованием горячекатаной подложки, охлаждение до температуры смотки в рулон, смотку в рулон указанной подложки при температуре смотки от 450 до 750°С, травление указанной подложки с целью удаления оксидов. Согласно изобретению получают холоднокатаный и, в ряде случаев, горячеоцинкованный стальной лист с толщиной менее 1 мм и значениями предела прочности на растяжение 800-1600 МПа, тогда как удлинение А80 составляет от 5 до 17% в зависимости от параметров технологического процесса. Состав стали изделия подобран таким образом, что удается достичь высоких уровней ...

СПОСОБ НЕПРЕРЫВНОГО ОТЖИГА И ПОДГОТОВКИ ПОЛОСЫ ИЗ ВЫСОКОПРОЧНОЙ СТАЛИ ДЛЯ ЕЕ ЦИНКОВАНИЯ ПУТЕМ ОКУНАНИЯ С ПОДОГРЕВОМ

Изобретение относится к непрерывному отжигу и подготовке полосы из высокопрочной стали для нанесения покрытия путем окунания с подогревом в ванну с расплавом. В способе полосу обрабатывают в, по меньшей мере, двух секциях, последовательно расположенных в направлении движения полосы, включающих секцию нагрева и температурной выдержки, в которой полосу нагревают, а затем выдерживают при заданной температуре отжига в окислительной атмосфере, и секцию охлаждения и перемещения, в которой отожженную полосу, по меньшей мере, охлаждают и подвергают полному восстановлению оксид железа, присутствующий в оксидном слое, до металлического железа в восстановительной атмосфере. Секции разделены обычным воздушным шлюзом, при этом окислительную атмосферу, по меньшей мере, частично отделяют от восстановительной атмосферы, поддерживают регулируемое содержание кислорода в секции нагрева и температурной выдержки на уровне от 50 до 1000 частей на миллион и поддерживают регулируемое содержание водорода в секции ...

ВЫСОКОПРОЧНЫЙ СТАЛЬНОЙ ЛИСТ, ИМЕЮЩИЙ ПРЕВОСХОДНУЮ УДАРОПРОЧНОСТЬ, И СПОСОБ ЕГО ПРОИЗВОДСТВА, И ВЫСОКОПРОЧНЫЙ ГАЛЬВАНИЗИРОВАННЫЙ СТАЛЬНОЙ ЛИСТ И СПОСОБ ЕГО ПРОИЗВОДСТВА

Изобретение относится к области металлургии, а именно к высокопрочному стальному листу, используемому в автомобилестроении. Лист выполнен из стали, содержащей, мас.%: С от 0,075 до 0,3, Si от 0,3 до 2,5, Mn от 1,3 до 3,5, Р от 0,001 до 0,05, S от 0,0001 до 0,005, Al от 0,001 до 0,05, Ti от 0,001 до 0,015, N от 0,0001 до 0,005, О от 0,0001 до 0,003, железо и неизбежные примеси - остальное. Сталь листа имеет структуру, в которой в диапазоне от 1/8 до 3/8 толщины листа через 1/4 толщины листа содержится 1-8% остаточного аустенита в объемных долях, среднее отношение длин сторон зерен остаточного аустенита составляет 2,0 или меньше, количество марганца в твердом растворе в остаточном аустените превышает среднее количество Mn в стали в 1,1 раза или больше, содержатся частицы TiN, имеющие средний диаметр 0,5 мкм или меньше, а плотность частиц AlN с диаметром зерна 1 мкм или больше составляет 1,0 частица/ммили меньше. Лист имеет максимальный предел прочности 900 МПа или больше и высокую ударопрочность ...

СПОСОБ НАНЕСЕНИЯ ГОРЯЧИХ МЕТАЛЛИЧЕСКИХ ПОКРЫТИЙ

Изобретение относится к технике горячего нанесения цинковых, алюминий-цинковых, цинк-алюминиевых и алюминиевых покрытий на металлические изделия, в первую очередь на изделия из углеродистых и низколегированных сталей, и может быть использовано как для защиты изделий от коррозионного разрушения, так и для нанесения декоративных покрытий на изделия разного назначения. Способ включает химическую подготовку поверхности изделия с нанесением низкоплавких солей хлоридов металлов, нагрев во флюсе - расплаве до температуры выше рабочей температуры расплава металла покрытия, кратковременное погружение в расплав металла покрытия и скоростное охлаждение. Нагрев изделий во флюсе-расплаве осуществляют последовательно в две стадии - сначала во флюсе-расплаве с рабочей температурой до 200-550°С, а затем во флюсе-расплаве другого состава с рабочей температурой до 700-900°С. Изобретение позволяет совмещать разные операции при нанесении покрытий, в том числе обработку металлов давлением нагретых изделий, ...

СПОСОБ ИЗГОТОВЛЕНИЯ ЛИСТОВОЙ СТАЛИ С ПОКРЫТИЕМ

Группа изобретений относится к листовой стали с покрытием, способу изготовления листовой стали с покрытием и сварному соединению. Предложена листовая сталь с покрытием, содержащим от 10 до 40 мас. % никеля и остальное представляет собой цинк. Причем листовая сталь обладает микроструктурой, содержащей от 1 до 50 % остаточного аустенита, от 1 до 60 % мартенсита и необязательно по меньшей мере одну микроструктуру, выбранную из бейнита, феррита, цементита и перлита. Способ изготовления листовой стали с покрытием включает следующие далее стадии: А) получение отожженной листовой стали, характеризующейся определенным химическим составом, при котором листовую сталь подвергают отжигу при температуре в диапазоне между 600 и 1200°С, и В) нанесение на листовую сталь, полученную на стадии А), покрытия, содержащего от 1 до 40 мас. % никеля и остальное представляет собой цинк. Изобретение обеспечивает получение листовой стали с покрытием, которой не свойственны проблемы, связанные с жидкометаллическим ...

ТЕХНОЛОГИЧЕСКАЯ ЛИНИЯ МНОГОЦЕЛЕВОЙ ПЕРЕРАБОТКИ ДЛЯ ТЕРМИЧЕСКОЙ ОБРАБОТКИ И НАНЕСЕНИЯ ПОКРЫТИЯ В РЕЗУЛЬТАТЕ ПОГРУЖЕНИЯ В РАСПЛАВ ДЛЯ СТАЛЬНОЙ ПОЛОСЫ

Технологическая линия многоцелевой непрерывной переработки, способная обеспечивать проведение термической обработки и нанесение покрытия в результате погружения в расплав для стальной полосы, включающая: секцию отжига (1) для нагревания стальной полосы до предварительно определенной температуры отжига и для выдерживания стальной полосы при упомянутой температуре отжига, первую секцию перемещения (2), секцию перестаривания (3), способную обеспечивать выдерживание температуры стальной полосы в диапазоне от 300°С до 700°С, вторую секцию перемещения (4), способную обеспечивать подстраивание температуры стальной полосы для достижения возможности нанесения покрытия в результате погружения в расплав для полосы, и секцию нанесения покрытия в результате погружения в расплав (5), где первая секция перемещения (2) включает в последовательности средства охлаждения (21) и средства нагревания (22). 9 з.п. ф-лы, 2 ил.

СПОСОБ ПРОИЗВОДСТВА ГОРЯЧИМ ЦИНКОВАНИЕМ МЕТОДОМ ПОГРУЖЕНИЯ СТАЛЬНОГО ЛИСТА, ОБЛАДАЮЩЕГО ПРЕКРАСНЫМИ ОБРАБАТЫВАЕМОСТЬЮ, ВЫКРАШИВАЕМОСТЬЮ И СКОЛЬЗКОСТЬЮ

Изобретение относится к производству горячеоцинкованного стального листа, обладающего улучшенной обрабатываемостью, выкрашиваемостью и скользкостью. В способе сляб, содержащий в мас.%: С от 0,01 до 0,12, Мn от 0,05 до 0,6, Si от 0,002 до 0,1, Р 0,05 или меньше, S 0,03 или меньше, растворенный Аl от 0,005 до 0,1, N 0,01 или меньше, Fe и неизбежные примеси - остальное, обрабатывают горячей прокаткой, травлением и холодной прокаткой с последующими отжигом листа при температуре от 650 до 900°С, охлаждением до температуры от 250 до 450°С, выдерживанием при этой температуре в течение 120 мин или более, с дальнейшим охлаждением до комнатной температуры, травлением, предварительным покрытием Ni или Ni-Fe без промежуточной дрессировки, нагревом со скоростью 5°С/сек или более до температуры от 430 до 500°С, цинкованием в гальванической ванне, осушкой, нагревом со скоростью подъема температуры 20°С/сек или более до температуры от 460 до 550°С без выдержки или с выдержкой в течение менее 5 сек, охлаждением ...

СТАЛЬНАЯ ПОЛОСА С ХОРОШИМИ ХАРАКТЕРИСТИКАМИ ДЕФОРМИРУЕМОСТИ, А ТАКЖЕ СПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

Изобретение относится к изготовлению стальной полосы для деталей, изготовленных глубокой вытяжкой или вытяжкой с утонением. Горячекатаную полосу подвергают травлению, холодной прокатке в один или несколько приемов и при степени обжатия, по меньшей мере, 86%. Затем, по меньшей мере, одну сторону материала полосы покрывают гальваническим покрытием, содержащим Ni, Со, Cu, Fe, Sn, In, Pd, Bi и/или их сплавы, или плакированным прокаткой покрытием, содержащим Cu, и/или латунь, и/или их сплавы, отжиг полосы в намотанном состоянии - в рулоне и при необходимости дрессировку полосы. Горячекатаная полоса предпочтительно содержит бор в количестве 0,0013-0,0060 вес. %, причем весовое соотношение бора и азота составляет 0,5-2,5. Изобретение позволяет уменьшить производственные затраты за счет уменьшения количества операций. 2 с. и 5 з. п. ф-лы, 2 табл.

ИЗДЕЛИЯ ИЗ ВЫСОКОПРОЧНОЙ СТАЛИ И СПОСОБЫ ИХ ИЗГОТОВЛЕНИЯ

Изобретение относится к изделиям из высокопрочной стали, обладающим благоприятными свойствами, и к способам отжига таких изделий. Способ термической обработки холоднокатаного листа из высокопрочной стали, содержащей, мас.%: от 0,12 до 0,5 С, от 1 до 3 Mn, от 0,8 до 3 комбинации Si и Al, включает проведение двухэтапного отжига листа. Первый этап отжига включает стадии, на первой из которых осуществляют нагрев листа до температуры от 820 до 980°С и выдержку в течение 20-500 сек, а на второй стадии - закалку при температуре ниже температуры окончания мартенситного превращения (MF) с последующим охлаждением ниже 300°С со скоростью, обеспечивающей формирование мартенситной структуры. Второй этап отжига включает стадии, на первой из которых осуществляют нагрев и томление при температуре от 720 до 850°С в течение 15-300 сек с последующим охлаждением до второй стадии, на которой при температуре от 360 до 440°С осуществляют выдержку в течение не более 800 сек. Формируемая при проведении двухэтапного ...

СПОСОБ НАНЕСЕНИЯ АЛЮМИНИЕВОГО ИЛИ ЦИНКОВОГО ПОКРЫТИЯ НА ИЗДЕЛИЯ ИЗ ЧУГУНА ИЛИ СТАЛИ, ИСПОЛЬЗУЕМЫЕ СПЛАВЫ, ФЛЮСЫ И ПОЛУЧАЕМЫЕ ИЗДЕЛИЯ

Изобретение относится к области металлургии. Способ нанесения алюминиевого или цинкового покрытия на изделия из чугуна или стали включает предварительную подготовку поверхности покрываемого изделия, погружение покрываемого изделия полностью в расплав теплоносителя, слой которого расположен под слоем расплава материала покрытия значительно меньшей толщины, выдержку покрываемого изделия до температуры теплоносителя и последующее извлечение изделия через верхний слой расплава материала покрытия, в ходе которого происходит нанесение слоя покрытия, при этом предварительную подготовку поверхности изделия осуществляют струйно-абразивной обработкой смесью остроконечных колотых частиц стальной или чугунной дроби с размерами, лежащими в пределах 0,3-1,0 мм, и стальной или чугунной дробью глобулярной формы, размер которой лежит в пределах 1,0-2,0 мм, при скорости подачи частиц 60-120 м/сек. Для нанесения цинкового покрытия используют флюс, представляющий собой водный раствор, содержащий ZnCl2 400 ...

СПОСОБ ГОРЯЧЕГО ЦИНКОВАНИЯ

Изобретение относится к способу горячего цинкования, в частности длинных и узких деталей. Способ включает последовательное прохождение по меньшей мере одной обезжиривающей, травильной и флюсовой ванн, сушку, подачу деталей в цинковальную ванну и последующее охлаждение оцинкованных деталей, при этом детали в ванны предварительной обработки подают посредством непрерывно движущейся в такт транспортной системы в направлении транспортировки к установленным преимущественно друг за другом ваннам предварительной обработки, из которых по меньшей мере одна ванна выполняет одновременно несколько операций предварительной обработки, температуру в ваннах предварительной обработки поддерживают более высокой по сравнению с комнатной температурой, при этом ванны присоединены по крайней мере к одному устройству отсоса образующихся паров. Способ позволяет значительно сократить время прохождения заготовок через ванны, что приводит к уменьшению расходов. 5 з.п. ф-лы, 1 ил.

ПОДВЕРГНУТЫЙ ЧИСТОВОМУ ОТЖИГУ, ВЫСОКОПРОЧНЫЙ СТАЛЬНОЙ ЛИСТ С ПОКРЫТИЕМ, ИМЕЮЩИЙ ПОВЫШЕННЫЙ ПРЕДЕЛ ТЕКУЧЕСТИ И УЛУЧШЕННУЮ СТЕПЕНЬ РАЗДАЧИ ОТВЕРСТИЯ

Изобретение относится к области металлургии. Для повышения предела текучести и степени раздачи отверстия отожжённого холоднокатаного стального листа с покрытием способ включает получение стального листа, содержащего в мас.%: С 0,1 – 0,3, Mn 1 – 3, Si 0,5 – 3,5, Al 0,05 – 1,5, Mo + Cr в диапазоне 0,2 – 0,5, железо и неизбежные примеси - остальное, холодную прокатку листа, нанесение цинкового покрытия на холоднокатаный лист с получением холоднокатаного листа с покрытием с пределом текучести между 550 и 580 МПа и степенью раздачи отверстия ниже 10%, отжиг упомянутого стального листа после нанесения указанного цинкового покрытия, причем указанный отжиг после нанесения покрытия осуществляют при температуре 150-650°C в течение периода времени, достаточного для повышения предела текучести отожженного холоднокатаного стального листа с покрытием по меньшей мере на 40% по сравнению с холоднокатаным стальным листом непосредственно после нанесения покрытия, и увеличения степени раздачи отверстия отожженного ...

СПОСОБ ИЗГОТОВЛЕНИЯ СТАЛЬНОЙ ПОЛОСЫ C УЛУЧШЕННОЙ АДГЕЗИЕЙ НАНОСИМЫХ МЕТОДОМ ГОРЯЧЕГО ПОГРУЖЕНИЯ МЕТАЛЛИЧЕСКИХ ПОКРЫТИЙ

Изобретение относится к изготовлению стальной полосы с улучшенной адгезией наносимых методом горячего погружения металлических покрытий, с содержанием, помимо железа в качестве основного компонента и неизбежных примесей, одного или нескольких из следующих кислород-аффинных элементов, мас.%: Al более 0,02, Cr более 0,1, Mn более 1,3 или Si более 0,1. В способе поверхность стальной полосы очищают, подвергают окислительной обработке при температуре ниже 200°C путем анодного оксидирования с образованием на поверхности стальной полосы оксидного слоя с минимальной толщиной от по меньшей мере 5 нм до максимум 500 нм, подвергают отжигу с последующим нанесением покрытия методом горячего погружения. Анодное оксидирование выполняют при плотностях тока от 50 до 400 А/дм2 и в 20-60%-ном растворе NaOH или растворе КОН при температуре электролита по меньшей мере 45°С до температуры максимум на 3°С ниже температуры кипения электролита. Причем на поверхности стальной полосы при образовании оксидов с железом ...

СПОСОБ НАНЕСЕНИЯ ПОКРЫТИЙ ИЗ ПОЛИВИНИЛБУТИРАЛЯ НА ДЕТАЛИ СУДОВОГО МАШИНОСТРОЕНИЯ

Способ нанесения покрытия из поливинилбутираля на детали судового машиностроения включает нагрев детали до температуры 270-300oC, погружение детали в ванну с краской, находящейся в псевдоожиженном состоянии, удаление детали из ванны и дополнительный нагрев. При этом псевдоожиженое состояние создают путем заполнения ванны порошком на 1/3 объема с такой плотностью, чтобы в псевдоожиженном состоянии он занимал 2/3 объема ванны, и подаче избыточного давления воздуха пpи давлении 0,02-0,03 МПа через пористую перегородку. 4 з.п. ф-лы, 3 табл.

СТАЛЬНОЙ ЛИСТ С ПОКРЫТИЕМ И ДЕТАЛЬ ИЗ ВЫСОКОПРОЧНОЙ УПРОЧНЁННОЙ ПРЕССОВАНИЕМ СТАЛИ И СПОСОБ ИХ ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к получению стальных листов с покрытием, используемых в качестве материала для изготовления на формовочном прессе конструкционных деталей или деталей безопасности транспортных средств. Стальной лист выполнен из стали, имеющей состав, содержащий в мас.%: С 0,15-0,25, Мn 0,5-1,8, Si 0,1-1,25, Al 0,01-0,1, Cr 0,1-1,0, Ti 0,01-0,1, В 0,001-0,004, Р ≤ 0,020, S ≤ 0,010, N ≤ 0,010, при необходимости по меньшей мере один из: Mo ≤ 0,40, Nb ≤ 0,08 и Са ≤ 0,1, остальное - железо и неизбежные примеси. Стальной лист с покрытием содержит основную часть, обезуглероженный слой, покрывающий основную часть, и слой покрытия из алюминиевого сплава. Основная часть листа имеет микроструктуру, содержащую в долях поверхности 60-90% феррита, при этом остальная часть представляет собой мартенситно-аустенитные островки, перлит или бейнит. Обезуглероженный слой состоит в верхней части из слоя феррита толщиной 1-100 мкм. Изготавливаемые из таких листов детали обладают ...

СПОСОБ ПОЛУЧЕНИЯ СТАЛИ, ИМЕЮЩЕЙ ДВУХФАЗНУЮ СТРУКТУРУ

... 1. Способ получения листа стали, имеющей зарождающуюся двухфазную микроструктуру, где указанный лист стали имеет состав, мас.%: углерод 0,02-0,20; алюминий 0,010-0,150; титан максимум 0,01; кремний максимум 0,5; фосфор максимум 0,060; сера максимум 0,030; марганец 1,5-2,40; хром 0,03-1,50; молибден 0,03-1, 50; при условии, что количества марганца, хрома и молибдена имеют соотношение (Mn+6Сr+10Мо) равно по меньшей мере 3,5%, включающий томление указанного листа стали в течение от 20 до 90 секунд при температуре в диапазоне от Ac1+25°C (45°F), но по меньшей мере 727°С (1340°F), но не более чем 775°С (1425°F), охлаждение указанного листа стали со скоростью по меньшей мере 1°С в секунду до температуры в диапазоне 454-493°С (850-920°F), и выдержку указанного листа стали в диапазоне 454-493°С (850-920°F) в течение от 20 до 100 с. 2. Способ по п.1, где указанный лист стали представляет собой стальную ленту, и указанный способ осуществляют непрерывно на стальной ленте длиной по меньшей мере 304,89 ...

СПОСОБ ПРОИЗВОДСТВА ВЫСОКОПРОЧНОЙ ЛИСТОВОЙ СТАЛИ, ХАРАКТЕРИЗУЮЩЕЙСЯ ВЫСОКИМИ ПЛАСТИЧНОСТЬЮ, ДЕФОРМИРУЕМОСТЬЮ И СВАРИВАЕМОСТЬЮ, И ПОЛУЧЕННАЯ ЛИСТОВАЯ СТАЛЬ

Изобретение относится к области металлургии. Для получения листовой стали с нанесенным покрытием, обладающей заданными механическими свойствами совместно с высокой свариваемостью, в особенности высокой свариваемостью при использовании контактной точечной сварки, способ включает получение холоднокатаной листовой стали, содержащей, мас.%: 0,15 ≤ С ≤ 0,23, 1,4 ≤ Mn ≤ 2,6, 0,6 ≤ Si ≤ 1,3, при этом С + Si/10 ≤ 0,30, 0,4 ≤ Al ≤ 1,0, причем Al ≥ 6(C + Mn/10) - 2,5, 0,010 ≤ Nb ≤ 0,035, 0,1 ≤ Мо ≤ 0,5, отжиг листа при температуре в диапазоне 860-900°С для получения структуры, состоящей из по меньшей мере 90% аустенита и по меньшей мере 2% межкритического феррита, закалку до температуры в диапазоне от Ms - 10°С до Ms - 60°С при скорости Vc, составляющей более чем 30°С/с, нагрев до температуры РТ в диапазоне от 410°С до 470°С на протяжении от 60 до 130 с, нанесение на лист покрытия в результате погружения в расплав и охлаждение до комнатной температуры. Микроструктура содержит от 45 до 68% мартенсита ...

ГОРЯЧЕКАТАНЫЙ СТАЛЬНОЙ ЛИСТ С ВЫСОКИМ ОТНОШЕНИЕМ ПРЕДЕЛА ТЕКУЧЕСТИ К ПРЕДЕЛУ ПРОЧНОСТИ, КОТОРЫЙ ИМЕЕТ ПРЕВОСХОДНЫЕ ХАРАКТЕРИСТИКИ ПОГЛОЩЕНИЯ ЭНЕРГИИ УДАРА ПРИ НИЗКОЙ ТЕМПЕРАТУРЕ И УСТОЙЧИВОСТЬ К РАЗМЯГЧЕНИЮ ЗОНЫ ТЕРМИЧЕСКОГО ВЛИЯНИЯ (HAZ), И СПОСОБ ЕГО ПОЛУЧЕНИЯ

Изобретение относится к области металлургии, а именно к получению горячекатаного стального листа, используемого в машиностроении. Лист выполнен из стали, содержащей в мас.%: С: от 0,04 до 0,09, Si: 0,4 или менее, Mn: от 1,2 до 2,0, Р: 0,1 или менее, S: 0,02 или менее, Al: 1,0 или менее, Nb: от 0,02 до 0,09, Ti: от 0,02 до 0,07, N: 0,005 или менее, Fe и неизбежные примеси остальное. Для компонентов стали выполняется соотношение 2,0≤Mn+8[%Ti]+12[%Nb]≤2,6. Лист имеет микроструктуру, в которой процентная доля площади перлита составляет 5% или менее, общая процентная доля площади мартенсита и остаточного аустенита составляет 0,5% или менее, остальная структура представляет собой феррит и/или бейнит. Средний размер зерен феррита и бейнита составляет 10 мкм или менее, а средний размер частиц карбонитридов легирующих металлов с некогерентными межфазными границами, которые содержат Ti и Nb, составляет 20 нм или менее. Изготавливаемые листы имеют максимальный предел прочности на разрыв 600 МПа или ...

СПОСОБ ПРОИЗВОДСТВА СТАЛЬНОГО ЛИСТА С ПОКРЫТИЕМ, ИМЕЮЩЕГО ПОВЫШЕННУЮ ПРОЧНОСТЬ, ПЛАСТИЧНОСТЬ И ДЕФОРМИРУЕМОСТЬ

СПОСОБ ОБРАБОТКИ МЕТАЛЛИЧЕСКОГО ЛИСТА ДЛЯ УМЕНЬШЕНИЯ ЕГО ПОТЕМНЕНИЯ ИЛИ ПОТУСКНЕНИЯ ПРИ ХРАНЕНИИ И МЕТАЛЛИЧЕСКИЙ ЛИСТ, ОБРАБОТАННЫЙ ЭТИМ СПОСОБОМ

ВЫСОКОПРОЧНЫЙ, ГАЛЬВАНИЗИРОВАННЫЙ ГОРЯЧИМ СПОСОБОМ СТАЛЬНОЙ ЛИСТ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

... 1. Гальванизированный горячим способом стальной лист, причем стальной лист содержит, мас.%:C 0,10 - 0,4Si 0,01 - 0,5Mn 1,0 - 3,00 0,006 или менееP 0,04 или менееS 0,01 или менееAl 0,1 - 3,0N 0,01 или менееSi+Al≥0,5 остальное Fe и неизбежные примеси,при этом стальной лист является высокопрочным, гальванизированным горячим способом стальным листом, содержащим в качестве основной фазы в единицах объемной доли 40% или более феррита и от 8 до 60% остаточного аустенит, причем балансовая структура состоит из любого одного компонента или двух или более компонентов из бейнита, мартенсита и перлита,при этом из аустенита, аустенитное зерно, имеющее среднее остаточное напряжение σR, удовлетворяющее формуле (1), составляет 50% или более:-400 МПа ≤ σR ≤ 200 МПа (1)и при этом стальной лист имеет на поверхности полученный способом горячей гальванизации слой, содержащий Fe в количестве менее чем 7 мас.%, остальное Zn, Al и неизбежные примеси.2. Гальванизированный горячим способом стальной лист по п. 1, ...

СТАЛЬНОЙ ЛИСТ С Al-Zn ПОКРЫТИЕМ, НАНЕСЁННЫМ СПОСОБОМ ГОРЯЧЕГО ОКУНАНИЯ, И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

... 1. Стальной лист с Al-Zn покрытием, нанесенным способом горячего окунания, который включает слой Al-Zn покрытия с содержанием Al от 20% до 95% масс. на поверхности стального листа, в котором слой Al-Zn покрытия содержит от 0,01% до 10% масс. Са, и поверхностный слой стального листа в пределах 100 мкм от поверхности основного стального листа непосредственно под слоем Al-Zn покрытия содержит менее 0,060 г/мповерхности оксида, по меньшей мере, одного из Fe, Si, Mn, Al, Р, В, Nb, Ti, Cr, Mo, Cu и Ni в сумме.2. Стальной лист с Al-Zn покрытием, нанесенным способом горячего окунания, который включает слой Al-Zn покрытия с содержанием Al от 20% до 95% масс. на поверхности стального листа, в котором слой Al-Zn покрытия содержит от 0,01% до 10% масс. Са и Mg в сумме, и поверхностный слой стального листа в пределах 100 мкм от поверхности основного стального листа непосредственно под слоем Al-Zn покрытия содержит менее 0,060 г/мповерхности оксида, по меньшей мере, одного из Fe, Si, Mn, Al, Р, В, Nb ...

ХОЛОДНОКАТАНЫЙ СТАЛЬНОЙ ЛИСТ С ПОКРЫТИЕМ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

Изобретение относится к металлургии, а именно к холоднокатаному стальному листу с покрытием, и может быть использовано для транспортных средств. Холоднокатаный стальной лист с покрытием, в котором сталь содержит в мас.%: 0,30 ≤ углерод ≤ 0,45, 1 ≤ марганец ≤ 2,5, 0,9 ≤ кремний ≤ 2,2, 0 ≤ алюминий ≤ 0,09, 0,001 ≤ ниобий ≤ 0,09, 0 ≤ фосфор ≤ 0,02, 0 ≤ сера ≤ 0,03, 0 ≤ азот ≤ 0,09 и необязательно один или несколько из следующих элементов: 0 ≤ молибден ≤ 0,5, 0 ≤ хром ≤ 0,6, 0 ≤ титан ≤ 0,06, 0 ≤ ванадий ≤ 0,1, 0 ≤ кальций ≤ 0,005, 0 ≤ бор ≤ 0,010, 0 ≤ магний ≤ 0,05, 0 ≤ цирконий ≤ 0,05, 0 ≤ церий ≤ 0,1, остальное - железо и неизбежные примеси, при этом микроструктура указанного стального листа содержит 35-65% распределённого мартенсита в качестве основной структурной фазы, 15-40% бейнита, 14-30% остаточного аустенита, 4-15% феррита и 0-10% свежего мартенсита в долях площади. Лист имеет предел прочности при растяжении 1170 МПа и более, предел текучести 730 МПа и более, удлинение 18% и более ...

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Изобретение относится к подготовке поверхности стальных изделий перед нанесением горячих цинковых покрытий и может быть использовано в металлургической и металлообрабатывающей промьшшенности. Цель изобретения - снижение расхода реагентов и уменьшение образования отходов. Способ включает последовательную обработку в водных щелочных и не менее чем в трех кислых водных растворах на основе соляной кислоты, при этом начальный и конечный кислые растворы циркулируют по замкнутому контуру, идентичны по составу и содержат г/л соляной кислоты, а промежу- точньй - 15-80 г/л соляной кислоты. Способ .упрощает технологию подготовки поверхности, приводит к уменьшению образования отходов и расхода реаген-, тов. 1 табл. а S (Л оо со о ГС ...

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Изобретение относится к нанесению покрытий из железоуглеродистых сплавов горячим способом и может быть использовано в машиностроении. Цель изобретения - повышение прочности сцепления и сплошности покрытий. Способ нанесения покрытия из железоуглеродистого сплава на изделия включает очистку, нагрев до 870-920°С, флюсование, погружение в воду на 1-3 с, выдержку на воздухе 2-5 с и окунание изделия в расплав железоуглеродистого сплава. Использование изобретения позволяет получить сплошные покрытия на изделиях, увеличить протяженность зоны диффузионного сцепления до 70-80% на границе подложки и покрытия. 1 табл.

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СПОСОБ ПОЛУЧЕНИЯ АЛИТИРОВАННЫХ ИЗДЕЛИЙ ИЗ УГЛЕРОДИСТЫХ СТАЛЕЙ , включающий предварительное активирование поверхности изделий и последующее алитирование в расплаве при 700-740°С, отличающийся тем, что, с целью снижения времени алитирования, повышения равномерности покрытий и коррозионной стойкости изделий, активирование осуществляют ударной обработкой потоком твердых частиц размером 0,31 ,0 мм при скорости их подачи 60100 м/с. 9 ...

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Verfahren zum Herstellen eines mit einer Zinkbeschichtung versehenen Stahlbandes und zinkbeschichtetes Stahlband

Method and apparatus for continuous combined annealing and coating of metal wire

... 1,134,724. Coating wire with metal; annealing. OY NOKIA A.B. May 30, 1967 [May 31, 1966], No. 24881/67. Headings C7F and C7N. Metal wire 3 is annealed and coated with metal in a continuous process by heating it with an electric current passed through it between pulleys 1 and 2 and leading it through a coating bath 6 between the pulleys. Wire 3 may be of copper, and be passed through pickling and soldering agent basins before entering bath 6, which contains melted tin. Water bath 5 is used to cool the tinned wire 3. Wire 3 may be fed straight from the drawing machine in which it is produced, in which case no pickling and soldering agents are required to induce the tin to adhere to the copper wire. As it emerges from bath 6 surplus tin may be removed by a wiper.

WASHING METAL ARTICLES

... 1333229 Washing pickled metal articles DIDIER-WERKE A G 9 Dec 1970[9 Dec 1969] 58267/70 Heading C7E After being used to wash acid-pickled metal articles, the water is withdrawn from the washing zone and sufficient ammonia or ammonium carbonate added thereto to give said water a pH exceeding seven, and the water then returned to said zone. Metal articles that are to be hot galvanised or tin plated are pickled with hydrochloric acid in a bath 1, washed in a bath 2, treated with a flux e.g. NH 4 Cl or ZnCl 2 , in a bath 3, and galvanised or plated in a bath 4. Used wash water from the bath 2 passes to a tank 5 and has an ammonium hydroxide solution added to it from a tank 7 under the control of a pH meter 15. The mixture then passes to a sedimentation tank 6 where iron hydroxide separates out and is filtered off in a plant 8. The treated water is then returned to the bath 2 by a pump 22. The concentration of ammonium chloride in the recirculated water is monitored by a conductivity meter 20 ...

Manufacture of galvanized ferrous metal

A coating of boric acid and kaolin and/or attapulgite is applied to parts of a ferrous metal article, before galvanizing, to prevent galvanizing of those parts. The coating may be applied as a slurry to a steel strip in a continuous galvanizing process comprising cleaning, applying slurry, drying, annealing, dipping, removing the coating in water with a high-pressure water stream or a brush, drying and coiling. The strip may be kept under non-oxidizing conditions until it enters the galvanizing tank.

Variable angle attachment for infrared reflection spectroscopy

... 1,137,627. Spectrometers. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. June 27, 1966 [June 30, 1965], No.28721/66. Heading G2J. In an infrared spectrometer the incoming beam is directed from the sampling space 12 by one face of a prism 15 to a surface 23, which carries a transparent hemisphere 29 and an internal reflection cell 25 and is orthogonal to a reflecting surface 34 for re-directing the beam back to prism 15 and thence into the entrance aperture 13 of the spectrometer. Surfaces 23, 34 are rotated as a unit to vary the angle of incidence on the cell. When using a focused beam, the cell is also moved along surface 23 and the assembly comprising prism 15 and surfaces 23, 34 are displaced so as to maintain the same path length through the sampling space.

Molten metal infiltrating method and molten metal infiltrating apparatus

Improvements relating to the continuous processing of ferrous metal

A process of galvanizing hypo-eutectoid carbon-steel wire consists in the steps of heating the wire, while longitudinally advancing, to 400-500 DEG C. in an oxidising atmosphere, heating the oxidised wire to 850-950 DEG C. in a reducing atmosphere simultaneously to develop a temporary austenitic structure in the metal and reduce the oxide coating thereon, quenching the wire to 500-650 DEG C. to produce a sorbitic or pearlitic structure, passing the wire into a galvanizing bath of molten Zn at 425-500 DEG C. and withdrawing the wire from the bath with a coating of Zn adherent thereto. The quenching may be by passing the wire through (a) an externally cooled chamber containing a reducing atmosphere, (b) a molten metal bath or (c) a fluidized bed. Fig. 1 shows wire 1 being quenched in a chamber 5 cooled by a water jacket 6 and through which non-oxidising gas is circulated by a blower 7, the lower end of the chamber dipping into a bath 3 of the ...

Method of covering metal wires with one or more layers of molten metals, and apparatus for performing the method

In a method of metallizing wire obtained by a drawing process and covered with a layer of lubricant, the wire is first subjected to physical or physico-chemical processing to eliminate the layer of lubricant, then heat-treated in a reducing atmosphere, and finally, after controlled cooling, metallized by hot-dipping. The lubricant may be removed by ultrasonic or magnetic vibration in a liquid medium, or by shotting, sand-blasting or dry or wet brushing. Before the reducing heat treatment, the wire may be oxidised. Controlled cooling is effected in a muffle which is a continuation of the heat-treatment chamber and dips into the metallizing bath. Specified coating metals are aluminium, lead, tin and zinc.

Aluminum-Plated Steel Sheets

A process for preparing molten- aluminium-plated steel sheets having good formability and high oxidation resistance at elevated temperatures comprises producing a steel containing 0.001-0.020% of C, 0.05-0.30% of Mn, 0.05-0.50% of Cr, 0.01-0.10% of Al, and 0.10-0.50% and not less than 10 times the C content of Ti, and making the steel into a hot coil with the coiling temperature not lower than 700 DEG C, cold-rolling said hot coil and plating the cold-rolled sheet by heating it to a temperature not lower than 850 DEG C using an in-line annealing type plating apparatus with non- oxidizing furnace.

Improvements in or relating to Anti-Roll Devices for Automotive Vehicles

... 1,157,016. Preventing vehicle roll. SOC. ANON. ANDRE CITROEN. 22 July, 1966 [3 Aug., 1965; 24 Jan., 1966], No. 33179/66. Heading B7D. A vehicle suspension which provides for inward banking when travelling round a curve comprises a pair of wheel support arms 2, 21, which may be longitudinally or transversely disposed, connected by pistons and cylinders 6 and 61 to a stabilizer bar 3, 5, 51 pivotally mounted at 4 and 41 in the vehicle. The opposite ends of the cylinders 6 and 61 are connected together by lines 14 and 15 which are also connected to a distributer valve 13. The arms 2, 21 are interconnected by springs R3, R4, bell-cranks 9, 91 pivoted in the vehicle and a bar 10. The arms 5, 51 of the stabilizer bar are interconnected by springs R1 and R2, bell-cranks 7, 71 and a bar 8. An arm 11 is connected at B and V, respectively, to the bars 8 and 10 and a rod 12 is connected at D to the bar 11. The rod 12 ...

Improvements in the method of coating ferrous bodies with other metals

Ferrous articles to be metallized by hot dipping are first freed from carbon, oxides, &c. by heating in an atmosphere of an oxyhalide or other volatile oxygen-yielding salt of zinc, cadmium, or magnesium, the temperature being such that carbon present on the surface of the article is converted into carbon monoxide or carbon dioxide and that oxides &c. are converted into volatile compounds, e.g. halides. The zone in which the decarbonizing &c. is carried out is separated from the molten metal bath by packing material to prevent contact between the molten metal and the gases in the cleaning zone and between the air and the cleaned article. The volatile oxygen-yielding salts may be produced in situ, for example the article may first be dipped into a solution of zinc chloride or cadmium chloride or mixtures thereof and then passed into the cleaning zone and heated to about 500-700 DEG C. to form an atmosphere comprising hydrochloric acid and zinc oxychloride, cadmium oxychlorhydrate, or mixtures ...

Improvements in or relating to the coating of metal with a second metal

... 817,209. Coating metals with metals. BRITISH IRON & STEEL RESEARCH ASSOCIATION. Oct. 14, 1955 [Oct. 14, 1954], No. 29625/54. Class 82(2) Continuous or elongated metal bodies ("strip") (e.g., steel) are coated by applying liquid metal (e.g. aluminium, zinc or tin) by applying means so arranged that there is relative movement between a liquid metal applying surface and a liquid metal receiving surface. This relative movement permits of thickness control of the coating. Fig. 1 shows a steel strip 12 passing via a conventional degreaser 14 to a duct 18, then over applying rolls 22, 24 revolving partially immersed in tin baths 26 and into a cooling bath 28 past nozzles 29, 30 delivering cooling medium (water, an emulsion of cotton seed oil in water, or steam). Rubber rollers 31, 32 remove the cooling medium and the strip is dried in ducting 33 in a stream of warm air. A non-oxidizing gas including nitrogen is drawn in at 37 and expelled at 38. In another embodiment (not shown) the two coating ...

Methods and apparatus for treating metallic strands in hot dip coating

... 918,372. Coating with aluminium. ARMCO STEEL CORPORATION. Sept. 26, 1961 [Sept. 26, 1960], No. 34522/61. Class 82 (2). Prior to coating with molten aluminium, with or without Si, Be and Mg, a metallic strand is chemically cleaned, dried, heated and treated with K, Si or preferably Na vapour in a non- oxidizing or reducing atmosphere. The treatment is carried out in the apparatus of Fig. 1 in which the radiant heat from the strand 15 vaporizes the sodium and the non-oxidizing or reducing gas is supplied through pipe 21. The cartridge 33 containing the sodium 36 on top of the reaction products 37 is held in a side arm 23 welded over opening 22 and may be surrounded by insulation 38 to ensure that the radiant heat of the strand 15 is sufficient to vaporize the sodium. After the treatment detailed above the strand passes upwards into the coating pot containing the molten aluminium.

Improvements in or relating to the annealing and galvanizing of ferrous metal sheets, strip wire or tubing

... 812,346. Annealing and galvanizing. KELLER, J. D. April 9, 1957, No. 11518/57. Classes 72 and 82(2) A method of continuously annealing and galvanizing long lengths of ferrous strip, including sheet, wire and tubing, comprises passing the strip through a molten alkali metal bath so that the strip passes through zones of increasing temperature to the annealing temperature and then decreasing temperature until it has a temperature corresponding to the galvanizing temperature, removing the alkali metal from the surface of the strip, passing the strip through a gaseous atmosphere which has no detrimental effect on the surface thereof, and finally passing the clean strip through a galvanizing bath. As shown, the strip 3 may pass through an annealing chamber filled with molten sodium as described in Specification 812,345 then into a chamber 24 containing a gas, e.g. a gas containing hydrochloric acid, or nitrogen having 2-25 per cent hydrogen, and finally through a galvanizing bath 29. Pads 22 ...

VERFAHREN ZUM HERSTELLEN EINES WENIGSTENS EIN LAGERAUGE AUFWEISENDEN WERKSTÜCKES

PROCEDURE AND DEVICE FOR THE TREATMENT OF THE EXTERIORS SURFACE OF A METAL WIRE, IN PARTICULAR AS COATING PRETREATMENT

PROCEDURE AND DEVICE FOR DESCALING A METAL BAND

PROCESS AND PLANT FOR PROCESSING FLUX USED FOR STEEL PRETREATMENT

Process for processing flux used for steel pretreatment, according to which the flux is continuously taken from a flux bath, admixed with ammonia, mixed and then continuously admixed with an oxygen-containing medium. Subsequently, precipitated iron salts are sedimented, collected and removed from the flux which is then returned to the flux bath. A plant for carrying out the process comprises a pipe 1 which is connected to a flux bath and has a feed line 6 for ammonia to be added to the flux provided with a measuring pump 8 regulated as a function of a pH meter 7 and in which, viewed in the flow direction 4 of the flux, a mixer 5 is provided downstream of the junction with the ammonia feedline 6 and upstream of the pH meter 7 and downstream thereof there is connected a feedline 10 for oxygen-containing medium and further downstream a further mixer 13. The pipe 1 leads into a settling vessel 15 to which a return line 26 to the flux bath is connected. ...

VERFAHREN ZUM HERSTELLEN EINES WENIGSTENS EIN LAGERAUGE AUFWEISENDEN WERKSTÜCKES

CHIMÄRER ANTI-CD20 ANTIBODY, RITUXAN, FOR USE IN THE TREATMENT THE CHRONIC LYMPHATIC LEUKEMIE

VERFAHREN ZUM FEUERVERZINKEN METALLISCHER WERKSTUECKE

METHOD FOR IMPROVING THE COATABILITY OF A METAL STRIP

Den Gegenstand dieser Erfindung bildet ein Verfahren zur Behandlung eines Metallbandes (1). Dabei wird das Metallband (1) in einem Ofen (2) wärmebehandelt und nachfolgend in einer Beschichtungsanlage (3) beschichtet. Erfindungsgemäß werden nach der Wärmebehandlung und vor der Beschichtung Oberflächenoxide am Metallband (1) mit Hilfe eines Lasers (5) entfernt.

PROCEDURE FOR MANUFACTURING A AT LEAST ONE BEARING CENTRE OF EXHIBITING WORKPIECE

PROCEDURE FOR THE PRODUCTION OF TINNED VOLUMES OR SHEET METALS FROM COPPER OR A COPPER ALLOY

VERFAHREN ZUM HERSTELLEN EINES WENIGSTENS EIN LAGERAUGE AUFWEISENDEN WERKSTÜCKES

VERFAHREN ZUM KONTINUIERLICHEN UEBERZIEHEN VON STAHLBAENDERN MIT GESCHMOLZENEM METALL

PROCEDURE FOR MANUFACTURING A AT LEAST ONE BEARING CENTRE OF EXHIBITING WORKPIECE

CHROME-CONTAINING ALUMINIERTE STEEL ALLOYS AND PROCEDURES FOR YOUR PRODUCTION

PROCEDURE FOR FIRING ALSO BATH ALUMINUM OF A STEEL STRIP, CONTAINING AT LEAST 0.1 MANGANESE, IN PARTICULAR STAINLESS AND/OR ALLOYAGE STEEL

PROCEDURE FOR THE ACTIVATION OF TITANIUM SURFACES.

ENDOPROSTHESIS WITH GALVANIC SILVER LAYER

PROCEDURE FOR HOT-DIP GALVANIZING IRON MATERIAL

PROCEDURE FOR THE PRODUCTION OF AN BAND-SHAPED METALLIC COMPOSITE MATERIAL BY HIGH TEMPERATURE DIPPING COATING

PROCEDURE FOR MANUFACTURING COLD-ROLLED ONE METALLIZED STEEL PRODUCTS WITH LOW ONE APPARENT YIELDING POINT TENSILE STRENGTH, AND THEREBY RECEIVED PRODUCTS

DEVICE FOR HOT DIPPING

COATING PROCESS FOR LIGHT ALLOY ALLOY SURFACES

METHOD OF TREATING A FERROUS COMPONENT FOR SUBSEQUENT METALLURGICAL BONDING TO CAST ALUMINUM

Functional ceramic layers based on a support layer produced with crystalline nanoparticles

Dual phase steel strip suitable for galvanizing

Metal-coated steel strip

A steel strip having a coating of an aluminium-zinc-silicon alloy on at least one surface of the strip is disclosed. The strip is characterised in that the aluminium-zinc-silicon alloy contains less than 1.2 wt.% silicon and also contains magnesium. A method of forming a coating of an aluminium-zinc-silicon alloy on a steel strip is also disclosed. The method includes moving steel strip upwardly through a coating pot containing a bath of an aluminium-zinc-silicon alloy and having an opening in a bottom wall of the pot and forming a coating of the alloy on the strip. The method is characterized by minimizing residence time of steel strip in contact with the aluminium-zinc-silicon alloy bath in the pot.

Process for coating a hot- or cold-rolled steel strip containing 6 - 30% by weight of Mn with a metallic protective layer

Process for applying a metallic coating, an intermediate coated product, and a finish coated product

Method of treating sheet metal before galvanisation

Method and installation for hot dip galvanizing hot rolled steel strip

A CORROSION-RESISTANT WELDABLE AND PRESS-WORKABLE HOT DIPPED GALVANNEALED STEEL SHEET

A process for producing tin-coated bands or sheets of copper or a copper alloy

Plated steel product, plated steel sheet and precoated steel sheet having excellent resistance to corrosion

METHOD AND APPARATUS FOR HOT-DIPPING STEEL STRIP

FLUORINATED TERTIARY AMINO ETHERS AND THEIR PREPARATION

HOT ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

A hot rolled steel sheet, which has a chemical composition, in mass %, that C: 0.01 to 0.2 %, Si: 0.01 to 2 %, Mn: 0.1 to 2 %, P: 0.1 % or less, S: 0.03 % or less, Al: 0.001 to 0.1 %, N: 0.01 % or less, and the balance; Fe and inevitable impurities, has a microstructure being composed mainly of a uniform continuous cooling transformation structure and having an average grain diameter of greater than 8 .mu.m and 30 .mu.m or less; and a method for producing the hot rolled steel sheet which comprises a step of subjecting a steel billet having the above composition to rough rolling, to make a rough bar, a step of subjecting the rough bar to a finish rolling under a condition involving an ending temperature of (the Ar3 transformation temperature thereof + 50~C) or higher, to prepare a rolled material, and a step comprising starting to cool the rolled material at the Ar3 transformation temperature thereof or higher after the elapse of 0.5 sec or more from the end of the finish rolling, cooling ...

PRETREATMENT OF PORTION OF FERROUS METAL STRIP WITH PHOSPHORIC ACID SOLUTION TO PREVENT SUBSEQUENT ANIZATION THEREON

METHOD AND INSTALLATION FOR HOT DIP GALVANIZING HOT ROLLED STEEL STRIP

The invention relates to a method for hot dip galvanizing hot rolled steel strip and to a hot rolled strip galvanizing installation. In a first method step, the strip (50) to be galvanized is introduced into a pickling station (10) inside of which the layer of scale as well as reaction products are removed from the surface of the strip. In a subsequent working step, the strip (50) is introduced into a rinsing station (20) in which residual pickle and pickle products are removed from the surface of the strip. Afterwards, the strip (50) is introduced into a drying station (30) and dried therein. From there, the strip (50) is introduced, in another method step, into a furnace (40) in which it is heated, under a protective gas atmosphere, up to a galvanizing temperature. In a final method step, the strip is guided through a galvanizing bath in which it is coated with a hot dip galvanizing layer. This method is improved in such a way that the strip (50) is heated in the furnace (40) to a temperature ...

HOT DIP GALVANIZED STEEL PLATE EXCELLENT IN BALANCE OF STRENGTH AND DUCTILITY AND IN ADHESIVENESS BETWEEN STEEL AND PLATING LAYER

A hot dip galvanized steel plate excellent both in the balance of strength and in adhesiveness between steel and a plating layer, characterized in that the base steel thereof has an average composition: C: 0.05 to 0.25 mass %, Si: 2.0 mass % or less, Mn: 1.0 to 2.5 mass % and Al: 0.005 to 0.10 mass %, provided that the surface part of the base steel just below the plating layer has a C concentration of 0.02 mass % or less, and the structure of the base steel comprises martensite phase in a proportion of 50 % or more in the sum of tempered martensite phase and fine martensite phase, the balance comprising ferrite phase and retained austenite.

METHOD AND SYSTEM FOR MANUFACTURING METAL-PLATED STEEL PIPE

Disclosed are a system capable of adjusting a dipping time easily in a continuous steel pipe manufacturing line, and a manufacturing method. The steel pipe manufacturing system manufactures a steel pipe which has been plated on the inner and outer faces or one face thereof with a molten metal, from a strip steel by the continuous manufacturing line. The steel pipe manufacturing system comprises an inner-face plating section for subjecting the upper side of the strip steel on the side, which is equivalent to the inner face of the steel pipe, to the molten-metal plating treatment by pouring the molten metal, a steel-pipe forming section for cold-forming the inner-face-plated strip steel continuously into a tubular shape and seam-welding the joined longitudinal end faces of the strip steel formed into the steel pipe, to thereby acquire a continuous steel pipe, and an outer-face plating section for plating the steel-pipe outer face with the molten metal by dipping same in the molten metal.

HIGH-STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY, WELDABILITY, AND FATIQUE PROPERTIES AND METHOD FOR MANUFACTURING THE SAME

Disclosed are: a high-strength hot-dip zinc-coated steel sheet having tensile strength of 980 MPa or more and excellent workability, weldability and fatigue properties; and a process for producing the steel sheet. The steel sheet comprises not less than 0.05 mass% and less than 0.12 mass% of C, not less than 0.35 mass% and less than 0.80 mass% of Si, 2.0 to 3.5 mass% of Mn, 0.001 to 0.040 mass% of P, 0.0001 to 0.0050 mass% of S, 0.005 to 0.1 mass% of Al, 0.0001 to 0.0060 mass% of N, 0.01 to 0.5 mass% of Cr, 0.010 to 0.080 mass% of Ti, 0.010 to 0.080 mass% of Nb and 0.0001 to 0.0030 mass% of B, and optionally comprises at least one component selected from 0.01 to 0.15 mass% of Mo, 0.0001 to 0.0050 mass% of Ca, 0.0001 to 0.1 mass% of REM and 0.0001 to 0.1 mass% of Sb, with the remainder being Fe and unavoidable impurities. The steel sheet has a structure composed of a ferrite phase having a volume fraction of 20 to 70% and an average crystal particle diameter of 5 µm or less, and also has ...

METHOD OF TREATING STRIP SURFACES FOR METALLIC COATING

A method of preparing the surfaces of steel strip and sheet stock for fluxless hot dip metallic coating, comprising the steps of passing the stock through a first heating section, continuing the heating of the stock in a second heating section, the atmosphere in the first and second heating sections being isolated from one another, increasing the radiant energy absorptivity of the stock throughout the heating sections, and cooling the stock approximately to the temperature of the molten coating metal. The radiant energy absorptivity is increased by forming a visible iron oxide-containing layer or an ironoxysulfide layer on the stock surfaces in the first heating section and preserving the oxide layer throughout the second heating section.

CONTINUOUS HOT DIP ALUMINUM COATING METHOD

A continuous hot dip aluminum coating method used in a continuous hot dip aluminum coating line for hot dip aluminum coating on steel in Sendzimir method or nonoxidizing furnace method, said method comprising the covering the surface of the coating bath in the snout of said hot dip coating line by use of an inert gas atmosphere.

Hot dip galvannealed steel sheet and method for producing the same

Exemplary embodiments of the present invention can provide a hot dip galvannealed steel sheet which has excellent corrosion resistance, workability, coatability and appearance. The exemplary galvannealed sheet can include an ultra-low carbon steel sheet having a plating layer which includes about 8 to 13% Fe, about 0.05 to 1.0% Ni, about 0.15 to 1.5% Al, and a balance of Zn and unavoidable impurities. An exemplary method for producing a hot dip galvannealed steel sheet is also provided which can include cleaning an annealed ultra-low carbon steel sheet, preplating it with Ni, rapidly heating the sheet in a nonoxidizing or reducing atmosphere, plating the sheet in a galvanization bath containing Al, wiping it, then rapidly reheating it and either cooling the sheet without any soaking time or soaking and holding it for less than 15 seconds and then cooling it.

METHOD FOR MANUFACTURING HIGH STRENGTH STEEL SHEET

A method for manufacturing a high strength steel sheet includes heating a steel sheet containing at least 0.10 mass % of carbon to either a temperature in an austenite single phase region or a temperature in an (austenite+ferrite) two-phase region; cooling the steel sheet to a cooling stop temperature as a target temperature set within a cooling temperature region ranging from Ms to (Ms−150° C.) to allow a portion of non-transformed austenite to proceed to martensitic transformation; retaining a coldest part in a sheet widthwise direction of the steel sheet at a temperature in a temperature range from the cooling stop temperature as the target temperature to (the cooling stop temperature+15° C.) for 15 seconds to 100 seconds; and heating the sheet to a temperature to temper said martensite, wherein “Ms” represents martensitic transformation start temperature and said cooling temperature region is exclusive of Ms and inclusive of (Ms−150° C.). 1. A method for manufacturing a high strength steel sheet comprising:heating a steel sheet containing at least 0.10 mass % of carbon to either a temperature in an austenite single phase region or a temperature in an (austenite+ferrite) two-phase region;cooling the steel sheet to a cooling stop temperature as a target temperature set within a cooling temperature region ranging from Ms to (Ms−150° C.) to allow a portion of non-transformed austenite to proceed to martensitic transformation;retaining a coldest part in a sheet widthwise direction of the steel sheet at a temperature in a temperature range from the cooling stop temperature as the target temperature to (the cooling stop temperature+15° C.) for 15 seconds to 100 seconds; andheating the sheet to a temperature to temper said martensite,wherein “Ms” represents martensitic transformation start temperature and said cooling temperature region is exclusive of Ms and inclusive of (Ms−150° C.).2. The method of claim 1 , further comprising subjecting the steel sheet to a hot dip ...

Metal pipe for vehicle piping and method of surface-treating the same

Disclosed is a metal pipe which is for vehicle piping and which exhibits high corrosion resistance without the corrosion resistance being strengthened by means of a coating or a resin coating-layer, due to a hot-dip plating coating-layer being formed by applying a hot-dip plating to the pipe. The disclosed metal pipe for vehicle piping has a plating coating-layer formed on the surface of a formed metal pipe, said plating coating-layer being formed by means of hot-dip plating on the surface of the metal pipe, and the plating coating-layer being formed from a hot-dip plating alloy comprising at least 3 weight % Al, 1-15 weight % Mg, and Zn and unavoidable impurities as the remainder.

Hot Dip Plated Steel Sheet Having Excellent Plating Adhesiveness and Method of Manufacturing the Same

Provided is a hot dip plated steel sheet used in automotive materials and a method of manufacturing the same, and more particularly, to a hot dip plated steel sheet having excellent platability and plating adhesiveness in which a steel sheet containing alloying elements forming oxides on a surface of the steel sheet at high temperatures is used as an underlying steel sheet, and a method of manufacturing the same. According to the present invention, a hot dip plated steel sheet having excellent platability and plating adhesiveness is provided, in which a steel sheet containing alloying elements forming oxides on a surface of the steel sheet at high temperatures is used as an underlying steel sheet, and thus, limitations in added amounts of silicon (Si), manganese (Mn), or aluminum (Al) may be mitigated. Therefore, development of new steels may be accelerated. 1. A hot dip plated steel sheet having excellent plating adhesiveness comprising:a steel sheet containing alloying elements forming oxides on a surface of the steel sheet at high temperatures as an underlying steel sheet; anda plating material plated on the underlying steel sheet,wherein a discontinuous reduced iron (Fe) layer and a Fe-plating material alloy phase are formed at an interface of the underlying steel sheet and a plating layer.2. The hot dip plated steel sheet having excellent plating adhesiveness of claim 1 , wherein the underlying steel sheet comprises one or more alloying elements of silicon (Si) claim 1 , manganese (Mn) claim 1 , and aluminum (Al).3. The hot dip plated steel sheet having excellent plating adhesiveness of claim 1 , wherein the underlying steel sheet is any one of a dual phase (DP) steel claim 1 , a transformation induced plasticity (TRIP) steel claim 1 , a complex phase (CP) steel claim 1 , a martensitic (MART) steel; and a twinning induced plasticity (TWIP) steel.4. The hot dip plated steel sheet having excellent plating adhesiveness of claim 1 , wherein the plating material ...

HIGH TENSILE STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Described are a high tensile strength galvanized steel sheet with high strength and excellent formability (elongation and stretch-flange ability), and manufacturing method. Tensile strength ≧980 MPa and excellent formability, having (i) defined composition ranges for C, Si, Mn, P, S, N, Al, Ti, V, Solute V, Solute Ti, and Fe and incidental impurities, (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter <10 nm, and volume ratio with respect to the entire microstructure ≧0.007, and (iii) matrix as ferrite phase having area ratio with respect to the entire microstructure ≧97%; and hot-dip galvanized/galvannealed coating on a surface of the hot rolled steel sheet. Contents of C, Ti, V, S, N satisfy (1) Ti≧0.10+N/14*48+S/32*48) and (2) 0.8≦(Ti/48+V/51)/(C/12)≦1.2. 1. A high tensile strength galvanized steel sheet having tensile strength of at least 980 MPa and excellent formability , comprising: [ C: 0.07% to 0.13% (inclusive of 0.07% and 0.13%),', 'Si: 0.3% or less,', 'Mn: 0.5% to 2.0% (inclusive of 0.5% and 2.0%),', 'P: 0.025% or less,', 'S: 0.005% or less,', 'N: 0.0060% or less,', {'b': '3', 'Al: 0.06% or less, %p Ti: 0.10% to 0.14% (inclusive of 0.10% and 0.14%),'}, 'V: 0.15% to 0.30% (inclusive of 0.15% and 0.30%),', 'Solute V: 0.04% to 0.1% (inclusive of 0.04% and 0.1%),', 'Solute Ti: 0.05% or less, and remainder as Fe and incidental impurities,, '(i) a composition including by mass %,'}, '(ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter of less than 10 nm, as well as having volume ratio with respect to the entire microstructure of at least 0.007, and', '(iii) matrix as ferrite phase having area ratio with respect to the entire microstructure of at least 97%; and, 'a hot rolled steel sheet having'}hot-dip galvanized coating or galvannealed coating formed on a surface ...

PRODUCTION METHOD OF HOT ROLLED STEEL SHEET AND PRODUCTION METHOD OF HOT-DIP GALVANIZED STEEL SHEET

A method for producing a hot rolled steel sheet includes a slab heating step of heating a steel slab in a slab heating furnace, a step of hot-rolling the heated steel slab in a rough rolling mill to form a strip and a finish rolling mill, and a coiling step of coiling the strip around a coiler. The atmosphere in steps from the slab heating step to the coiling step is a non-oxidizing atmosphere. The slab steel contains C: 0.01-0.15%, Si: 0.1-1.8%, Mn: 1.0-2.7%, Al: 0.01-1.5%, P: 0.005-0.025%, and S: 0.01% or less, by mass. A hot-dip galvanized steel sheet is produced by pickling the hot rolled steel sheet to remove mill scale, or by pickling the sheet and further cold-rolling the sheet, and subsequently by subjecting the resultant to hot-dip galvanizing. 1. A method for producing a hot rolled steel sheet , comprising:heating a steel slab in a slab heating furnace,hot-rolling the heated steel slab in a rough rolling mill and a finish rolling mill to form a strip,andcoiling the strip in a coiler,wherein the steps from heating the steel slab to coiling the strip are performed in a non-oxidizing atmosphere.2. The method for producing a hot rolled steel sheet according to claim 1 ,{'sub': '2', 'wherein the non-oxidizing atmosphere is a Natmosphere.'}3. The method for producing a hot rolled steel sheet according to claim 2 , wherein the non-oxidizing atmosphere is the Natmosphere containing Hin an amount of 1 to 10% by volume claim 2 , and further has a dew point of −40° C. to +20° C.4. The method for producing a hot rolled steel sheet according to claim 1 , wherein the steel slab contains: C claim 1 , 0.01-0.15% claim 1 , Si: 0.1-1.8% claim 1 , Mn: 1.0-2.7% claim 1 , Al: 0.01-1.5% claim 1 , P: 0.005-0.025% claim 1 , and S: 0.01% or less claim 1 , by mass.5. The method for producing a hot rolled steel sheet according to claim 4 , wherein the steel slab further contains at least one element selected from the group consisting of Cr: 0.05-1.0% claim 4 , Mo: 0.05-1.0% claim 4 ...

HIGH-STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND CRASHWORTHINESS AND METHOD FOR MANUFACTURING THE SAME

A high-strength galvanized steel sheet having excellent formability and crashworthiness, including a component composition containing 0.03% to 0.13% C, 1.0% to 2.0% Si, 2.4% to 3.5% Mn, 0.001% to 0.05% P, 0.0001% to 0.01% S, 0.001% to 0.1% Al, 0.0005% to 0.01% N, and 0.0003% to 0.01% B on a mass basis, the remainder being Fe and unavoidable impurities, and a microstructure containing a tempered martensitic phase and a bainitic phase such that the sum of an area fraction of the tempered martensitic phase and an area fraction of the bainitic phase is 30% or more (the area fraction of the martensitic phase is 30% or more in the absence of the bainitic phase), wherein a distance of closest approach of the tempered martensitic phase is 10 μm or less and the contents of C, Mn, and B satisfy (1): 1. A high-strength galvanized steel sheet having excellent formability and crashworthiness , comprising a component composition containing 0.03% to 0.13% C , 1.0% to 2.0% Si , 2.4% to 3.5% Mn , 0.001% to 0.05% P , 0.0001% to 0.01% S , 0.001% to 0.1% Al , 0.0005% to 0.01% N , and 0.0003% to 0.01% B on a mass basis , the remainder being Fe and unavoidable impurities , and a microstructure containing a tempered martensitic phase and a bainitic phase such that the sum of an area fraction of the tempered martensitic phase and an area fraction of the bainitic phase is 30% or more (the area fraction of the martensitic phase is 30% or more in the absence of the bainitic phase) , wherein a distance of closest approach of the tempered martensitic phase is 10 μm or less and the contents of C , Mn , and B satisfy (1):{'br': None, '(% Mn)+1000×(% B)≧35×(% C) \u2003\u2003(1).'}2. The high-strength galvanized steel sheet according to claim 1 , wherein average grain diameter of the tempered martensitic phase is 2.0 μm or more.3. The high-strength galvanized steel sheet according to claim 1 , wherein the component composition further contains at least one selected from the group consisting of 0. ...

Metal-Coated Steel Sheet, Galvannealed Steel Sheet, and Method for Manufacturing Same

Provided is a metal coated steel sheet having a coating layer including a metal having a level of Gibbs free energy equal to that of Fe or above and an oxide thereof. Accordingly, the quality of a plated steel sheet may be improved by preventing the generation of bare spots through inhibition of the formation of Mn oxide, Si oxide, or Al oxide on the surface thereof, and simultaneously, the complexity of a manufacturing facility or an increase in manufacturing costs may be minimized. Economic benefits are thus realized.

HOT-DIP Al-Zn COATED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME (AS AMENDED)

There is provided a hot-dip Al—Zn coated steel sheet that has a steel sheet containing Si and Mn as a base steel sheet and has excellent coating appearance and corrosion resistance. The Al—Zn coating layer has an Al content in the range of 20% to 95% by mass. The Al—Zn coating layer has a Ca content in the range of 0.01% to 10% by mass. Alternatively, the Ca and Mg content is in the range of 0.01% to 10% by mass. A steel sheet surface layer within 100 μm from a surface of the base steel sheet directly under the Al—Zn coating layer contains less than 0.060 g/mper surface of an oxide of at least one selected from Fe, Si, Mn, Al, P, B, Nb, Ti, Cr, Mo, Cu, and Ni in total. 1. A hot-dip Al—Zn coated steel sheet that includes an Al—Zn coating layer having an Al content in the range of 20% to 95% by mass on a surface of the steel sheet , wherein the Al—Zn coating layer contains 0.01% to 10% by mass of Ca , and a steel sheet surface layer within 100 μm from a surface of a base steel sheet directly under the Al—Zn coating layer contains less than 0.060 g/mper surface of an oxide of at least one selected from Fe , Si , Mn , Al , P , B , Nb , Ti , Cr , Mo , Cu , and Ni in total.2. A hot-dip Al—Zn coated steel sheet that includes an Al—Zn coating layer having an Al content in the range of 20% to 95% by mass on a surface of the steel sheet , wherein the Al—Zn coating layer contains 0.01% to 10% by mass of Ca and Mg in total , and a steel sheet surface layer within 100 μm from a surface of a base steel sheet directly under the Al—Zn coating layer contains less than 0.060 g/mper surface of an oxide of at least one selected from Fe , Si , Mn , Al , P , B , Nb , Ti , Cr , Mo , Cu , and Ni in total.3. The hot dip Al—Zn coated steel sheet according to claim 1 , wherein the ratio Ca/Zn of the Ca content to the Zn content in the Al—Zn coating layer is 0.50 or less.4. The hot-dip Al—Zn coated steel sheet according to claim 1 , wherein the Al—Zn coating layer contains more than 2.00% by ...

CONTINUOUS ANNEALING METHOD AND A MANUFACTURING METHOD OF HOT-DIP GALVANIZED STEEL STRIPS

An annealing and manufacturing method of hot-dip galvanized steel strips includes suppression of oxide formation of elements in the steel strips. An annealing furnace includes a heating zone, a soaking zone, and a cooling zone in which a portion of gas is introduced to decrease the gas dew point. A gas suction rate Qo in a portion of the cooling zone, a gas suction rate Qo in an upper portion and a gas feed rate Qi in a lower portion of the soaking zone, a gas feed rate Qi in a connection part between the soaking and cooling zones, an atmosphere gas supply rate Qf into the cooling zone and its subsequent zone, an atmosphere gas supply rate Qf into the soaking zone, an internal volume Vs of the soaking zone, and an average furnace temperature Ts of the soaking zone satisfy relationships including 0.3×QfQo', '×Qf, '11−0.81\u2003\u2003(3)'}, {'br': None, ' ...

PROCESS FOR THE SURFACE MODIFICATION OF A POLYMER PARTICLE

A process for the preparation of an activated polymer particle comprising contacting a polymer particle with at least one polyamine, wherein said polyamine has three or more amino groups, to form a surface treated polymer particle; and applying a catalyst to the surface treated polymer particle to form an activated polymer particle. 1. A process for the preparation of an activated polymer particle comprising contacting a polymer particle with at least one polyamine , wherein said polyamine has three or more amino groups , to form a surface treated polymer particle; andapplying a catalyst to the surface treated polymer particle to form an activated polymer particle.2. The process of claim 1 , further comprising applying at least one metal coating to said activated polymer particle to form a metal coated polymer particle.3. The process of claim 2 , wherein said metal coating is applied using a plating bath comprising ammonia and metal ions wherein the molar ratio of 1:1.5 to 1:5 in molar ratio of metal ions to ammonia.4. The process of claim 3 , wherein said metal ions are nickel ions.5. The process of claim 1 , wherein the polyamine is a linear polyamine or a branched polyamine claim 1 , said linear or branched polyamine having 3 to 10 amino groups.6. The process of claim 1 , wherein the catalyst is Pd claim 1 , Pt or Sn or mixtures thereof.7. The process of claim 2 , wherein said metal coating layer is deposited by at least one of electroless plating or electroplating.8. The process of claim 2 , wherein said metal coating layer comprises Ni claim 2 , Cu or Ag.9. The process of wherein said polymer particle is cross-linked.10. The process of claim 1 , wherein said polymer particle comprises an acrylate polymer or a styrenic polymer.11. The process of claim 1 , wherein said polymer particle comprises a phenol/aldehyde polymer or an epoxy functional polymer.12. The process of claim 1 , wherein said polymer particle does not contain a polyester.13. The process of claim ...

HIGH STRENGTH GALVANIZED STEEL SHEET EXHIBITING EXCELLENT FATIGUE PROPERTY AND METHOD FOR MANUFACTURING THE SAME

A high strength galvanized steel sheet having tensile strength of 590 MPa or more which is excellent in fatigue property in punching work, and a manufacturing method thereof are provided. The microstructure includes a ferrite phase having an average grain diameter of 15 μm or less and an area fraction of 60% or more and a martensite phase having an area fraction of 5 to 40%, and an amount of one or more kinds of oxide selected from a group consisting of Fe, Si, Mn, Al, P, Nb, and Ti generated on a surface layer portion of the steel sheet within 100 μm in a steel-sheet-side depth direction from a surface of a base steel sheet directly below a galvanized layer is less than 0.060 g/mper one-side surface of the steel sheet. 1. A high strength galvanized steel sheet exhibiting excellent fatigue property , the steel sheet having a composition containing by mass % 0.03 to 0.15% C , 2.00% or less Si , 1.0 to 2.5% Mn , 0.050% or less P , 0.0100% or less S , 0.050% or less Al , 0.0050% or less N , 0.010 to 0.100% Ti , 0.010 to 0.100% Nb , 0.0010 to 0.0100% Sb , and Fe and unavoidable impurities as a balance , whereinthe microstructure includes a ferrite phase having an average grain diameter of 15 μm or less and an area fraction of 60% or more and a martensite phase having an area fraction of 5 to 40%, and{'sup': '2', 'an amount of one or more kinds of oxide selected from a group consisting of Fe, Si, Mn, Al, P, Nb and Ti generated in a surface layer portion of the steel sheet within a range from a surface of a base steel sheet directly below a galvanized layer to 100 μm away from the surface in a direction of steel-sheet-side depth is less than 0.060 g/mper one-side surface of the steel sheet.'}2. The high strength galvanized steel sheet exhibiting excellent fatigue property according to claim 1 , wherein the composition further contains by mass % one or more kinds of elements selected from a group consisting of 0.05 to 0.80% Cr claim 1 , 0.01 to 0.10% V claim 1 , 0.01 to 0. ...

METHOD FOR MANUFACTURING HOT STAMPED BODY AND HOT STAMPED BODY

The present invention provides a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac° C. and lower than Ac° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.

HIGH STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT DEEP DRAWABILITY AND STRETCH FLANGEABILITY AND METHOD FOR MANUFACTURING THE SAME

A high-strength galvanized steel sheet contains C: 0.010% or more and 0.06% or less, Si: more than 0.5% and 1.5% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.1% or less, S: 0.01% or less, sol.Al: 0.005% or more and 0.5% or less, N: 0.01% or less, Nb: 0.010% or more and 0.090% or less, and Ti: 0.015% or more and 0.15% or less, on a mass percent basis. The Nb and C contents of the steel satisfy the relation of (Nb/93)/(C/12)<0.20. C* satisfies 0.005≦C*≦0.025. Ferrite constitutes 70% by area ratio or more of the steel sheet. Martensite constitutes 3% by area ratio or more of the steel sheet. C*=C−(12/93)Nb−(12/48){Ti−(48/14)N}, wherein C, Nb, Ti, and N denote the C, Nb, Ti, and N contents of the steel. 1. A high-strength galvanized steel sheet having excellent deep drawability and stretch flangeability , comprising: on a mass percent basis , C: 0.010% or more and 0.06% or less , Si: more than 0.5% and 1.5% or less , Mn: 1.0% or more and 3.0% or less , P: 0.005% or more and 0.1% or less , S: 0.01% or less , sol.Al: 0.005% or more and 0.5% or less , N , 0.01% or less , Nb: 0.010% or more and 0.090% or less , and Ti: 0.015% or more and 0.15% or less , the Nb and C contents (% by mass) of the steel satisfying the relation of (Nb/93)/(C/12)<0.20 , C* given by the following formula (1) satisfying 0.005≦C*≦0.025 , and the remainder being Fe and incidental impurities , wherein ferrite constitutes 70% by area ratio or more , martensite constitutes 3% by area ratio or more , the average r-value (Lankford value) is 1.2 or more , and the hole expansion ratio (λ) is 80% or more:{'br': None, 'C*=C−(12/93)Nb−(12/48){Ti−(48/14)N}\u2003\u2003(1)'}wherein C, Nb, Ti, and N denote the C, Nb, Ti, and N contents (% by mass) of the steel, respectively, provided that if Ti−(48/14)N≦0, then Ti−(48/14)N=0.2. The high-strength galvanized steel sheet having excellent deep drawability and stretch flangeabiity according to claim 1 , further comprising: on a mass percent basis ...

HIGH STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT UNIFORM ELONGATION AND ZINC COATABILITY AND METHOD FOR MANUFACTURING THE SAME

A high strength galvanized steel sheet is provided comprising steel containing C: 0.06% or more and 0.20% or less, Si: less than 0.50%, Mn: 0.5% or more and less than 2.0%, P: 0.05% or less, S: 0.02% or less, Al: 0.60% or more and 2.00% or less, N: less than 0.004%, Cr: 0.10% or more and 0.40% or less and B: 0.003% or less, satisfying the relationships 0.8≦Mn≦2.0 and Mn+1.3[% Al]≧2.8, and a microstructure containing a ferrite phase and a second phase whose volume fraction is 15% or less, the second phase having a martensite phase whose volume fraction is 3% or more, a retained austenite phase whose volume fraction is 3% or more and a sum of the volume fractions of a pearlite phase and a bainite phase being equal to or less than the volume fraction of the martensite phase and the volume fraction of the retained austenite phase. 1. A high strength galvanized steel sheet having excellent uniform elongation and zinc coatability , which comprises steel having a chemical composition containing , by mass % , C: 0.06% or more and 0.20% or less , Si: less than 0.50% , Mn: 0.5% or more and less than 2.0% , P: 0.05% or less , S: 0.02% or less , Al: 0.60% or more and 2.00% or less , N: less than 0.004% , Cr: 0.10% or more and 0.40% or less , B: 0.003% or less (including 0%) and the balance being Fe and inevitable impurities , where Mndefined below satisfies the relationships 0.8≦Mn≦2.0 and Mn+1.3[% Al]≧2.8 , and having a microstructure containing a ferrite phase as a parent phase and a second phase whose volume fraction is 15% or less , the second phase having a martensite phase whose volume fraction is 3% or more , a retained austenite phase whose volume fraction is 3% or more and a sum of the volume fractions of a pearlite phase and a bainite phase which is equal to or less than the volume fraction of the martensite phase and the volume fraction of the retained austenite phase , and a galvanizing layer on the surface of the steel sheet , {'br': None, 'sub': 'eq', 'Mn=[%Mn]+1. ...

Zn-Al-Mg BASED ALLOY HOT-DIP PLATED STEEL SHEET, AND METHOD FOR PRODUCING THE SAME

[Problem] To provide a steel sheet hot-dip-plated with a Zn—Al—Mg-based alloy coating, which is remarkably improved in point of all the burring workability, the liquid metal embrittlement cracking resistance and the corrosion resistance in the welded part thereof, as a steel material favorable for arc-welded structural members. 3. The plated steel sheet for use in forming automobile underbody members having a Zn—Al—Mg-based alloy layer formed by hot-dipping according to claim 1 , wherein the base steel sheet further contains claim 1 , in terms of % by mass claim 1 , at least one of Nb of at most 0.10% and V of at most 0.10%.5. The Zn—Al—Mg-based alloy plated steel sheet according to claim 1 , wherein the composition of the Zn—Al—Mg-based alloy layer formed by hot-dipping on the surface of the base steel sheet comprises claim 1 , in terms of % by mass claim 1 , Al of from 3.0 to 22.0% claim 1 , Mg of from 0.05 to 10.0% claim 1 , Ti of from 0 to 0.10% claim 1 , B of from 0 to 0.05% claim 1 , Si of from 0 to 2.0% claim 1 , Fe of from 0 to 2.0% claim 1 , and a balance of Zn and inevitable impurities.8. The method for producing a plated steel sheet for use in forming automobile underbody members having a Zn—Al—Mg-based alloy layer formed by hot-dipping according to claim 6 , wherein the chemical composition of the base steel sheet further contains claim 6 , in terms of % by mass claim 6 , at least one of Nb of at most 0.10% and V of at most 0.10%.10. The method for producing a Zn—Al—Mg-based alloy plated steel sheet according to claim 6 , wherein the composition of the Zn—Al—Mg-based alloy layer formed by hot-dipping on the surface of the base steel sheet comprises claim 6 , in terms of % by mass claim 6 , Al of from 3.0 to 22.0% claim 6 , Mg of from 0.05 to 10.0% claim 6 , Ti of from 0 to 0.10% claim 6 , B of from 0 to 0.05% claim 6 , Si of from 0 to 2.0% claim 6 , Fe of from 0 to 2.0% claim 6 , and a balance of Zn and inevitable impurities. The present invention ...

HOT DIPPED GALVANIZED STEEL SHEET WITH EXCELLENT DEEP DRAWING PROPERTIES AND ULTRA-LOW TEMPERATURE ADHESIVE BRITTLENESS, AND PREPARATION METHOD THEREOF

Provided is a hot dipped galvanized steel sheet with excellent deep drawing properties and ultra-low temperature adhesive brittleness, wherein the average diameter of crystal particles of a hot-dip galvanizing layer is 150-400 μm, and the degree of the preferred orientation with respect to the (0001) face of the hot-dip galvanizing layer is 3,000-20,000 cps (counter per second), and a preparation method thereof. 1. A hot-dipped galvanized steel sheet with improved deep drawing properties and low-temperature adhesive brittleness , the hot-dipped galvanized steel sheet comprising a zinc plating layer , wherein grains of the zinc plating layer have an average particle diameter of 150 μm to 400 μm , and intensity of preferred orientation of (0001) planes of the zinc plating layer is from 3000 cps (count per second) to 20000 cps.2. The hot-dipped galvanized steel sheet of claim 1 , wherein the grains of the zinc plating layer have a diameter of 30 μm or greater and a diameter deviation equal to or less than 40% of the average particle diameter thereof.3. The hot-dipped galvanized steel sheet of claim 1 , wherein the zinc plating layer comprises 30% or more claim 1 , by volume fraction claim 1 , of crystallographic twins.4. A method of manufacturing a hot-dipped galvanized steel sheet claim 1 , the method comprising:applying molten zinc to a steel sheet;adjusting the amount of the molten zinc applied to the steel sheet;spraying an aqueous solution on the steel sheet;cooling the steel sheet; andperforming a skin pass milling process on the steel sheet,wherein the spraying of the aqueous solution comprises spraying electrically charged demi-water (demineralized water) on the steel sheet.5. The method of claim 4 , wherein the spraying of the electrically charged demi-water is performed using a nozzle at a demi-water injection pressure of 0.3 kgf/cmto 5.0 kgf/cmand an air injection pressure of 0.5 kgf/cmto 7.0 kgf/cm.6. The method of claim 5 , wherein the spraying of the ...

Steel Armor Wire Coatings

A wire includes a ferrous core. The ferrous core can be coated. The coatings can include nickel, molybdenum, zinc and Fe. A process of forming a wire can include placing a metal strip alongside a ferrous wire core, bending the strip around the core, and seam welding the strip to form a metal tube around the core. The process of forming a wire can include applying a metal layer to a ferrous metal rod to form a plated rod, placing a metal strip alongside the rod, bending the strip around the rod, and seam welding the strip to form a metal tube around the rod. The process of forming a wire can include coating a ferrous wire core with a layer of nickel, molybdenum or a nickel alloy that circumferentially surrounds the ferrous wire core. 1. A process of forming a wire comprising:coating a ferrous wire core with an interface layer of nickel, molybdenum or a nickel alloy,wherein the interface layer circumferentially surrounds the ferrous wire core; andcoating the interface layer with an outer layer.2. The process of claim 1 , wherein the ferrous wire core is steel.3. The process of claim 1 , wherein the interface layer has a thickness of between 2 and 60 microns.4. The process of claim 1 , wherein outer layer has a thickness of between 1 and 50 microns.5. The process of claim 1 , wherein the outer layer comprises a zinc alloy claim 1 , and wherein the zinc allow comprises:binary Zn—Ni or Zn—Co alloy; orternary Zn—Ni—Co, Zn—Ni—Mo or Zn—Co—Mo alloy.6. The process of claim 1 , further comprising an Fe layer claim 1 , wherein the Fe layer circumferentially surrounds the interface layer and is circumferentially surrounded by the outer layer.7. The process of claim 6 , wherein the Fe layer has a thickness of between 2 and 20 microns.8. The process of claim 1 , further comprising a galvanized zinc coating. The present disclosure relates to steel armor wire strength member coating compositions, structures, and processes.Armor wire strength members used in wireline cables for ...

ZINC ALLOY PLATED STEEL MATERIAL HAVING EXCELLENT WELDABILITY AND PROCESSED-PART CORROSION RESISTANCE AND METHOD OF MANUFACTURING SAME

Zn alloy plated steel material having excellent weldability and processed-part corrosion resistance and a method for production of Zn alloy plated steel material are provided. In the Zn alloy plated steel material comprising base steel material and a Zn alloy plating layer, the Zn alloy plating layer includes, by wt %, Al: 0.1-5.0%, Mg: 0.1-5.0%, as well as a remainder of Zn and inevitable impurities. The Zn alloy plated steel material includes a lower interface layer and an upper interface layer between the base steel material and the Zn alloy plating layer, wherein the lower interface layer is formed on the base steel material and has a dense structure, and the upper interface layer is formed on the lower interface layer and has a network-type or island-type structure. 1. A zinc (Zn) alloy plated steel material , comprising:a base steel and a Zn alloy plating layer, the Zn alloy plating layer including, by wt %, aluminum (Al): 0.1% to 5.0%, magnesium (Mg): 0.1% to 5.0%, Zn as a residual component, and inevitable impurities,wherein between the base steel and the Zn alloy plating layer, a lower interface layer formed on the base steel and having a fine structure and an upper interface layer formed on the lower interface layer and having a network-type structure or an island-type structure are provided.2. The Zn alloy plated steel material of claim 1 , wherein the upper interface layer and the lower interface layer comprise an Fe—Al-based alloy claim 1 , and the Fe—Al-based alloy is provided as one or more type of alloy selected from a group consisting of FeAl claim 1 , FeAland FeAl.3. The Zn alloy plated steel material of claim 1 , wherein an area percentage of the upper interface layer claim 1 , as compared with an area of the lower interface layer claim 1 , is in a range of 10% to 90%.4. The Zn alloy plated steel material of claim 1 , wherein an area percentage of the upper interface layer claim 1 , as compared with an area of the lower interface layer claim 1 , ...

ZINC ALLOY PLATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AFTER BEING PROCESSED AND METHOD FOR MANUFACTURING SAME

Provided is a plated steel material which can be used for an automobile, a household appliance, a building material, and the like and, more particularly, to a zinc alloy plated steel material having excellent corrosion resistance after being processed and a method for manufacturing the same. 1. A zinc alloy plated steel material having excellent corrosion resistance after being processed , comprising:a base steel;a zinc alloy plated layer formed on the base steel; andan inhibition layer formed between the base steel and the zinc alloy plating layer,wherein the zinc alloy plated layer comprises, by wt %, 0.5% to 3.5% of magnesium (Mg), 0.5% to 11.0% of aluminum (Al), 10 ppm to 350 ppm of silicon (Si), a remainder of zinc (Zn) and inevitable impurities, andthe inhibition layer comprises a Si-concentrated layer.2. The steel material of claim 1 , wherein a number of MgSi phases between the base steel and the zinc alloy plating layer claim 1 , having a diameter greater than 1000 nm per 100 μm claim 1 , is 5 or less.3. The steel material of claim 1 , wherein a number of MgSi phases between the base steel and the zinc alloy plating layer claim 1 , having a diameter greater than 500 nm per 100 μm claim 1 , is 5 or less s.4. A method of manufacturing a zinc alloy plated steel material having excellent corrosion resistance after being processed claim 1 , comprising:preparing a hot-rolled steel material having a grain size of 1 μm to 100 μm;cold-rolling the hot-rolled steel material to manufacture a cold-rolled steel material having a surface roughness of 0.2 μm to 1.0 μm and a steepness of 0.2 to 1.2;immersing a base steel, the cold-rolled steel material, into a plating bath comprising, by wt %, 0.5% to 3.5% of magnesium (Mg), 0.5% to 11.0% of aluminum (Al), 10 ppm to 350 ppm of silicon (Si), a remainder of zinc (Zn) and inevitable impurities, to plate; andwiping and cooling the hot-dip zinc alloy plated steel material.5. The method of claim 4 , wherein the plating bath ...

METHOD FOR APPLYING A METAL PROTECTIVE COATING TO A SURFACE OF A STEEL PRODUCT

A method for applying a metallic protective coating to a surface of a steel product, where another surface is to remain free from the metallic protective coating, may involve applying the metallic protective coating by hot dip coating in a hot dip coating bath. A preliminary coating may be applied to the surface that is to remain free from the metallic protective coating prior to the hot dip coating. The preliminary coating may include SiOand may prevent the metallic protective coating from adhering to the intended surface during hot dip coating. Thus one surface of a steel product may be provided with a metallic protective coating, and another surface of the steel product may be kept free from the protective coating, all with a minimum of cost and complexity and with optimized resource economics. Further, the preliminary coating, deposited from a gas phase to that surface of the steel product that is to be kept free from the metallic protective coating, may be a layer that includes amorphous silicon dioxide and has a layer thickness of 0.5-500 nm.” 115-. (canceled)16. A method for applying a metallic protective coating to a first surface of a steel product , wherein a second surface of the steel product is to remain free from the metallic protective coating , the method comprising:applying a preliminary coating comprising SiO2 to the second surface of the steel product, the preliminary coating for preventing the metallic protective coating from adhering to the second surface, wherein the preliminary coating is deposited from a gas phase to the second surface, wherein the preliminary coating applied to the second surface is a layer that comprises amorphous silicon dioxide and has a layer thickness of 0.5-500 nm; andapplying the metallic protective coating by hot dip coating in a hot dip coating bath after the preliminary coating has been applied to the second surface of the steel product.17. The method of comprising depositing the preliminary coating by flame ...

HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME

A high-strength steel sheet includes a steel structure with: ferrite being 35% to 80% and tempered martensite being greater than 5% and 20% or less in terms of area fraction; retained austenite being 8% or more in terms of volume fraction; an average grain size of: the ferrite being 6 μm or less; and the retained austenite being 3 μm or less; a value obtained by dividing an area fraction of blocky austenite by a sum of area fractions of lath-like austenite and the blocky austenite being 0.6 or more; a value obtained by dividing, by mass %, an average Mn content in the retained austenite by an average Mn content in the ferrite being 1.5 or more; and a value obtained by dividing, by mass %, an average C content in the retained austenite by an average C content in the ferrite being 3.0 or more. 18.-. (canceled)9. A high-strength steel sheet comprising:a component composition including: by mass %, C: 0.030% to 0.250%; Si: 0.01% to 3.00%; Mn: 3.10% to 4.20%; P: 0.001% to 0.100%; S: 0.0001% to 0.0200%; N: 0.0005% to 0.0100%; Al: 0.010% to 1.200%; and balance Fe and inevitable impurities; and ferrite being 35% to 80% and tempered martensite being greater than 5% and 20% or less in terms of area fraction;', 'retained austenite being 8% or more in terms of volume fraction;', 'an average grain size of the ferrite being 6 μm or less;', 'an average grain size of the retained austenite being 3 μm or less;', 'a value obtained by dividing an area fraction of blocky austenite by a sum of area fractions of lath-like austenite and the blocky austenite being 0.6 or more;', 'a value obtained by dividing an average Mn content, by mass %, in the retained austenite by an average Mn content, by mass %, in the ferrite being 1.5 or more; and', 'a value obtained by dividing an average C content, by mass %, in the retained austenite by an average C content, by mass %, in the ferrite being 3.0 or more., 'a steel structure with10. The high-strength steel sheet according to claim 9 , wherein the ...

Zinc alloy-plated steel having excellent corrosion resistance and surface smoothness, and manufacturing method therefor

Provided is a plated steel to be used for automobiles, electric home appliances, building materials and the like and, more specifically, to a zinc alloy-plated steel having excellent corrosion resistance and surface smoothness, and a method for manufacturing the same.

CONTINUOUS ANNEALING FURNACE AND CONTINUOUS ANNEALING METHOD FOR STEEL STRIPS

The invention provides a vertical annealing furnace including a heating zone and a soaking zone without any partition wall therebetween. The furnace has furnace-to-refiner gas suction openings disposed in a lower portion of a joint between the soaking zone and a cooling zone and in the heating zone and/or the soaking zone except a region extending 6 m in a vertical direction and 3 m in a furnace length direction both from a steel strip inlet at a lower portion of the heating zone. The furnace has refiner-to-furnace gas ejection openings disposed in a region in the joint between the soaking zone and the cooling zone, the region being located above the pass line in the joint, and in a region in the heating zone located above 2 m below the center of upper hearth rolls in the vertical direction. 1. A continuous annealing furnace for a steel strip comprising a heating zone , a soaking zone and a cooling zone disposed in this order and configured to transport the steel strip in upward and/or downward directions , a joint connecting the soaking zone and the cooling zone being disposed at an upper portion of the furnace , the heating zone and the soaking zone having no partition wall therebetween ,the furnace being a vertical annealing furnace and being configured such that an atmosphere gas is supplied from outside the furnace into the furnace, the gas in the furnace is discharged through a steel strip inlet at a lower portion of the heating zone while part of the gas in the furnace is suctioned and introduced into a refiner equipped with an oxygen removal device and a dehumidifier to lower the dew point by the removal of oxygen and water in the gas, the refiner being disposed outside the furnace, and the gas with the lowered dew point is returned into the furnace,the furnace having furnace-to-refiner gas suction openings disposed in a lower portion of the joint between the soaking zone and the cooling zone and at least one of in the heating zone and the soaking zone, the ...

HIGH STRENGTH HOT DIP GALVANISED COMPLEX PHASE STEEL STRIP

High strength hot dip galvanised complex phase steel strip, in mass percent, of the following elements: 0.13-0.19% C, 1.70-2.50% Mn, max 0.15% Si, 0.40-1.00% Al, 0.05-0.25% Cr, 0.01-0.05% Nb, max 0.10% P, max 0.004% Ca, max 0.05% S, max 0.007% N; and optionally at least one of the following elements: max 0.50% Ti, max 0.40% V, max 0.50% Mo, max 0.50% Ni, max 0.50% Cu, max 0.005% B, the balance being Fe and inevitable impurities; wherein 0.40%1.90%; and having a complex phase microstructure, in volume percent, including 8-12% retained austenite, 20-50% bainite, less than 10% martensite, the remainder being ferrite; method of producing same.

ALLOYED HOT-DIP GALVANIZED STEEL SHEET AND ALLOYED HOT-DIP GALVANIZED STEEL SHEET PRODUCTION METHOD

In one aspect of the present invention, a hot-dip galvannealed steel sheet includes a steel sheet and a hot-dip galvannealed layer on the surface of the steel sheet. The steel sheet has a predetermined composition and has an average oxygen concentration of 0.10 mass % or less in the region of 1 μm from the interface between the steel sheet and the hot-dip galvannealed layer toward the steel sheet. The metal microstructure of the steel sheet at a position of t/4 where t represents the sheet thickness of the hot-dip galvannealed steel sheet includes 50 to 85 area % of martensite, 15 to 50 area % of bainite, and 5 area % or less of ferrite. 1. A hot-dip galvannealed steel sheet comprising:a steel sheet; and a hot-dip galvannealed layer on a surface of the steel sheet, wherein the steel sheet comprises, in mass %,C: 0.10% or more and 0.25% or less,Si: more than 0% and 0.50% or less,Mn: more than 2.0% and 3.5% or less,P: more than 0% and 0.1% or less,S: more than 0% and 0.05% or less,Al: 0.01% or more and 0.10% or less,Ti: more than 0% and 0.1% or less,B: 0.0020% or more and 0.0050% or less,N: more than 0?/ and 0.01% or less,Cr: more than 0% and 0.5% or less, andMo: more than 0% and 0.5% or less,Wherein the steel sheet has an average oxygen concentration of 0.10 mass % or less in a region of 1 μm from an interface between the steel sheet and the hot-dip galvannealed layer toward the steel sheet, andwherein a metal microstructure of the steel sheet at a position of t/4, where t represents a sheet thickness of the hot-dip galvannealed steel sheet, comprises 50 to 85 area % of martensite, 15 to 50 area % of bainite, and 5 area % or less of ferrite.2. A method for manufacturing the hot-dip galvannealed steel sheet of claim 1 , the method comprising:{'b': '1100', 'soaking a steel having a composition of the steel sheet at ° C. to 1300° C., hot-rolling the steel at a finishing temperature of 850° C. to 950° C., and coiling the hot-rolled steel at 630° C. to 680° C., to provide ...

HOT DIP GALVANIZED STEEL SHEET AND HOT DIP GALVANNEALED STEEL SHEET

A hot dip galvanized steel sheet and hot dip galvannealed steel sheet improved in uniform ductility and local ductility, yield strength and tensile strength, and low temperature impact property, characterized by having a predetermined chemical composition, having a metal structure containing, by volume %, retained austenite: over 5.0% and tempered martensite: over 5.0%, having retained austenite containing C: 0.85 mass % or more, and having a ratio [C]/[P]of an amount of segregation of C (number of atoms/nm): [C]to an amount of segregation of P (number of atoms/nm): [P]at prior austenite grain boundaries of 4.0 or more. 1. A hot dip galvanized steel sheet having a hot dip galvanized layer on the surface ,a chemical composition of the steel sheet comprising, by mass %,C: 0.03 to 0.70%,Si: 0.25 to 2.50%,Mn: 1.00 to 5.00%,P: 0.0005 to 0.100%,S: 0.010% or less,sol. Al: 0.001 to 2.500%,N: 0.020% or less,B: 0 to 0.0200%,Ti: 0 to 0.30%,Nb: 0 to 0.30%,V: 0 to 0.30%,Cr: 0 to 2.00%,Mo: 0 to 2.00%,Cu: 0 to 2.00%,Ni: 0 to 2.00%,Ca: 0 to 0.010%,Mg: 0 to 0.010%,REM: 0 to 0.10%,Bi: 0 to 0.050% anda balance of Fe and unavoidable impurities,a metal structure of the steel sheet comprising, by volume %, retained austenite: over 5.0% and tempered martensite: over 5.0% and the retained austenite contains C: 0.85 mass % or more, and{'sub': γgb', 'γgb', 'γgb', 'γgb, 'sup': 2', '2, 'a ratio [C]/[P]of an amount of segregation of C (number of atoms/nm): [C]to an amount of segregation of P (number of atoms/nm): [P]at prior austenite grain boundaries in the metal structure of the steel sheet being 4.0 or more.'}2. The hot dip galvanized steel sheet according to claim 1 , whereina chemical composition of the steel sheet comprises, by mass %, at least one ofB: 0.0002 to 0.0200%,Ti: 0.001 to 0.30%,Nb: 0.001 to 0.30%,V: 0.001 to 0.30%,Cr: 0.001 to 2.00%,Mo: 0.001 to 2.00%,Cu: 0.001 to 2.00%,Ni: 0.001 to 2.00%,Ca: 0.0001 to 0.010%,Mg: 0.0001 to 0.010%,REM: 0.0001 to 0.10%, andBi: 0.0001 to 0.050%.3 ...

HIGH-STRENGTH GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME (AS AMENDED)

A high-strength galvanized steel sheet having a chemical composition containing, by mass %, C: 0.07% to 0.25%, Si: 0.01% to 3.00%, Mn: 1.5% to 4.0%, P: 0.100% or less, S: 0.02% or less, Al: 0.01% to 1.50%, N: 0.001% to 0.008%, Ti: 0.003% to 0.200%, B: 0.0003% to 0.0050%, and the balance being Fe and inevitable impurities, in which the relationship Ti>4N is satisfied, and a microstructure including, in terms of area ratio in a cross section located at ¼ of the thickness from the surface of a base steel sheet, a ferrite phase in an amount of 70% or less (including 0%), a bainite phase and a tempered bainite phase in an amount of 20% or less (including 0%) in total, a tempered martensite phase in an amount of 25% or more, and a retained austenite phase in an amount of less than 3% (including 0%), in which the average crystal grain diameter of the tempered martensite phase is 20 μm or less, in which a variation in the Vickers hardness of the tempered martensite phase is 20 or less in terms of standard deviation, and in which the number density of carbides having a minor axis length of 0.05 μm or more in the tempered martensite phase is 3×10particles/mmor less, as well as a method for manufacturing the steel sheet, is disclosed. 16.-. (canceled)8. The high-strength claim 7 , galvanized steel sheet according to claim 7 , the chemical composition further containing claim 7 , by mass % claim 7 , at least one group selected from the group consisting of Group A to C: Cr: 0.01% to 2.00%,', 'Mo: 0.01% to 2.00%,', 'V: 0.01% to 2.00%,', 'Ni: 0.01% to 2.00%, and', 'Cu: 0.01% to 2.00%, 'Group A, which contains at least one selected from 'Nb: 0.003% to 0.200%, and', 'Group B, which contains Ca: 0.001% to 0.005%, and', 'REM: 0.001% to 0.005%., 'Group C, which contains at least one selected from9. A method for manufacturing a high-strength claim 7 , galvanized steel sheet claim 7 , the method comprising performing the following processes in the following order:{'claim-ref': {'@idref': ...

STEEL SHEET FOR HOT PRESS-FORMING, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR PRODUCING HOT PRESS-FORMED PARTS USING THE SAME

The invention provides a steel sheet for hot press-forming that can reliably give hot press-formed parts having excellent paint adhesiveness, perforation corrosion resistance and joint corrosion resistance, and also provides a method for manufacturing the steel sheet for hot press-forming, and a method for producing hot press-formed parts using the steel sheet for hot press-forming. The steel sheet for hot press-forming includes a base steel sheet and a Zn-based coating layer with a mass of coating of 10 to 90 g/mon the base steel sheet, wherein the average ferrite grain diameter in the surface microstructure of the base steel sheet is not more than 20 μm. 1. A steel sheet for hot press-forming comprising a base steel sheet and a Zn-based coating layer with a mass of coating of 10 to 90 g/mon the base steel sheet , wherein the average ferrite grain diameter in the surface microstructure of the base steel sheet is not more than 20 μm.2. The steel sheet for hot press-forming according to claim 1 , wherein the Zn-based coating layer has a chemical composition comprising 10 to 25 mass % Ni and the balance being Zn and inevitable impurities.3. The steel sheet for hot press-forming according to claim 2 , wherein the Zn-based coating layer includes an η phase in an amount of not more than 5 mass %.4. The steel sheet for hot press-forming according to claim 1 , wherein the base steel sheet under the Zn-based coating layer has a chemical composition comprising claim 1 , by mass % claim 1 , C: 0.15 to 0.5% claim 1 , Si: 0.05 to 2.0% claim 1 , Mn: 0.5 to 3% claim 1 , P: not more than 0.1% claim 1 , 5: not more than 0.05% claim 1 , Al: not more than 0.1% claim 1 , N: not more than 0.01% claim 1 , and the balance being Fe and inevitable impurities.5. The steel sheet for hot press-forming according to claim 4 , wherein the base steel sheet under the Zn-based coating layer further includes claim 4 , by mass % claim 4 , at least one selected from Cr: 0.01 to 1% claim 4 , Ti: not ...

Process for Producing a ZnAlMg-Coated Metal Sheet with Optimized Wiping and Corresponding Metal Sheet

In this method, 21. A method according to claim 1 , wherein the method includes claim 1 , prior to the coating deposition step claim 1 , a step of cold rolling of the sheet ().31. A method according to one of the preceding claims claim 1 , wherein the method includes claim 1 , after the step of coating solidification claim 1 , a step of skin-pass rolling of the sheet ().47. A method according to one of the preceding claims claim 1 , wherein the content by weight of Al in the metal coating () is comprised between 0.5% and 3.9%.57. A method according to claim 4 , wherein the content by weight of Al in the metal coating () is comprised between 1.5% and 3.9%.67. A method according to one of to claim 4 , wherein the content by weight of Al in the metal coating () is comprised between 4.4% and 5.6%.77. A method according to one of the preceding claims claim 4 , wherein the content by weight of Mg in the metal coating () is comprised between 1.0% and 3.3%.87. A method according to claim 7 , wherein the content by weight of Mg in the metal coating () is comprised between 2.5% and 3.3%.97. A method according to one of to claim 7 , wherein the content by weight of Mg in the metal coating () is comprised between 0.3% and 1.5%.1011357777. A sheet () obtainable according to the method claimed in one of preceding claims claim 7 , the sheet () comprising a substrate () made of steel whereof at least one surface () is coated with a metal coating () comprising of Al and Mg claim 7 , with the remainder of the metal coating () consisting of Zn claim 7 , inevitable impurities and possibly one or more additional elements selected from among Si claim 7 , Sb claim 7 , Pb claim 7 , Ti claim 7 , Ca claim 7 , Mn claim 7 , Sn claim 7 , La claim 7 , Ce claim 7 , Cr claim 7 , Zr or Bi claim 7 , the content by weight of each additional element in the metal coating () being less than 0.3% claim 7 , the metal coating () having a content by weight of Al comprised between 0.5% and 8% and a content ...

METHOD FOR MANUFACTURING GALVANIZED STEEL SHEET FOR HOT STAMPING, HOT-DIP GALVANNEALED STEEL SHEET FOR HOT STAMPING AND METHOD FOR MANUFACTURING SAME, AND HOT STAMPED COMPONENT

Provided is a method for producing a plated steel sheet with high Si content for hot stamping, which is capable of suppressing the generation of unplated portions, while maintaining high bonding strength in a welded part in cases where a galvanized steel sheet containing a large amount of Si, namely, 0.7% or more of Si is used for hot stamping applications. In this production method, a hot-rolled pickled steel sheet or cold-rolled steel sheet containing 0.10-0.5% by mass of C, 0.7-2.5% by mass of Si, 1.0-3% by mass of Mn, and 0.01-0.5% by mass of Al is annealed in a reducing atmosphere and then plated, thereby producing a galvanized steel sheet for hot stamping. This method for producing a galvanized steel sheet for hot stamping is characterized in that the annealing is carried out within the range of 500 to 700° C. for 30 to 270 seconds. 1. A method for manufacturing a galvanized steel sheet , the method comprising:annealing a hot-rolled pickled steel sheet or a cold-rolled steel sheet under a reducing atmosphere, thereby forming an annealed steel sheet; andgalvanizing the annealed steel sheet, thereby forming a galvanized steel sheet,wherein the hot-rolled pickled steel sheet or the cold-rolled steel sheet comprises: C in a content of 0.10% to 0.5%; Si in a content of 0.7% to 2.5%; Mn in a content of 1.0% to 3%; and Al in a content of 0.01% to 0.5%, in percent by mass, andwherein the annealing is performed at a temperature of 500° C. to 700° C. for 30 to 270 seconds.2. The method according to claim 1 ,wherein the hot-rolled pickled steel sheet or the cold-rolled steel sheet further comprises B in a content of 0.005% or less (excluding 0%).3. The method according to claim 1 ,wherein the hot-rolled pickled steel sheet or the cold-rolled steel sheet further comprises Ti in a content of 0.10% or less (excluding 0%).4. The method according to claim 1 ,wherein the hot-rolled pickled steel sheet or the cold-rolled steel sheet further comprises Cr and Mo in a content of 1 ...

HIGH-YIELD-RATIO HIGH-STRENGTH GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Provided are a high-yield-ratio high-strength galvanized steel sheet and a method for manufacturing thereof. The high-yield-ratio high-strength galvanized steel sheet has a steel sheet having a specified chemical composition and a metallographic structure including, in terms of area ratio, in terms of area ratio, 15% or less of ferrite, 20% or more and 50% or less of martensite, and bainite and tempered martensite in a total amount of 30% or more, and a galvanized layer formed on the steel sheet having a coating weight of 20 g/mto 120 g/mper side, in which a yield strength ratio is 65% or more, a tensile strength is 950 MPa or more, and Mn oxides are contained in the galvanized layer in an amount of 0.015 g/mto 0.050 g/m. 1. A high-yield-ratio high-strength galvanized steel sheet comprising a steel sheet having a composition containing , by mass % ,C: 0.12% or more and 0.25% or less,Si: less than 1%,Mn: 2.0% or more and 3% or less,P: 0.05% or less,S: 0.005% or less,Al: 0.1% or less,N: 0.008% or less,Ca: 0.0003% or less,one or more of Ti, Nb, V, and Zr in a total amount of 0.01% to 0.1%, and the balance being Fe and inevitable impurities, anda metallographic structure including, in terms of area ratio, 15% or less of ferrite, 20% or more and 50% or less of martensite, and bainite and tempered martensite in a total amount of 30% or more, and{'sup': 2', '2, 'a galvanized layer formed on the steel sheet having a coating weight of 20 g/mto 120 g/mper side; and'}a yield strength ratio is 65% or more,a tensile strength is 950 MPa or more, and{'sup': 2', '2, 'Mn oxides are contained in the galvanized layer in an amount of 0.015 g/mto 0.050 g/m.'}2. The high-yield-ratio high-strength galvanized steel sheet according to claim 1 , wherein the composition further contains claim 1 , by mass % claim 1 ,one or more of Mo, Cr, Cu, and Ni in a total amount of 0.1% to 0.5% and/or B: 0.0003% to 0.005%.3. The high-yield-ratio high-strength galvanized steel sheet according to claim 1 , ...

FLUX COMPOSITIONS FOR STEEL GALVANIZATION

This invention relates to a flux composition for treating a metal surface prior to batch hot galvanizing in molten zinc-based alloys. The composition comprises (a) more than 40 and less than 70 wt. % zinc chloride, (b) 10 to 30 wt. % ammonium chloride, (c) more than 6 and less than 30 wt. % of a set of at least two alkali or alkaline earth metal halides, (d) from 0.1 to 2 wt. % lead chloride, and (e) from 2 to 15 wt. % tin chloride, provided that the combined amounts of lead chloride and tin chloride represent at least 2.5 wt. % of said composition. 1. A flux composition for treating a metal surface , comprising (a) more than 40 and less than 70 wt. % zinc chloride , (b) from 10 to 30 wt. % ammonium chloride , (c) more than 6 and less than 30 wt. % of a set of at least two alkali or alkaline earth metal halides , (d) from 0.1 to 2 wt. % lead chloride , and (e) from 2 to 15 wt. % tin chloride , provided that the combined amounts of lead chloride and tin chloride represent at least 2.5 wt. % of said composition.2. A flux composition according to claim 1 , wherein the set of at least two alkali or alkaline earth metal halides is a set of at least two alkali metal chlorides and represents from 10 to 30 wt. % of the flux composition.3. A flux composition according to claim 1 , wherein said set of at least two alkali metal chlorides includes sodium chloride and potassium chloride in a KCl/NaCl weight ratio from 0.2 to 2.0.4. A flux composition according to claim 1 , wherein said set of at least two alkali metal chlorides includes sodium chloride and potassium chloride in a KCl/NaCl weight ratio from 2.0 to 8.0.5. A flux composition according to claim 1 , further comprising at least one metal chloride selected from the group consisting of nickel chloride claim 1 , cobalt chloride claim 1 , manganese chloride claim 1 , cerium chloride and lanthanum chloride.6. A flux composition according to claim 1 , further comprising up to 1.5 wt. % nickel chloride.7. A flux composition ...

FLUX COMPOSITIONS FOR STEEL GALVANIZATION

This invention relates to a flux composition for treating a metal surface, comprising (a) more than 40 and less than 70 wt. % zinc chloride, (b) 10 to 30 wt. % ammonium chloride, (c) more than 6 and less than 30 wt. % of a set of at least two alkali metal chlorides including sodium chloride and potassium chloride, (d) from 0 to 2 wt. % lead chloride, and (e) from 0 to 15 wt. % tin chloride, provided that the KCl/NaCl weight ratio of said set of at least two alkali metal chlorides ranges from 2.0 to 8.0. 1. A flux composition for treating a metal surface , comprising (a) more than 40 and less than 70 wt. % zinc chloride , (b) 10 to 30 wt. % ammonium chloride , (c) more than 6 and less than 30 wt. % of a set of at least two alkali metal chlorides including sodium chloride and potassium chloride , (d) from 0 to 2 wt. % lead chloride , and (e) from 0 to 15 wt. % tin chloride , provided that the KCl/NaCl weight ratio of said set of at least two alkali metal chlorides ranges from 2.0 to 8.02. A flux composition according to claim 1 , wherein said the combined amounts of lead chloride and tin chloride represent at least 2.5 wt. % of said composition.3. A flux composition according to claim 1 , further comprising at least one metal chloride selected from the group consisting of nickel chloride claim 1 , cobalt chloride claim 1 , manganese chloride claim 1 , cerium chloride claim 1 , antimony chloride and lanthanum chloride.4. A flux composition according to claim 1 , further comprising up to 1.5 wt. % nickel chloride.5. A flux composition according to claim 1 , further comprising at least one nonionic surfactant.6. A flux composition according to claim 1 , further comprising at least one corrosion inhibitor.7. A flux composition according to claim 1 , being fluoride salts-free.8. A flux composition according to claim 1 , being free from volatile organics.9. A fluxing bath for hot dip galvanization comprising a flux composition according to dissolved in water.10. A fluxing ...

COLD-ROLLED STEEL PLATE COATED WITH ZINC OR A ZINC ALLOY, METHOD FOR MANUFACTURING SAME, AND USE OF SUCH A STEEL PLATE

The present invention provides a “TRIP effect” cold-rolled and annealed steel sheet which has improved formability and weldability, strength between 780 and 900 MPa and elongation at fracture greater than 19%, the composition of which includes the following elements in percentages expressed by weight: 0.17%≦C≦0.25%, 1.5%≦Mn≦2%, 0.50%≦Si≦1%, 0.50%≦Al≦1.2%, whereby Si+Al≧1.30%, the remainder of the composition including iron and the inevitable impurities resulting from processing. The microstructure of the sheet includes 65 to 85% ferrite and 15 to 35% islands of martensite and residual austenite. The average size of these islands of martensite and residual austenite is less than 1.3 micrometers and their shape factor is less than 3. 117-. (canceled)18. A cold-rolled steel sheet coated with zinc or zinc alloy , the composition of which includes the following , expressed by weight:{'br': None, '0.17%≦C≦0.25%'}{'br': None, '1.5%≦Mn≦2.0%'}{'br': None, '0.50%≦Si≦1%'}{'br': None, '0.50%≦Al≦1.2%'}{'br': None, 'B≦0.001%'}{'br': None, 'P≦0.030%'}{'br': None, 'S≦0.01%'}{'br': None, 'Nb≦0.030%'}{'br': None, 'Ti≦0.020%'}{'br': None, 'V≦0.015%'}{'br': None, 'Cu≦0.1%'}{'br': None, 'Cr≦0.150%'}{'br': None, 'Ni≦0.1%'}{'br': None, '0%≦Mo≦0.150%'}{'br': None, 'whereby Si+Al≧1.30%,'}the remainder of the composition consists of iron and the inevitable impurities resulting from processing, of 65 to 85% ferrite, and', 'of 15 to 35% islands of martensite and residual austenite, the ferrite containing less than 5% non-recrystallized ferrite, a total content of residual austenite being between 10 and 25% and a total martensite content being less than or equal to 10%, an average size of the martensite and residual austenite islands being less than 1.3 micrometers, and an average shape factor of the islands being less than 3,, 'a microstructure of the composition includes, with the contents expressed in area percentagea mechanical strength Rm of the sheet being between 780 and 900 MPa, and an ...

METHOD AND FORMULATIONS FOR REMOVING RUST AND SCALE FROM STEEL AND FOR REGENERATING PICKLING LIQUOR IN HOT-DIP GALVANIZATION PROCESS

This invention provides a cost-effective hot-dip galvanization process for ferrous metals, which is regardful to the environment and to the health of the personnel. 1. A hot-dip galvanization process for stabilizing the surface of ferrous metals comprising steps ofi) removing metal oxide scales and rust from said surface, comprising contacting said surface with a liquid composition comprising phosphoric acid, a hydrophilic polymer, a non-ionic surfactant, and an anti-smut agent (said liquid composition being denoted GF2), wherein said GF2 solubilizes iron oxides forming said scales and rust without solubilizing non-oxidized metal in said surface, thereby preparing said surface for zinc-coating; andii) binding the solubilized iron from said GF2 in an insoluble iron oxalate complex by contacting said GF2 with a solid composition comprising oxalic acid, a nucleation crystallization agent, and an anionic surfactant (said solid composition being denoted GF1), and removing said insoluble iron oxalate complex from said liquid composition, thereby releasing phosphoric acid in GF2 for further use;wherein the use of GF2 in said step i) enables to avoid the formation of dangerous gaseous side products during said surface stabilizing, and to make a uniform and thin zinc coating during said zinc-coating, and wherein the use of GF1 in said step ii) enables to recover and recycle phosphoric acid;wherein the combination of steps i) and ii) results in an environmentally safe and cost-effective hot-dip galvanization process.2. The process of claim 1 , wherein said GF2 comprises 7-40 wt % phosphoric acid claim 1 , 0.5-3 wt % hydrophilic polymer claim 1 , 0.1-1 wt % non-ionic surfactant claim 1 , and 0.05-0.5 wt % anti-smut agent.3. The process of claim 1 , wherein said GF1 comprises 96.5-99 wt % oxalic acid dihydrate claim 1 , 1-3 wt % of iron oxide as the nucleation agent claim 1 , and 0.05-0.5 wt % of the anionic surfactant.4. The process of claim 1 , wherein said hydrophilic ...

HIGH-CORROSION-RESISTANCE HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT APPEARANCE UNIFORMITY AND MANUFACTURING METHOD THEREOF

The present invention provides a high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity. The steel sheet includes: a coating layer containing Al: 4 to 22 mass %, Mg: 1 to 6 mass %, and Si: 0.001 to 1 mass %, and a balance being composed of Zn and inevitable impurities formed on a surface, in which at an interface between the coating layer and a base steel sheet, MgSi phases and Ca phases each mainly composed of Ca or a Ca compound exist, and at least part of the MgSi phases precipitate by using the Ca phases as a nucleus. 1. A high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity , comprising:a coating layer containing Al: 4 to 22 mass %, Mg: 1 to 6 mass %, and Si: 0.001 to 1 mass %, and a balance being composed of Zn and inevitable impurities formed on a surface, wherein{'sub': 2', '2, 'at an interface between said coating layer and a base steel sheet, MgSi phases and Ca phases each mainly composed of Ca or a Ca compound exist, and at least part of the MgSi phases precipitate by using the Ca phases as a nucleus.'}2. The high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity according to claim 1 , wherein a density of the MgSi phases each having a circle-equivalent diameter of 2 μm or more out of the MgSi phases existing at the interface between said coating layer and the base steel sheet is 10 to 1000 pieces per 0.01 mm.3. The high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity according to claim 1 , wherein{'sub': '2', 'an average diameter of Al/MgZn/Zn ternary eutectic phases existing in said coating layer is 5 to 200 μm.'}4. The high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity according to claim 1 , whereinsaid coating layer further contains 0.000001 to 0.5 mass % of one or two or more selected from Ti, Ni, Zr, Sr, Hf, Sc, and B alone or in ...

Method of producing galvannealed steel sheet

A method of producing a galvannealed steel sheet whereby favorable coating appearance can be obtained with high coating adhesion even in the case of galvannealing a steel strip whose Si content is 0.2 mass % or more, and a decrease in tensile strength can be prevented by lowering the alloying temperature. Mixed gas of humidified gas and dry gas, and dry gas are supplied to a soaking zone in an annealing furnace. The mixed gas is timely supplied from a position of lower half of the soaking zone. The dry gas is timely supplied from near an upper hearth roll in the soaking zone, and furnace gas is timely discharged from a gas discharge port located higher than the upper hearth roll, to control a dew point in at least an uppermost part of the soaking zone to −20° C. or more and 0° C. or less.

Preparation Method of Carbon Nitride Electrode Material

The invention discloses a preparation method of a carbon nitride (CN) electrode material. The preparation method comprises the following steps: (1) preparing a precursor film: immersing a clean conductive substrate A into a hot saturated CN precursor aqueous solution, then immediately taking out, after the surface being dried, a uniform precursor film layer on the conductive substrate A was formed. This step can be repeated several times to get different layers of precursor film on the substrate A; (2) preparing the CN electrode: the dry precursor film obtained in step () was encapsulated in a glass tube filled with N. Then the glass tube was inserted into a furnace with Natmosphere to calcinate. After calcination, the uniform CN film electrode was obtained. The method provided by the invention is simple and easy to implement, and convenient in used equipment, suitable for industrial application and popularization. 1. A preparation method of a carbon nitride electrode material , characterized by comprising the following steps:(1) Preparing a precursor film: vertically and rapidly immersing a clean conductive substrate A into a hot saturated CN precursor aqueous solution, then immediately taking out the conductive substrate A, forming a uniform precursor film layer on the conductive substrate A; after the surface being dried, adjusting the thickness of the precursor film layer by repeating the above steps of dipping and drying cycles for many times to form multiple layers, and naturally air-drying or drying the obtained precursor film in a 60° C. drying oven for later use;{'b': '1', 'sub': '2', '(2) Preparing the CN electrode: putting the dry precursor film obtained in step () into a glass tube, introducing nitrogen gas to discharge air in the tube, binding a tube opening with tin foil paper, then putting the glass tube into a furnace with Natmosphere to calcinate at a high temperature, and naturally cooling to obtain the uniform CN film electrode.'}21. The ...

Method for Hot Dip Coating of a Flat Steel Product

A method for hot dip coating a flat stainless steel product with more than 5 wt. % Cr with a protective metallic coating by: heating the flat steel product under an oxygen-free heating atmosphere to 100° C.-600° C. within 1-30 seconds; continuing heating to a holding temperature of 750° C.-950° C., by heating to 550° C.-800° C. under an inert or reducing atmosphere, holding within this temperature window for 1 to 15 seconds under an oxidising atmosphere, and continuing heating under an inert or reducing atmosphere, until the holding temperature is reached; holding at the holding temperature for 10-120 seconds under a reducing atmosphere; and passing the flat steel product through a nozzle area under an inert or reducing atmosphere at 430°-780° C. and into a molten bath in which the flat steel product is coated with the metallic coating.

HOT-DIP GALVANIZED STEEL PLATE WITH EXCELLENT BAKE HARDENABILITY AND ANTI-AGING PROPERTY AT ROOM TEMPERATURE AND MANUFACTURING METHOD THEREFOR

Provided is a hot-dip galvanized steel plate which is applicable as a material for a vehicle outer panel and has an excellent bake hardenability and anti-aging property at room temperature, and a method for manufacturing a hot-dip galvanized steel plate, the method comprising a process including the steps of: winding a hot-rolled steel plate, followed by cooling at a speed of 0.002-0.027° C./sec; cold-rolling the cooled steel plate; continuously annealing the cold-rolled steel plate; and cooling the annealed steel plate in the multi-stage manner of primary to third rounds. 1. A hot-dip galvanized steel sheet , comprising:a cold-rolled steel sheet; anda hot-dip galvanized layer formed on the cold-rolled steel sheet,wherein the cold-rolled steel sheet comprises, by weight %, 0.005 to 0.08% of C, 1.3 to 2.3% of Mn, 1.0% or less of Cr, excluding 0%, 0.1% or less of P, excluding 0%, 0.01% or less of S, excluding 0%, 0.01% or less of N, excluding 0%, 0.01 to 0.06% of sol.Al, and a balance of Fe and inevitable impurities,wherein ferrite and martensite are included as a microstructure, and {'br': None, 'i': K=C', '/C, 'sub': 1', '2, '[Expression 1]'}, 'wherein, K, an average concentration ratio of solid solution carbon before and after baking determined by Expression 1 below, is 0.2 to 0.7,'}{'sub': 1', '2, 'where Cis an average concentration of solid solution C present within 100 nm in a direction of a ferrite grain from ferrite and martensite grain boundaries at a t/4 position taken in a sheet thickness direction before baking, t indicates a thickness of the cold-rolled steel sheet, and Cis an average concentration of solid solution C present within 100 nm in a direction of a ferrite grain from ferrite and martensite grain boundaries at a t/4 position taken in a sheet thickness direction after baking performed for 20 minutes at 140° C.'}2. The hot-dip galvanized steel sheet of claim 1 , wherein the cold-rolled steel sheet comprises 90 to 99 area % of ferrite and 1 to 10 ...

STEEL SHEET WITH EXCELLENT BAKE HARDENING PROPERTIES AND PLATING ADHESION AND MANUFACTURING METHOD THEREFOR

Provided is a steel sheet used as a material for an automotive exterior panel, etc., and a method for manufacturing the same. More particularly, provided is a cold-rolled steel sheet and a hot-dip galvanized steel sheet, which have excellent bake hardening properties, plating adhesion, and anti-aging properties, and a method of manufacturing the same. 1. A steel sheet having excellent bake hardening and plating adhesion , comprising:in weight %, 0.005 to 0.08% of carbon (C), 1.3 to 2.3% of manganese (Mn), 0.03% or less (excluding 0%) of phosphorus (P), 0.01% or less (excluding 0%) of sulfur (S), 0.01% or less (excluding 0%) of nitrogen (N), 0.01 to 0.06% of aluminum (sol.Al), 1.0% or less (excluding 0%) of chromium (Cr), 0.1% or less (excluding 0%) of antimony (Sb), at least one selected from the group consisting of silicon (Si): 0.3% or less (excluding 0%), molybdenum (Mo): 0.2% or less (excluding 0%) and boron (B): 0.003% or less (excluding 0%), a remainder of iron (Fe), and unavoidable impurities, andas a microstructure, in area %, 1 to 5% of martensite and remaining ferrite, {'br': None, 'i': 'Cgb/Cf≥', '3.5\u2003\u2003[Relationship 1]'}, 'wherein a relationship (Cgb/Cf) between an Sb average area occupancy ratio (Cgb, %) of grain boundaries of a martensite phase and a ferrite phase and an average Sb area occupancy ratio (Cf, %) in a ferrite phase within 1 μm around the martensite phase, determined by the following relationship 1, at a point of ¼t in a thickness direction of the steel sheet (where t denotes a thickness (mm) of a cold rolled steel sheet is 3.5 or more,'}(where Cgb (%) indicates an Sb average area occupancy ratio of grain boundaries of a martensitic phase and a ferrite phase at a point of ¼t of a cold rolled steel sheet, and Cf (%) indicates an average Sb area occupancy ratio of a ferrite phase within 1 μm around the martensite phase).2. The steel sheet having excellent bake hardening and plating adhesion of claim 1 , wherein the steel sheet ...

HIGH YIELD RATIO-TYPE HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Provided is a high-strength steel sheet and a method for manufacturing the same and, more specifically, a high-strength steel sheet having a high yield ratio and excellent plating-wettability and stretch-flangeability, and a method for manufacturing the same. 1. A high yield ratio-type high strength steel sheet comprising: {'br': None, '(Si+Cr)/2C≥5\u2003\u2003[Relationship 1]'}, 'in weight %, 0.04 to 0.09% of C, 0.2% or less (excluding 0%) of Si, 2.0 to 3.5% of Mn, 0.3 to 1.2% of Cr, 0.03 to 0.08% of Ti, 0.01 to 0.05% of Nb, 0.0010 to 0.0050% of B, 0.01 to 0.10% of Sol.Al, 0.001 to 0.10% of P, 0.010% or less (including 0%) of S, 0.010% or less (excluding 0%) of N, a remainder of Fe and unavoidable impurities, the contents of Si, Cr and C satisfying the following relationship 1,'}where each component indicates a weight content; and {'br': None, 'i': 'HB/HTM', '()≤1.3\u2003\u2003[Relationship 2]'}, 'as a microstructure, in an area fraction, 50% or more of bainite, 20 to 40% of tempered martensite, and residual ferrite, in which a hardness ratio of a bainite phase and a tempered martensite phase at a ¼t point of a thickness of a steel sheet (where t is the thickness of the steel sheet (mm)), represented by the following relationship 2, is 1.3 or less,'}where HB is a bainite hardness, and HTM is a tempered martensite hardness.2. The high yield ratio-type high strength steel sheet of claim 1 , wherein the tempered martensite has an average particle diameter of 2 μm or less claim 1 , the bainite has an average particle diameter of 3 μm or less claim 1 , and an area fraction of a bainite structure having a particle size of more than 3 μm is 5% or less.3. The high yield ratio-type high strength steel sheet of claim 2 , wherein a distribution density of a nano precipitate having a diameter of 10 nm or less among the bainite and tempered martensite structures is 150 pieces/μmor more.4. The high yield ratio-type high strength steel sheet of claim 1 , wherein the steel sheet ...

STEEL SHEET, PLATED STEEL SHEET, METHOD OF PRODUCTION OF HOT-ROLLED STEEL SHEET, METHOD OF PRODUCTION OF COLD-ROLLED FULL HARD STEEL SHEET, METHOD OF PRODUCTION OF STEEL SHEET, AND METHOD OF PRODUCTION OF PLATED STEEL SHEET

A steel sheet, a plated steel sheet, and methods for producing a hot-rolled steel sheet, a cold-rolled full hard steel sheet, and a steel sheet. The steel sheet has a specified composition and a microstructure including 0 to 60% of polygonal ferrite and 40 to 100% of a total of martensite, bainite, and residual austenite in terms of an area ratio within 20 μm from the steel sheet surface. The content of Mn in martensite present within 20 μm of the steel sheet surface ([Mn]) and the content of Mn in a bulk ([Mn]) satisfy [Mn]/[Mn]≤1.5. At a location 300 μm from the steel sheet surface, an area ratio of the martensite is in a range of 40 to 80%, and the polygonal ferrite and the bainite have an average crystal grain size of less than 15 μm. 1. A steel sheet having a chemical composition comprising , by mass %:C: 0.05 to 0.25%;Si: 1.0% or less;Mn: 2.0 to 4.0%;P: 0.100% or less;S: 0.02% or less;Al: 1.0% or less;N: 0.001 to 0.015%;at least one element selected from the group consisting of Ti:2. The steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , by mass % claim 1 , at least one element selected from the group consisting of:Cr: 0.005 to 2.000%,V: 0.005 to 2.000%,Cu: 0.005 to 2.000%,Ni: 0.005 to 2.000%,B: 0.0001 to 0.0050%,Ca: 0.0001 to 0.0050%,REM: 0.0001 to 0.0050%,Sb: 0.0010 to 0.1000%, andSn: 0.0010 to 0.5000%.3. The steel sheet according to claim 1 , wherein an average crystal grain size of the martensite present in the range of 20 μm in the sheet thickness direction from the surface of the steel sheet is 20 μm or less.4. A plated steel sheet comprising a plating layer disposed on the surface of the steel sheet of .5. A plated steel sheet comprising a plating layer disposed on the surface of the steel sheet of .6. The plated steel sheet according to claim 4 , wherein the plating layer is a hot-dip galvanized layer or a hot-dip galvannealed layer.7. The plated steel sheet according to claim 5 , wherein the plating layer ...

METAL-COATED STEEL STRIP

A steel strip having a coating of an aluminium-zinc-silicon alloy on at least one surface of the strip is disclosed. The strip is characterised in that the aluminium-zinc-silicon alloy contains less than 1.2 wt. % silicon and also contains magnesium. A method of forming a coating of an aluminium-zinc-silicon alloy on a steel strip is also disclosed. The method includes moving steel strip upwardly through a coating pot containing a bath of an aluminium-zinc-silicon alloy and having an opening in a bottom wall of the pot and forming a coating of the alloy on the strip. The method is characterized by minimizing residence time of steel strip in contact with the aluminium-zinc-silicon alloy bath in the pot. 1. A steel strip having a coating of an aluminium-zinc-silicon alloy on at least one surface of the strip which is characterised in that the aluminium-zinc-silicon alloy contains less than 1.2 wt. % silicon and also contains greater than 1 wt. % magnesium.2. The steel strip defined in wherein the silicon concentration is 0.2-0.5 wt. %.3. The steel strip defined in -wherein the silicon concentration is at least 0.2 wt. % less than 1.2 wt. %.4. The steel strip defined in wherein the silicon concentration is at least 0.2 wt. %.5. The steel strip defined in wherein the coating has small spangles.6. The steel strip defined in wherein the magnesium concentration is less than 8 wt. %.7. The steel strip defined in wherein the magnesium concentration is less than 3 wt. %.8. The steel strip defined in wherein the magnesium concentration is between 1 and 3 wt. %.9. The steel strip defined in wherein the magnesium concentration is between 1.5 and 2.5 wt. %.10. The steel strip defined in wherein the aluminium-zinc-silicon alloy is a titanium diboride-modified alloy.11. The steel strip defined in wherein the aluminium-zinc-silicon alloy contains strontium and/or calcium.12. The steel strip defined in wherein the concentration of (i) strontium or (ii) calcium or (iii) strontium and ...

HOT-DIP GALVANIZATION SYSTEM AND HOT-DIP GALVANIZATION METHOD, IN PARTICULAR FOR MASS PRODUCTION

The invention relates to a system and a method for the hot-dip galvanization of motor-vehicle components, preferably for mass-production hot-dip galvanization of a plurality of identical or similar motor-vehicle components, in particular in batches, preferably for batch galvanization, especially preferably for high-precision hot-dip galvanization. 113-. (canceled)14. A hot-dip galvanizing system for the large-scale hot-dip galvanization of a multiplicity of identical or similar automotive components , a galvanizing bath comprising a zinc/aluminum alloy in a liquid molten form,', 'a conveying device comprising at least one goods carrier for conveying a group of automotive components to be fastened on the goods carrier, and', 'a flux application device for the application of a flux to the surface of the automotive components,, 'wherein the system comprises a hot-dip galvanizing device for hot-dip galvanizing the automotive componentswherein the system further comprising a handling device for supplying, immersing and emersing a separated and singled out automotive component to, into and from the galvanizing bath comprising the zinc/aluminum alloy in a liquid molten form, wherein the handling device comprises at least one handling means disposed between the flux application device and the hot-dip galvanizing device,wherein the handling means is configured or equipped such that it separates and withdraws a single of the automotive components from the group of automotive components and subsequently supplies it to the hot-dip galvanizing device for individual hot-dip galvanizing of the separated and singled out the automotive components andwherein the handling means is configured or equipped such that a separated and singled out automotive component is immersed into an immersion region of the galvanizing bath, then moved from the immersion region to an adjacent emersion region and then emersed in the emersion region.15. The system as claimed in claim 14 ,wherein the system ...

METHOD FOR MANUFACTURING A METAL SHEET WITH A ZnAl COATING AND WITH OPTIMIZED WIPING, CORRESPONDING METAL SHEET, PART AND VEHICLE

The present invention provides a deformed part created by forming a coated metal sheet into a part, the coated metal sheet comprising a steel substrate, at least one face of which is coated with a metal coating deposited by dipping the substrate in a bath, said coating comprising between 0.2 and 0.7% by weight of Al, the remainder of the metal coating being Zn and inevitable impurities, wherein an outer surface of a metal coating of the deformed part has a waviness Wa0.8 of less than or equal to 0.43 μm. 1. A deformed part created by forming a coated metal sheet into a part , the coated metal sheet comprising a steel substrate , at least one face of which is coated with a metal coating deposited by dipping the substrate in a bath , said coating comprising between 0.2 and 0.7% by weight of Al , the remainder of the metal coating being Zn and inevitable impurities , wherein an outer surface of a metal coating of the deformed part has a waviness Waof less than or equal to 0.43 μm.2. The deformed part according to claim 1 , wherein the outer surface of the metal coating of the deformed part has a waviness Waof less than or equal to 0.41 μm.3. The deformed part according to claim 1 , wherein the outer surface of the metal coating of the deformed part has a waviness Waof less than or equal to 0.37 μm.4. The deformed part according to claim 1 , further comprising a film of paint on the metal coating of the deformed part.5. The deformed part according to claim 4 , wherein a thickness of the film of paint is less than or equal to 120 μm.6. The deformed part according to claim 4 , wherein a thickness of the film of paint is less than or equal to 100 μm.7. A land motor vehicle comprising a body claim 1 , the body comprising a deformed part according to .8. The deformed part according to claim 1 , wherein the metal coating further includes one or more additional elements selected from the following: Si claim 1 , Sb claim 1 , Pb claim 1 , Ti claim 1 , Ca claim 1 , Mn claim 1 , ...

METHOD FOR MANUFACTURING A METAL SHEET WITH A ZnAl COATING AND WITH OPTIMIZED WIPING, CORRESPONDING METAL SHEET, PART AND VEHICLE

The present invention provides a method for manufacturing a metal sheet. In this method, at least one of the following equations is satisfied: 2. The method according to claim 1 , wherein the metal coating further includes one or more additional elements selected from the following: Si claim 1 , Sb claim 1 , Pb claim 1 , Ti claim 1 , Ca claim 1 , Mn claim 1 , Sn claim 1 , La claim 1 , Ce claim 1 , Cr claim 1 , Zr or Bi claim 1 , a weight content of each additional element in the metal coating being less than 0.3%.3. The method according to claim 1 , wherein the waviness Waof the outer surface of the metal coating after solidification and before any skin-pass operation is less than or equal to 0.35 μm.4. The method according to claim 1 , further comprising the step of:{'sub': '2.5', 'skin-pass rolling the metal sheet with EDT work rolls, the EDT work rolls having a working surface having a roughness Rafrom 2.05 to 2.95 μm.'}5. The method according to claim 1 , further comprising the step of:{'sub': '2.5', 'skin-pass rolling the metal sheet with EBT work rolls, the EBT work rolls having a working surface having a roughness Rafrom 2.90 to 4.10 μm.'}7. The method according to claim 1 , further comprising claim 1 , before the deposition step claim 1 , a step of:{'sub': '2.5', 'cold rolling the metal sheet, at least a last pass of the cold-rolling being achieved with rectified and non-etched work rolls for which the work surfaces have a roughness Raof less than or equal to 0.5 μm.'}8. The method according to claim 1 , further comprising claim 1 , before the deposition step claim 1 , a step of:{'sub': '2.5', 'cold rolling the metal sheet, at least the last pass being achieved with rectified and non-etched work rolls for which the work surfaces have a roughness Raof less than or equal to 0.5 μm.'}9. The method according to claim 1 , wherein the metal coating has a weight content of Al less than or equal to 0.6%.10. The method according to claim 1 , wherein the metal coating ...

CONTINUOUS GALVANIZING LINE

A continuous galvanizing line having an annealing furnace of an all radiant tube heating type includes a moisture removal device, dew-point meters, outlets through which the atmospheric gas in the furnace is collected and inlets through which the atmospheric gas from which moisture has been removed with the moisture removal device is fed into the furnace, the dew-point meters and the outlets being placed at least at two points which respectively exist on a side wall in the vicinity of the entrance of the annealing furnace and on a side wall in the vicinity of the furnace top or the furnace bottom at a position where a steel sheet has a maximum end-point temperature, the inlets being placed at two points which respectively exist on side walls on the sides opposite to the sides of the two points for the outlets in the height direction of the furnace, making it possible to steadily control the dew-point of the atmospheric gas to be −45° C. or lower and −80° C. or higher throughout the whole area of the annealing furnace. 1. A continuous galvanizing line having an annealing furnace of an all radiant tube heating type , the line comprising:a moisture removal device with which an atmospheric gas in the annealing furnace is collected and moisture is removed from the gas and then the gas is returned to the furnace,dew-point meters, with which the dew-point of the atmospheric gas is observed, and the outlets, through which the atmospheric gas in the furnace is collected, being placed at least at two points which respectively exist on a side wall in the vicinity of the entrance of the annealing furnace and on a side wall in the vicinity of the furnace top or the furnace bottom at the position where a steel sheet has a maximum end-point temperature, andinlets, through which the atmospheric gas from which moisture has been removed with the moisture removal device is fed into the furnace, being placed at two points which respectively exist on side walls opposite to said two ...

HOT-DIP GALVANIZED STEEL PIPE AND METHOD OF MANUFACTURING THE SAME

There are provided a hot-dip galvanized steel pipe in which the plating layer thereof is less liable to peel off even if the steel pipe is worked, and a method of manufacturing the hot-dip galvanized steel pipe. The hot-dip galvanized steel pipe includes a steel pipe and the plating layer formed on the surface of the steel pipe. Throughout the entire depth of plating layer, the fn defined by the following formula is at least 99.9: 2. A method of manufacturing a hot-dip galvanized steel pipe , comprising a step of dipping a material pipe in a hot-dip galvanizing bath , whereinthe hot-dip galvanizing bath contains 0.002 to 0.01 mass % of Al, the balance being Zn and impurities, anda total content of Pb, Sn, Cd, Sb, Bi, Cu, Ni, and In of the impurities is at most 0.1 mass %.3. The method of manufacturing a hot-dip galvanized steel pipe according to claim 2 , further comprising:a step of pickling the material pipe by means of sulfuric acid having a temperature of at least 65° C.; anda step of treating the pickled material pipe by means of a flux solution before the step of dipping the material pipe in the hot-dip galvanizing bath,wherein the flux solution containing at least 600 g/L in total of at least one of zinc chloride and ammonium chloride and 0.05 to 0.3 mass % of surface active agent. The present invention relates to a hot-dip galvanized steel pipe and a method of manufacturing the hot-dip galvanized steel pipe.The hot-dip galvanization has been used widely as a technique for improving the corrosion resistance of a steel material.JP2009-221601A, JP2009-221604A, JP2009-197328A, JP2011-26630A, and JP2009-221605A describe methods of manufacturing a hot-dip galvanized material in which, even if a molten zinc bath in which the content of Pb is restrained to at most 0.1 mass % and the content of Cd is restrained to at most 0.01 mass % is used in conformity to the RoHS instructions, poor plating occurs infrequently. In the methods of manufacturing a hot-dip galvanized ...

HIGH STRENGTH AND HIGH FORMABILITY STEEL SHEET AND MANUFACTURING METHOD

A cold-rolled and heat-treated steel sheet, has a composition comprising, by weight percent: n0.10%≤C≤0.25%, 3.5%≤Mn—≤6.0%, 0.5%≤Si≤2.0%, 0.3%≤Al≤1.2%, with Si+Al≥0.8%, 0.10%≤Mo≤0.50%, S≤0.010%, P≤0.020%, N≤0.008%. The cold-rolled steel sheet has a microstructure consisting of, in surface fraction: between 10% and 45% of ferrite, having an average grain size of at most 1.3 μm, the product of the surface fraction of ferrite by the average grain size of the ferrite being of at most 35 μm %, between 8% and 30% of retained austenite, the retained austenite having an Mn content higher than 1.1*Mn %, Mn % designating the Mn content of the steel, at most 8% of fresh martensite, at most 2.5% of cementite and partitioned martensite. 129-. (canceled)30. A cold-rolled and heat-treated steel sheet , made of a steel having a composition comprising , by weight percent:0.10%≤C≤0.25%,3.5%≤Mn≤6.0%,0.5%≤Si≤2.0%,0.3%≤Al≤1.2%,with Si+Al≥0.8%,0.10%≤Mo≤0.50%,S≤0.010%,P≤0.020%,N≤0.008%,and optionally at least one of the following elements selected from a group consisting of Cr, Ti, Nb, V and B, such that by weight percent:0.01%≤Cr≤1.0%,0.010%≤Ti≤0.080%,0.010%≤Nb≤0.080%,0.010%≤V≤0.30%,0.0005%≤B≤0.004%,a remainder of the composition being iron and unavoidable impurities resulting from the processing, between 10% and 45% of ferrite, the ferrite having an average grain size of at most 1.3 μm, a product of the surface fraction of the ferrite by the average grain size of the ferrite being of at most 35 μm %,', 'between 8% and 30% of retained austenite, the retained austenite having an Mn content higher than 1.1*Mn %, Mn % designating the Mn content of the steel,', 'at most 8% of fresh martensite,', 'at most 2.5% of cementite, and', 'partitioned martensite., 'the cold-rolled steel sheet having a microstructure consisting of, in surface fraction31. The cold-rolled and heat-treated steel sheet according to claim 30 , wherein the retained austenite has an average C content of at least 0.4%.32. The ...

VEHICLE BODY AND METHOD FOR MANUFACTURING A MOLDED PART

A method for manufacturing a corrosion-protected steel molded part with an at least predominantly bainitic structure is provided. The method includes heating a blank of sheet steel to an austenization temperature; compression molding the blank while simultaneously cooling, so as to obtain a molded part; and bainitizing the molded part in a zinc coating bath. 2. The method according to claim 1 , wherein the bainitization temperature is not dropped during compression molding.3. The method according to claim 1 , wherein the retention time of the steel molded part in the zinc coating bath measures at least 2 minutes.4. The method according to claim 1 , wherein the zinc coating bath contains zinc as well as aluminum in an amount that lowers the melting point of the zinc coating bath to below the melting point of pure zinc.5. The method according to claim 3 , wherein zinc coating takes place in a temperature range suitable for the formation of upper bainite.6. The method according to claim 1 , wherein the zinc coating bath exhibits a percentage of rare earth metals ranging between 0.1 and 2% w/w.7. The method according to claim 1 , wherein the zinc coating bath exhibits a percentage of magnesium ranging between 0.5 and 2% w/w.8. The method according to claim 1 , wherein heating the blank of sheet steel to the austenization temperature takes place under an inert or reducing atmosphere.9. The method according to claim 1 , wherein the blank of sheet steel is fabricated out of a press-hardening steel.10. A vehicle body claim 1 , comprising:a molded part as a component of the vehicle body, the molded part comprising a corrosion-protected steel with an at least predominantly bainitic structure.11. The vehicle body of claim 10 , wherein the molded part is an A- claim 10 , B- or C-pillar claim 10 , a frame claim 10 , a front or rear frame extension claim 10 , a tunnel cap claim 10 , a strike plate or a cross member.12. The method according to claim 1 , wherein the retention time ...

METHOD FOR MANUFACTURING HIGH STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT STABILITY OF MECHANICAL PROPERTIES, FORMABILITY, AND COATING APPEARANCE

A method of manufacturing a high strength galvanized steel sheet has a first heating step including heating to 400° C. to 750° C. in an atmosphere containing O: 0.1 to 20 percent and HO: 1 to 50 percent and heating to 600° C. to 850° C. in an atmosphere containing O: 0.01 to less than 0.1 percent and HO: 1 to 20 percent is applied to a steel sheet, a second heating step includes holding the steel sheet in an atmosphere containing H: 1 to 50 percent and having a dew point of 0° C. or lower at 750° C. to 900° C. for 15 to 600 s, cooling to a temperature of 450° C. to 550° C., and holding is performed at that temperature for 10 to 200 s, and a galvanization treatment is applied. 1. A method of manufacturing a high strength galvanized steel sheet having excellent stability of mechanical properties , formability , and coating appearance , comprising:{'sub': 2', '2', '2', '2, 'applying a first heating step to a steel sheet containing C: 0.04% or more and 0.13% or less, Si: 0.7% or more and 2.3% or less, Mn: 0.8% or more and 2.0% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.1% or less, N: 0.008% or less, and the remainder composed of Fe and incidental impurities, on a percent by mass basis, in which, in the former part, heating is performed in an atmosphere containing O: 0.1 to 20 percent by volume and HO: 1 to 50 percent by volume such that a temperature is at 400° C. to 750° C. and, in a latter part, heating is performed in an atmosphere containing O: 0.01 to less than 0.1 percent by volume and HO: 1 to 20 percent by volume such that the temperature is 600° C. to 850° C.;'}{'sub': '2', 'applying a second heating step to the resultant steel sheet, in which holding is performed in an atmosphere containing H: 1 to 50 percent by volume and having a dew point of 0° C. or lower at a temperature of 750° C. to 900° C. for 15 to 600 s, cooling to a temperature of 450° C. to 550° C. is performed, and holding is performed at a temperature of 450° C. to 550° C. for 10 to 200 s; ...

Tube pump for removing dross during galvanizing

A tube pump includes a tube having a closed off lower end portion and an open upper end portion. The upper end portion of the tube is adapted to be fastened to support structure. The lower end portion is adapted to be submerged in molten metal. The tube includes an inlet opening and an outlet opening. A pump shaft is adapted to be connected to a motor driven drive shaft and has upper and lower end portions. The pump shaft extends inside the tube. An impeller is fastened to the lower end portion of the pump shaft and disposed near a lower end portion of the tube. Inlet and outlet conduits are connected to the tube inlet and outlet openings adjacent to a top or bottom of the impeller so that a conduit inlet opening is disposed near the surface of the bath and a conduit outlet opening is disposed remote from the conduit inlet opening. The tube pump removes dross from the galvanizing bath to produce galvanized parts having improved properties.

Method and an arrangement for manufacturing a hot dip galvanized rolled high strength steel product

A method and arrangement for manufacturing hot dip galvanized rolled high strength steel product is presented. The method comprises providing a rolled steel product, heating and annealing the rolled steel product for creating a layer of iron oxide on the surface of the rolled steel product, cooling the rolled steel product, having the iron oxide layer, in a first cooling step to a temperature in a temperature range of 560-600° C. and holding for 3-10 seconds, quenching said rolled steel product, covered with the layer of iron oxide, in a second cooling step by immersing it into a zinc bath comprising aluminium and having a temperature between 440-450° C. for 1-5 seconds and cooling the rolled steel product in a third cooling step to room temperature. An arrangement for implementing the method is also presented.

PLATED STEEL SHEET

A plated steel sheet includes: a steel sheet; and a plating layer that is formed on at least a part of a surface of the steel sheet, in which a chemical composition of the plating layer includes, by mass %, Al: more than 5.00% and 35.00% or less, Mg: 3.00% to 15.00%, Si: 0% to 2.00%, Ca: 0% to 2.00%, and a remainder of Zn and impurities, in which in a cross section of the plating layer in a thickness direction, the area ratio of a lamellar structure in which an (Al—Zn) phase and a MgZnphase are arranged in layers is 10% to 90%, a lamellar spacing of the lamellar structure is 2.5 μm or less, and the area ratio of an (Al—Zn) dendrite is 35% or less. 1. A plated steel sheet comprising:a steel sheet; anda plating layer that is formed on at least a part of a surface of the steel sheet,wherein a chemical composition of the plating layer includes, by mass %,Al: more than 5.00% and 35.00% or less,Mg: 3.00% to 15.00%,Si: 0% to 2.00%,Ca: 0% to 2.00%, anda remainder of Zn and impurities,in a cross section of the plating layer in a thickness direction,{'sub': '2', 'an area ratio of a lamellar structure in which an (Al—Zn) phase and a MgZnphase are arranged in layers is 10% to 90%,'}a lamellar spacing of the lamellar structure is 2.5 μm or less, andan area ratio of an (Al—Zn) dendrite is 35% or less.2. The plated steel sheet according to claim 1 ,wherein the chemical composition of the plating layer includes, by mass %, one or more kinds ofAl: 11.00% to 30.00%,Mg: 3.00% to 11.00%, andCa: 0.03% to 1.00%.3. The plated steel sheet according to claim 1 , wherein the chemical composition of the plating layer further includes claim 1 , by mass %:Sb: 0.50% or less;Pb: 0.50% or less;Cu: 1.00% or less;Sn: 1.00% or less;Ti: 1.00% or less;Sr: 0.50% or less;Ni: 1.00% or less;Mn: 1.00% or less; andFe: 2.00% or less.4. The plated steel sheet according to claim 1 ,wherein in the cross section of the plating layer in the thickness direction, the area ratio of the lamellar structure is 50% to 90 ...

Manufacturing method of textured and coated electrode wire

A manufacturing method of a textured and coated electrode wire, comprising: selecting a copper-zinc alloy as a core material, preparing, by means of electroplating/hot-dipping, a metal zinc coating on a surface of the wire material, then performing pre-treatment on the coated electrode wire by means of discontinuous diffusion annealing to obtain a coated electrode wire material having a multi-layer structure of Zn/β-Cu γ-Cu/α-Cu, and then using multiple cold drawing treatments and a stress-relief annealing treatment to modify the electrode wire and obtain a textured and coated electrode wire material. Compared to conventional copper alloy electrode wires and zinc-coated electrode wires, the material has advantages of a fast cutting speed, low cutting cost, low environmental pollution, etc., wherein the cutting speed increases by 12% or more when compared with copper alloy electrode wire, the wire breakage rate during cutting processes decreases by 30%, and the replacement time interval of an ion-exchange resin filter for cooling water increases by 10%.

METHOD FOR THE HOT FORMING OF A STEEL COMPONENT

A method for hot forming a steel component is provided. The steel component is heated into a range of complete or partial austenitization in a heat treatment step. The heated steel component is both hot-formed and quench-hardened in a forming step. A first pretreatment step precedes the heat treatment step in terms of process, in which first pretreatment step the steel component is provided with a corrosion-resistant protective layer in order to protect against scaling in the heat treatment step. Before the heat treatment step is performed, a surface oxidation process occurs in a second pre-treatment step, in which a weakly reactive, corrosion-resistant oxidation layer is formed on the scale protection layer by means of which oxidation layer abrasive tool wear is reduced in the forming step. 1. A method comprising:hot forming a steel component heated into a range of complete or partial austenitization in a heat treatment step;performing a forming step in which the heated steel component is both hot-formed and quench-hardened;performing a first pretreatment step that precedes the heat treatment step in terms of process, in the first pretreatment step the steel component is provided with a corrosion-resistant anti-scale layer to protect against scaling in the heat treatment step; andperforming a second pretreatment step before the heat treatment step so that a surface oxidation process occurs in the second pretreatment step in which surface oxidation process a weakly reactive corrosion-resistant oxidation layer is formed on the anti-scale layer such that abrasive tool wear is reduced in the forming step.2. The method according to claim 1 , wherein the surface oxidation in the second pretreatment step is carried out by pickling passivation claim 1 , and wherein claim 1 , for the pickling passivation claim 1 , the steel component is treated in a pickling bath with a pickling solution and then dried.3. The method according to claim 2 , wherein the pickling solution is an ...

SECTION AND METHOD FOR COOLING A CONTINUOUS LINE COMBINING DRY COOLING AND WET COOLING

Cooling section for a steel strip continuous annealing or galvanizing line arranged to handle a metal strip (), said section comprising at least one area () for dry cooling set up to project gas on said steel strip and at least one wet cooling area () set up to project a liquid or a mixture of gas and liquid on said steel strip. 1125. Cooling section for a steel strip continuous annealing or galvanizing line arranged to handle a metal strip () , said section comprising at least one area () for dry cooling set up to project gas on said steel strip and at least one wet cooling area () set up to project a liquid or a mixture of gas and liquid on said steel strip.2. Cooling section as per claim 1 , where the dry cooling area and wet cooling area are arranged in a vertical pass claim 1 , the wet cooling area being located beneath the dry cooling area.34. Cooling section as per claim 1 , also including an atmosphere separation seal () between the dry cooling area and the wet cooling area.48910118921512910514. Cooling section as per claim 3 , where the atmosphere separation seal comprises three pairs of rolls ( claim 3 , claim 3 , ) claim 3 , each of the pairs set transversely to the metal strip running direction claim 3 , said three pairs of rolls creating between them two areas within the said seal claim 3 , respectively a first area () between the first two pairs of rolls ( claim 3 , ) in the strip running direction and located on the dry cooling area () side with means of extraction () claim 3 , and respectively a second area () between the two last pairs of rolls ( claim 3 ,) in the strip running direction and located on the wet cooling area () side with means () to inject an inert gas.5242526272829. Cooling section as per claim 1 , also including a drying and purging system ( claim 1 , claim 1 , claim 1 , claim 1 , claim 1 , ) of the wet cooling area.62728. Cooling section as per claim 5 , where the drying and purging system of the wet cooling area includes equipment ...

ZN ALLOY PLATED STEEL SHEET HAVING EXCELLENT PHOSPHATABILITY AND SPOT WELDABILITY AND METHOD FOR MANUFACTURING SAME

A Zn alloy plated steel sheet having excellent phosphatability and spot weldability and a method for manufacturing the same are provided. In the Zn alloy plated steel sheet including a base steel sheet and a Zn alloy plating layer, the Zn alloy plating layer includes, by wt %, Al: 0.5-2.8%, Mg: 0.5-2.8%, and a remainder of Zn and inevitable impurities, and a cross-sectional structure of the Zn alloy plating layer includes, by area percentage, more than 50% of a Zn single phase structure and less than 50% of a Zn—Al—Mg-based intermetallic compound. A surface structure of the Zn alloy plating layer includes, by area percentage, 40% or less of a Zn single phase structure and 60% or more of a Zn—Al—Mg-based intermetallic compound. 122-. (canceled)23. A zinc (Zn) alloy plated steel sheet , the zinc alloy plated steel sheet comprising a base steel sheet and a zinc alloy plating layer ,wherein the zinc alloy plating layer includes 0.5 wt % to 2.8 wt % of aluminum (Al) and 0.5 wt % to 2.8 wt % of manganese (Mn), with a remainder of Zn and inevitable impurities,a cross-sectional structure of the zinc alloy plating layer includes, by area percentage, a Zn single phase structure of more than 50% (excluding 100%) and a Zn—Al—Mg-based intermetallic compound of less than 50% (excluding 0%), anda surface structure of the zinc alloy plating layer includes, by area percentage, a Zn single phase structure of 40% or less (excluding 0%) and a Zn—Al—Mg-based intermetallic compound of 60% or more (excluding 100%).24. The zinc alloy plated steel sheet of claim 23 , the zinc alloy plating layer includes 0.8 wt % to 2.0 wt % of Al and 0.8 wt % to 2.0 wt % of Mg claim 23 , with a remainder of Zn and inevitable impurities.25. The zinc alloy plated steel sheet of claim 23 , wherein claim 23 , when an area percentage of the Zn single phase structure of the cross-sectional structure is a claim 23 , and an area percentage of the Zn single phase structure of the surface structure is b claim 23 , a ...

PRESS HARDENED PARTS AND METHOD OF PRODUCING THE SAME

The present invention is to produce press hardened parts having excellent properties while avoiding a peeling of a plated layer or an intergranular cracking of a base material during a press forming, in such a manner that when a surface-treated steel sheet in which a Zn—Fe-based plated layer is formed on a surface of a base steel sheet is manufactured by a press hardening process, the forming is started after the surface-treated steel sheet is heated to a temperature that is not lower than an Actransformation point of the base steel sheet and 950° C. or lower and the surface-treated steel sheet is then cooled to a temperature that is not higher than a solidifying point of the plated layer depending on the content of Fe in the plated layer. 1. A method for producing a press hardened part , the method comprising:{'sub': '1', 'heating a surface-treated steel sheet manufactured by a press hardening process to a temperature not lower than an Actransformation point of a base steel sheet and 950° C. or lower;'}subsequently forming a Zn—Fe-based plated layer on a surface of the base steel sheet; andsubsequently cooling the surface-treated steel sheet to a temperature not higher than a solidifying point of the plated layer depending on a content of Fe in the plated layer.2. The method according to claim 1 , wherein the content of Fe in the plated layer is from 5 to 80 mass %.3. The method according to claim 1 ,wherein said cooling occurs at an average cooling rate of 20° C./s or more.4. The method according to claim 1 , whereinsaid forming starts at a temperature higher than a martensitic transformation start temperature, andsaid cooling finishes at a temperature lower than the martensitic transformation start temperature.5. A press hardened part produced by the method according to .6. A press hardened part produced by the method according to .7. A press hardened part produced by the method according to .8. A press hardened part produced by the method according to . The ...

METHOD FOR PRODUCING A STEEL STRIP WITH IMPROVED BONDING OF METALLIC HOT-DIP COATINGS

A cold- or hot-rolled steel strip with a metallic coating, the steel strip having iron as the main constituent and, in addition to carbon, an Mn content of 8.1 to 25.0 wt. % and optionally one or more of the alloying elements Al, Si, Cr, B, Ti, V, Nb and/or Mo. The uncoated steel strip is first cleaned, a layer of pure iron is applied to the cleaned surface, an oxygen-containing, iron-based layer containing more than five mass percent of oxygen is applied to the layer of pure iron. The steel strip is then annealed and is reduction-treated in a reducing furnace atmosphere during the annealing treatment to obtain a surface consisting mainly of metallic iron. The steel strip is then hot-dip coated with the metallic coating. This creates uniform and reproducible bonding conditions for the coating on the steel strip surface. 120.-. (canceled)21. A method for producing a cold-rolled or hot-rolled steel strip having a metallic coat , where the steel strip comprises iron as a main constituent and , in addition to carbon , an Mn content of 8.1 to 25.0 wt. % and optionally one or more of the alloy elements Al , Si , Cr , B , Ti , V , Nb and/or Mo , said method comprising:cleaning the surface of the uncoated steel strip;applying a layer of pure iron with an average iron content of more than 96 wt. % onto the cleaned surface;applying onto the layer of pure iron an oxygen-containing, iron-based layer, which layer contains more than 5 mass percent of oxygen;subjecting the steel strip together with the oxygen-containing, iron-based layer to annealing treatment, wherein during the course of the annealing treatment the steel strip is reduction-treated in a reducing furnace atmosphere; andhot-dip coating the steel strip with a metallic coat after the steel strip has been subjected to the annealing treatment and reduction-treated.22. The method as claimed in claim 21 , wherein an average thickness of the pure iron layer is formed to be 0.05 to 0.6 μm and an average thickness of the ...

Continuous hot-dip metal coating method and continuous hot-dip metal coating line

A continuous hot-dip metal coating method that can reduce both non-coating caused by metal vapor generated in a snout and non-coating caused by an oxide film on a molten metal bath surface in the snout and stably and promptly change the oxidizability of the atmosphere in the snout is provided. In a continuous hot-dip metal coating method, oxidizing gas is supplied into a snout 14 , a temperature of an inner wall surface of the snout is maintained at 150° C. or less below a temperature of the molten metal bath, and an atmospheric temperature of an upper portion in the snout is maintained at 100° C. or less below the temperature of the molten metal bath.

METHOD FOR FORMING A COLD ROLLED, COATED AND POST BATCH ANNEALED STEEL SHEET

A method for forming a cold rolled, coated and post batch annealed steel sheet is provided. The method includes cold rolling a steel sheet; coating the cold rolled steel sheet with a zinc or zinc alloy coating, the cold rolled, coated steel sheet having an initial hole expansion and an initial yield strength and post batch annealing the cold rolled, coated steel sheet at a tempering temperature in a range from 150 to 650° C., the post batch annealed steel sheet having a final hole expansion and a final yield strength. The steel sheet includes (in wt. %) C—0.1-0.3%, Mn—1-3%, Si—0.5-3.5%, Al—0.05-1.5% and Mo+Cr being between 0-1.0%. The final hole expansion is at least 80% greater than the initial hole expansion and the final yield strength is at least 30% greater than the initial yield strength. 1. A method for forming a cold rolled , coated and post batch annealed steel sheet comprising the steps of: C—0.1-0.3%;', 'Mn—1-3%;', 'Si—1.5-3.5%;', 'Al—0.05-1.5%; and', 'Mo+Cr being between 0-1.0%;, 'cold rolling a steel sheet comprising (in wt. %)coating the cold rolled steel sheet with a zinc or zinc alloy coating, the cold rolled, coated steel sheet having an initial hole expansion, an initial yield strength, an initial tensile strength and an initial total elongation prior to post batch annealing; andpost batch annealing the cold rolled, coated steel sheet at a tempering temperature in a range from 150 to 650° C. the cold rolled, coated and post batch annealed steel sheet having a final hole expansion, a final yield strength, a final tensile strength and a final total elongation after post batch annealing;the final hole expansion being at least 80% greater than the initial hole expansion, andthe final yield strength being at least 30% greater than the initial yield strength.2. The method for forming a cold rolled claim 1 , coated and post batch annealed steel sheet of claim 1 , further comprising the steps of:hot rolling the steel sheet prior to coating the cold rolled ...

STEEL SHEET, COATED STEEL SHEET, AND METHODS FOR MANUFACTURING SAME

A steel sheet having TS of 980 MPa or more and YR of 68% or more is obtained by providing a predetermined chemical composition and a predetermined steel microstructure, where an average aspect ratio of crystal grains of each phase (polygonal ferrite, martensite, and retained austenite) is 2.0 or more and 20.0 or less, wherein the polygonal ferrite has an average grain size of 4 μm or less, the martensite has an average grain size of 2 μm or less, the retained austenite has an average grain size of 2 μm or less, and a value obtained by dividing a Mn content in the retained austenite in mass % by a Mn content in the polygonal ferrite in mass % equals 2.0 or more. 17-. (canceled)8. A steel sheet comprising: C: 0.030% or more and 0.250% or less,', 'Si: 0.01% or more and 3.00% or less,', 'Mn: more than 4.20% and 6.00% or less,', 'P: 0.001% or more and 0.100% or less,', 'S: 0.0200% or less,', 'N: 0.0100% or less, and', 'Ti: 0.005% or more and 0.200% or less, and', Al: 0.01% or more and 2.00% or less,', 'Nb: 0.005% or more and 0.200% or less,', 'B: 0.0003% or more and 0.0050% or less,', 'Ni: 0.005% or more and 1.000% or less,', 'Cr: 0.005% or more and 1.000% or less,', 'V: 0.005% or more and 0.500% or less,', 'Mo: 0.005% or more and 1.000% or less,', 'Cu: 0.005% or more and 1.000% or less,', 'Sn: 0.002% or more and 0.200% or less,', 'Sb: 0.002% or more and 0.200% or less,', 'Ta: 0.001% or more and 0.010% or less,', 'Ca: 0.0005% or more and 0.0050% or less,', 'Mg: 0.0005% or more and 0.0050% or less, and', 'REM: 0.0005% or more and 0.0050% or less,, 'optionally further containing, in mass %, at least one selected from the group consisting of'}, 'with the balance consisting of Fe and inevitable impurities; and, 'a chemical composition containing, in mass %,'} 5% or more and 50% or less of polygonal ferrite,', '10% or more of non-recrystallized ferrite, and', '15% or more and 30% or less of martensite, and', 'that contains, in volume fraction, 12% or more of retained ...

Method of producing metal -coated steel strip

A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the p H of cooling water to be in a range of pH 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 2 to 19, Si: 0.01 to 2, Mg: 1 to 10, and Balance Al and unavoidable impurities. 134-. (canceled)35. A method of forming an Al—Zn—Si—Mg alloy coating on a steel strip including the steps of passing the steel strip through a bath of molten Al—Zn—Si—Mg alloy and thereby dipping the steel strip into the molten alloy and forming a coating of the alloy on exposed surfaces of the steel strip , passing the coated strip through a thickness control station and controlling the thickness of the alloy coating , and cooling the coated strip with cooling water to a temperature range of 28-55° C. , with the cooling step including a water quench step , controlling the pH of cooling water to be in a range of pH 5-9 , and controlling the temperature of cooling water to be in a range of 25-80° C.36. The method defined in wherein the cooling step includes controlling the pH of cooling water to be in the range of 5-8.37. The method defined in wherein the cooling step includes controlling the pH of cooling water to be in the range of 5-7.38. The method defined in wherein the cooling step includes controlling the pH of cooling water to be in the range of 6-8.39. The method defined in wherein the cooling step includes controlling the temperature of cooling water to be less than 70° C.40. The method defined in wherein the cooling step includes controlling cooling water temperature to be greater than 30° C.41. The method defined in wherein the cooling step ...

LEAD-FREE AND SULPHURIC ACID-FREE METHOD FOR GALVANISING METALLIC MATERIALS, AND STEARATE-REMOVING COMPOSITION

The present invention relates to a galvanization process that comprises a residue cleanup step which aims to provide many improvements and facilities to manufacturers and processors of metal wires in general. 1. Process for residue cleanup and galvanization of drawn wire metal materials which eliminates a lead pot bath step , characterized in that it comprises the steps of:drawing the wire with lubricant soap;bathing the drawn wire in a removing bath with a stearate removing composition to remove residues, followed by a sponge set which is made with synthetic fibers, natural fibers or rotating brushes, placed in a strategic position in a removing tank through which the wire to be galvanized passes;rinsing in a tank with water;optionally etching;flushing; andimmersing in a pot with molten zinc, thus finishing the hot dip galvanizing process.2. Process claim 1 , according to claim 1 , characterized in that the removing bath comprises 1 to 15% of diphosphonic hydroxyethylene acid claim 1 , 20 to 40% of potassium hydroxide claim 1 , 1 to 10% of oleic acid claim 1 , 1 to 20% of propylene glycol claim 1 , 1 to 10% of butyl glycol and 0.5 to 3% of silicone antifoam.3. Process claim 2 , according to claim 2 , characterized in that the removing bath is used at a final concentration from 8 to 30% claim 2 , at a working temperature between 25 and 100° C.4. Process claim 1 , according to claim 1 , characterized in that the sponge set claim 1 , made from synthetic fibers claim 1 , natural fibers or rotating brushes claim 1 , is conformed and positioned in such a way to wrap the entire wire surface.5. Process claim 1 , according to claim 1 , characterized in that the flushing step comprises a water bath claim 1 , zinc chloride and ammonium chloride.6. Process claim 1 , according to claim 1 , characterized in that it comprises an oven drying step claim 1 , occurring between the flushing step and the zinc application step.7. Process claim 1 , according to claim 1 , characterized in ...

METHOD FOR PRODUCING HIGH-STRENGTH HOT-DIP GALVANNEALED STEEL SHEET

Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion. 18-. (canceled)9. A method for producing a high-strength hot-dip galvannealed steel sheet , the method comprising:pickling a steel sheet comprising at least one of(i) a pickled hot rolled steel sheet comprising between about 0.02% and about 0.2% of C, between about 0.15% and about 2.5% of Mn, and a balance of Fe and unavoidable impurities, or(ii) an annealed and pickled cold rolled steel sheet;preplating the steel sheet with between about 0.2 g/m2 and about 2.0 g/m2 of Ni without rinsing or drying the steel sheet after the pickling;preparing the steel sheet by heating the steel sheet in at least one of a nonoxidizing atmosphere or a reducing atmosphere to a sheet temperature of 430° C. to 500° C. at a rate of at least about 30° C./sec;hot-dip plating the steel sheet in a galvanizing bath comprising between about 0.05% and about 0.2% of Al;wiping the steel sheet;immediately heating the steel sheet to a temperature between about 470° C. and about 550° C. at a rate of at least about 30° C./sec; andcooling the steel sheet to form the high-strength hot-dip galvannealed ...

HIGH STRENGTH HOT DIP GALVANISED STEEL STRIP

A high strength hot dip galvanised steel strip having, in mass percent, the following elements: 0.13-0.19% C; 1.70-2.50% Mn; max 0.15% Si; 0.40-1.00% Al; 0.05-0.25% Cr; 0.01-0.05% Nb; max 0.10% P; max 0.004% Ca; max 0.05% S; max 0.007% N; and optionally at least one of the following elements: max 0.50% Ti, max 0.40% V, max 0.50% Mo, max 0.50% Ni, max 0.50% Cu, max 0.005% B, the balance being Fe and inevitable impurities; wherein 0.40%1.90%. This steel offers improved formability at a high strength, has a good weldability, and surface quality together with a good producability and coatability. 2. The steel strip according to claim 1 , wherein element C is present in an amount of 0.13-0.16%.3. The steel strip according to claim 1 , wherein element Mn is present in an amount of 1.95-2.40%.4. The steel strip according to claim 1 , wherein element Si is present in an amount of 0.05-0.15%.5. The steel strip according to claim 1 , wherein element Al is present in an amount of 0.60-0.80%.6. The steel strip according to claim 1 , wherein element Cr is present in an amount of 0.10-0.25%.7. The steel strip according to claim 1 , wherein the element Nb is present in an amount of 0.01-0.04%.8. The steel strip according to claim 1 , wherein the hot dip galvanised steel strip has an ultimate tensile strength Rm of at least 750 MPa.9. The steel strip according to claim 1 , wherein the hot dip galvanised steel strip has an 0.2% proof strength Rp of at least 450 MPa.10. The steel strip according to claim 1 , wherein the hot dip galvanised steel strip has a hole expansion coefficient of at least 35% when Rm is 750 MPa and Rp is 450 MPa.11. The steel strip according to claim 1 , wherein the hot dip galvanised steel strip has an Erichsen cupping index of more than 10.5 mm when Rm is 750 MPa and Rp is 450 MPa.12. The steel strip according to claim 1 , wherein the hot dip galvanised steel strip has an average grain size of at most 5 μm.13. A method for producing a ...

FLAT STEEL PRODUCT AND METHOD FOR THE PRODUCTION THEREOF

A flat steel product may have a tensile strength R≥950 MPa, a yield point ≥800 MPa, and an elongation at break A≥8%. The flat steel product may comprise steel consisting of (in percent weight) 0.05%-0.20% C, 0.2%-1.5% Si, 0.01%-1.5% Al, 1.0%-3.0% Mn, ≤0.02% P, ≤0.005% S, ≤0.008% N, and in each case optionally 0.05%-1.0%, 0.05%-0.2% Mo, 0.005%-0.2% Ti, 0.001%-0.05% Nb, 0.0001%-0.005% B, the remainder being Fe and unavoidable impurities. A ratio ψ may conform to 1.5≤ψ≤3 with ψ=(% C+% Mn/5+% Cr/6)/(% Al+% Si), and % C, % Mn, % Cr, % Al, % Si being the respective C, Mn, Cr, Al, and Si contents of the steel. The flat steel product may have a microstructure consisting of (in percent area)≤5% bainite, ≤5% polygonal ferrite, ≥90% martensite, and ≤2% by volume of residual austenite, where at least half the martensite is annealed martensite. 19.-. (canceled)11. The flat steel product of wherein the steel further includes in percent by weight one or more of0.05%-1.0% Cr;0.05%-0.2% Mo;0.005%-0.2% Ti;0.001%-0.05% Nb; or0.0001-0.005% B,wherein a ratio ψ=(% C+% Mn/5+% Cr/6)/(% Al+% Si) conforms to 1.5≤ψ≤3, with % Mn being a respective Mn content of the steel, % Cr being a respective Cr content of the steel, % Al being a respective Al content of the steel, and % Si being a respective Si content of the steel.12. The flat steel product of wherein a sum total of Ti and Nb is at most 0.2% by weight.13. The flat steel product of comprising a carbon equivalent CE=% C+(% Si+% Mn)/5+(% Cr+% Mo)/6 that conforms to 0.254%≤CE≤1.1% by weight claim 11 , with % C being a respective C content of the steel claim 11 , % Si being a respective Si content of the steel claim 11 , % Mn being a respective Mn content of the steel claim 11 , % Cr being a respective Cr content of the steel claim 11 , and % Mo being a respective Mo content of the steel.14. The flat steel product of wherein the carbon equivalent CE is at most 1.0% by weight.15. The flat steel product of wherein a sum total of Si and Al is at ...

Method for Producing a Metallic Coated Steel Sheet

A method for producing a metallic coated steel sheet is provided. The method includes continuously annealing a steel sheet in a continuous annealing furnace and hot dip coating the steel sheet. 124-. (canceled)25. A method for the manufacture of a coated steel sheet comprising the following steps:continuously annealing a steel sheet in a continuous annealing furnace; andhot-dip coating the steel sheet; [{'sub': '2', 'pre-heating the steel sheet at a pressure P1 in a pre-heating section comprising an atmosphere A1 made of at least one inert gas and containing 3.0 vol. % of Hor less, the dew point DP1 of A1 being below −20° C., the pre-heating section comprising at least one opening O1 to allow entry of the steel sheet;'}, {'sub': '2', 'heating the steel sheet in a heating section at a pressure P2, higher than P1, comprising an atmosphere A2 made of at least one inert gas and containing 0.5 vol. % of Hor less, the dew point DP2 of A2 being below −40° C., incoming gas including the at least inert gas being continuously injected in the heating section;'}, {'sub': '2', 'soaking the steel sheet in a soaking section at a pressure P3, lower than P2, comprising an atmosphere A3 made of at least one inert gas and containing 3.0 vol. % of Hor less, the dew point DP3 of A3 being below −40° C., the soaking section comprising at least one opening O3;'}, {'sub': '2', 'cooling the steel sheet at a pressure P4, higher than atmospheric pressure, in a cooling section comprising an atmosphere A4 made of at least one inert gas and including at least 1.0 vol. % of H, the dew point DP4 of A4 being below −30° C.;'}, {'sub': '2', 'optionally, equalizing the steel sheet in an equalizing section at a pressure P5 comprising an atmosphere A5 made of at least one inert gas and including at least 2.0 vol. % of H, the dew point DP5 of A5 being below −30° C., the equalizing section comprising at least one opening O5; and'}, {'sub': '2', 'transferring the steel sheet in a hot bridle section to guide ...

HIGH-STRENGTH GALVANIZED STEEL SHEET EXCELLENT IN BENDABILITY AND MANUFACTURING METHOD THEREOF

The present invention provides a high-strength galvanized steel sheet with maximum tensile strength of 900 MPa or more. The high-strength galvanized steel sheet has an alloyed galvanized layer formed on a surface of a base steel sheet containing predetermined amounts of C, Si, Mn, P, S, Al, N, O with a balance being constituted of iron and inevitable impurities, in which in a structure of the base steel sheet, retained austenite is limited to 8% or less in volume fraction, kurtosis K* of the hardness distribution between 2% hardness and 98% hardness is −0.30 or less, a ratio between Vickers hardness of surface layer of the base steel sheet and Vickers hardness of ¼ thickness of the base steel sheet is 0.35 to 0.70, and a content of iron in the alloyed galvanized layer is 8 to 12% in mass %. 1. A high-strength galvanized steel sheet excellent in bendability with maximum tensile strength of 900 MPa or more , comprising an alloyed galvanized layer formed on a surface of a base steel sheet containing , in mass % ,C: 0.075 to 0.300%,Si: 0.30 to 2.50%,Mn: 1.30 to 3.50%,P: 0.001 to 0.050%,S: 0.0001 to 0.0100%,Al: 0.005 to 1.500%,N: 0.0001 to 0.0100%, andO: 0.0001 to 0.0100% with a balance being constituted of iron and inevitable impurities, wherein:retained austenite is limited to 8% or less in volume fraction in a range of ⅛ thickness to ⅜ thickness of the base steel sheet;when plural measurement regions with a diameter of 1 μm or less are set in the range of ⅛ thickness to ⅜ thickness of the base steel sheet, measurement values of hardness in the plural measurement regions are arranged in an ascending order to obtain a hardness distribution, an integer N0.02 is obtained, which is a number obtained by multiplying a total number of measurement values of hardness by 0.02 and rounding up this number when this number includes a fraction, hardness of a measurement value which is N0.02-th largest from a measurement value of minimum hardness is taken as 2% hardness, an integer ...

HOT-DIP GALVANIZED COLD-ROLLED STEEL SHEET AND PROCESS FOR PRODUCING SAME

A hot-dip galvanized cold-rolled steel sheet has a tensile strength of 750 MPa or higher, a composition consisting, in mass percent, of C: more than 0.10% and less than 0.25%, Si: more than 0.50% and less than 2.0%, Mn: more than 1.50% and 3.0% or less, and optionally containing one or more types of Ti, Nb, V, Cr, Mo, B, Ca, Mg, REM, and Bi, P: less than 0.050%, S: 0.010% or less, sol. Al: 0.50% or less, and N: 0.010% or less, and a main phase as a low-temperature transformation product and a second phase as retained austenite. The retained austenite volume fraction is more than 4.0% and less than 25.0% of the whole structure, and has an average grain size of less than 0.80 □m. A number density of retained austenite grains having a grain size of 1.2 □m or more is 3.0□10/□mor less. 1. A hot-dip galvanized cold-rolled steel sheet having a hot-dip galvanized layer on a surface of a cold-rolled steel sheet , characterized by having a chemical composition comprising , in mass percent , C: more than 0.10% and less than 0.25% , Si: more than 0.50% and less than 2.0% , Mn: more than 1.50% and at most 3.0% , P: less than 0.050% , S: at most 0.010% , sol. Al: at least 0% and at most 0.50% , N: at least 0.010% , Ti: at least 0% and less than 0.040% , Nb: at least 0% and less than 0.030% , V: at least 0% and at most 0.50% , Cr: at least 0% and at most 1.0% , Mo: at least 0% and less than 0.20% , B: at least 0% and at most 0.010% , Ca: at least 0% and at most 0.010% , Mg: at least 0% and at most 0.010% , REM: at least 0% and at most 0.050% , Bi: at least 0% and at most 0.050% , and the remainder being Fe and impurities , andby having a metallurgical structure in which a main phase is a low-temperature transformation product and a second phase contains retained austenite, wherein{'sup': −2', '2, 'the retained austenite has a volume fraction of more than 4.0% to less than 25.0% with respect to a whole structure, and an average grain size of less than 0.80 μm, and in the retained ...

METHOD OF PRODUCING GALVANNEALED STEEL SHEET

A method of producing a galvannealed steel sheet includes: annealing a steel strip by conveying the steel strip through a heating zone including a direct fired furnace, a soaking zone, and a cooling zone in this order in an annealing furnace; hot-dip galvanizing the steel strip discharged from the cooling zone; and heat-alloying a galvanized coating formed on the steel strip. Mixed gas of humidified gas and dry gas is supplied into the soaking zone from at least one gas supply port located in a region of lower ½ of the soaking zone in a height direction so that a dew point measured in a region of upper ⅕ of the soaking zone in the height direction and a dew point measured in a region of lower ⅕ of the soaking zone in the height direction are both −20° C. or more and 0° C. or less. 1. A method of producing a galvannealed steel sheet using a continuous hot-dip galvanizing device that includes: an annealing furnace in which a heating zone including a direct fired furnace , a soaking zone , and a cooling zone are arranged in the stated order; a hot-dip galvanizing line adjacent to the cooling zone; and an alloying line adjacent to the hot-dip galvanizing line , the method comprising:annealing a steel strip by conveying the steel strip through the heating zone, the soaking zone, and the cooling zone in the stated order in the annealing furnace;applying a hot-dip galvanized coating onto the steel strip discharged from the cooling zone, using the hot-dip galvanizing line; andheat-alloying the galvanized coating applied on the steel strip, using the alloying line,wherein reducing gas or non-oxidizing gas is supplied into the soaking zone, the reducing gas or the non-oxidizing gas is mixed gas obtained by mixing gas humidified by a humidifying device and dry gas not humidified by the humidifying device at a predetermined mixture ratio, andthe mixed gas is supplied into the soaking zone from at least one gas supply port located in a region of lower ½ of the soaking zone in a ...

METHOD FOR SELECTIVELY PRETINNING A GUIDEWIRE CORE

A method of pretinning a guidewire core made of shape memory alloy and having an elongate axis, comprising: placing a ball of solder in a pocket in a soldering block; melting the ball of solder; holding a guidewire core over the ball of solder; lowering the guidewire core into the ball of solder; removing the guidewire from the ball of solder. 17-. (canceled)8. A method for pretinning a core wire for a guidewire having an elongate axis , comprising:placing a ball of solder within a crucible in a soldering block;melting the ball of solder to produce a molten ball of solder;placing a quantity of flux in a reservoir, and allowing the flux to migrate by capillary action into a linear groove defined by a beam positioned adjacent the crucible;inserting a first portion of the core wire in the flux; thenmoving the first portion laterally in a first direction; andinserting the first portion of the core wire into the molten ball of solder, while maintaining the core wire in a straight configuration with the elongate axis oriented horizontally.9. The method of claim 8 , wherein moving the first portion laterally in a first direction includes moving the first portion into a position above the molten ball of solder and claim 8 , thereafter claim 8 , lowering the core wire and thereby inserting the first portion into the molten ball of solder.10. The method of claim 8 , wherein maintaining the core wire in a straight configuration with the elongate axis oriented horizontally includes maintaining the core wire within the linear groove on a first side of the crucible claim 8 , and within a grooved support on a second side of the crucible opposite the first side.11. The method of claim 8 , further including claim 8 , moving the core wire laterally in a second direction opposite the first direction claim 8 , thereby moving the first portion out of the molten ball of solder and into the quantity of flux.12. The method of further including claim 11 , moving the core wire laterally in ...

CONTINUOUS ANNEALING FURNACE FOR STEEL STRIP, CONTINUOUS ANNEALING METHOD, CONTINUOUS GALVANIZING APPARATUS AND METHOD FOR MANUFACTURING GALVANIZED STEEL STRIP (AS AMENDED)

Provided is a vertical annealing furnace, in which a heating zone and a soaking zone are communicated with each other in the upper part of the furnace, in which a part of the furnace other than the communicated parts is separated by a dividing wall, in which part of the furnace gas is suctioned into a refiner having a deoxidation device and a dehumidification device which is placed outside the furnace to decrease the dew point of the gas by removing oxygen and moisture from the gas and such that the resultant gas having a decreased dew point is returned into the furnace, in which a gas suction port into the refiner is located in the lower part of the connection part between the soaking zone and the cooling zone and in which one or more gas suction ports are located in the parts of the heating zone and/or the soaking zone outside of an area within 6 m in the vertical direction and 3 m in the longitudinal direction of the furnace from the steel strip entrance in the lower part of the heating zone. 1. A continuous annealing furnace for a steel strip , the furnace being a vertical annealing furnace comprising a heating zone , a soaking zone , and a cooling zone located in this order through which a steel strip is transferred in the up-and-down direction , the connection part between the soaking zone and the cooling zone being located in the upper part of the furnace , the heating zone and the soaking zone being communicated with each other in the upper part of the furnace , a dividing wall being placed in a part of the furnace other than the communicated parts in the upper part of the furnace to physically separate the heating zone and the soaking zone , an atmospheric gas being fed into the furnace from the outside of the furnace , and the furnace gas being discharged through a steel strip entrance in the lower part of the heating zone while a refiner having a deoxidation device and a dehumidification device which is placed outside the furnace such that part of the ...

CONTINUOUS ANNEALING FURNACE FOR ANNEALING STEEL STRIP, METHOD FOR CONTINUOUSLY ANNEALING STEEL STRIP, CONTINUOUS HOT-DIP GALVANIZING FACILITY, AND METHOD FOR MANUFACTURING HOT-DIP GALVANIZED STEEL STRIP (AS AMENDED)

A continuous annealing furnace for annealing steel strips that is a vertical-type annealing furnace is configured so that part of gas inside the furnace is drawn and introduced to a refiner disposed outside the furnace including an oxygen removing apparatus and a dehumidifying apparatus, oxygen and moisture contained in the gas are removed to lower the dew point of the gas, and the gas having a lowered dew point is put back into the furnace. At least one gas inlet through which gas is drawn from the furnace into the refiner is disposed in the vicinity of the entry side of the furnace at a distance of 6 m or less in the vertical direction and 3 m or less in the furnace-length direction from the steel-strip-introduction section located at the lower part of the heating zone. 1. A continuous annealing furnace for annealing steel strips that is a vertical-type annealing furnace comprising a heating zone , a soaking zone , and a cooling zone which are disposed in the annealing furnace in this order and in which the steel strips are transported vertically , the vertical-type annealing furnace being configured so that , while atmosphere gas is supplied from the outside of the furnace into the furnace and gas inside the furnace is exhausted from a steel-strip-introduction section located at the lower part of the heating zone , part of the gas inside the furnace is drawn and introduced to a refiner disposed outside the furnace , the refiner including an oxygen removing apparatus and a dehumidifying apparatus , oxygen and moisture contained in the gas are removed to lower the dew point of the gas , and gas having a lowered dew point is put back into the furnace ,wherein at least one gas inlet through which gas is drawn from the furnace into the refiner is disposed in the vicinity of the entry side of the furnace at a distance of 6 m or less in the vertical direction and 3 m or less in the furnace-length direction from the steel-strip-introduction section located at the lower ...

HIGH STRENGTH GALVANIZED STEEL SHEET EXCELLENT IN TERMS OF COATING ADHESIVENESS AND METHOD FOR MANUFACTURING THE SAME

A high strength galvanized steel sheet excellent in coating adhesiveness is made from a base material that is a high strength steel sheet containing Si, Mn, and Cr. A method includes performing an oxidation treatment on steel containing Si, Mn, and Cr in an oxidation furnace under the condition that a selected exit temperature T, reduction annealing and a galvanizing treatment, or optionally, further an alloying treatment under conditions that heating is performed at a temperature of 460° C. or higher and 600° C. or lower for an alloying treatment time of 10 seconds or more and 60 seconds or less. 1. A method of manufacturing a high strength galvanized steel sheet excellent in terms of coating adhesiveness comprising:performing an oxidation treatment on steel containing Si, Mn, and Cr in an oxidation furnace under a condition that an exit temperature T satisfies expressions below,performing reduction annealing, and [{'br': None, 'i': A=', 'T−', 'T≧, '0.0157.6 (507° C.),'}, {'br': None, 'i': A=', 'T<, '0 (507° C.),'}, {'br': None, 'i': B=', 'T−', 'T≧, '0.00632.8 (445° C.),'}, {'br': None, 'i': B=', 'T<, '0 (445° C.),'}, {'br': None, '[Si]+A×[Cr]≧B,'}, 'where [Si]: Si content of the steel by mass %, and', '[Cr]: Cr content of the steel by mass %., 'performing a galvanizing treatment without performing an alloying treatment2. A method of manufacturing a high strength galvanized steel sheet excellent in terms of coating adhesiveness comprising:performing an oxidation treatment on steel containing Si, Mn, and Cr in an oxidation furnace under a condition that an exit temperature T satisfies expressions below,performing reduction annealing,performing a galvanizing treatment, and [{'br': None, 'i': A=', 'T−', 'T≧, '0.0157.6 (507° C.),'}, {'br': None, 'i': A=', 'T<, '0 (507° C.),'}, {'br': None, 'i': B=', 'T−', 'T≧, '0.00632.8 (445° C.),'}, {'br': None, 'i': B=', 'T<, '0 (445° C.),'}, {'br': None, '[Si]+A×[Cr]≦B,'}, 'where [Si]: Si content of the steel by mass %, and', '[Cr ...

HOT-DIP GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR

Provided are a high-strength hot-dip galvanized steel sheet having excellent formability and a tensile strength of 440 MPa or more and a method for manufacturing the same. A steel sheet has a microstructure containing a ferrite phase having an area fraction of 60% or more, a pearlite phase having an area fraction of 20% to 30%, and a bainite phase having an area fraction of 1% to 5%, the area fraction of a cementite phase present in a grain of the ferrite phase being 5% or less. Upon manufacture, a hot-rolled sheet or a cold-rolled sheet is heated to a temperature of 650° C. or higher at an average heating rate of 10° C./s or more, is held at a temperature of 700° C. to (Ac-5)° C. for ten seconds or more, is cooled to a temperature of 300° C. to 500° C. at an average cooling rate of 10° C./s to 200° C./s, is held at a temperature of 300° C. to 500° C. for 30 seconds to 300 seconds, and is then hot-dip galvanized. 1. A hot-dip galvanized steel sheet comprising a steel sheet having a composition containing 0.100% to 0.200% C , 0.50% or less Si , 0.60% or less Mn , 0.100% or less P , 0.0100% or less S , 0.010% to 0.100% Al , and 0.0100% or less N on a mass basis , the remainder comprising Fe and inevitable impurities , the steel sheet having a microstructure containing a ferrite phase having an area fraction of 60% to 79% , a pearlite phase having an area fraction of 20% to 30% , and a bainite phase having an area fraction of 1% to 5% , the area fraction of a cementite phase present in a grain of the ferrite phase being 5% or less.2. The hot-dip galvanized steel sheet according to claim 1 , wherein the composition of the steel sheet further contains at least one selected from the group consisting of 0.05% to 0.80% Cr claim 1 , 0.005% to 0.100% V claim 1 , 0.005% to 0.500% Mo claim 1 , 0.01% to 0.10% Cu claim 1 , 0.01% to 0.10% Ni claim 1 , and 0.0003% to 0.2000% B on a mass basis.3. The hot-dip galvanized steel sheet according to claim 1 , wherein the composition of ...

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET EXCELLENT IN IMPACT RESISTANCE PROPERTY AND MANUFACTURING METHOD THEREOF, AND HIGH-STRENGTH ALLOYED HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREOF

A base steel sheet has a hot-dip galvanized layer formed on a surface thereof, in which, in a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of a sheet thickness from a surface, a volume fraction of a retained austenite phase is 5% or less, and a total volume fraction of phases of bainite, bainitic ferrite, fresh martensite, and tempered martensite is 40% or more, an average effective crystal grain diameter is 5.0 μm or less, a maximum effective crystal grain diameter is 20 μm or less, and a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed on a surface layer portion, in which a density of oxides dispersed in the decarburized layer is 1.0×10to 1.0×10oxides/m, and an average grain diameter of the oxides is 500 nm or less. 1. A high-strength hot-dip galvanized steel sheet excellent in impact resistance property , comprisinga hot-dip galvanized layer formed on a surface of a base steel sheet containing, by mass %,C: 0.075 to 0.400%,Si: 0.01 to 2.00%,Mn: 0.80 to 3.50%,P: 0.0001 to 0.100%,S: 0.0001 to 0.0100%,Al: 0.001 to 2.00%,O: 0.0001 to 0.0100%,N: 0.0001 to 0.0100%, anda balance composed of Fe and inevitable impurities, wherein:the base steel sheet has a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of a sheet thickness from a surface, in which a volume fraction of a retained austenite phase is 5% or less, and a total volume fraction of a bainite phase, a bainitic ferrite phase, a fresh martensite phase and a tempered martensite phase is 40% or more;an average effective crystal grain diameter and a maximum effective crystal grain diameter in the range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of the sheet thickness from the surface are 5.0 μm or less and 20 μm or less, respectively; and{'sup': 12', '16', '2, 'a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed on a surface layer portion, in which a density of oxides dispersed in ...

Method for Manufacturing a High Strength Steel Sheet having Improved Formability and Sheet Obtained

A method for manufacturing a high-strength sheet having improved formability segregation accord which the chemical composition of the steel contains, in percent by weight: 0.1%≦C≦0.4% 4.2%≦Mn≦8.0% 1%≦Si≦3% 0.2%≦Mo≦0.5% the remainder being Fc and unavoidable impurities, the method comprising the steps of annealing a rolled sheet made of said steel by soaking it at an annealing temperature AT higher than the Ac3 transformation point of the steel, quenching the sheet by cooling it down to a quenching temperature QT between the Ms and Mf transformation points in order to obtain a final structure containing at least 65% of martensite and at least 20% of residual austenite, the sum of the ferrite and bainite contents being less than 10%, heating the sheet up to an overaging temperature PT between 300° C. and 500° C. and maintaining it at said temperature for a time Pt greater than 10s and cooling the sheet down to the ambient temperature. Sheet obtained. 112-. (canceled)13. A method for manufacturing a steel sheet comprising: 0.1%≦C≦0.4%;', '4.5%≦Mn≦5.5%;', '1%≦Si≦3%; and', '0.2%≦Mo≦0.5%;', 'a remainder being Fe and unavoidable impurities;, 'providing a steel having a chemical composition including, in percent by weight{'sub': '3', 'annealing a rolled sheet made of the steel by soaking the rolled sheet at an annealing temperature AT higher than an Actransformation point of the steel;'}quenching the sheet by cooling the sheet down to a quenching temperature QT between Ms and Mf transformation points of the steel in order to obtain a final structure containing at least 50% of martensite and at least 10% of retained austenite, a sum of ferrite and bainite being less than 10%;heating the sheet up to an overaging temperature PT between 300° C. and 500° C. and maintaining the sheet at said overaging temperature PT for an overaging time Pt greater than 10s; andcooling the sheet down to ambient temperature.14. The method according to claim 13 , wherein the chemical composition of ...

MOVEABLE OVERFLOW

An equipment for the continuous hot dip-coating of a metallic strip comprising: an annealing furnace, a tank containing a liquid metal bath, a snout connecting the annealing furnace and said bath, through which the metallic strip runs in a protective atmosphere and the lower part of said snout, the snout tip, is at least partly immersed in the liquid metal bath in order to define with the surface of the bath, and inside this snout, a liquid seal, a moveable support system, on at least one tank side, comprising connecting means, an overflow connected to said moveable support system through said connecting means, comprising at least one vat and at a least one pump. 111- (canceled)12. Equipment for the continuous hot dip-coating of a metallic strip comprising:an annealing furnace;a tank containing a liquid metal bath;a snout connecting the annealing furnace and the bath, the snout including a snout tip at least partly immersed in the liquid metal bath in order to define, with a surface of the bath, and inside the snout, a liquid seal; a core part;', 'a first conveyor able to move the moveable support system at least in the horizontal direction, being on ground and connected to the core part; and', 'a second conveyor connected to the core part and to a moveable support system connector, such that the support system connector is movable at least vertically by the second conveyor;, 'a moveable support system, on at least one side of the tank, includingan overflow, not connected to the snout, including a vat and a pump, being movable to a working position where the vat of the overflow is placed in a vicinity of the snout tip, wherein the overflow is fastened to the moveable support system via the support system connector.13. The equipment as recited in wherein the overflow comprises an overflow core part and the support system connector is connected to the overflow by the overflow core part.14. The equipment as recited in wherein the overflow core part supports the vat and ...

STEEL SHEET HAVING HIGH TENSILE STRENGTH AND DUCTILITY

A hot-rolled steel sheet having a tensile strength greater than 800 MPa and an elongation at break greater than 10% is provided. A composition of the steel includes, the contents being expressed by weight: 0.050%≤C≤0.090%, 1%≤Mn≤2%, 0.015%≤Al≤0.050%, 0.1%≤Si≤0.3%, 0.10%≤Mo≤0.40%, S≤0.010%, P≤0.025%, 0.003%≤N≤0.009%, 0.12%≤V≤0.22%, Ti≤0.005%, Nb≤0.020% and optionally, Cr≤0.45%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. A microstructure of the sheet or part includes, as a surface fraction, at least 80% upper bainite, and a remainder includes lower bainite, martensite and residual austenite. A sum of the martensite and residual austenite, as a surface fraction, is less than 5%. 1. A hot-rolled steel sheet or part comprising:a tensile strength greater than 800 MPa;an elongation at break greater than 10%; [{'br': None, '0.050%≤C≤0.090%;'}, {'br': None, '1.4%≤Mn≤1.8%;'}, {'br': None, '0.015%≤Al≤0.050%;'}, {'br': None, '0.1%≤Si≤0.3%;'}, {'br': None, '0.10%≤Mo≤0.40%;'}, {'br': None, 'S≤0.010%;'}, {'br': None, 'P≤0.025%;'}, {'br': None, '0.003%≤N≤0.009%;'}, {'br': None, '0.12%≤V≤0.22%;'}, {'br': None, 'Ti≤0.005%;'}, {'br': None, 'Nb≤0.020%; and'}, 'a balance of the composition comprising iron and inevitable impurities resulting from the smelting; and, 'a composition of the steel comprising, the contents being expressed by weight at least 80% upper bainite, as a surface fraction;', 'a remainder consisting of lower bainite, martensite and residual austenite; and', 'a sum of the martensite and residual austenite, as a surface fraction, being less than 5%., 'a microstructure of the sheet or part comprising2. The steel sheet or part according to claim 1 , wherein the composition of the steel comprises claim 1 , the content being expressed by weight:{'br': None, '0.050%≤C≤0.070%.'}3. The steel sheet or part according to claim 1 , wherein the composition of the steel comprises claim 1 , the content being expressed by weight:{' ...

SINGLE BATH AUTODEPOSITION COATING FOR COMBINATION METAL SUBSTRATES AND METHODS THEREFOR

This invention relates to an autodeposition bath composition comprising a nitrogen containing compound, said bath being suitable for generating a uniform autodeposition coating on two or more of ferrous, aluminum, magnesium and zinciferous multi-metal substrate surfaces, treated either sequentially or simultaneously. The invention also provides autodeposition concentrate compositions for use in the bath, methods of making and using the concentrate and bath, as well as metal articles comprising an autodeposition coating according to the invention. 1. An autodepositing bath composition comprising: water , an autodepositable polymeric dispersion , a nitrogen compound having one to two nitrogen-oxygen bonds , an activating system , and optionally an oxidizing agent.2. The autodepositing bath composition of wherein the nitrogen compound having one to two nitrogen-oxygen bonds comprises inorganic and/or organic nitrogen compounds having one to two oxygen atoms bonded to an individual nitrogen atom.3. The autodepositing bath composition of wherein claim 2 , the nitrogen compound having one to two nitrogen-oxygen bonds comprises nitrous acid claim 2 , a nitroalcohol claim 2 , and/or a nitroalkane.4. The autodepositing bath composition of wherein the nitrogen compound having one to two nitrogen-oxygen bonds comprises an amine oxide composition represented by the general formula{'br': None, 'sub': '3', 'sup': '+', 'RN()—O(−)'}wherein each “R” independently may represent hydrogen or an organic group, at least one “R” being an organic group and not more than two “R” groups being hydrogen; each organic group independently being a linear, branched or cyclic, aliphatic or aromatic group.5. The autodepositing bath composition of wherein the at least one “R” group being an organic group is selected from an alkane group claim 4 , an alkyl group claim 4 , an amine-substituted alkane group claim 4 , an amine-substituted alkyl group claim 4 , or a heterocyclic group.6. The ...

STEEL SHEET PROVIDED WITH HOT DIP GALVANIZED LAYER EXCELLENT IN PLATING WETTABILITY AND PLATING ADHESION AND METHOD OF PRODUCTION OF SAME

A steel sheet which uses steel sheet which contains the easily oxidizable elements Si and Mn as a base material and which is provided with a hot dip galvanized layer which is excellent in plating wettability and plating adhesion and a method of production of the same are provided. A hot dip galvanized steel sheet which is comprised of a steel sheet having a hot dip galvanized layer A on the surface of the steel sheet, characterized by having the following B layer right under the steel sheet surface and in the steel sheet: 1. A hot dip galvanized steel sheet comprising a steel sheet which contains , by mass % ,C: 0.05% to 0.50%,Si: 0.1% to 3.0%,Mn: 0.5% to 5.0%,P: 0.001% to 0.5%,S: 0.001% to 0.03%,Al: 0.005% to 1.0%, anda balance of Fe and unavoidable impurities, having a hot dip galvanized layer A on the surface of said steel sheet, characterized by having the following B layer right below said steel sheet surface and inside said steel sheet:B layer: Layer which has thickness of 0.001 μm to 0.5 μM, which contains, based on mass of said B layer, one or more of Fe, Si, Mn, P, S, and Al oxides in a total of less than 50 mass %, which contains C, Si, Mn, P, S, and Al not in oxides in:C: less than 0.05 mass %,Si: less than 0.1 mass %,Mn: less than 0.5 mass %,P: less than 0.001 mass %,S: less than 0.001 mass %, andAl: less than 0.005 mass %, andwhich contains Fe not in oxides in 50 mass % or more.2. A hot dip galvanized steel sheet comprising a steel sheet which contains , by mass % ,C: 0.05% to 0.50%,Si: 0.1% to 3.0%,Mn: 0.5% to 5.0%,P: 0.001% to 0.5%,S: 0.001% to 0.03%,Al: 0.005% to 1.0%,one or more elements of Ti, Nb, Cr, Mo, Ni, Cu, Zr, V, W, B, Ca, and REM in respectively 0.0001% to 1%, anda balance of Fe and unavoidable impurities, having a hot dip galvanized layer A on the surface of said steel sheet, characterized by having the following B layer right below said steel sheet surface and inside said steel sheet:B layer: Layer which has thickness of 0.001 μm to 0.5 μ ...

HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREOF

A hot-dip galvanized steel sheet includes: a steel sheet; and a plated layer on a surface of the steel sheet, a microstructure contains, by volume fraction, equal to or more than 20% and equal to or less than 99% in total of one or two of martensite and bainite, a residual structure contains one or two of ferrite, residual austenite of less than 8% by volume fraction, and pearlite of equal to or less than 10% by volume fraction, tensile strength is equal to or greater than 980 MPa, the plated layer is a hot-dip galvanized layer which contains oxides including one or two or more of Si, Mn, and Al, contains equal to or less than 15 mass % of Fe, and a remainder including Zn, Al, and unavoidable impurities, and when a cross section including the steel sheet and the hot-dip galvanized layer is seen in a sheet thickness direction, a projected area ratio is equal to or more than 10% and equal to or less than 90%. 1. A hot-dip galvanized steel sheet comprising:a steel sheet; anda plated layer on a surface of the steel sheet,wherein the steel sheet contains, by mass %,C: equal to or more than 0.05% and less than 0.40%,Si: 0.5% to 3.0%,Mn: 1.5% to 3.0%,O: limited to 0.006% or less,P: limited to 0.04% or less,S: limited to 0.01% or less,Al: limited to 2.0% or less,N: limited to 0.01% or less, andthe remainder including Fe and unavoidable impurities, by volume fraction, equal to or more than 20% and equal to or less than 99% in total of one or two of a martensite and a bainite, and', 'a residual structure including a ferrite, and one or two of a residual austenite of less than 8% by volume fraction, and a pearlite of equal to or less than 10% by volume fraction,, 'wherein a microstructure of the steel sheet contains,'}wherein a tensile strength of the steel sheet is equal to or greater than 980 MPa,wherein the plated layer is a hot-dip galvanized layer which contains oxides including one or two or more of Si, Mn, and Al, contains equal to or less than 15 mass % of Fe, and the ...

METHOD FOR DIP-COATING A METAL STRIP

An equipment for the continuous hot dip-coating of a metal strip including an annealing furnace, a tank containing a liquid metal bath, a snout connecting the annealing furnace and the tank, through which the metal strip runs in a protective atmosphere and the lower part of the snout, the snout tip, is at least partly immersed in the liquid metal bath in order to define with the surface of the bath, and inside this snout, a liquid seal and a separate overflow attached/hold to the snout through fixings, the overflow including at least one tray, placed in the vicinity of the strip when entering the liquid metal bath and encompassed by the liquid seal. 112-. (canceled)13. An equipment for the continuous hot dip-coating of a metal strip comprising:an annealing furnace;a tank containing a liquid metal bath;a snout connecting the annealing furnace and the tank, the metal strip running in a protective atmosphere through the snout, a lower part of the snout defining a snout tip and being at least partly immersed in the liquid metal bath in order to define, with a surface of the bath and an inside of the snout, a liquid seal; anda separate overflow attached to the snout through fixings, the overflow including at least one tray placed where the strip enters the liquid metal bath and is encompassed by the liquid seal.14. The equipment as recited in wherein the fixings are attached on an upper part of the snout.15. The equipment as recited in wherein the tray is formed by: an internal wall facing one side of the strip claim 13 , directed toward a surface of the liquid seal claim 13 , an upper edge of the internal wall positioned below the surface of the bath claim 13 , an external wall facing the snout claim 13 , directed toward the surface of the liquid seal claim 13 , an upper edge of the external wall being positioned above the surface of the bath claim 13 , a connection part between external and internal wall lower edges; and a lateral wall at each side connecting the ...

Method for continuously annealing steel strip and method for manufacturing galvanized steel strip

A steel strip is annealed in a vertical annealing furnace including a heating zone and a soaking zone through which the steel strip is vertically conveyed, an atmosphere gas is supplied into the furnace to form a furnace gas that is discharged from a steel strip entrance at a lower portion of the heating zone, a part of the furnace gas is sucked and discharged into a refiner to form a gas having a lowered dew point that is returned into the furnace. A gas injector having a plurality of gas outlets arranged in a direction of a travel of the steel strip is disposed to suppress a mixing of an atmosphere in the furnace upstream of the gas injector and an atmosphere in the furnace downstream of the gas injector, and a temperature of the steel strip passing through the gas injector is controlled to 600° C. to 700° C.

Method for Producing a High Strength Coated Steel Sheet having Improved Strength, Ductility and Formability

A method for producing a high strength coated steel sheet having a yield stress YS>800 MPa, a tensile strength TS>1180 MPa, and improved formability and ductility. The steel contains: 15%≦C≦0.25%, 1.2%≦Si≦1.8%, 2%≦Mn≦2.4%, 0.1% 23 Cr≦0.25%, Al≦0.5%, the remainder being Fe and unavoidable impurities. The sheet is annealed at a temperature higher than Ac3 and lower than 1000° C. for a time of more than 30 s, then quenched by cooling it to a quenching temperature QT between 250° C. and 350° C., to obtain a structure consisting of at least 60% of martensite and a sufficient austenite content such that the final structure contains 3% to 15% of residual austenite and 85% to 97% of martensite and bainite without ferrite, then heated to a partitioning temperature PT between 430° C. and 480° C. and maintained at this temperature for a partitioning time Pt between 10 s and 90 s, then hot dip coated and cooled to the room temperature. 116-. (canceled)17. A method for producing a high strength coated steel sheet having an improved ductility and an improved formability , the coated steel sheet having a yield strength YS of at least 800 MPa , a tensile strength TS of at least 1180 MPa , a total elongation of at least 14% and a hole expansion ratio HER of at least 30% , comprising the steps of: [{'br': None, '0.15%≦C≦0.25%;'}, {'br': None, '1.2%≦Si≦1.8%;'}, {'br': None, '2%≦Mn≦2.4%;'}, {'br': None, '0.1%≦Cr≦0.25%; and'}, {'br': None, 'Al≦0.5%;'}, 'a remainder being Fe and unavoidable impurities;, 'providing a steel sheet having a chemical composition including in weight %annealing the steel sheet at an annealing temperature TA higher than Ac3 and less than 1000° C. for a time of more than 30 s;quenching the steel sheet by cooling the sheet down to a quenching temperature QT between 250° C. and 350° C., at a cooling speed sufficient to obtain a structure consisting of martensite and austenite just after quenching, with a martensite content of at least 60% and an austenite content ...

Multipurpose Processing Line for Heat Treating and Hot Dip Coating a Steel Strip

A multipurpose continuous processing line able for heat treating and hot dip coating a steel strip comprising: —an annealing section ( 1 ) for heating the steel strip to a predetermined annealing temperature and for maintaining the steel strip at said annealing temperature, —a first transfer section ( 2 ), —an overaging section ( 3 ) able to maintain the temperature of the steel strip between 300° C. and 700° C., —a second transfer section ( 4 ) able to adjust the temperature of the steel strip to allow the hot dip coating of the strip and, —a hot dip coating section ( 5 ), wherein the first transfer section ( 2 ) comprises, in sequence, cooling means ( 21 ) and heating means ( 22 ).

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND SMALL MATERIAL ANISOTROPY WITH ULTIMATE TENSILE STRENGTH OF 980 MPa OR MORE AND MANUFACTURING METHOD THEREFOR

Provided is a high-strength hot-dip galvanized steel sheet having small material anisotropy and excellent formability with an ultimate tensile strength of 980 MPa or more. The hot-dip galvanized steel sheet includes a hot-dip galvanized layer formed on a surface of a base steel plate. The base steel plate contains, by mass %, C: 0.1 to less than 0.40%, Si: 0.5 to 3.0%, Mn: 1.5 to 3.0%, O: limited to 0.006% or less, P: limited to 0.04% or less, S: limited to 0.01% or less, Al: limited to 2.0% or less, N: limited to 0.01% or less, and a balance including Fe and inevitable impurities. A microstructure of the base steel sheet contains ferrite of 40% or more, residual austenite of 8 to less than 60%, by volume fraction, and a balance being bainite or martensite. In a sheet thickness range of ⅝ to ⅜ from the surface of the base steel sheet, a pole density of specific crystal orientation is within a predetermined range. The hot-dip galvanized layer contains Fe: less than 7 mass % and a balance including Zn, Al, and inevitable impurities. 1. A high-strength hot-dip galvanized steel sheet having small material anisotropy and excellent formability with an ultimate tensile strength of 980 MPa or more , the hot-dip galvanized steel sheet comprising a hot-dip galvanized layer formed on a surface of a base steel sheet ,wherein the base steel sheet contains: by mass %,C: 0.1 to less than 0.40%;Si: 0.5 to 3.0%;Mn: 1.5 to 3.0%;O: limited to 0.006% or less;P: limited to 0.04% or less;S: limited to 0.01% or less;Al: limited to 2.0% or less;N: limited to 0.01% or less; anda balance including Fe and inevitable impurities,a microstructure of the base steel sheet contains ferrite of 40% or more, residual austenite of 8 to less than 60%, by volume fraction, and a balance being bainite or martensite,an average value of pole densities of orientation groups {100} <011> to {223} <110> represented by each of crystal orientations {100} <011>, {116} <110>, {114} <110>, {113} <110>, {112} <110>, { ...

Method for continuously annealing steel strip, apparatus for continuously annealing steel strip, method for manufacturing hot-dip galvanized steel strip, and apparatus for manufacturing hot-dip galvanized steel strip

A method for continuously annealing a steel strip includes annealing the steel strip in a vertical annealing furnace, an atmosphere in the furnace being separated by a partition disposed within a space spanning from the heating zone to the soaking zone. An atmosphere gas is supplied from an outside of the furnace into the furnace to form a furnace gas that is discharged from a steel strip entrance at a lower portion of the heating zone, a part of the furnace gas is sucked and discharged into a refiner including a deoxygenator and a dehumidifier such that oxygen and moisture in the part of the furnace gas are removed to form a gas having a lowered dew point, and the gas having a lowered dew point is returned into the furnace. The method further includes controlling a temperature of the steel strip passing through the partition to a range of 550° C. to 700° C.

METHOD AND DEVICE FOR AVOIDING SURFACE DEFECTS CAUSED BY ZINC DUST IN A CONTINUOUS STRIP GALVANISING PROCESS

The invention relates to a method and to an apparatus for avoiding surface defects, which are caused by zinc dust, on galvanized metal strip in continuous strip galvanization, in which metal strip which is to be galvanized and is heated in a continuous annealing furnace is moved through a furnace pipe in protective furnace gas and is immersed into a zinc bath, wherein the furnace pipe is provided with injection openings via which the front side and the rear side of the metal strip can be acted upon with protective furnace gas, and wherein extraction openings for extracting protective furnace gas loaded with zinc vapour are arranged adjacent to the injection openings. The apparatus according to the invention is characterized in that a multiplicity of the injection openings are configured and arranged in the furnace pipe in such a manner that the protective furnace gas streaming out of said injection openings is directed onto that surface of the metal strip which faces the respective injection opening with an angle of impact within the range of 70° to 110°, wherein the distance between the respective injection opening and at least one extraction opening assigned thereto is selected in such a manner that, at a predetermined or predeterminable flow velocity of the protective furnace gas emerging from the respective injection opening, an entraining of protective furnace gas, which occurs during movement of the metal strip, in the direction of the zinc bath is opposed. 1. A method for avoiding surface defects , which are caused by zinc dust , on a galvanized metal strip in continuous strip galvanization , in which the metal strip heated in a continuous annealing furnace is moved through a furnace pipe in protective furnace gas and is immersed into a zinc bath , in which , in the furnace pipe , the upper side and the lower side of the metal strip are acted upon by protective furnace gas via injection openings , and in which protective furnace gas loaded with zinc vapour ...

Method of producing metal-coated steel strip

A method of forming a coating of an Al—Zn—Si—Mg alloy on a steel strip to form an Al—Zn—Mg—Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al—Zn—Si—Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the pH of cooling water to be in a range of pH 5-9. Particular embodiments focus on Al—Zn—Si—Mg alloys that contain the following elements in % by weight: Zn: 2 to 19, Si: 0.01 to 2, Mg: 1 to 10, and Balance Al and unavoidable impurities.

PROCESS FOR MANUFACTURING STEEL SHEET HAVING HIGH TENSILE STRENGTH AND DUCTILITY CHARACTERISTICS, AND SHEET THUS PRODUCED

The invention relates to a hot-rolled steel sheet having a tensile strength greater than 800 MPa and an elongation at break greater than 10%, the composition of which comprises, the contents being expressed by weight: 0.050%≤C≤0.090%, 1%≤Mn≤2%, 0.015%≤Al≤0.050%, 0.1%≤Si≤0.3%, 0.10%≤Mo≤0.40%, S≤0.010%, P≤0.025%, 0.003%≤N≤0.009%, 0.12%≤V≤0.22%, Ti≤0.005%, Nb≤0.020% and, optionally, Cr≤0.45%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the sheet or the part comprising, as a surface fraction, at least 80% upper bainite, the possible complement consisting of lower bainite, martensite and residual austenite, the sum of the martensite and residual austenite contents being less than 5%. 120-. (canceled)22. The manufacturing process as recited in claim 21 , wherein the microstructure does not include any ferrite.23. The manufacturing process as recited in claim 21 , wherein the end of rolling temperature Tis from 870 to 930° C.24. The manufacturing process as recited in claim 21 , wherein the cooling rate Vis from 80 to 150° C./s.25. The manufacturing process as recited in claim 21 , further comprising the step of skin pass rolling the steel sheet.26. The manufacturing process as recited in claim 25 , further comprising the step of coating the steel sheet with zinc claim 25 , zinc alloy claim 25 , aluminum or aluminum alloy.27. The manufacturing process as recited in claim 26 , wherein the step of coating is hot dip coating.28. The manufacturing process as recited in claim 25 , wherein deformation from the skin pass rolling is less than 1%.29. The manufacturing process as recited in claim 21 , further comprising the steps of:cutting the steel sheet to obtain a blank;heating the blank, partially or completely, to a temperature T from 400 to 690° C. for a time less than 15 minutes;drawing the heated blank at a temperature from 350 to T−20° C. to obtain a part; and{'sub': 'C', 'cooling the part ...

METHOD AND AN ARRANGEMENT FOR MANUFACTURING A HOT DIP GALVANIZED ROLLED HIGH STRENGTH STEEL PRODUCT

A method and arrangement for manufacturing hot dip galvanized rolled high strength steel product is presented. The method comprises providing a rolled steel product, heating and annealing the rolled steel product for creating a layer of iron oxide on the surface of the rolled steel product, cooling the rolled steel product, having the iron oxide layer, in a first cooling step to a temperature in a temperature range of 560-600° C. and holding for 3-10 seconds, quenching said rolled steel product, covered with the layer of iron oxide, in a second cooling step by immersing it into a zinc bath comprising aluminium and having a temperature between 440-450° C. for 1-5 seconds and cooling the rolled steel product in a third cooling step to room temperature. An arrangement for implementing the method is also presented. 1. A method for manufacturing hot dip galvanized rolled high strength steel product , said method comprising:providing a rolled steel product;heating the rolled steel product in an oxidizing atmosphere and creating a layer of iron oxide on the surface of the rolled steel product;annealing and holding the rolled steel product in a dry, reducing atmosphere and maintaining a layer of iron oxide, created in the heating step, on the surface of the rolled steel product;cooling the rolled steel product in a first cooling step to a temperature in a temperature range of 560-600° C. and holding for 3-10 seconds;quenching said rolled steel product, covered with the layer of iron oxide, in a second cooling step by immersing it into a zinc bath containing aluminium having a temperature between 440-450° C. for 1-5 seconds;cooling the rolled steel product in a third cooling step to room temperature.2. The method according to claim 1 , wherein the reducing atmosphere comprises claim 1 , in wt %:{'sub': 2', '2, '2-5% H, remaining being N.'}3. The method according to claim 1 , wherein the first cooling step comprises cooling the rolled steel product to a temperature in a ...

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET

A high-strength hot-dip galvanized steel sheet which includes a steel sheet that comprises major components and that contains at least 40 vol. % the sum of bainite and martensite, 8-60 vol. % retained austenite, and less than 40 vol. % ferrite, with the remainder comprising an incidental structure. The hot-dip galvanized steel sheet has, at the interface between the deposit layer formed by hot-dip galvanization and the base steel sheet, an intermetallic compound constituted of Fe, Al, Zn, and incidental impurities and having an average thickness of 0.1-2 μm, the intermetallic compound having a crystal grain diameter of 0.01-1 μm. After the deposit layer formed by hot-dip galvanization was removed, the surface of the base steel sheet has an arithmetic average roughness Ra of 0.1-2.0 μm and gives a roughness curve in which the contour elements have an average length RSm of 5-300 μm. Thus, a high-strength hot-dip galvanized steel sheet which includes a high-strength steel sheet as the base and which has excellent formability that can inhibit cracking or breaking is provided.

ALLOYED HOT-DIP GALVANIZED STEEL SHEET

A high-strength alloyed hot-dip galvanized steel sheet obtained by subjecting the surface of a high-strength steel sheet to alloyed hot-dip galvanization, and formed from a steel sheet containing, in mass %, main components, and containing at least 40 vol % bainite and/or martensite, 8-60 vol % retained austenite, and less than 40 vol % ferrite, with the remainder comprising unavoidable structures. In the alloyed hot-dip galvanized steel sheet, the total thickness of the Gamma1 layer and the Gamma layer (Tgamma1+Tgamma) is 2 μm or less in the alloy layers formed by hot-dip galvanization, and the Gamma1 phase/Gamma phase thickness ratio (Tgamma1/Tgamma) is 1 or less. A tensile strength of 980 MPa or above can be easily imparted to the alloyed hot-dip galvanized steel sheet. The alloyed hot-dip galvanized steel sheet has excellent coating adherence, and coating separation during machining can be suppressed.

MOLTEN Zn-BASED PLATED STEEL SHEET HAVING SUPERIOR CORROSION RESISTANCE AFTER BEING COATED

A hot-dip galvanized steel sheet includes a plated layer formed on at least a part of a surface of a steel sheet, the plated layer containing: Al in a range from 10 mass % to 40 mass %; Si in a range from 0.05 mass % to 4 mass %; Mg in a range from 0.5 mass % to 4 mass %; and the balance consisting of Zn and inevitable impurities. The plated layer has a lamellar structure in which a layered Zn phase and a layered Al phase are alternately arranged in a cross section of the plated layer, the lamellar structure accounting for 5% or more by an area fraction in the cross section, and a total abundance ratio of an intermetallic compound containing at least one of Fe, Mn, Ti, Sn, In, Bi, Pb or B is regulated to 3% or less by the area fraction.

METHOD AND APPARATUS FOR ENVIRONMENTALLY-FRIENDLY BATCH HOT-DIP COATING OF HIGH-PERFORMANCE ALLOY

A method and an apparatus for environmentally-friendly batch hot-dip coating of high-performance alloy are provided. The method is that workpiece is heated to the process temperature in the heating box with inner gas before galvanizing. The heating box body consist of two or three zones, which are waiting zone, heating zone and post-plating turnover zone (the post-plating turnover zone can be omitted). A zinc pot is arranged in the heating zone, and the zinc pot is configured for hot-dip coating. Workpieces can be processed with zinc or zinc-based alloys. A transporting device is configured to successively transport in a sealed state the workpiece to be processed to the waiting zone, the heating zone, the zinc pot, and the post-plating turnover zone (the post-plating turnover zone can be omitted). The new method realizes hot-dip coating with zinc and other zinc-based alloys without the use of the flux. 1. An apparatus for an environmentally-friendly batch hot-dip coating of a high-performance alloy , comprising:a waiting zone, wherein a first confined space is arranged in the waiting zone, and the first confined space is filled with an inert gas;a heating zone, wherein the heating zone is arranged downstream of the waiting zone, a second confined space is arranged in the heating zone and the second confined space is filled with the inert gas, the second confined space is selectively connected to the first confined space, and the second confined space is provided with a heating device, and the heating device is configured for heating a workpiece to be processed;a post-plating turnover zone, wherein the post-plating turnover zone is arranged downstream of the heating zone, a third confined space is arranged in the post-plating turnover zone, and the third confined space is selectively connected to the second confined space; the post-plating turnover zone can be mitted, the workpiece galvanized will be transported out of heating box body and cooling;a zinc pot, wherein ...