ХОЛОДНОКАТАНЫЙ СТАЛЬНОЙ ЛИСТ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к получению холоднокатаного стального листа, используемого в автомобилестроении. Лист изготовлен из стали, содержащей, в мас.%: C: от более чем 0,150 до 0,300, Si: от 0,010 до 1,000, Mn: от 1,50 до 2,70, P: от 0,001 до 0,060, S: от 0,001 до 0,010, N: от 0,0005 до 0,0100, Al: от 0,010 до 0,050 и необязательно один или несколько из следующих элементов: B: от 0,0005 до 0,0020, Mo: от 0,01 до 0,50, Cr: от 0,01 до 0,50, V: от 0,001 до 0,100, Ti: от 0,001 до 0,100, Nb: от 0,001 до 0,050, Ni: от 0,01 до 1,00, Cu: от 0,01 до 1,00, Ca: от 0,0005 до 0,0050 и РЗМ: от 0,0005 до 0,0050, остальное Fe и неизбежные примеси. Металлографическая структура содержит, по относительной площади, от 40% до 90% феррита и от 10% до 60% мартенсита, дополнительно содержит одну или несколько из следующих фаз: 10% или менее перлита по относительной площади, 5% или менее остаточного аустенита по относительному объему и 20% или менее бейнита по относительной площади ...

СТАЛЬНОЙ ЛИСТ, ИМЕЮЩИЙ ВЫСОКУЮ ИНТЕГРАЦИЮ ПЛОСКОСТЕЙ {222}, И СПОСОБ ЕГО ПРОИЗВОДСТВА

Изобретение относится к области металлургии, а именно к производству листовой стали, используемой в автомобильной промышленности и при изготовлении домашних электроприборов. На по меньшей мере одну из поверхностей стального листа, содержащего менее 6,5 мас.% Аl, наносят второй металлический слой, содержащий один или более элемент из Fе, Со, Сu, Cr, Ga, Hf, Hg, In, Mn, Mo, Nb, Ni, Pb, Pd, Pt, Sb, Si, Sn, Та, Ti, V, W, Zn и Zr. Осуществляют холодную прокатку стального листа с нанесенным вторым слоем. Удаляют второй слой и осуществляют термообработку с получением стального листа, имеющего долю интенсивности плоскости {222} одной или обеих фаз αFе и γFе по отношению к поверхности стального листа, равную от 60 до 99%, и/или долю интенсивности плоскости {200} одной или обеих фаз αFе и γFе по отношению к поверхности стального листа, равную от 0,01 до 15%. Лист обладает высокими способностями к глубокой вытяжке, штампуемости и перфорируемости. 12 н. и 16 з.п. ф-лы, 6 табл.

СПОСОБ ОХЛАЖДЕНИЯ МНОГОКОМПОНЕНТНЫМ ХЛАДАГЕНТОМ ДЛЯ СЖИЖЕНИЯ ПРИРОДНОГО ГАЗА

Изобретение относится к сжижению богатого метаном потока сжатого газа, в котором сжижение потока газа происходит в теплообменнике, охлаждаемом холодильной машиной с многокомпонентным хладагентом с замкнутым циклом для производства богатого метаном жидкого продукта, имеющего температуру выше приблизительно -112oС и давление, достаточное для того, чтобы жидкий продукт был в точке начала кипения или ниже нее. Сжиженный газообразный продукт затем помещают в емкость для хранения при температуре выше приблизительно -112oС. Использование изобретения позволит более экономично и эффективно произвести сжижение газа. 3 с. и 18 з.п. ф-лы, 7 табл., 10 ил.

ЛИСТ ИЗ НЕТЕКСТУРИРОВАННОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ С ВЫСОКОЙ ПЛОТНОСТЬЮ МАГНИТНОГО ПОТОКА И ДВИГАТЕЛЬ

Изобретение относится к области металлургии, а именно к листу нетекстурированной электротехнической стали толщиной 0,10-0,50 мм, используемому в качестве материала для сердечника приводного двигателя и электрогенератора. Лист выполнен из стали следующего химического состава, мас.%: C не более 0,010, Si 1,0-7,0, Mn 0,001-3,0, раств. Al 0,0001-3,5, Р 0,01-0,2, S не более 0,010, N не более 0,010, остальное Fe и неизбежные примеси. Отношение (P/Fe) высоты пика PР при энергии электронов 120 эВ к высоте пика FeFe при энергии электронов 700 эВ в дифференциальном спектре оже-электронов, полученном анализом нарушенной поверхности границы зерна оже-спектроскопией, составляет не менее 0,1. Обеспечивается высокая плотность магнитного потока и превосходные потери в железе в области высоких частот. 2 н. и 7 з.п. ф-лы, 5 ил., 3 табл.

СОТОВАЯ СТРУКТУРА, ИСТИРАЕМОЕ УПЛОТНЕНИЕ И СПОСОБЕГО ОБРАЗОВАНИЯ

Истираемое уплотнение предназначено для турбин. Оно содержит новую сотовую ячеистую структуру, изготовленную из металлической фольги или листа, обладающую хорошей технологичностью, облегчающую процесс пайки и имеющую высокую стойкость к окислению и высокую конструкционную целостность после припайки к металлической опорной конструкции. Фольга или листы из сплава MCrAlY (где М - Ni, Fe, Co или их комбинации) особенно хорошо подходят для изготовления такой ячеистой структуры. Такое выполнение истираемого уплотнения позволит повысить его высокую долговременную размерную стабильность при высокой температуре. 3 н. и 10 з.п. ф-лы, 4 ил., 3 табл.

ТРУБА НЕФТЯНОГО СОРТАМЕНТА ХЛАДОСТОЙКАЯ

Изобретение относится к области металлургии, а именно к конструкционным хладостойким сталям, используемым для изготовления труб нефтяного сортамента, в частности для добычи нефти и газа, которые могут эксплуатироваться как в обычных условиях, так и в условиях макроклиматического холода при снижении температуры до минус 60°C. Труба выполнена из подвергнутой закалке и отпуску стали, содержащей углерод, кремний, марганец, алюминий, серу, фосфор, хром, никель, медь, азот, железо и неизбежные примеси, при следующем соотношении компонентов, мас.%: углерод 0,28-0,34, кремний 0,15-0,37, марганец 0,90-1,20, алюминий 0,02-0,05, сера не более 0,010, фосфор не более 0,015, хром не более 0,25, никель не более 0,25, медь не более 0,25, азот не более 0,012, железо и неизбежные примеси, в том числе ванадий, молибден и титан остальное. Труба имеет предел прочности 900 МПа или менее, предел текучести 830 МПа или менее, сопротивление ударным нагрузкам при 0°С не менее 41 Дж и ударную вязкость при -60°С не ...

СПОСОБ ИЗГОТОВЛЕНИЯ СТАЛЬНОЙ ДЕТАЛИ

Изобретение относится к области металлургии, а именно к изготовлению стальной детали из стального листа. Стальной лист имеет состав, включающий в мас.%: С: 0,05-0,25, Mn: 3,5-8, Si: 0,1-2, Аl: 0,01-3, S ≤ 0,010, Р ≤ 0,020, N ≤ 0,008, при необходимости Cr: 0-0,5 и/или Mo: 0-0,25, остальное - железо и неизбежные примеси. Лист имеет микроструктуру, включающую, в долях поверхности, 10-50% остаточного аустенита, 50% или более суммы феррита, бейнита и отпущенного мартенсита, менее 5% свежего мартенсита и менее 2% карбидов. Содержание углерода [C]A в аустените строго более 0,4 и строго менее 0,7 мас.%, а массовый процент азота %N, кремния %Si, марганца %Mn, хрома %Cr, никеля %Ni, меди %Cu, молибдена %Mo и углерода в аустените [C]A, такие, что Md30 находится в диапазоне 200-350°C, причем Md30 определяется как: Md30(°C) = 551 - 462*([C]A +%N) - 9,2*%Si - 8,1*%Mn - 13,7*%Cr - 29*(%Ni+%Cu) - 18,5*(%Mo). Указанный стальной лист разрезают до заданной формы для получения стальной заготовки. Стальную ...

СПОСОБ ПОЛУЧЕНИЯ СТАЛЬНОГО ЛИСТА (ВАРИАНТЫ) И СТАЛЬНОЙ ЛИСТ

Изобретение относится к листам из высокопрочных, свариваемых низколегированных трехфазных сталей с превосходной вязкостью при криогенных температурах и к способу получения листа. Техническим результатом изобретения является повышение вязкости стали и снижение температуры вязко-хрупкого перехода до температуры менее приблизительно -62°С у основной стали в поперечном направлении и в зоне теплового влияния, повышение прочности на разрыв и получение превосходной свариваемости. Сверхпрочную свариваемую низколегированную трехфазную сталь с превосходной вязкостью при криогенных температурах в основном листе и в зоне теплового влияния (HAZ) при сварке, имеющую прочность на разрыв более примерно 830 МПа и микроструктуру, включающую ферритную фазу, вторую фазу преимущественно пластинчатого мартенсита и нижнего бейнита и фазу остаточного аустенита, получают нагревом стального сляба, включающего железо и конкретное весовое содержание некоторых или всех из добавок углерода, марганца, никеля, азота, ...

ОТПУЩЕННАЯ ЛИСТОВАЯ СТАЛЬ С ПОКРЫТИЕМ, ИМЕЮЩАЯ ПРЕВОСХОДНУЮ ДЕФОРМИРУЕМОСТЬ, И СПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к отпущенной листовой стали с покрытием, применяемой для изготовления деталей транспортных средств. Сталь имеет химический состав, содержащий следующие далее элементы, выраженный в мас.%: 0,17 ≤ углерод ≤ 0,25, 1,8 ≤ марганец ≤ 2,3, 0,5 ≤ кремний ≤ 2,0, 0,03 ≤ алюминий ≤ 1,2, сера ≤ 0,03, фосфор ≤ 0,03, при необходимости, по меньшей мере один элемент из: хром ≤ 0,4, молибден ≤ 0,3, ниобий ≤ 0,04 и титан ≤ 0,1, остальное - железо и неизбежные примеси. Микроструктура листовой стали включает в долях площади поверхности от 3 до 20% остаточного аустенита, по меньшей мере 15% феррита, от 40 до 85% отпущенного бейнита и не менее 5% отпущенного мартенсита, причем общее количество отпущенного мартенсита и остаточного аустенита находятся в диапазоне от 10 до 30%. Сталь обладает требуемым уровнем предела прочности, относительного удлинения и коэффициента раздачи отверстия. 5 н. и 8 з.п. ф-лы, 5 табл.

СИСТЕМЫ ХРАНЕНИЯ И ПОДАЧИ ТОПЛИВА В ВИДЕ СЖИЖЕННОГО ПРИРОДНОГО ГАЗА (СПГ-ТОПЛИВА) ДЛЯ ТРАНСПОРТНЫХ СРЕДСТВ, РАБОТАЮЩИХ НА ПРИРОДНОМ ГАЗЕ

Изобретение относится к системам хранения сжиженного природного газа под давлением (СПГД-топлива) от примерно 1035 до примерно 7590 кПа и при температуре от примерно -123 до примерно -62oС и подачи испаряющегося СПГД-топлива для сгорания в двигателе. Системы подачи и хранения топлива имеют резервуары для хранения топлива, которые выполнены из сверхвысокопрочной низколегированной стали, содержащей менее 9 вес.% никеля и имеющей предел прочности при растяжении, превышающий 830 МПа, и температуру перехода от пластичного разрушения к хрупкому ниже, чем примерно -73oС. Изобретение особенно применимо для транспортных средств с двигателями, предназначенными для работы за счет сгорания природного газа. Использование изобретение позволит создать экономичную систему хранения и подачи топлива для сгорания в двигателе автомобиля. 6 с. и 9 з.п. ф-лы, 3 табл., 4 ил.

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 ПОЛУЧЕНИЯ ЛЕНТЫ ИЗ ДВУХФАЗНОЙ СТАЛИ ПОВЫШЕННОЙ ПРОЧНОСТИ

Изобретение относится к области металлургии, в частности для изготовления холодно- или горячекатаной ленты из двухфазной стали повышенной прочности с высокой характеристикой деформируемости, используемой при производстве автомобилей облегченной конструкции. Для обеспечения однородных механических и технологических свойств при изготовлении ленты с изменяющейся толщиной по длине и ширине ее получают из стали, содержащей, вес.%: углерод от 0,1 до 0,16, алюминий от 0,02 до 0,05, кремний от 0,40 до 0,60, марганец 1,5 до 2,0, фосфор меньше или равно 0,020, сера меньше или равно 0,003, азот меньше или равно 0,01, ниобий больше или равно 0,01, ванадий больше или равно 0,02, остальное - железо и присущие стали сопутствующие элементы, при оптимальной добавке титана. Холодно- или горячекатаную стальную ленту подвергают непрерывнму отжигу, при этом ее нагревают в проходной отжигательной печи за одну стадию до температуры от 820 до 1000°С, предпочтительно от 840 до 1000°С, затем охлаждают с температуры ...

СПОСОБ ПРОИЗВОДСТВА ЛИСТА ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ С ОРИЕНТИРОВАННОЙ ЗЕРЕННОЙ СТРУКТУРОЙ

Изобретение относится к области металлургии, а именно к способу производства листа электротехнической стали с ориентированной зеренной структурой, используемого в качестве материала железных сердечников трансформаторов. Проводят горячую прокатку стальной заготовки, имеющей химический состав, мас.%: от 0,030 до 0,100 C, от 0,80 до 7,00 Si, от 0,01 до 1,00 Mn, от 0 до 0,060 в сумме S и Se, от 0,010 до 0,065 кислоторастворимого Al, от 0,004 до 0,012 N, от 0 до 0,30 Cr, от 0 до 0,40 Cu, от 0 до 0,50 P, от 0 до 0,30 Sn, от 0 до 0,30 Sb, от 0 до 1,00 Ni, от 0 до 0,008 B, от 0 до 0,15 V, от 0 до 0,20 Nb, от 0 до 0,10 Mo, от 0 до 0,015 Ti, от 0 до 0,010 Bi, остальное - железо и примеси, с получением горячекатаного стального листа. Полученный лист подвергают отжигу в горячем состоянии, травлению и холодной прокатке. Затем проводят обезуглероживающий отжиг в атмосфере со степенью окисления PH2O/PH2, составляющей 0,01-0,15, при температуре 750-900°C в течение времени выдержки 10-600 с. Наносят сепаратор ...

СПОСОБ ПРОИЗВОДСТВА ЛИСТА ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ С ОРИЕНТИРОВАННОЙ ЗЕРЕННОЙ СТРУКТУРОЙ

Изобретение относится к области металлургии, а именно к способу производства листа электротехнической стали с ориентированной зеренной структурой, используемому в качестве материала железных сердечников трансформаторов. Осуществляют горячую прокатку стальной заготовки, имеющей химический состав, мас.%: от 0,030 до 0,100 C, от 0,80 до 7,00 Si, от 0,01 до 1,00 Mn, от 0 до 0,060 в сумме S и Se, от 0,010 до 0,065 кислоторастворимого Al, от 0,004 до 0,012 N, от 0 до 0,30 Cr, от 0 до 0,40 Cu, от 0 до 0,50 P, от 0 до 0,30 Sn, от 0 до 0,30 Sb, от 0 до 1,00 Ni, от 0 до 0,008 B, от 0 до 0,15 V, от 0 до 0,20 Nb, от 0 до 0,10 Mo, от 0 до 0,015 Ti, от 0 до 0,010 Bi, остальное - железо и примеси, с получением горячекатаного стального листа, который подвергают холодной прокатке. Проводят обезуглероживающий отжиг в атмосфере со степенью окисления PH2O/PH2, составляющей 0,01-0,15, при температуре 750-900°C и времени выдержки 10-600 с. Наносят на лист сепаратор отжига, включающий в себя MgO и MCl, представляющий ...

ЛИСТ ВЫСОКОПРОЧНОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ И СПОСОБ ЕГО ПРОИЗВОДСТВА

Изобретение относится к области производства листа из высокопрочной электротехнической стали. Для получения листа, имеющего предел прочности при растяжении (TS), например, 500 МПА или больше, высокую износостойкость и превосходные магнитные свойства, лист получают из стали, содержащей, мас.%: С - 0,060 или меньше, Si - от 0,2 до 6,5, Мn - от 0,05 до 3,0, Р - 0,30 или меньше, S или Se - 0,040 или меньше, Аl - 2,50 или меньше и N - 0,040 или меньше, необязательно дополнительно один или более ингредиентов из группы: Сu - от 0,001 до 30,0, Nb - от 0,03 до 8,0, Ti - 1,0 или меньше, V - 1,0 или меньше, Zr - 1,0 или меньше, В - 0,010 или меньше, Ni - 15,0 или меньше, Сr - 15,0 или меньше, Bi, Mo, W, Sn, Sb, Mg, Ca, Ce, La и Co - в сумме 0,5 или меньше, остальное - Fe и неизбежные примеси, и имеющей деформированные структуры, остающиеся внутри стального листа. Способ включает этап получения среднего размера d кристаллического зерна в стальном листе непосредственно перед этапом образования деформированных ...

ХОЛОДНОКАТАНЫЙ СТАЛЬНОЙ ЛИСТ С ПОКРЫТИЕМ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

Изобретение относится к области металлургии, а именно к изготовлению холоднокатаного стального листа, используемому в автомобилестроении. Лист имеет следующий далее химический состав, включающий следующие элементы, в мас.%: 0,13 ≤ углерод ≤ 0,18, 1,1 ≤ марганец ≤ 1,8, 0,5 ≤ кремний ≤ 0,9, 0,6 ≤ алюминий ≤ 1,0, 0,002 ≤ фосфор ≤ 0,02, 0 ≤ сера ≤ 0,003, 0 ≤ азот ≤ 0,007, при необходимости один или несколько следующих необязательных элементов: 0,05 ≤ хром ≤ 1,0, 0,001 ≤ молибден ≤ 0,5, 0,001 ≤ ниобий ≤ 0,1, 0,001 ≤ титан ≤ 0,1, 0,01 ≤ медь ≤ 2,0, 0,01 ≤ никель ≤ 3,0, 0,0001 ≤ кальций ≤ 0,005, ванадий ≤ 0,1, бор ≤ 0,003, церий ≤ 0,1, магний ≤ 0,010 и цирконий ≤ 0,010, остальное - железо и неизбежные примеси. Микроструктура указанного стального листа включает в долях площади, от 60 до 75% феррита, от 20 до 30% бейнита, от 10 до 15% остаточного аустенита, и от 0 до 5% мартенсита, причем совокупное содержание остаточного аустенита и феррита составляет между 70% и 80%. Изготовленные листы обладают ...

ЛИСТ АНИЗОТРОПНОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ, СПОСОБ ПРОИЗВОДСТВА ЛИСТА АНИЗОТРОПНОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ И СЕПАРАТОР ОТЖИГА, ИСПОЛЬЗУЮЩИЙСЯ ДЛЯ ПРОИЗВОДСТВА ЛИСТА АНИЗОТРОПНОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ

Изобретение относится к области металлургии, а именно к листу анизотропной электротехнической стали. Лист анизотропной электротехнической стали содержит основной стальной лист, имеющий химический состав, содержащий, в мас.%: C: 0,005 или менее, Si: 2,5-4,5, Mn: 0,02-0,2, один или более элементов, выбранных из группы, состоящей из S и Se: в сумме 0,005 или менее, раств. Al: 0,01 или менее, N: 0,01 или менее, остальное - Fe и примеси, и первичное покрытие, сформированное на поверхности основного стального листа и содержащее Mg2SiO4 в качестве главного компонента. Положение пика интенсивности эмиссии Al, получаемого при выполнении элементного анализа с помощью оптической эмиссионной спектрометрии тлеющего разряда от поверхности первичного покрытия в направлении по толщине листа анизотропной электротехнической стали, находится в диапазоне 2,0-10,0 мкм от поверхности первичного покрытия в направлении по толщине. Численная плотность оксидов Al размером 0,2 мкм или больше в терминах диаметра эквивалентной ...

СТАЛЬНОЙ МАТЕРИАЛ С ВЫСОКОЙ СТОЙКОСТЬЮ К ИНИЦИИРОВАНИЮ ВЯЗКИХ ТРЕЩИН ОТ ЗОНЫ, ПОДВЕРГНУТОЙ ДЕЙСТВИЮ СВАРОЧНОГО ТЕПЛА, И БАЗОВЫЙ МАТЕРИАЛ, А ТАКЖЕ СПОСОБ ИХ ПРОИЗВОДСТВА

Изобретение относится к стальным плитам, используемым для изготовления сварных конструкций, таких как трубопроводы, мосты и архитектурные сооружения, которым необходима структурная безопасность. Сляб, имеющий состав, мас.%: C: от 0,02 до 0,2, Si: от 0,01 до 0,5, Mn: от 0,5 до 2,5, P: 0,05 или менее, S: 0,05 или менее, Al: 0,1 или менее, N: 0,01 или менее и остальное Fe и неизбежные примеси, нагревают до 1000°C или выше. Выполняют прокатку до получения плиты, проводимую таким образом, чтобы степень обжатия прокатки в температурном диапазоне 900°C или выше составляла 50% или более, а конечная температура прокатки была в пределах от точки Arдо Ar-50°C. Начинают охлаждать водой при температуре в пределах от Ar-10°C до Ar-70°C и заканчивают охлаждение водой при 500°C или ниже. Плиты имеют микроструктуру в положении/своей толщины, содержащую феррит в качестве мягкой фазы и бейнит, мартенсит или смешанную бейнит/мартенситную составляющую в качестве твердой фазы, долю по площади твердой фазы от ...

КОНСТРУКЦИОННАЯ ХЛАДОСТОЙКАЯ СТАЛЬ

Использование: в черной металлургии и преимущественно предназначено для использования в производстве конструкционных сталей, эксплуатируемых при повышенных нагрузках и низких температурах. Конструкционная хладостойкая сталь содержит (мас. % ) 0,14 - 0,22 углерода; 0,4 - 0,55 марганца; 0,12 - 0,30 кремния; 0,02 - 0,08 алюминия; 0,006 - 0,01 кальция; 0,003 - 0,005 серы; железо - остальное. Сталь позволит заменить целый класс судостроительных низколегированных дорогих сталей. 1 табл.

СПОСОБ ПРОИЗВОДСТВА ХОЛОДНОКАТАНОГО ПРОКАТА ПОВЫШЕННОЙ ПРОЧНОСТИ

Изобретение относится к области металлургии, конкретно к технологии производства холоднокатаного проката повышенной прочности из низколегированной стали, предназначенного для изготовления деталей автомобиля методом штамповки. Для повышения прочностных характеристик стали при сохранении штампуемости, а также получения стали требуемого класса прочности (класс прочности соответствует требуемому минимальному пределу текучести) способ включает выплавку стали, разливку слябов, горячую прокатку слябов в полосы, охлаждение водой, смотку полос в рулоны, холодную прокатку, рекристаллизационный отжиг в колпаковой печи и дрессировку, при этом выплавляют сталь, содержащую, мас.%: углерод - 0,05-0,10, кремний - не более 0,30, марганец - 0,25-1,20, алюминий - 0,01-0,07, азот - не более 0,009, ниобий и/или титан - 0,01-0,08, железо и неизбежные примеси - остальное, горячую прокатку проводят с температурой конца прокатки 820-875°С, смотку горячекатаных полос ведут при температуре 510-640°С, рекристаллизационный ...

НИТРОЦЕМЕНТИРОВАННАЯ СТАЛЬНАЯ ДЕТАЛЬ С ИНДУКЦИОННОЙ ЗАКАЛКОЙ С ПОВЫШЕННОЙ УСТАЛОСТНОЙ ПРОЧНОСТЬЮ ПОВЕРХНОСТИ ПРИ ВЫСОКОЙ ТЕМПЕРАТУРЕ И СПОСОБ ЕЕ ПРОИЗВОДСТВА

Изобретение относится к области металлургии, а именно к изготовлению стальных деталей, используемых в качестве конструкционных компонентов машин. Используют сталь, содержащую в мас.%: С: 0,005-0,8, Si: 2,0 и менее, Mn: 0,2-3,0, P: 0,03 и менее, S: 0,005-0,10, Ni: 3,0 и менее, включая 0, Сr: 5,0 и менее, включая 0, Мо: 2,0 и менее, включая 0, W: 1,0 и менее, включая 0, В: 0,0050 и менее, включая 0, О: 0,0050 и менее и N: 0,003-0,03, и, кроме того, содержащую один или оба Аl: 0,005-0,2 и Ti: 0,005-0,2 и один или оба V: 0,3 и менее, включая 0, и Nb: 0,3 и менее, включая 0, железо и неизбежные примеси остальное. Подвергают сталь нитроцементации, последующей закалке в масле или соли, последующему индукционному нагреву и закалке водой или полимерным закалочным веществом при температуре менее 40°С. Получают деталь с концентрацией N на поверхности 0,1-0,8 мас.%, суммой концентраций N и С 1,0-2,0% по мас., количеством остаточного аустенита на поверхности менее 15 об.%, глубиной неполностью закаленного ...

ЛИСТ ИЗ НЕТЕКСТУРИРОВАННОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ МАРКИ 600 МПа И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к листу из нетекстурированной электротехнической стали, имеющему предел прочности при растяжении 600 МПа или более и использующемуся в качестве материала для изготовления железных сердечников двигателей или компрессоров. Лист из стали имеет следующий состав, в мас.%: 0<С≤0,0035, Si: 2,0 - 3,5, Mn: 0,4 - 1,2, Р: 0,03 - 0,2, Al: 0,4 - 2,0, при необходимости по меньшей мере один элемент из Sb и Sn при общем содержании 0,003 - 0,2 и при необходимости по меньшей мере один элемент из Mg, Ca и РЗМ при общем содержании 0,0005 - 0,01, остальное - Fe и неизбежные примеси. Лист имеет долю текстуры плоскости {100} ≥ 25% и долю текстуры плоскости {111} ≤ 31%. Лист обладает высокой магнитной индукцией и низкими потерями в железе. 2 н. и 9 з.п. ф-лы, 6 ил., 5 табл.

ХОЛОДНОКАТАНЫЙ И ОТОЖЖЁННЫЙ СТАЛЬНОЙ ЛИСТ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к высокопрочному холоднокатаному и отожженному стальному листу, используемому в качестве материала для изготовления структурных элементов и панелей кузовов транспортных средств. Лист выполнен из стали, имеющей состав, включающий в мас.%: C: 0,03-0,18, Mn: 6,0-11,0, Al: 0,2-3, Mo: 0,05-0,5, B: 0,0005-0,005, S≤0,010, P≤0,020, N≤0,008, при необходимости по меньшей мере один элемент, выбранный из: Si≤1,20, Ti≤0,050, Nb≤0,050, Cr≤0,5 и V≤0,2, остальное - железо и неизбежные примеси, образующиеся при плавке. Лист обладает микроструктурой, содержащей, в долях поверхности, от 25 до 54% остаточного аустенита, от 46 до 75% феррита и от 0 до 8% свежего мартенсита. Количества углерода [C]A и марганца [Mn]A в аустените, выраженные в массовых процентах, удовлетворяют условию [C]A*√[Mn]A, составляющему от 0,48 до 1,8. Неоднородное повторное выделение марганца с областями выше и ниже номинального значения содержания марганца в стальном листе характеризуется ...

ЛИСТ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ С ОРИЕНТИРОВАННОЙ ЗЕРЕННОЙ СТРУКТУРОЙ

Изобретение относится к металлургии, а именно к листу электротехнической стали с ориентированной зеренной структурой, и может быть использовано при производстве сердечников трансформаторов. Лист электротехнической стали с ориентированной зеренной структурой содержит основной стальной лист и стеклянное покрытие, сформированное на поверхности основного стального листа и имеющее покрывающую часть и закрепляющую структуру, входящую в основной стальной лист. Основной стальной лист включает в качестве химического состава в мас.%: 0,010 или меньше C, от 2,00 до 4,00 Si, от 0,05 до 1,00 Mn, от 0,010 до 0,065 или меньше Al, 0,004 или меньше N и 0,010 или меньше S с остатком из Fe и примесей. Концентрация кислорода в стеклянном покрытии и основном стальном листе составляет 2500 частей на миллион или меньше. Профиль концентрации Al, полученный с помощью оптической эмиссионной спектрометрии тлеющего разряда (GDS), имеет по меньшей мере два пика, при этом первый пик, имеющий интенсивность IAl_1 первого ...

НИЗКОПРОЧНЫЙ СТАЛЬНОЙ ЛИСТ ДЛЯ ГОРЯЧЕЙ ШТАМПОВКИ, ГОРЯЧЕШТАМПОВАННЫЙ КОМПОНЕНТ И СПОСОБ ПРОИЗВОДСТВА ГОРЯЧЕШТАМПОВАННОГО КОМПОНЕНТА

Изобретение относится к области металлургии, а именно к низкопрочному стальному листу для горячей штамповки, используемому в автомобилестроении при производстве горячештампованного элемента, имеющего предел прочности TS 500-800 МПа. Стальной лист содержит, мас.%: C: от 0,005% до 0,12%, Si: от 0,50% до 2,0%, Mn: 0,50% или меньше (не включая 0%), Al: от 0,010% до 1,0%, P: 0,1000% или меньше (не включая 0%), S: 0,0100% или меньше (не включая 0%), N: 0,0100% или меньше (не включая 0%), O: 0,0100% или меньше (не включая 0%), необязательно, по меньшей мере один из Ti: 0,10% или меньше, не включая 0%, и Nb: 0,10% или меньше, не включая 0%, остальное - железо и неизбежные примеси. Доля площади феррита на глубине 1/4 толщины стального листа составляет 80% или больше, а точка Ac3 (°C), определяемая по уравнению: Точка Ac3 (°C) = 910 - 203 × [C]1/2 + 44,7 × [Si] - 30 × [Mn] + 700 × [P] + 400 × [Al] + 400 × [Ti], где [C], [Si], [Mn], [P], [Al] и [Ti] представляют собой содержание в стали соответствующих ...

ЛИСТ ИЗ НЕТЕКСТУРИРОВАННОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к листу из нетекстурированной электротехнической стали, используемому в качестве материала для изготовления железных сердечников тяговых двигателей электромобилей. Лист из нетекстурированной электротехнической стали включает следующие химические элементы, мас.%: 0<С≤0,005, Si: 2,0-3,5, Mn: 0,1-2,0, по меньшей мере один элемент из Sn и Sb: 0,003-0,2, Al: 0,2-1,8, остальное - Fe и неизбежные примеси, при этом указанный лист содержит включения MnS и Cu2S, имеющие размер 150-500 нм. Лист обладает низкими потерями в железе и низкой магнитной анизотропией на высоких частотах. 2 н. и 8 з.п. ф-лы, 6 ил., 2 табл.

ХОЛОДНОКАТАНЫЙ ОТОЖЖЁННЫЙ СТАЛЬНОЙ ЛИСТ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к холоднокатаному и отожженному высокопрочному стальному листу, используемому в автомобильной промышленности. Лист выполнен из стали, имеющей состав, включающий в мас.%: C 0,03-0,18, Mn 6,0–11,0, Al 0,2–3, Mo 0,05–0,5, B 0,0005–0,005, S≤0,010, P≤0,020, N≤0,008, при необходимости по меньшей мере один элемент, выбранный из: Si≤1,20, Ti≤0,050, Nb≤0,050, Cr≤0,5 и V≤0,2, остальное - железо и неизбежные примеси, образующиеся при плавке. Стальной лист обладает микроструктурой, заключающей в себе, в долях поверхности, от 25 до 55% остаточного аустенита, от 45 до 75% феррита, от 0 до 5% свежего мартенсита. Содержание углерода [C]A и марганца [Mn]A в аустените, выраженное в мас.%, такое, что отношение ([C]A×[Mn]2A)/(C%×Mn%) составляет от 19,0 до 41,0 мас.%, при этом C% и Mn% представляют собой номинальные значения содержания углерода и марганца в стальном листе в мас.%. Плотность карбидов в микроструктуре составляет менее 3×106/мм2 и неоднородное ...

ЛИСТ ИЗ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ С ОРИЕНТИРОВАННОЙ ЗЕРЕННОЙ СТРУКТУРОЙ

Изобретение относится к области металлургии, а именно к листу электротехнической стали с ориентированной зеренной структурой, используемому в качестве материала железного сердечника для электрического оборудования, например трансформатора. Электротехнический лист содержит основной стальной лист, стеклянную пленку, находящуюся в контакте с основным стальным листом, и изолирующее покрытие, находящееся в контакте со стеклянной пленкой и содержащее в качестве основных компонентов фосфат и коллоидный оксид кремния. Основной стальной лист имеет химический состав, мас.%: 0,085 или менее С, 0,80-7,00 Si, 0,05-1,00 Mn, 0,010-0,065 растворимого в кислоте Al, 0,012 или менее N, 0,015 или менее Seq, где Seq=S+0,406×Se, 0,0005-0,0080 В, остальное - Fe и примеси. В области, проходящей от границы между стеклянной пленкой и изолирующим покрытием в направлении по толщине на расстояние 5 мкм к основному стальному листу, содержится BN, имеющий средний размер частиц 50-300 нм и численную плотность 2×106-2× ...

ВЫСОКОПЛАСТИЧНАЯ НИЗКОУГЛЕРОДИСТАЯ СТАЛЬ

Изобретение относится к области металлургии стали и может быть использовано при производстве катанки с повышенными пластическими свойствами. Сталь содержит компоненты в следующем соотношении, мас.%: углерод 0,01-0,06, марганец от 0,10 до менее 0,30, кремний до менее 0,01, фосфор не более 0,020, сера от более 0,003 до не более 0,015, хром не более 0,10, никель не более 0,10, медь не более 0,15, алюминий 0,005-0,015, кальций 0,0001-0,005, азот не более 0,008, железо остальное. Обеспечивается требуемая величина относительного сужения поперечного сечения после разрыва. 1 пр.

СВАРОЧНАЯ ПРОВОЛОКА ИЗ НИЗКОУГЛЕРОДИСТОЙ ЛЕГИРОВАННОЙ СТАЛИ

Изобретение относится к области металлургии, а именно к стали, используемой при производстве сварочной проволоки. Сталь содержит компоненты при следующем соотношении, в мас.%: углерод 0,05-0,08, марганец 1,60-2,30, кремний 0,60-0,95, фосфор не более 0,015, сера не более 0,010, хром до менее 0,10, никель до менее 0,10, медь не более 0,15, кальций 0,0001-0,005, бор 0,0005-0,004, алюминий 0,010-0,030, азот не более 0,010, железо остальное. Отношение содержания бора к сумме содержаний углерода и азота составляет 0,02-0,09. Обеспечивается требуемый предел прочности, пластичность и вязкость сварного шва, а также пониженная прочность и высокая пластичность катанки, что обеспечивает ее переработку без предварительного и промежуточного отжига. 1 пр.

ОЦИНКОВАННЫЙ СТАЛЬНОЙ ЛИСТ ДЛЯ ГОРЯЧЕЙ ШТАМПОВКИ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

Изобретение относится к области металлургии, а именно к оцинкованному стальному листу, используемому для изготовления автомобильных деталей методом горячей штамповки. Оцинкованный стальной лист содержит стальную подложку и плакирующий слой, сформированный на поверхности стальной подложки путем выдержки подложки, представляющей собой холоднокатаный стальной лист, при температуре от 500 до 720°С в течение от 90 до 400 секунд в восстановительной атмосфере с температурой точки росы от -20 до 0°С и затем плакирования. Стальная подложка содержит, в мас.%: С: от 0,10 до 0,5, Si: от 0,7 до 2,5, Mn: от 1,0 до 3, Al: от 0,01 до 0,5, необязательно B: 0,005 или менее, исключая 0%, остальное - количество составляют железо и неизбежные примеси. Стальная подложка имеет внутри нее внутренний оксидный слой, содержащий оксид по меньшей мере одного из Si и Mn, имеющий толщину 1 мкм или более, и обезуглероженный слой, имеющий толщину 20 мкм или менее, от поверхности раздела с плакирующим слоем по направлению ...

ХОЛОДНОКАТАНАЯ И ОТОЖЖЕННАЯ ЛИСТОВАЯ СТАЛЬ, СПОСОБ ЕЕ ПРОИЗВОДСТВА И ИСПОЛЬЗОВАНИЕ ТАКОЙ СТАЛИ ДЛЯ ПРОИЗВОДСТВА ДЕТАЛЕЙ ТРАНСПОРТНЫХ СРЕДСТВ

Изобретение относится к области металлургии, а именно к холоднокатаной и отожженной листовой стали, используемой для изготовления деталей обеспечения безопасности или конструкционных деталей транспортных средств. Сталь содержит, мас.%: 0,6 < C < 1,3%, 15,0 ≤ Mn < 35%, 6,0 ≤ Al < 15%, Si ≤ 2,40%, S ≤ 0,015%, P ≤ 0,1%, N ≤ 0,1%, при необходимости, по меньшей мере один из Ni, Cr и Cu до 3% каждого и, при необходимости, по меньшей мере один из B, Ta, Zr, Nb, V, Ti, Mo и W в сумме до 2,0%, остальное - железо и неизбежные примеси. Микроструктура стали содержит, по меньшей мере, 0,1% внутризеренных каппа-карбидов, необязательно вплоть до 10% зернистого феррита, при этом остаток образован из аустенита. По меньшей мере 80% каппа-карбидов характеризуются средним размером, составляющим менее чем 30 нм. Средний размер зерен и среднее соотношение сторон зерен аустенита, соответственно, составляют менее, чем 6 мкм, и от 1,5 до 6, а средний размер зерен и среднее соотношение сторон зерен феррита в случае ...

КОВАННАЯ ВХОЛОДНУЮ СТАЛЬ ДЛЯ ЗУБЧАТЫХ КОЛЁС И СПОСОБ ЕЁ ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к получению стали для холоднокованых зубчатых колёс. Осуществляют плавку и литьё стали, которая помимо Fe и неизбежных примесей содержит следующие химические элементы в мас.%: 0,15-0,17 C, 0,10-0,20 Si, 1,0-1,10 Mn, 0,80-0,90 Cr и 0,02-0,04 Al. Сталь нагревают и проводят ковку или прокатку, а затем проводят сфероидизирующий отжиг путем нагрева и выдержки при 750-770°С, затем охлаждения со скоростью охлаждения 5-15°С/ч до 700-720°С и выдержки при указанной температуре, охлаждения со скоростью охлаждения 3-12°С/ч. до 660-680°С и выдержки, охлаждения со скоростью охлаждения 5-20°С/ч до 500°С или ниже, а затем выгрузки и охлаждения. Сталь имеет прокаливаемость, удовлетворяющую требованиям: J1.5: 38-42 HRC, J3: 35-39 HRC, J5: 30-34 HRC, J7: 26-30 HRC и J9: 21-25 HRC, причем указанная прокаливаемость каждая имеет диапазон 4 HRC или менее. 2 н. и 8 з.п. ф-лы, 2 ил., 4 табл.

ЛИСТ АНИЗОТРОПНОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ И СПОСОБ ЕГО ПРОИЗВОДСТВА

Изобретение относится к области металлургии, а именно к листу анизотропной электротехнической стали, используемому в качестве материала железных сердечников трансформаторов. Лист электротехнической стали включает в себя основной стальной лист, стеклянное покрытие, сформированное на основном стальном листе, и придающее натяжение изоляционное покрытие, сформированное на стеклянном покрытии. Основной стальной лист имеет химический состав в мас.%: С: 0,010 или менее, Si: 3,00-4,00, Mn: 0,01-0,50, N: 0,010 или менее, раств. Al: 0,020 или менее, Р: 0,030 или менее, S: 0,010 или менее, Sn: 0-0,50, Cu: 0-0,50, Cr: 0-0,50, Se: 0-0,020, Sb: 0-0,500, Mo: 0-0,10, остальное - Fe и примеси. На передней поверхности основного стального листа присутствует множество линейных деформаций, простирающихся непрерывно или прерывисто в направлении, пересекающемся с направлением прокатки, причем интервалы р в направлении прокатки множества смежных друг с другом линейных деформаций составляют 3,0-9,0 мм, а ширины ...

ГОРЯЧЕКАТАНЫЙ СТАЛЬНОЙ ЛИСТ С ОЧЕНЬ ВЫСОКОЙ ПРОЧНОСТЬЮ И НИЗКИМ УДЕЛЬНЫМ ВЕСОМ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

... 1. Горячекатаный стальной лист с очень высокой прочностью и низким удельным весом, отличающийся тем, что он содержит 0,04 вес.% ≤ углерода ≤0,5 вес.%, 0,05 вес.% ≤ марганца ≤3 вес.%, а также при необходимости следующие упрочняющие элементы: 0,01 вес.% ≤ ниобия ≤0,1 вес.%, 0,01 вес.% ≤ титана ≤0,2 вес.%, 0,01 вес.% ≤ ванадия ≤0,2 вес.%, взятые раздельно или в сочетании, и при необходимости элементы, воздействующие на температуру превращения: 0,0005 вес.% ≤ бора ≤0,005 вес.%, 0,05 вес.% ≤ никеля ≤2 вес.%, 0,05 вес.% ≤ хрома ≤2 вес.%, 0,05 вес.% ≤ молибдена ≤1 вес.%, взятые раздельно или в сочетании, остальное железо и технологические примеси, что он также содержит 2 вес.% ≤ кремния ≤10 вес.% 1 вес.% ≤ алюминия ≤10 вес.% и что стальной лист имеет микроструктуру, образованную первичной и вторичной ферритными фазами, при этом средний размер зерна феррита первичной фазы превышает средний размер зерна феррита вторичной фазы, причем микроструктура содержит также карбидные фазы. 2. Стальной лист ...

ОТПУЩЕННАЯ ЛИСТОВАЯ СТАЛЬ С ПОКРЫТИЕМ, ИМЕЮЩАЯ ПРЕВОСХОДНУЮ ДЕФОРМИРУЕМОСТЬЮ, И СПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

УСТОЙЧИВАЯ К ОКИСЛЕНИЮ И КОРРОЗИИ АУСТЕНИТНАЯ НЕРЖАВЕЮЩАЯ СТАЛЬ, СОДЕРЖАЩАЯ МОЛИБДЕН

... 1. Аустенитная нержавеющая сталь, содержащая, по массе, от 19 до 23% хрома, от 30 до 35% никеля, от 1 до 6% молибдена и менее 0,8% кремния. 2. Аустенитная нержавеющая сталь по п.1, содержащая, по массе, от 2 до 4% молибдена. 3. Аустенитная нержавеющая сталь по п.1, содержащая, по массе, от 0 до 0,1% углерода, от 0 до 1,5% марганца, от 0 до 0,05% фосфора и от 0 до 0,02% серы. 4. Аустенитная нержавеющая сталь по п.1, содержащая, по массе, от 2 до 4% молибдена, от 0,15 до 0,6% титана и от 0,15 до 0, 6% алюминия. 5. Аустенитная нержавеющая сталь по п.4, содержащая, по массе, от 0 до 0,1% углерода, от 0 до 1,5% марганца, от 0 до 0,05% фосфора и от 0 до 0,02% серы. 6. Аустенитная нержавеющая сталь, состоящая по существу из, по массе, от 19 до 23% хрома, от 30 до 35% никеля, от 1 до 6% молибдена, от 0 до 0,1% углерода, от 0 до 1,5% марганца, от 0 до 0,05% фосфора, от 0 до 0,02% серы, менее 0,8% кремния, от 0,15 до 0,6% титана, от 0,15 до 0,6% алюминия, от 0 до 0,75% меди, железа и неизбежных примесей ...

УДАРОПРОЧНАЯ И СТОЙКАЯ К РАЗРЫВУ СТАЛЬ ДЛЯ КОНСТРУКЦИИ КОРПУСА СУДНА И СПОСОБ ЕЁ ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к ударопрочной и стойкой к разрыву листовой стали для конструкции корпуса судна. Сталь содержит, мас.%: C: 0,06-0,12, Si: 0,05-0,60, Mn: 1,50-1,70, Al: 0,01-0,06, Ti: 0,005-0,012, Mg: 0,0005-0,003, 0 Подробнее

СРЕДНЕУГЛЕРОДИСТАЯ СТАЛЬ ПОВЫШЕННОЙ ОБРАБАТЫВАЕМОСТИ РЕЗАНИЕМ

Изобретение относится к стали, используемой, например, при изготовлении штоков амортизаторов автомобилей. Сталь повышенной обрабатываемости резанием содержит компоненты в следующем соотношении, в мас.%: углерод 0,42-0,50; марганец 0,50-0,80; кремний 0,17-0,37; сера 0, 020-0,040; фосфор 0,001-0,030; алюминий 0,03-0,05; кальций 0,001-0,010; кислород 0,001-0,015; железо и неизбежные примеси - остальное. При этом выполняются следующие зависимости: кислород/кальций= 1÷4,5 и кальций/сера ≥0,065. Сталь в качестве примесей дополнительно содержит в мас.%: хром не более 0,25; никель не более 0,25; медь не более 0,25; молибден не более 0,10; мышьяк не более 0,08; фосфор не более 0,035; азот не более 0,015, а неметаллические включения имеют двухслойную структуру - сульфид с оксидной оболочкой. Техническим результатом является повышение обрабатываемости резанием, обеспечение сквозной прокаливаемости сортового проката диаметром до 20 мм. 2 з.п. ф-лы, 2 табл.

СТАЛЬ

Сталь, содержащая углерод, кремний, марганец, бор, ванадий, алюминий, магний, церий, железо, отличающаяся тем, что дополнительно содержит фосфор, титан и медь при следующем соотношении компонентов, мас.%: углерод 0,3-0,5; кремний 0,2-0,6; марганец 0,4-0,8; бор 0,1-0,3; ванадий 0,1-0,2; алюминий 0,1-0,2; магний 0,05-0,1; церий 0,1-0,3; фосфор 0,1-0,2; титан 0,5-1,0; медь 2,0-3,0, железо - остальное.

НЕТЕКСТУРИРОВАННАЯ КРЕМНИСТАЯ СТАЛЬ И СПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к получению нетекстурированной кремнистой стали для сердечников роторных устройств и электростатических машин. Выплавляют сталь с получением литого сляба, содержащего следующие компоненты, мас.%: С≤0,005, 0,1≤Si≤2,5, Al≤1,5, 0,10≤Mn≤2,0, Р≤0,2, S≤0,005, N≤0,005, Nb+V+Ti≤0,006 и остальное - Fe и неизбежные примеси. При выплавке стали осуществляют циркуляционно-вакуумное рафинирование с реализацией декарбонизации и раскисления в указанном циркуляционно-вакуумном рафинировании с использованием раскислителя, исходное количество которого Y удовлетворяет следующему выражению: Y=K×m×([O]-50), где [О] - содержание свободного кислорода в единицах частей на млн после завершения декарбонизации, K - коэффициент, обозначающий раскислительную способность раскислителя, имеющий значения в диапазоне от 0,35×10до 1,75×10, m - масса расплавленной стали, содержащейся в сталеразливочном ковше в тоннах. Проводят горячую прокатку литого сляба с получением ...

СТАЛЬ

Сталь, содержащая углерод, марганец, алюминий и железо, отличающаяся тем, что, с целью повышения механических свойств после длительной выдержки при температурах до 650°С, она дополнительно содержит стронций при следующем соотношении компонентов, мас.%: Углерод 0,6 - 0,8 Марганец 28,0 - 35,0 Алюминий 8,0 - 10,0 Стронций 0,07 - 0,20 Железо Остальное ...

ЛИГАТУРА ДЛЯ СТАЛИ

Изобретение относится к области металлургии, в частности к производству жаростойких нейтронопоглощающих сталей, применяемых в атомной энергетике. Лигатура содержит, % мас.: гадолиний 41-74, алюминий 14,0-25,4, кремний 0,6-20, железо остальное. Изобретение позволяет уменьшить в стали содержание неметаллических включений и интерметаллидов, повысить механические свойства и коррозионную стойкость стали за счет лучшего усвоения гадолиния. 1 пр., 5 табл.

РУЛОННЫЙ ПРОКАТ ДЛЯ ОБСАДНЫХ И НАСОСНО-КОМПРЕССОРНЫХ ТРУБ И СПОСОБ ЕГО ПРОИЗВОДСТВА

Изобретение относится к металлургии, а именно к производству рулонного проката толщиной 4-20 мм для изготовления высокопрочных насосно-компрессорных и обсадных труб, преимущественно малого диаметра, эксплуатируемых в агрессивных средах, содержащих сероводород и углекислый газ. Прокат выполнен из стали следующего химического состава, мас.%: углерод 0,27-0,40, марганец 1,0-1,5, кремний 0,30-0,80, алюминий 0,02-0,06, хром не более 0,08, никель не более 0,08, медь не более 0,08, ванадий не более 0,01, ниобий не более 0,01, титан не более 0,01, молибден не более 0,01, кальций не более 0,005, азот не более 0,008, сера не более 0,005, фосфор не более 0,012, железо и неизбежные примеси – остальное, при этом значение углеродного эквивалента, рассчитываемое по выражению С=С+Mn/6, составляет в диапазоне от 0,47 до 0,63. Прокат имеет феррито-перлитную микроструктуру, содержащую феррит полиэдрической морфологии с низкой плотностью дислокаций и перлит равновесной морфологии, доля перлита составляет не ...

ХОЛОДНОКАТАНЫЙ СТАЛЬНОЙ ЛИСТ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

Изобретение относится к области металлургии, а именно к холоднокатаному стальному листу, используемому в автомобилестроении. Лист изготовлен из стали, содержащей в мас.%: С от 0,01 до 0,4, Si от 0,001 до 2,5, Mn от 0,001 до 4,0, Al от 0,001 до 2,0, P 0,15 или менее, S 0,03 или менее, N 0,01 или менее, O 0,01 или менее, Fe и неизбежные примеси остальное. Средняя полюсная плотность ориентационной группы от {100}<011> до {223}<110> составляет от 1,0 до 5,0, а полюсная плотность ориентации кристалла {332}<113> составляет от 1,0 до 4,0 на центральном участке толщины, в диапазоне толщины от 5/8 до 3/8 от основания поверхности стального листа. Величина rC Лэнкфорда в направлении, перпендикулярном направлению прокатки, составляет от 0,70 до 1,50, а величина r30 Лэнкфорда в направлении под углом 30° к направлению прокатки составляет от 0,70 до 1,50. Структура листа состоит из: от 30% до 99% феррит и бейнит, от 1% до 70% мартенсит. Обеспечиваются повышенные равномерная и локальная деформируемости ...

Способ выплавки с направленной кристаллизацией магнитного сплава системы Fe-Al-Ni-Co

Изобретение относится к области металлургии, а именно к технологии производства магнитных сплавов системы железо-алюминий-никель-кобальт, применяемых для получения постоянных магнитов электродвигателей и навигацинных устройств. Способ включает размещение поликристаллической заготовки из сплава на затравке в керамической форме, размещение керамической формы в области нагревателя над охладителем и проведение процесса направленной кристаллизации сплава при наличии температурного градиента перед фронтом кристаллизации, при этом поликристаллическую заготовку из сплава предварительно расплавляют и повышают ее температуру до 1580-1620°С, расплавленную поликристаллическую заготовку заливают в подогретую до температуры 1500-1600°С керамическую форму, выдерживают в ней 0,5-1 мин и проводят процесс направленной кристаллизации сплава посредством перемещения керамической формы в жидкометаллический охладитель с температурой 300-320°С со скоростью 1-5 мм/мин в условиях температурного градиента на фронте ...

РЕЛЬС

Изобретение относится к высокопрочному рельсу. Для обеспечения устойчивости рельса к замедленному разрушению в рельсе 95% или более структуры в той поверхностной части головки рельса, которая простирается от поверхностей угловых частей головки рельса и верхней части головки рельса на глубину 20 мм, является бейнитной или перлитной структурой, и эта структура содержит от 20 до 200 сульфидов на основе сульфида марганца, сформированных вокруг оксида на основе алюминия в качестве ядра и имеющих размер в диапазоне от 1 мкм до 10 мкм на квадратный миллиметр в области наблюдения в горизонтальном поперечном сечении рельса. 3 з.п. ф-лы, 6 ил., 6 табл.

ЭКОНОМНОЛЕГИРОВАННАЯ КОНСТРУКЦИОННАЯ СТАЛЬ

Изобретение относится к области металлургии, а именно к экономнолегированной конструкционной стали, предназначенной для изготовления металлических конструкций. Сталь содержит, мас.%: углерод 0,14-0,16, марганец 0,25-0,29, кремний 0,17-0,22, азот 0,009-0,014, алюминий 0,029-0,043, железо и водород - остальное. Отношение алюминий/азот составляет 2,5-3,5, а отношение азот/водород составляет не более 30. Повышаются механические свойства стали. 2 табл., 1 пр.

ГОРЯЧЕШТАМПОВАННАЯ СТАЛЬ, ХОЛОДНОКАТАНЫЙ СТАЛЬНОЙ ЛИСТ И СПОСОБ ПРОИЗВОДСТВА ГОРЯЧЕШТАМПОВАННОЙ СТАЛИ

ВЫСОКОПРОЧНЫЙ СТАЛЬНОЙ ЛИСТ - СТАЛЬНОЙ ЛИСТ И ВЫСОКОПРОЧНЫЙ ГАЛЬВАНИЗИРОВАННЫЙ СТАЛЬНОЙ ЛИСТ, ОБЛАДАЮЩИЕ ПРЕВОСХОДНОЙ СТАБИЛЬНОСТЬЮ ФОРМЫ, И СПОСОБ ИХ ПРОИЗВОДСТВА

... 1. Высокопрочный стальной лист, обладающий превосходной стабильностью формы, содержащий:в % мас.,C: от 0,075% до 0,300%,Si: от 0,30% до 2,5%,Mn: от 1,3% до 3,50%,P: от 0,001% до 0,030%,S: от 0,0001% до 0,0100%,Al: от 0,080% до 1,500%,N: от 0,0001% до 0,0100,O: от 0,0001% до 0,0100; иостаток, состоящий из железа и неизбежных примесей, в котором:структура стального листа содержит от 5% до 20% в объемной доле фазы остаточного аустенита в диапазоне от 1/8 толщины до 3/8 толщины стального листа; причемколичество углерода в твердом растворе, содержащегося в фазе остаточного аустенита, составляет от 0,80% до 1,00% в % мас.;значение W, определяемое как количество кремния в твердом растворе, содержащегося в фазе остаточного аустенита, в 1,10 раза или больше превосходит значение W, определяемое как среднее количество кремния в диапазоне от 1/8 толщины до 3/8 толщины стального листа;значение W, определяемое как количество марганца в твердом растворе, содержащегося в фазе остаточного аустенита, в 1,10 ...

АУСТЕНИТНАЯ СТАЛЬ, ИМЕЮЩАЯ ВЫСОКУЮ ПРОЧНОСТЬ И ФОРМУЕМОСТЬ, СПОСОБ ПОЛУЧЕНИЯ УПОМЯНУТОЙ СТАЛИ И ЕЕ ПРИМЕНЕНИЕ

... 1. Аустенитная сталь, имеющая высокую прочность и хорошую формуемость для холодной прокатки, содержащая, мас.%: С 0,05-0,78 Mn 11,0-14,9 Al 1,0-5,0 Ni 0-2,5, остатком является железо и неизбежные примеси, в которой микроструктура содержит, по меньшей мере, 80 об.% аустенита, и в которой (Ni+Mn) составляет от 11,0 до 15,9%. 2. Сталь по п.1, в которой микроструктура содержит, по меньшей мере, 85%, предпочтительно, по меньшей мере, 90%, более предпочтительно, по меньшей мере, 95 об.% аустенита. 3. Сталь по п.1 или 2, в которой содержание углерода составляет от 0,30 до 0,75%. 4. Сталь по п.1 или 2, в которой содержание никеля составляет не более 0,05%. 5. Сталь по п.1 или 2, в которой содержание алюминия составляет не более 4,0%. 6. Сталь по п.1 или 2, в которой содержание марганца составляет, по меньшей мере, 11,5%, предпочтительно, по меньшей мере, 12,0%. 7. Сталь по п.1 или 2, в которой содержание марганца составляет не более 14,7%. 8. Сталь по п.1 или 2, полученная в форме горячекатаной ...

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, ...

ОТПУЩЕННАЯ ЛИСТОВАЯ СТАЛЬ С ПОКРЫТИЕМ, ХАРАКТЕРИЗУЮЩАЯСЯ ПРЕВОСХОДНОЙ ДЕФОРМИРУЕМОСТЬЮ, И СПОСОБ ЕЕ ИЗГОТОВЛЕНИЯ

ЛИСТ ИЗ НЕТЕКСТУРИРОВАННОЙ ЭЛЕКТРОТЕХНИЧЕСКОЙ СТАЛИ С ВЫСОКОЙ ПЛОТНОСТЬЮ МАГНИТНОГО ПОТОКА И ДВИГАТЕЛЬ

СПОСОБ ПОЛУЧЕНИЯ МАГНИТОСТРИКЦИОННОЙ ЛЕНТЫ

Способ получения магнитострикционной ленты путем переработки сплава на основе системы железа - алюминия, включающий отжиг полученной ленты в вакууме и последующее охлаждение ленты, отличающийся тем, что выплавляют сплав, содержащий 7-14% алюминия и дополнительно включающий 0,04-0,1% углерода, разливку проводят при температуре выпуска расплава 1755-1800°С при начальном удельном давлении 0,35-0,4 т/см, со скоростной закалкой 106-107°С/с, затем направляют ленту на электропластическую прокатку с использованием электрического тока до 50000 А/мм2, высокотемпературный отжиг ведут при температуре 1150-1200°С в течение 1-2 ч, при скорости нагрева 20°С/мин, с последующим охлаждением по 120-150°С/мин до 800°С, затем - по 50°С/ч до 400°С.

СТОЙКАЯ К ОКИСЛЕНИЮ И КОРРОЗИИ АУСТЕНИТНАЯ НЕРЖАВЕЮЩАЯ СТАЛЬ, СОДЕРЖАЩАЯ МОЛИБДЕН

... 1. Аустенитная нержавеющая сталь, состоящая по существу из 19-23 мас.% хрома, 19-23 мас.% никеля, 1-6 мас.% молибдена, 0-0,1 мас.% углерода, 0-1,5 мас.% марганца, 0-0,05 мас.% фосфора, 0-0,02 мас.% серы, 0-1,0 мас.% кремния, 0,15-0,6 мас.% титана, 0,15-0,6 мас.% алюминия, 0-0,75 мас.% меди, железа и неизбежных примесей. 2. Изделие производства, включающее в себя аустенитную нержавеющую сталь, состоящую по существу из 19-23 мас.% хрома, 19-23 мас.% никеля, 1-6 мас.% молибдена, 0-0,1 мас.% углерода, 0-1,5 мас.% марганца, 0-0,05 мас.% фосфора, 0-0,02 мас.% серы, 0-1,0 мас.% кремния, 0,15-0,6 мас.% титана, 0,15-0,6 мас.% алюминия, 0-0,75 мас.% меди, железа и неизбежных примесей. 3. Изделие производства по п.2, которое выбрано из группы, включающей в себя автомобиль, элемент автомобильной выхлопной системы, гибкий соединитель, оболочку нагревательного элемента и прокладку. 4. Способ изготовления изделия производства, заключающийся в том, что обеспечивают аустенитную нержавеющую сталь, состоящую ...

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 ...

МОДИФИЦИРОВАННЫЕ СОСТАВЫ МЕТАЛЛА И ОТНОСЯЩИЕСЯ К НИМ СПОСОБЫ

Изобретение относится к металлургии, в частности, к композиции на основе железа и способу получения из нее металлического изделия в виде подложки с диффузионным покрытием. Может использоваться в автомобилестроении, авиации, производстве бытовых приборов, электротехнического и электронного оборудования и различных конструкций. Композиция на основе железа содержит по меньшей мере два элемента, выбранных из: 0,001-0,6 мас. % алюминия (Al), 0,001-0,3 мас. % титана (Ti), 0,5-3 мас. % марганца (Mn), 0,2 мас. % или менее ниобия (Nb), 0,01 мас. % или менее углерода (C), 0,001-0,02 мас. % азота (N), 0,02 мас. % фосфора (P) и 0,01 мас. % или менее серы (S). При диффузном легировании различие размеров зерен, например в сторону увеличения, меньше, чем у соответствующих зерен эталонной композиции, например, нержавеющих сталей 439 (439 SS), 304L (304L SS), DDS. Также раскрыты способ подготовки подложки, содержащей указанную композицию, путем термомеханической обработки и способ получения металлического ...

ТЕРМИЧЕСКИ ОБРАБОТАННЫЙ ХОЛОДНОКАТАНЫЙ СТАЛЬНОЙ ЛИСТ И СПОСОБ ЕГО ИЗГОТОВЛЕНИЯ

Изобретение относится к области металлургии, а именно к получению термически обработанного и холоднокатаного стального листа, используемого в качестве материала для изготовления конструкционных деталей или деталей безопасности транспортного средства. Лист имеет состав, включающий следующие элементы в мас.%: 0,09≤углерод≤0,15, 1,8≤марганец≤2,5, 0,2≤кремний≤0,7, 0,01≤алюминий≤0,1, 0≤фосфор≤0,09, 0≤сера≤0,09, 0≤азот≤0,09, при необходимости по меньшей мере один элемент, выбранный из: 0≤ниобий≤0,1, 0≤титан≤0,1, 0≤хром≤1, 0≤молибден≤1, 0≤ванадий≤0,1, 0≤кальций≤0,005, 0≤бор≤0,01, 0≤церий≤0,1, 0≤магний≤0,05 и 0≤цирконий≤0,05, остальное - железо и неизбежные примеси. Микроструктура листа включает в долях площади 65-85% отпущенного мартенсита, 0-5% остаточного аустенита и общее содержание феррита и бейнита 15-35%. Лист имеет предел прочности при растяжении 950 МПа или более, общее удлинение 8% или более и коэффициент раздачи отверстия по меньшей мере 55%. Стальной лист обладает требуемым уровнем ...

Жаростойкая сталь

Сталь

Сталь

Сталь для изготовления катализатора синтеза аммиака

Сталь

СТАЛЬ, содержащая углерод, кремний, марганец, алюминий ижелезо , отл. ичающаяся тем, что, с целью улучшения свариваемости и качества поверхности слитка, она дополнительно содеряит барий при следунмцем соотношении компонентов, мае. %: Углерод 0,11-0,15 0,15-0,30 Кремний 0,45-0,65 Марганец Алюминий 0,005-0,015 0,0003-0,0010 Барий Остальное Железо ...

Сталь

СТАЛЬ, содержащая углерод, марганец, алх миний, кремний и ..желе- , зо, отличающаяся тем,что с целью повышения механических свойств после длительной выдержки при температуре до 6 О , она содержит коотоненты при следукадем соотношении , мае.%: 0,3-0,5 Углерод 25 -27 Марганец 4,0-4,5 Алюминий 2,0-2,5 Кремний Остёшьное Железо ...

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CORROSION-RESISTANT CONSTRUCTION ALLOY FOR DETAILS OF THERMAL MACHINE

Электротехническая сталь

Stahlplatte mit hervorragenden Sprödbrucheigenschaften und Tieftemperaturbeständigkeit und Verfahren zu deren Herstellung

Behälter mit leicht zu öffnendem Deckel durch Aufreissen entlang einer Linie geringer Festigkeit und Stahlblech zu seiner Herstellung

Stahlblech mit Dualphasen-Gefüge und guten Einbrennhärtbarkeit-Eigenschaften

Eisenkern fuer elektrische Drosseln, insbesondere fuer Stoerschutzdrosseln, und Verfahren zu seiner Herstellung

Herstellungsverfahren für unidirektionale Siliziumstahlbleche mit hoher magnetischer Flussdichte

Magnetmaterial, Verfahren zur Herstellung und Magnetkopf.

Niederlegierter Baustahl mit aktiven Teilchen

Verwendung eines geformten Erzeugnisses aus feuerfestem keramischem Material

Die Erfindung betrifft ein geformtes Erzeugnis aus feuerfestem keramischem Material.

Höherfester Multiphasenstahl mit verbesserten Eigenschaften

Verfahren zum Herstellen eines kaltgewalzten Multiphasenstahls mit einem eingestellten Bruchverhalten der Schweißpunkte im punktgeschweißten Verbindungsbereich, dadurch gekennzeichnet, dass zum Erzielen von ausschließlich Ausknöpfbrüchen das Verhältnis des Phosphors zum Kohlenstoff so eingestellt wird, dass sich das Verhältnis unterhalb eines Geradenbereichs befindet, der durch die Formel y = –k·x + d gekennzeichnet ist, wobei in der Formel y der Gehalt des Phosphors in Gew.-% bezogen auf die gesamte Stahlzusammensetzung, k die Steigung der Geraden, x der Anteil des Kohlenstoffes in Gew.-% bezogen auf die gesamte Stahlzusammensetzung und d der maximal zulässige Phosphorgehalt ist, wobei k = 0,051, d = 0,0211 ist und wobei der Kohlenstoffgehalt 0,35 Gew.-%, vorzugsweise 0,3 Gew.-% nicht übersteigt.

Siliziumstahlblech und Herstellungsverfahren

Hochfestes, kaltgewalztes Stahlblech und Verfahren zu dessen Herstellung

Systeme für die landgestützte Verteilung mittels Fahrzeugen von Flüssigerdgas

STAHLLEGIERUNGEN UND ZYLINDERLAUFBUCHSEN AUS SELBIGEN

Stahllegierungen und Stahllegierungs-Zylinderlaufbuchsen werden bereitgestellt. Stahllegierungen können Eisen, etwa 0,8 bis etwa 2,1 % Mangan, ungefähr 0,10 bis ungefähr 0,40 % Silizium, ungefähr 0,05 bis 0,30 % Schwefel, ca. 0,06 bis etwa 0,16 % Phosphor, um 0,09 % bis etwa 0,21 % Titan, um 0,09 % bis etwa 0,21 % Aluminium umfassen und entweder niedrig gekohlt sein und etwa 0,0005 % bis etwa 0,0055 % Bor enthalten oder mittel gekohlt sein. Die Stahllegierungs-Zylinderlaufbuchsen können fähig sein, ein spiegelblankes Finish zu erzielen. Die Stahllegierung Zylinderlaufbuchsen können eine ultradünne Wandstärke von weniger als etwa 1,5 mm oder etwa 1,0 mm bis etwa 0,5 mm umfassen. Die Stahllegierungs-Zylinderlaufbuchse können ein Elastizitätsmodul von mindestens 200 GPa umfassen. Die Stahllegierungs-Zylinderlaufbuchse können ein Verhältnis von Elastizitätsmodul zu Dichte von mindestens etwa 25,64 GPa/(g/cm)3) umfassen.

Oxidations- und korrosionsbeständige Legierung auf der Basis von dotiertem Eisenaluminid und Verwendung dieser Legierung

Ferritisch rostfreier Stahl mit guter Verformbarkeit bei Raumtemperatur und mit guten mechanischen Eigenschaften bei höheren Temperaturen, und Verfahren zur Herstellung derselben

Verfahren zur Herstellung von konventionell warmgewalzten, profilierten Warmbanderzeugnissen

Die Erfindung betrifft ein Verfahren zum Herstellen von konventionell warmgewalzten und profilierten bzw. umgeformten Warmbanderzeugnissen, wobei einen Stahllegierung erschmolzen wird, wobei oberhalb der Rekristallisierungstemperatur der Legierung gewalzt wird, wobei die erschmolzene Stahllegierung in Brammen gegossen wird und die Brammen nach einer Aufheizung oberhalb Acbis zu einem gewünschten Umformgrad einer gewünschten Banddicke warmgewalzt werden, wobei das Band nach dem Walzen abgekühlt wird und zum Zwecke des Härtens bzw. Härtens und Anlassens kurzzeitig aufgeheizt und wieder abgekühlt wird, dadurch gekennzeichnet, dass das Aufheizen mit einer Temperatursteigerung von mehr als 100 K/s stattfindet und bei einer gewünschte Zieltemperatur von 0,5 bis 60 s gehalten wird und dann eine Abkühlung erfolgt.

HOCHZUGFESTES WARMGEWALZTES STAHLBLECH MIT HERVORRAGENDER MASSHALTIGKEIT UND HERVORRAGENDEN DAUERFESTIGKEITSEIGENSCHAFTEN NACH DEM FORMEN

MEHRPHASEN-STAHLBLECH MIT VERBESSERTER TIEFZIEHFÄHIGKEIT UND VERFAHREN ZU SEINER HERSTELLUNG

Glasartige Eisenlegierungen, mit einer grossen supergekühlter Temperaturspanne

Verfahren zur Herstellung von Stahlstreifen für Verpackungszwecke

Leichtbau-Kurbeltrieb und Herstellungsverfahren desselben

Leichtbau-Kurbeltrieb mit Komponenten aus ultrahochkohlenstoffhaltigem Leichtbaustahl (UHC-Leichtbaustahl), umfassend eine Kurbelwelle, ein Pleuel mit einem großen und einem kleinen Pleuelauge und einen Kolbenbolzen, wobei die Kurbelwelle in dem großen Pleuelauge und der Kolbenbolzen in dem kleinen Pleuelauge gelagert sind, wobei alle der Komponenten Kurbelwelle, Pleuel und Kolbenbolzen aus dem UHC-Leichtbaustahl bestehen und wobei der Kolbenbolzen eine Hartstoff-Beschichtung aufweist. dadurch gekennzeichnet, dass das Kurbelwellenlager in dem großen Pleuelauge aus zumindest zwei thermischen Spritzschichten gebildet wird, die aus unterschiedlichen Lager-Metalllegierungen bestehen und dass eine die Oberfläche des großen Pleuelauges bildende Spritzschicht durch eine Aluminium-Wismut-Legierung und die unter der Aluminium-Wismut-Legierungs-Spritzschicht liegende Schicht aus einer Lager-Metalllegierung aus Bronze, Messing, einer Aluminiumbronze oder einer Aluminium-Wismut-Legierung gebildet ist ...

Friction assembly for transmission of motion used, e.g., in motor vehicle gear boxes includes an element comprising a base body and a chromium-iron alloy friction coating

A friction assembly comprises a friction element and an opposing element. At least the friction element is formed of a base body (2) and a 10-200 micron thick friction coating (3) comprising a chromium-iron alloy on the base body (2). Preferred Details: The chromium-iron alloy contains 10-60% Cr, 0.3-0.5 C, and Fe the remainder. The alloy can also contain 3-25% Mo, 0.4-3.5% B, 3-18% Al, 4-12% Si, 0.5-6% V and 0.5-6% Nb. The friction element is subjected to nitriding or carbonitriding treatment. The friction body has surface roughness (Ra) above 0.5 microns before being coated and a roughness depth (Rz) of 20-100 microns after being coated. The opposing element is made from a steel alloy (such as 16MnCr5, 10OCr6, C45, 80Cr2 or C15), cast iron, a copper alloy or a sintered material (such as a sintered alloy of iron or bronze). Independent claims are given for use of the friction assembly in: (a) a gearbox synchronizing unit which comprises a synchronization bush and a coupling ring connected ...

Cold rolled steel sheet with relationship between inclusion separation distance and yield strength

Cold-rolled steel sheets, the first comprising ferrite and a martensite-containing second phase, has a composition (by weight): 0.05-0.3 % carbon, 1.5-3.5 % manganese, 0-3.0 % silicon, 0-0.1 phosphorous, 0-0.5 % sulphur, 0-0.15 % aluminium, 0-1 % chromium, 0-0.5 % molybdenum, 0-0.2 % titanium, 0-0.2 % vanadium, 0-0.3 % niobium, 0-0.5 % copper, 0-0.5 % nickel, 0-0.010 % calcium, 0-0.010 % magnesium, 0-005 % rare earth elements, with the balance being iron and impurities. The second, comprising a martensite single phase structure, has a composition (by weight): 0.12-0.3 % carbon, 1.5-3.0 % manganese, 0-0.5 % silicon, 0-0.02 phosphorous, 0-0.01 % sulphur, 0-0.15 % aluminium, 0-0.01 % nitrogen, 0-2.0 % chromium, 0-0.01 % boron, 0-0.5 % copper, 0-0.5 % nickel, 0-0.2 % titanium, 0-0.1 % vanadium, 0-0.1 % niobium, with the balance being iron and impurities. For each steel the distribution of inclusions is controlled, for example by RH degassing the melt and having a rolling reduction performed ...

Improvements in or relating to magnetic alloys

Magnetic iron alloys for use in the construction of electrical apparatus contain 0,1-12 per cent of aluminium and 0,1-6 per cent of arsenic. The alloys may be made by adding arsenic or ferro-arsenic to molten iron or by passing a stream of arsenic hydride or arsenic vapour into molten iron, the aluminium being afterwards added as such or as ferro-aluminium; or the arsenic and aluminium may be added in one operation if the molten iron has been first carefully deoxidized. Rolled sheets of the alloy may be annealed by heating in air, a neutral atmosphere, or hydrogen, for 1-48 hours at 900-1400 DEG C. In making laminations, the sheets may be annealed for several days at 900-1400 DEG C., cooled in the furnace, punched, and reannealed for a similar time at 700-800 DEG C.

Steel alloy and tube manufactured therefrom

... 1,146,785. Alloy steel. NIPPON KOKAN K.K. May 18, 1967 [Sept.10, 1966], No.23205/67. Heading C7A. A high tensile strength steel, for making tubes, tubes or die blocks, comprises;- C 0À1 - 0À23% Cr 0À1 - 0À5% Mn 1 - 1À5% Al 0À01 - 0À08% Cu less than 0À3% P less than 0À04% S less than 0À04 and Si 0À2 - 0À5% the balance apart from impurities, being iron.

BEARING RACE MEMBER

CREEP-RESISTING STEEL

... 1381881 Working at specified temperatures OVAKO OY 12 Nov 1971 [12 Nov 1970] 52710/71 Heading B3V [Also in Division C7] Low or high alloy steels have a structure of sub-grain sized cells stabilized by precipitation on the cell boundary networks of phases arising from the presence of all of the following elements in amounts up to the limits stated: Ti up to 0À15% by weight Zr up to 0À10% " " C up to 0À10% " " N up to 0À02% " " B up to 0À006% " " The cell structure may be developed by decomposition of austenite or by cold working and tempering, while the precipitate may be formed during production of the cell structure, by a subsequent heat treatment or during creep. As exemplified, a steel containing 0À07% C, 0À56% Si, 0À5% Mn, 0À05% Cr, 0À12% Ni, 0À03% Mo, 0À23% Cu, 0À15% Sn, 0À14% Ti, 0À0049% B, 0À068% Zr, 0À0125% N was forged at 1000‹ C., heated at 1200‹ C. for 2 hours and water quenched; after cold rolling by 0-40% the cell structure was stabilized by precipitation at 600‹ C. for 2 hours ...

Pipeline distribution network systems for transportation of liquefied natural gas

Pipeline distribution network systems are provided for transporting pressurized liquefied natural gas at a pressure of about 1035 kPa (150 psia) to about 7590 kPa (1100 psia) and at a temperature of about -123 {C (-190 {F) to about -62 {C (-80 {F). Pipes and other components of the pipeline distribution network systems are constructed from an ultra-high strength, low alloy steel containing less than 9 wt.% nickel and having a tensile strength greater than 830 MPa (120 ksi) and a DBTT lower than about -73 {C (-100 {F) environ.

High-strength cold rolled steel sheet excelling in chemical treatability

A high-strength cold rolled steel sheet that even when doped with Mo in order to attain a strength increase, exhibits stable excellent chemical treatability. With respect to the surface properties of the cold rolled steel sheet, there is satisfied the characteristic that not only is the maximum depth of unevenness (Ry) 10 žm or more but also the average spacing of the unevenness (Sm) is 30 žm or less. Further, there is satisfied either the characteristic that the load length ratio of surface unevenness (tp40) is 20% or below, or the characteristic that the difference between mentioned load length ratios (tp60) and (tp40) is 60% or above; preferably, there are satisfied both the characteristics. Still further, the surface has no cracks of 3 žm or less width and 5 žm or more depth.

Dual-phase steel sheet excellent in stretch flange formability and production method thereof

High-strength hot-rolled steel sheet excellent in chemical treatability

Disclosed is a high-strength hot-rolled steel sheet excellent in chemical treatability, wherein the maximum height (Ry) of profile inegularities in the surface is not less than 10 žm and the mean spacing (Sm) of the profile irregularities in the surface is not more than 30 žm. This high-strength hot-rolled steel sheet satisfies either, preferably both, of the following: the profile bearing length ratio (tp40) of the surface is not more than 20%, and the difference between the profile bearing length ratio (tp60) and the profile bearing length ratio (tp40) of the surface is not less than 60%. This high-strength hot-rolled steel sheet stably exhibits excellent chemical treatability, even when it contains Mo which is added for enhancing the strength thereof.

High strength steel pipe for low-temperature usage having excellent buckling resistance and toughness of welded heat affected zone and method for producing the same

An APIX100-grade high strength steel pipe includes a base material containing, in mass percentage, C: more than 0.03% and 0.08% or less, Si: 0.01% to 0.5%, Mn: 1.5% to 3.0%, P: 0.015% or less, S: 0.005% or less, Al: 0.01% to 0.08%, Nb: 0.005% to 0.025%, Ti: 0.005% to 0.025%, N: 0.001% to 0.010%, O: 0.005% or less, and B: 0.0003% to 0.0020%, further contains one or more of Cu, Ni, Cr, Mo, and V, satisfies 0.19≦P cm ≦0.25, the balance being Fe and unavoidable impurities, and has a TS of 760 to 930 MPa, a uniform elongation of 5% or more, and a YR of 85% or less; the seam weld metal has a specific composition.

Steel sheet for cans with excellent surface properties after drawing and ironing and method for producing the same

A component composition contains, by % by mass, 0.0016 to 0.01% of C, 0.05 to 0.60% of Mn, and 0.020 to 0.080% of Nb so that the C and Nb contents satisfy the expression, 0.4≦(Nb/C)×(12/93)≦2.5. In addition, the amount of Nb-based precipitates is 20 to 500 ppm by mass, the average grain diameter of the Nb-based precipitates is 10 to 100 nm, and the average crystal grain diameter of ferrite is 6 to 10 μm. Nb is added to ultra-low-carbon steel used as a base, and the amount and grain diameter of the Nb-based precipitates are controlled to optimize the pinning effect. Grain refinement of ferrite is achieved by specifying the Mn amount, thereby achieving softening and excellent resistance to surface roughness of steel.

Process for manufacturing a cold rolled trip steel product

The present invention is related to a process comprising a cold rolling step, for the production of uncoated, electro-galvanised or hot dip galvanised TRIP steel products, hot rolling a slab of a specific composition, wherein the finishing rolling temperature is higher than the Ar3 temperature, to form a hot-rolled substrate, cooling said substrate to a coiling temperature (CT) between 500° C. and 680° C., coiling said substrate at said coiling temperature, pickling said substrate to remove the oxides, cold rolling said substrate to obtain a reduction of thickness, with a minimum reduction of 40%.

Ferritic stainless steel with excellent heat resistance

A ferritic stainless steel contains no expensive elements such as Mo and W, is free from the oxidation resistance loss caused by addition of Cu, and thereby has excellent levels of oxidation resistance (including water vapor oxidation resistance), thermal fatigue property, and high-temperature fatigue property. The ferritic stainless steel contains, in mass %, C at 0.015% or less, Si at 0.4 to 1.0%, Mn at 1.0% or less, P at 0.040% or less, S at 0.010% or less, Cr at 16 to 23%, Al at 0.2 to 1.0%, N at 0.015% or less, Cu at 1.0 to 2.5%, Nb at 0.3 to 0.65%, Ti at 0.5% or less, Mo at 0.1% or less, and W at 0.1% or less, the Si and the Al satisfying a relation Si (%)≧Al (%).

Weld metal and welded structure having weld joints using the same

To provide weld metal that has a high strength and toughness in the as-welded condition or in the annealed condition. The weld metal of the present invention contains by weight %, C: 0.04-0.15%, Si: 0.50% or less, Mn: 1.0-1.9%, Ni: 1.0-4.0%, Cr: 0.10-1.0%, Mo: 0.20 to 1.2%, Ti: 0.010-0.060%, Al: 0.030% or less, O: 0.15-0.060%, N: 0.010% or less, Fe and inevitable impurities as the remaining contents. The weld metal is further characterized by the fact that the ratio of Ti content (%) to Si content (%) i.e.,[compound type Ti]/[compound type Si] is more than 1.5, and the number A defined by the following formula is 0.50 or more, wherein A=[Ti]/([O]−1.1×[Al]+0.05×[Si]).

High-strength steel sheet, hot-dipped steel sheet, and alloy hot-dipped steel sheet that have excellent fatigue, elongation, and collision characteristics, and manufacturing method for said steel sheets

This high-strength steel sheet includes: in terms of percent by mass, 0.03 to 0.10% of C; 0.01 to 1.5% of Si; 1.0 to 2.5% of Mn; 0.1% or less of P; 0.02% or less of S; 0.01 to 1.2% of Al; 0.06 to 0.15% of Ti; and 0.01% or less of N; and contains as the balance, iron and inevitable impurities, wherein a tensile strength is in a range of 590 MPa or more, and a ratio between the tensile strength and a yield strength is in a range of 0.80 or more, a microstructure includes bainite at an area ratio of 40% or more and the balance being either one or both of ferrite and martensite, a density of Ti(C,N) precipitates having sizes of 10 nm or smaller is in a range of 10 10 precipitates/mm 3 or more, and a ratio (Hvs/Hvc) of a hardness (Hvs) at a depth of 10 μm from a surface to a hardness (Hvc) at a center of a sheet thickness is in a range of 0.85 or more.

Method of producing a multi-microchannel, flow-through element and device using same

A method of producing a multi-microchannel, flow-through element, including the steps of providing a body of material, and producing multiple microchannels within the body, wherein the microchannels extend through the body to produce a multi-microchannel, flow-through element. Such an element can be used as a micromixer, a sensor element, a filter, a fuel element or a chromatographic element.

Article for magnetic heat exchange and method of fabricating an article for magnetic heat exchange

An article for magnetic heat exchange comprising a magnetocalorically active phase with a NaZn 13 -type crystal structure is provided by hydrogenating a bulk precursor article. The bulk precursor article is heated from a temperature of less than 50° C. to at least 300° C. in an inert atmosphere and hydrogen gas only introduced when a temperature of at least 300° C. is reached. The bulk precursor article is maintained in a hydrogen containing atmosphere at a temperature in the range 300° C. to 700° C. for a selected duration of time, and then cooled to a temperature of less than 50° C.

High-strength steel sheet and the method for production therefor

A high-strength steel sheet comprises, by weight, not less than 0.25% and not more than 0.5% of C, not less than 4% and not more than 14% of Mn, not less than 6.5% and not more than 9.5% of Cr, and not less than 0.3% and not more than 3% of Si. The high-strength steel sheet satisfies the following formulas 1 and 2 and mainly consists of austenite, and the high-strength steel sheet has yield strength of not less than 1000 MPa and total elongation of not less than 20%. 12≦2.0Si+5.5Al+Cr+1.5Mo≦25   (1) 13 ≦30C+0.5Mn+0.3Cu+Ni+25N≦17   (2) (Each element symbol in the above formulas indicates the content (weight %) of the element)

Friction stir welding and processing of oxide dispersion strengthened (ods) alloys

A method of welding including forming a filler material of a first oxide dispersoid metal, the first oxide dispersoid material having first strengthening particles that compensate for decreases in weld strength of friction stir welded oxide dispersoid metals; positioning the filler material between a first metal structure and a second metal structure each being comprised of at least a second oxide dispersoid metal; and friction welding the filler material, the first metal structure and the second metal structure to provide a weld.

Alumina forming bimetallic tube and method of making and using

Provided is a bimetallic tube for transport of hydrocarbon feedstocks in a petrochemical process unit and/or refinery process unit, including: i) an outer tube layer being formed from a steam cracker alloy including at least 18.0 wt. % Cr and at least 10.0 wt. % Ni; ii) an inner tube layer being formed from an alumina forming bulk alloy including 5.0 to 10.0 wt. % of Al, 18.0 wt. % to 25.0 wt. % Cr, less than 0.5 wt. % Si, and at least 35.0 wt. % Fe with the balance being Ni, wherein the inner tube layer is formed plasma powder welding the alumina forming bulk alloy on the inner surface of the outer tube layer; and iii) an oxide layer formed on the surface of the inner tube layer, wherein the oxide layer is substantially comprised of alumina, chromia, silica, mullite, spinels, or mixtures thereof.

High strength steel sheet and method for manufacturing the same

A high-strength steel sheet includes a composition containing, in mass percent, 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, 0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05% or less of aluminum, 0.07% to 0.20% of titanium, and 0.20% to 0.80% of vanadium, the balance being iron and incidental impurities.

Hic-resistant thick steel plate and uoe steel pipe

A thick steel plate and a UOE steel pipe having a high strength of at least X60 grade and improved resistance to HIC have a chemical composition consisting essentially of, in mass percent, C: 0.02-0.07%, Si: 0.05-0.50%, Mn: 1.1-1.6%, P: at most 0.015%, S: at most 0.002%, Nb: 0.005-0.060%, Ti: 0.005-0.030%, Al: 0.005-0.06%, Ca: 0.0005-0.0060%, N: 0.0015-0.007%, at least one of Cu, Ni, Cr, and Mo in a total amount of greater than 0.1% and less than 1.5%, and a remainder of Fe and impurities, wherein the degrees of segregation of Nb and Ti are both at most 2.0, and the ratio of (the degree of Nb segregation)/(the degree of Mn segregation) and the ratio of (the degree of Ti segregation)/(the degree of Mn segregation) are both at least 1.0 and at most 1.5.

Thin cast strip product with microalloy additions, and method for making the same

A steel product having, by weight, less than 0.25% carbon, between 0.20 and 2.0% manganese, between 0.05 and 0.50% silicon, aluminum 0.008% or less by weight, and at least one element selected from the group consisting of titanium between about 0.01% and about 0.20%, niobium between about 0.01% and about 0.20%, molybdenum between about 0.05% and about 0.50%, and vanadium between about 0.01% and about 0.20%, and having a microstructure comprised of a majority bainite, and fine oxide particles of silicon and iron distributed through the steel microstructure of average precipitate size less than 50 nanometers. The yield strength of the steel product may be at least 55 ksi (380 MPa) or the tensile strength of at least 500 MPa, or both. The steel product may have total elongation of at least 6% or 10%, and thickness less than 3.0 mm.

Method for producing martensitic steel with mixed hardening

A method of producing a martensitic steel including a content of other metals such that it can be hardened by intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%. The heat shaping temperature of a last heat shaping pass of the steel is lower than the solubility temperature of aluminum nitrides in the steel, and a treatment temperature for each potential heat treatment after the last heat shaping pass is lower than the solid-state solubility temperature of the aluminum nitrides in the steel.

Metal plate to be heated by radiant heat transfer and method of manufacturing the same, and metal processed product having portion with different strength and method of manufacturing the same

On part of a surface of a metal plate that is to be heated by radiant heat transfer with a near-infrared ray, a region where reflectance for a radiant ray is made lower than that of the original surface of the metal plate is formed. As reflectance reducing treatment, painting or thermal spraying in a blackish color, plating in a blackish color, treatment for increasing roughness of the surface of the metal plate, blasting, etching, blackening, surface layer quality changing treatment of the metal plate, or the like can be adopted. The metal plate is turned into a heated metal plate partially having a different temperature by being heated by radiant heat transfer, and thereafter, the heated metal plate is subjected to thermal processing accompanied by cooling, for example, by hot stamping.

High-strength hot-rolled steel sheet and method for manufacturing the same

A steel sheet contains, on a mass percent basis, 0.03%-0.12% C, 0.5% or less Si, 0.8%-1.8% Mn, 0.030% or less P, 0.01% or less S, 0.005%-0.1% Al, 0.01% or less N, 0.035%-0.100% Ti, and the balance being Fe and incidental impurities and has microstructures with a fraction of polygonal ferrite of 80% or more, the polygonal ferrite having an average grain size of 5 to 10 μm. The amount of Ti present in a precipitate having a size of less than 20 nm is 70% or more of the value of Ti* calculated using expression (1): Ti*=[Ti]−48×[N]/14  (1) where [Ti] and [N] represent a Ti content (percent by mass) and a N content percent by mass), respectively, of the steel sheet.

Non-oriented electrical steel sheet

A non-oriented electrical steel sheet contains 2.8 mass % or more and 4.0 mass % or less of Si, 0.2 mass % or more and 3.0 mass % or less of Al, and 0.02 mass % or more and 0.2 mass % or less of P. The non-oriented electrical steel sheet contains further contains 0.5 mass % or more in total of at least one kinds selected from a group consisting of 4.0 mass % or less of Ni and 2.0 mass % or less of Mn. A C content is 0.05 mass % or less, a N content is 0.01 mass % or less, an average grain diameter is 15 μm or less, and a <111> axial density is 6 or larger.

High manganese containing steels for oil, gas and petrochemical applications

Provided are high manganese containing ferrous based components and their use in oil, gas and/or petrochemical applications. In one form, the components include 5 to 40 wt % manganese, 0.01 to 3.0 wt % carbon and the balance iron. The components may optionally include one or more alloying elements chosen from chromium, nickel, cobalt, molybdenum, niobium, copper, titanium, vanadium, nitrogen, boron and combinations thereof.

METHOD AND SYSTEM FOR PRODUCING SINTERED NdFeB MAGNET, AND SINTERED NdFeB MAGNET PRODUCED BY THE PRODUCTION METHOD

A method and system for producing a slim-shaped sintered NdFeB magnet having a high level of coercive force and high degree of orientation, as well as a sintered NdFeB magnet produced by the aforementioned method or system. A system for producing a slim-shaped sintered NdFeB magnet according to the present invention includes: a filling unit and filling alloy powder; an orienting unit; a sintering furnace; and a conveying unit. The orienting unit is provided with a heating and orienting coil for heating the alloy powder in the molds before and/or after the application of the magnetic field so as to decrease the coercive force of the individual particles of the alloy powder.

High-strength seamless steel tube, having excellent resistance to sulfide stress cracking, for oil wells and method for manufacturing the same

A seamless steel tube contains 0.15% to 0.50% C, 0.1% to 1.0% Si, 0.3% to 1.0% Mn, 0.015% or less P, 0.005% or less S, 0.01% to 0.1% Al, 0.01% or less N, 0.1% to 1.7% Cr, 0.4% to 1.1% Mo, 0.01% to 0.12% V, 0.01% to 0.08% Nb, and 0.0005% to 0.003% B or further contains 0.03% to 1.0% Cu on a mass basis and has a microstructure which has a composition containing 0.40% or more solute Mo and a tempered martensite phase that is a main phase and which contains prior-austenite grains with a grain size number of 8.5 or more and 0.06% by mass or more of a dispersed M 2 C-type precipitate with substantially a particulate shape.

Method for making a hot water tank of ferritic stainless steel with a tig welded structure

Disclosed is a ferritic stainless steel for hot-water tanks with welded structure, comprising, in terms of % by mass, at most 0.02% of C, from 0.01 to 0.30% of Si, at most 1% of Mn, at most 0.04% of P, at most 0.03% of S, from more than 21 to 26% of Cr, at most 2% of Mo, from 0.05 to 0.6% of Nb, from 0.05 to 0.4% of Ti, at most 0.025% of N, and from 0.02 to 0.3% of Al, and optionally containing at least one of at most 2%, preferably from 0.1 to 2% of Ni and at most 1%, preferably from 0.1 to 1% of Cu, with a balance of Fe and inevitable impurities.

Nitrogen containing, low nickel sintered stainless steel

A water atomized stainless steel powder which comprises by weight-%: 10.5-30.0 Cr 0.5-9.0 Ni 0.01-2.0 Mn 0.01-3.0 Sn 0.1-3.0 Si 0.01-0.4 N optionally max 7.0 Mo optionally max 7.0 Cu optionally max 3.0 Nb optionally max 6.0 V balance iron and max 0.5 of unavoidable impurities.

Molybdenum-Free, High-Strength, Low-Alloy X80 Steel Plates Formed by Temperature-Controlled Rolling Without Accelerated Cooling

Steel alloy, plate, and longitudinally welded pipe formed from a molybdenum-free, high-strength, low-alloy steel, said steel alloy consisting essentially of, in wt. %: C: 0.05-0.09; Mn: 1.70-1.95; Ti: 0.01-0.02; Al: 0.02-0.055; Nb: 0.075-0.1; P: ≦0.015; S: ≦0.003; V 0.01-0.03; Mo: ≦0.003; and the remainder Fe and inevitable impurities. The plate is produced by rolling from a slab without the use of accelerated cooling.

Hot-rolled steel car or wire rod

A hot-rolled steel bar or wire rod consisting of C: 0.1 to 0.3%, Si: 0.05 to 1.5%, Mn: 0.4 to 2.0%, S: 0.003 to 0.05%, Cr: 0.5 to 3.0%, Al: 0.02 to 0.05%, and N: 0.010 to 0.025%, the balance being Fe and impurities, and the impurities containing P: 0.025% or less, Ti: 0.003% or less, and O: 0.002% or less, wherein the structure thereof is composed of a ferrite-pearlite structure, ferrite-pearlite-bainite structure, or ferrite-bainite structure; the standard deviation of ferrite fractions at the time when randomly selected 15 viewing fields of a transverse cross section are observed and measured with the area per one viewing field being 62,500 μm 2 is 0.10 or less; and in a region from the surface to one-fifth of the radius and a region from the center to one-fifth of the radius in the transverse cross section, the amount of Al precipitating as AlN is 0.005% or less, and the density in terms of the number of AlN having a diameter of 100 nm or larger is 5/100 μm 2 or less. In the hot-rolled steel bar or wire rod, even if hot forging is performed in various temperature ranges, austenite grains can be stably prevented from being coarsened at the time of heating for carburization.

Drawn heat treated steel wire for high strength spring use and pre-drawn steel wire for high strength spring use

Drawn heat treated steel wire for high strength spring use is provided containing, by mass %, C: 0.67% to less than 0.9%, Si: 2.0 to 3.5%, Mn: 0.5 to 1.2%, Cr: 1.3 to 2.5%, N: 0.003 to 0.007%, and Al: 0.0005% to 0.003%, having Si and Cr satisfying the following formula: 0.3%≦Si−Cr≦1.2%, and having a balance of iron and unavoidable impurities, having as impurities, P: 0.025% or less and S: 0.025% or less, furthermore having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm, further having, as a metal structure, at least residual austenite in a volume rate of over 6% to 15%, having a prior austenite grain size number of #10 or more, and having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm.

Method for manufacturing grain oriented electrical steel sheets

In a method for manufacturing grain oriented electrical steel sheets from a slab, controlling the steel sheet temperature so as to satisfy T (t)<FDT−(FDT−700)×t/6 (wherein T (t): steel sheet temperature (° C.), FDT: finishing temperature (° C.) and t: time (sec) after the completion of finish rolling) throughout the entire length of a coil during cooling after the completion of finish rolling in hot rolling, and controlling the steel sheet temperature of a tip portion of the coil representing 10% of the length of the coil to be not less than 650° C. at a lapse of 3 seconds from the completion of hot rolling, thus manufacturing a grain oriented electrical steel sheet exhibiting excellent magnetic properties throughout the entire coil length.

Gas-carburized steel part excellent in surface fatigue strength, steel product for gas carburizing, and manufacturing method of gas-carburized steel part

The present invention provides a steel product for gas carburizing used for manufacturing a carburized steel part. In the above steel product for gas carburizing, a composition of a base metal contains, in mass %, C: 0.1 to 0.4%, Si: exceeding 1.2 to 4.0%, Mn: 0.2 to 3.0%, Cr: 0.5 to 5.0%, Al: 0.005 to 0.1%, S: 0.001 to 0.3%, N: 0.003 to 0.03%, and O: limited to 0.0050% or less, and P: limited to 0.025% or less, and when the contents of Si, Mn, and Cr (mass %) are set to [Si %], [Mn %], and [Cr %], Expression (1) below is satisfied, and an alloy shortage layer satisfying Expression (2) below exists in a range from its surface to 2 to 50 μm in depth. 32≧3.5[Si %]+[Mn %]+3[Cr %]>9  (1) 3.5[Si %]+[Mn %]+3[Cr %]≦9  (2)

Joining of parts via magnetic heating of metal aluminum powders

A method of joining at least two parts includes steps of dispersing a joining material comprising a multi-phase magnetic metal-aluminum powder at an interface between the at least two parts to be joined and applying an alternating magnetic field (AMF). The AMF has a magnetic field strength and frequency suitable for inducing magnetic hysteresis losses in the metal-aluminum powder and is applied for a period that raises temperature of the metal-aluminum powder to an exothermic transformation temperature. At the exothermic transformation temperature, the metal-aluminum powder melts and resolidifies as a metal aluminide solid having a non-magnetic configuration.

Seamless steel pipe for high-strength hollow spring

Disclosed is a seamless steel pipe for a high-strength hollow spring, which comprises 0.20 to 0.70 mass % of C, 0.5 to 3.0 mass % of Si, 0.1 to 3.0 mass % of Mn, 0.030 mass % or less (including 0%) of P, 0.030 mass % or less (including 0%) of S, 0.02 mass % or less (including 0%) of N, and the remainder made up by Fe and unavoidable impurities, and which is characterized in that carbide has an equivalent circle diameter of 1.00 μm or less. The seamless steel pipe enables the production of a hollow spring having high strength and excellent durability.

Manufacturing method of grain-oriented electrical steel sheet

A predetermined steel containing Te: 0.0005 mass % to 0.0050 mass % is heated to 1320° C. or lower to be subjected to hot rolling, and is subjected to annealing, cold rolling, decarburization annealing, and nitridation annealing, and thereby a decarburized nitrided steel sheet is obtained. Further, an annealing separating agent is applied on the surface of the decarburized nitrided steel sheet and finish annealing is performed, and thereby a glass coating film is formed. The N content of the decarburized nitrided steel sheet is set to 0.0150 mass % to 0.0250 mass % and the relationship of 2×[Te]+[N]≦0.0300 mass % is set to be established. Note that [Te] represents the Te content and [N] represents the N content.

High-strength hot-rolled steel sheet and method of manufacturing the same

On a cross section with a sheet width direction of a high-strength hot-rolled steel sheet set as a normal line, with regard to an inclusion having a major diameter of 3.0 μm or more, a maximum of a major diameter/minor diameter ratio expressed by (a major diameter of the inclusion)/(a minor diameter of the inclusion) is 8.0 or less, and a sum total of a rolling direction length per 1 mm 2 cross section of a predetermined inclusion group composed of plural inclusions each having a major diameter of 3.0 μm or more and a predetermined extended inclusion having a length in a rolling direction of 30 μm or more is 0.25 mm or less. The plural inclusions composing the predetermined inclusion group congregate in both the rolling direction and a direction perpendicular to the rolling direction 50 μm or less apart from each other. The predetermined extended inclusion is spaced over 50 μm apart from all the inclusions each having a major diameter of 3.0 μm or more in at least either the rolling direction or the direction perpendicular to the rolling direction.

Ferritic stainless steel sheet excellent in oxidation resistance and ferritic stainless steel sheet excellent in heat resistance and method of production of same

Ferritic stainless steel sheet which has a high oxidation resistance and scale spallation resistance even at a high temperature near 1000° C., characterized by containing C: 0.020% or less, N: 0.020% or less, Si: over 0.10 to 0.35%, Mn: 0.10 to 0.60%, Cr: 16.5 to 20.0%, Nb: 0.30 to 0.80%, Mo: over 2.50 to 3.50%, and Cu: 1.00 to 2.50%, having an amount of increase of oxidation after a continuous oxidation test in the air at 1000° C. for 200 hours of 4.0 mg/cm 2 or less, and having an amount of scale spallation of 1.0 mg/cm 2 or less.

Ferrite-based stainless steel for use in components of automobile exhaust system

This ferritic stainless steel for components of an automobile exhaust system includes, in terms of percent by mass: C: ≦0.015%; Si: 0.01% to 0.50%; Mn: 0.01% to 0.50%; P: ≦0.050%; S: ≦0.010%; N: ≦0.015%; Al: 0.010% to 0.100%; Cr: 16.5% to 22.5%; Ni: 0.5% to 2.0%; and Sn: 0.01% to 0.50%, and further includes either one or both of Ti: 0.03% to 0.30% and Nb: 0.03% to 0.30%, with a remainder being Fe and inevitable impurities.

High-strength steel sheet and method for producing same

A high-strength steel sheet includes, by mass %, C: 0.03% to 0.30%, Si: 0.08% to 2.1%, Mn: 0.5% to 4.0%, P: 0.05% or less, S: 0.0001% to 0.1%, N: 0.01% or less, acid-soluble Al: more than 0.004% and less than or equal to 2.0%, acid-soluble Ti: 0.0001% to 0.20%, at least one selected from Ce and La: 0.001% to 0.04% in total, and a balance of iron and inevitable impurities, in which [Ce], [La], [acid-soluble Al], and [S] satisfy 0.02≦([Ce]+[La])/[acid-soluble Al]<0.25, and 0.4≦([Ce]+[La])/[S]≦50 in a case in which the mass percentages of Ce, La, acid-soluble Al, and S are defined to be [Ce], [La], [acid-soluble Al], and [S], respectively, and a microstructure includes 1% to 50% of martensite in terms of an area ratio.

Electromagnetic machine and system including silicon steel sheets

A silicon steel sheet formed from a silicon steel alloy composition includes, in parts by weight, iron, carbon present in an amount of from about 0.002 to about 0.06, silicon present in an amount of from about 1.5 to about 4.0, aluminum present in an amount of from about 0.1 to 1.0, titanium present in an amount of less than or equal to about 0.03, vanadium present in an amount of less than or equal to about 0.005, and cobalt present in an amount of from about 0.001 to about 5.0 based on 100 parts by weight of the composition. Neither niobium nor zirconium is present in the composition. A silicon steel sheet system including the silicon steel sheet and a coating disposed thereon, and an electromagnetic machine having a magnetic core including a plurality of sheets stacked adjacent one another are also disclosed.

High strength stick electrode

A shielded metal arc welding electrode for depositing a high strength weld metal bead on a workpiece which satisfies the strength requirements under America Welding Society A5.5 standard's E11018M classification with no chromium added to the composition of the electrode.

Automobile chassis part excellent in low cycle fatigue characteristics and method of production of same

An automobile chassis part which is excellent in low cycle fatigue characteristics, characterized by being formed by steel which contains, by mass %, C: 0.02 to 0.10%, Si: 0.05 to 1.0%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Ti: 0.005 to 0.1%, Al: 0.005 to 0.1%, N: 0.0005 to 0.006%, and B: 0.0001 to 0.01 and has a balance of Fe and unavoidable impurities, in which 80% or more of the part structure comprises a bainite structure and in which a portion where a ratio R/t of the thickness “t” and external surface curvature radius R is 5 or less has an X-ray half width of an (211) plane of 5 (deg) or less.

ELECTRODE FOR ELECTRIC-DISCHARGE SURFACE TREATMENT AND ELECTRIC-DISCHARGE SURFACE TREATMENT COATING

In order to establish an electric-discharge surface treatment capable of forming a smooth high-hardness coating, in the electric-discharge surface treatment in which pulsed electric discharge is generated between the electrode and a base material in a machining fluid or in the air by using a green compact, which is formed by compressing powder of an electrode material, as an electrode, and by using energy of the electric discharge, a coating including the electrode material or a reaction product of the electrode material reacted by the electric discharge energy is formed on a surface of the base material, wherein, as the powder of the electrode material, a mixed powder formed by mixing 10 to 75 vol % of Si powder to powder of a hard material is used. 1. An electrode for electric-discharge surface treatment , which is used in an electric-discharge surface treatment in which pulsed electric discharge is generated between the electrode and a base material in a machining fluid or in the air by using a green compact , which is formed by compressing powder of an electrode material , as the electrode , and by using energy of the electric discharge , a coating including the electrode material or a reaction product of the electrode material reacted by the electric discharge energy is formed on a surface of the base material ,wherein, as the powder of the electrode material, a mixed powder formed by mixing 10 to 75 vol % of Si powder to powder of a hard material is used.2. The electrode for electric-discharge surface treatment according to claim 1 ,{'sub': 3', '2', '2', '3, 'wherein, as the powder of the hard material, TiC, a metal such as W or Mo, a ceramic such as WC, CrC, MoC, SiC or TaC, a nitride such as TiN or SiN, or an oxide such as AlOis used.'}3. An electrode for electric-discharge surface treatment claim 1 , which is used in an electric-discharge surface treatment in which pulsed electric discharge is generated between the electrode and a base material in a ...

Steel Product with Improved Weathering Characteristics in Saline Environment

The present invention is related to a steel product of the weathering steel type, i.e. a product exhibiting increased corrosion resistance after having been exposed to the outside environment for a given time. According to the invention, the steel product is defined by a composition consisting of (in wt %):—Carbon between 0.03 and 0.2,—Manganese between 0.5 and 2,—Copper between 0 and 0.5,—Ti between 0 and 0.1,—Cr between 0 and 0.5,—Nickel between 0 and 0.2,—Niobium between 0 and 0.1,—Nitrogen between 0 and 0.01,—Sulphur between 0 and 0.01, Phosphor between 0 and 0.01,—Aluminium higher than 0 and maximum 1.5,—Silicon between 0.25 and 1.5, the balance being Fe and accidental impurities, and wherein the sum of the Al and Si levels is higher than about 0.85 wt %. 14-. (canceled)6. The steel product according to claim 5 , comprising no Sn and no Sb.7. A steel product according to claim 5 , said product being a sheet or beam.8. A steel product according to claim 6 , said product being a sheet or beam.9. Use of a steel product according to as a product that exhibits an increase in corrosion resistance when exposed to a chlorine-rich environment.10. Use of a product according to claim 6 , in saline outdoor conditions. The present invention is related to steel types and products made thereof, which exhibit an increase in corrosion resistance when exposed to a chlorine-rich environment. These steels are known as weathering steels.Weathering steels have been studied and documented for some time. The corrosion resistance is caused by a layer of rust that forms on the steel surface when it is exposed to the outside environment. Traditional alloying elements which enhance this type of weathering resistance are Cu, P, Cr and Ni. However, traditional weathering steels haven proven to be ineffective in an environment containing Cl ions, i.e. marine or seaside environments. It was observed that the Cl ions destabilize some of the stable components that form the protective oxide ...

High strength steel sheet and method for manufacturing the same

A high strength steel sheet has tensile strength of at least 1470 MPa and (tensile strength×total elongation) of at least 29000 MPa·% with a composition including, by mass %, C: 0.30% to 0.73%, Si: 3.0% or less, Al: 3.0% or less, Si+Al: at least 0.7%, Cr: 0.2% to 8.0%, Mn: 10.0% or less, Cr+Mn: at least 1.0%, P: 0.1% or less, S: 0.07% or less, N: 0.010% or less, and remainder as Fe and incidental impurities; and processing the steel sheet such that microstructure satisfies area ratio of martensite with respect to the microstructure of 15% to 90%; content of retained austenite of 10% to 50%; at least 50% of the martensite is constituted of tempered martensite and area ratio of the tempered martensite with respect to the microstructure is at least 10%; and area ratio of polygonal ferrite with respect to the microstructure is 10% or less.

HIGH STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT STRETCH-FLANGE FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

A high strength hot-rolled steel sheet has a composition containing more than 0.035% to 0.055% C, 0.2% or less Si, 0.35% or less Mn, 0.03% or less P, 0.03% or less S, 0.1% or less Al, 0.01% or less N, 0.08% to 0.25% Ti, and 0.0005% to 0.0035% B on a mass basis, solute B being 0.0005% or more, the remainder being Fe and unavoidable impurities; a matrix containing a ferrite phase having an area fraction of more than 95%; a microstructure in which Ti carbides having an average grain size of less than 10 nm are finely precipitated in grains of the ferrite phase and the volume fraction of the Ti carbides is 0.0015 to 0.007; and a tensile strength of 780 MPa or more. 1. A high strength hot-rolled steel sheet with excellent stretch-flange formability , having a composition comprising more than 0.035% to 0.055% C , 0.2% or less Si , 0.35% or less Mn 0.03% or less P , 0.03% or less s , 0.1% or less Al , 0.01% or less N , 0.08% to 0.25% Ti , and 0.0005% to 0.0035% B on a mass basis , solute B being 0.0005% or more , the remainder being Fe and unavoidable impurities; a matrix containing a ferrite phase having an area fraction of more than 95%; a microstructure in which Ti carbides having an average grain size of less than 10 nm are finely precipitated in grains of the ferrite phase and volume fraction of the Ti carbides is 0.0015 to 0.007; and a tensile strength of 780 MPa or more.2. The high strength hot-rolled steel sheet according to claim 1 , further comprising a plating layer on a surface of a steel sheet.3. The high strength hot-rolled steel sheet according to claim 1 , further comprising claim 1 , in total claim 1 , 1.0% or less of one or more of REMs claim 1 , Zr claim 1 , Nb claim 1 , V claim 1 , As claim 1 , Cu claim 1 , Ni claim 1 , Sn claim 1 , Pb claim 1 , Ta claim 1 , W claim 1 , Mo claim 1 , Cr claim 1 , Sb claim 1 , Mg claim 1 , Ca claim 1 , Co claim 1 , Sc claim 1 , Zn claim 1 , and Cs on a mass basis in addition to the composition.4. A method of manufacturing ...

STEEL WIRE WITH HIGH STRENGTH FOR COLD FORGING TO IMPROVE SERVICE LIFE OF MOLD AND METHOD OF MANUFACTURING THE SAME

The present invention relates to a pre-heat treatment steel wire with high strength for a cold forging which is used as a material for an engine, chassy and parts (bolts and shafts) of a steering device. The method includes: cold drawing of a wire rod containing 0.15-0.40 wt % of C, less than 1.5 wt % of Si, 0.30-2.0 wt % of Mn, less than 0.03 wt % of P, less than 0.03 wt % of S and the remainder including Fe and unavoidable impurities; rapidly heating the cold drawn wire rod in a series of high frequency induction heating devices over Ac3 transformation point for 30-90 seconds and maintaining such a heated state; rapidly cooling the wire rod in the heated state by water or oil; executing a tempering process by heating the wire rod to 500° C.-A1 transformation point for 30-90 seconds including a holding time at such a temperature; cooling the heated wire rod by water to achieve a wire rod with a tensile strength of 1,100-1,400 MPa; and cold drawing the wire rod at an area reduction rate of 25-40% to yield a tensile strength of 1,200-1,600 MPa. Although the inventive steel wire has a tensile strength more than 1,200 MPa, it is possible to execute cold forging and bring about a remarkable improvement of the service life of a mold. 1. A high strength steel wire with an improved service life of a mold for cold forging , comprising 0.15-0.40 wt % of C , less than 1.5 wt % of Si , 0.30-2.0 wt % of Mn , less than 0.03 wt % of P , less than 0.03 wt % of S , and the remainder including Fe and unavoidable impurities ,wherein the steel wire is cold drawn, in turn executed by quenching and tempering, and then drawn at an area reduction rate of 25-40% to yield a tensile strength of 1,200-1,600 MPa.2. The steel wire as recited in claim 1 , further comprising at least one or more components among 0.05-2.0 wt % of Cr claim 1 , 0.05-1.5 wt % of Mo claim 1 , 0.01-0.10 wt % of Ti claim 1 , 0.0003-0.0050 wt % of B claim 1 , and 0.01-0.05 wt % of Al.3. A method of manufacturing a high ...

ULTRA HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT DUCTILITY AND DELAYED FRACTURE RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

An ultra.-high-strength cold-rolled steel sheet with excellent ductility and delayed fracture resistance includes 0.15% to 0.75 C. 1.0% to 3.0% Si, 1.5% to 2.5% Mn, 0.05% or less P, 0.02% or less 5, 0.01% to 0.05% Al, and less than 0.005% N on a mass ratio, the remainder being Fe and =avoidable impurities, the ultra-high-strength cold-rolled steel sheet having a metal microstructure including 40% to 85% of a tempered martensite phase and 15% to 60% of a ferrite phase on a volume fraction basis and a tensile strength of 1320 Mtn or more. 1. An ultra-high-strength cold-rolled steel sheet with excellent ductility and delayed fracture resistance , comprising 0.15% to 0.25% C , 1.0% to 3.0% Si , 1.5% to 2.5% Mn , 0.05% or less P , 0.02% or less S , 0.01% to 0.05% Al , and less than 0.005% N on a mass ratio , the remainder being Fe and unavoidable impurities , the ultra-high-strength cold-rolled steel sheet having a microstructure comprising 40% to 85% of a tempered martensite phase and 15% to 60% of a ferrite phase on a volume fraction basis and a tensile strength of 1320 MPa or more.2. The cold-rolled steel sheet according to claim 1 , further comprising one or more of 0.1% or less Nb claim 1 , 0.1% or less Ti claim 1 , and 5 ppm to 30 ppm B on a mass ratio.3. The cold-rolled steel sheet according to claim 1 , having a total elongation of 12% or more.4. A method for manufacturing an ulta-high-strengh cold-rolled steel sheet having excellent ductility and delayed fracture resistance claim 1 , comprising;{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'heating a steel slab having the chemical composition specified in to 1200° C. or higher;'}hot-rolling the steel slab at a finish rolling end temperature of 800° C. or higher;pickling the steel;cold-rolling the steel;{'sub': 1', '3, 'continuously annealing the steel such that the steel is held at a temperature ranging from the Actransformation temperature to Actransformation temperature thereof for 30 a to 1200 s, cooled ...

Martensitic antibacterial stainless steel and manufacturing method thereof

This invention relates to antimicrobial martensitic stainless steels with nano precipitation and their manufacturing method of melting, forging, heat treatment. As the nano ε-Cu phases are precipitated in the matrix dispersedly, the martensitic stainless steels have excellent antimicrobial properties. The martensitic stainless steels may comprise from 0.35 to 1.20 weight percent C, from 12.00 to 26.90 weight percent Cr, from 0.29 to 4.60 weight percent Cu, 0.27 weight percent as less Ag, from 0.15 to 4.60 weight percent W, from 0.27 to 2.80 weight percent Ni, from 0.01 to 1.125 weight percent Nb, from 0.01 to 1.35 weight percent V, 1.8 percent or less Mn, from 0.15 to 4.90 weight percent Mo, 2.6 weight percent or less Si, 3.6 weight percent or less RE (rare earth) and the balance Fe and incidental impurities.

STEEL FOR MACHINE STRUCTURE EXHIBITING EXCELLENT MACHINABILITY

This steel for a machine structure contains, in mass %: C: 0.40% to less than 0.75%; Si: 0.01% to 3.0%; Mn: 0.1% to 1.8%; S: 0.001% to 0.1%; Al: more than 0.1% and not more than 1.0%; N: 0.001% to 0.02%; and P: limited to not more than 0.05%, with a balance including Fe and inevitable impurities, in which the steel satisfies 139.38 ≦214×[C]+30.6×[Si]+42.8×[Mn]−14.7×[Al]≦177 and 0.72≦[C]+1/7×[Si]+1/5×[Mn]<1.539. 1. A steel for a machine structure , the steel comprising , in mass %:C: 0.40% to less than 0.75%;Si: 0.01% to 3.0%;Mn: 0.1% to 1.8%;S: 0.001% to 0.1%;Al: more than 0.1% and not more than 1.0%;N: 0.001% to 0.02%; andP: limited to not more than 0.05%,with a balance including Fe and inevitable impurities, wherein [{'br': None, '139.38≦214×[C]+30.6×[Si]+42.8×[Mn]−14.7×[al]≦177\u2003\u2003(1)'}, {'br': None, '0.72≦[C]+1/7×[Si]+1/5×[Mn]<1.539\u2003\u2003(2)'}], 'an amount of C: [C], an amount of Si: [Si], an amount of Mn: [Mn], and an amount of Al: [Al] satisfy following Expression (1) and Expression (2).'}2. The steel for a machine structure according to claim 1 , wherein the steel further satisfies following Expression (3).{'br': None, '113−135×[C]−27×[Mn]≦13\u2003\u2003(3)'}3. The steel for a machine structure according to claim 1 , wherein the steel further satisfies following Expression (4).{'br': None, '55≦33+31×[C]+4.5×[Si]+1.5×[Mn]<72.45\u2003\u2003(4)'}4. The steel for a machine structure according to claim 2 , wherein the steel further satisfies following Expression (4).{'br': None, '55≦33+31×[C]+4.5×[Si]+1.5×[Mn]<72.45\u2003\u2003(4)'}5. The steel for a machine structure according to claim 1 , wherein {'br': None, '1.5<[Si]+1.8×[Mn]<6.24\u2003\u2003(5)'}, 'the steel further satisfies following Expression (5).'}6. The steel for a machine structure according to claim 1 , whereinthe steel further comprises B: 0.0001% to 0.015% in mass %.7. The steel for a machine structure according to claim 1 , whereinthe steel further comprises, in mass %, one or more ...

Grain oriented electrical steel sheet and method for manufacturing the same

A grain oriented electrical steel sheet is subjected to magnetic domain refinement by laser irradiation and has magnetic flux density B 8 of at least 1.91 T, wherein the nitrogen content in the forsterite coating is 3.0 mass % or less. The grain oriented electrical steel sheet satisfies recent demand for iron loss reduction.

METHOD OF PRODUCING AN AUSTENITIC STEEL

A method of producing an austenitic steel strip or sheet excellent in resistance to delayed cracking and a steel produced thereby. 2. Process according to claim 1 , wherein the aluminium content of the work piece is at least 1.25 and/or at most 3.5%.3. Process according to claim 1 , wherein during the cooling at a cooling rate Vafter the continuous annealing the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.4. Process according to claim 1 , wherein the strip or sheet is pickled after continuous annealing and wherein the strip or sheet is provided with a metallic coating by pickling after annealing followed by heating to a temperature below the continuous annealing temperature before the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.5. Process according to claim 1 , wherein reduction of the cold-rolling is between 10 to 90%.6. Process according to claim 1 , wherein the annealed strip or sheet is temper rolled with a reduction of from 0.5 to 10% prior to or after the metallic coating has been provided to the strip or sheet.7. Process according to claim 1 , wherein the Vanadium content is between 0.06 and 0.22%.8. Process according to claim 1 , wherein the cooling rate Vis between 20 and 80° C./s.9. Process according to claim 1 , wherein the strip or sheet is pickled after continuous annealing and wherein the strip or sheet is provided with a metallic coating claim 1 , by pickling after continuous annealing followed by heating to a temperature between 400 and 600° C. before the strip or sheet is led through a hot dip bath for providing a metallic coating by hot dipping the strip or sheet into a molten bath of the metal making up the metallic coating.10. Process according to claim 9 , wherein the Fe in the strip or ...

Spring and manufacture method thereof

A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% of Mn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section. The spring has a high hardness layer with greater hardness than a center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.

Martensitic Stainless Steel and Production Method Therefor

A martensitic stainless steel for use in tableware, knives, scissors and the like, containing in % by weight, 0.10 to 0.50% carbon and 11 to 16% chromium, and a production method therefore. A production method for mid-carbon martensitic stainless steel in a strip-casting device comprising a pair of rolls rotating in opposite directions, edge dams respectively provided to both sides of the rolls so as to form a molten steel pool, and a meniscus shield for supplying inert nitrogen gas to the upper surface of the molten steel pool, wherein a stainless-steel thin sheet is produced by supplying a molten stainless steel of the above composition to the molten steel pool via a nozzle from a tundish, and a hot-rolled annealed strip is produced to a rolling reduction of 5 to 40% using in-line rollers, and relates to martensitic stainless steel produced by the production method 1. A production method for a martensitic stainless steel , wherein , in a strip-casting device comprising a pair of rolls rotating in opposite directions , edge dams respectively provided to both sides of the rolls so as to form a molten steel pool , and a meniscus shield for supplying inert nitrogen gas to the upper surface of the molten steel pool , a stainless-steel thin sheet is produced by supplying a molten stainless steel containing , as percentages by weight , 1.10 to 0.50% carbon and 11 to 16% chromium , to the molten steel pool via a nozzle from a tundish , and a hot-rolled annealed strip is produced to a rolling reduction of 5 to 40% using in-line rollers.2. The production method of claim 1 , wherein the martensitic stainless steel contains claim 1 , as percentages by weight claim 1 , 0.1 to 1.0% silicon (Si) claim 1 , 0.1 to 1.0% manganese (Mn) claim 1 , over 0 to 0.1% nickel (Ni) claim 1 , over 0 to 0.04 sulfur (S) claim 1 , and over 0 to 0.05 phosphorus (P) claim 1 , and Fe and other unavoidable impurities as remnants.3. The production method of claim 1 , wherein a hot-rolled annealed ...

Manufacturing method of non-oriented electrical steel sheet

A steel having a predetermined composition is hot-rolled so as to form a steel strip, the steel strip is subjected to first cold-rolling, the steel strip is subjected to intermediate annealing, the steel strip is subjected to second cold-rolling, and the steel strip is subjected to finish annealing. A finish temperature in the hot-rolling is 900° C. or less, annealing is not performed between the hot-rolling and the first cold-rolling, and a rolling reduction in the second cold-rolling is not less than 40% nor more than 85%.

Structural stainless steel sheet having excellent corrosion resistance at weld and method for manufacturing same

A structural stainless steel sheet which can be manufactured at a low cost and with high efficiency, and possesses excellent welded-part corrosion resistance and a manufacturing method thereof are provided. The structural stainless steel sheet has a composition which contains by mass % 0.01 to 0.03% C, 0.01 to 0.03% N, 0.10 to 0.40% Si, 1.5 to 2.5% Mn, 0.04% or less P, 0.02% or less S, 0.05 to 0.15% Al, 10 to 13% Cr, 0.5 to 1.0% Ni, 4×(C+N) or more and 0.3% or less Ti, and Fe and unavoidable impurities as a balance, V, Ca and O in the unavoidable impurities being regulated to 0.05% or less V, 0.0030% or less Ca and 0.0080% or less O, wherein an F value expressed by Cr+2×Si+4×Ti−2×Ni−Mn−30×(C+N) satisfies a condition that F value≦11 and an FFV value expressed by Cr+3×Si+16×Ti+Mo+2×Al−2×Mn−4×(Ni+Cu)−40×(C+N)+20×V satisfies a condition that FFV value≦9.0.

Ferritic stainless steel

A ferritic stainless steel that generates only a small amount of black spots in weld zone, the steel containing, in mass %, 0.020% or less of C, 0.025% or less of N, 1.0% or less of Si, 1.0% or less of Mn, 0.035% or less of P, 0.01% or less of S, 16.0 to 25.0% of Cr, 0.12% or less of Al, 0.05 to 0.35% of Ti, and 0.0015% or less of Ca, and the balance consisting of Fe and unavoidable impurities, wherein the following formula 1 is satisfied. BI=3Al+Ti+0.5Si+200Ca≦0.8  (1) where Al, Ti, Si, and Ca in the formula 1 each denotes an amount of each element in mass % of the steel.

Grain oriented electrical steel sheet and method for manufacturing the same

A grain oriented electrical steel sheet may reduce iron loss of material with linear grooves formed thereon for magnetic domain refinement and offer excellent low iron loss properties when assembled as an actual transformer, where the steel sheet has sheet thickness of 0.30 mm or less, linear grooves are formed at intervals of 2-10 mm in the rolling direction, the depth of each of the linear grooves is 10 μm or more, the thickness of the forsterite film at bottom portions of the linear grooves is 0.3 μm or more, total tension applied to the steel sheet by the forsterite film and tension coating is 10.0 MPa or higher in rolling direction, and the proportion of eddy current loss in iron loss W 17/50 of the steel sheet is 65% or less when alternating magnetic field of 1.7 T and 50 Hz is applied to the steel sheet in the rolling direction.

Grain oriented electrical steel sheet and method for manufacturing the same

A grain oriented electrical steel sheet is subjected to magnetic domain refining treatment by electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer, in which a ratio (Wa/Wb) of a film thickness (Wa) of the forsierite film on a strain-introduced side of the steel sheet to a film thickness (Wb) of the forsierite film on a non-strain-introduced side of the steel sheet is 0.5 or higher, a magnetic domain discontinuous portion in a surface of the steel sheet on the strain-introduced side has an average width of 150 to 300 μm, and a magnetic domain discontinuous portion in a surface of the steel sheet on the non-strain-introduced side has an average width of 250 to 500 μm.

STEEL WIRE OF SPECIAL STEEL AND WIRE ROD OF SPECIAL STEEL

A predetermined composition is had, when a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite and bainite. Further, in a region to a depth of 1.0 mm from a surface, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction and a lamellar direction on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite. 1. A steel wire of special steel containing:in mass %;C: 0.35% to 0.85%;Si: 0.05% to 2.0%;Mn: 0.20% to 1.0%; andAl: 0.005% to 0.05%,a P content being 0.030% or less,a S content being 0.030% or less, anda balance being composed of Fe and inevitable impurities, whereinwhen a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite or bainite,in a region up to a depth of 1.0 mm from a surface of the steel wire, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction of the steel wire and a lamellar direction of the perlite on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite, anda tensile strength is 1200 MPa or more and less than 1500 MPa.2. The steel ...

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

Described is a high tensile strength hot rolled steel sheet having high strength and formability, and a manufacturing method. It has tensile strength≧980 MPa and excellent formability, and specifically identified ranges by mass % of C, Si, Mn, P, S, N, Al, Ti, V, Solute V, and Solute Ti; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter<10 nm, as well as volume ratio with respect to the entire microstructure≧0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure≧97%. C, Ti, V, S and N satisfy (1) Ti≧0.08+(N/14×48+S/32×48) and (2) 0.8≦(Ti/48+V/51)/(C/12)≦1.2, where “C”, “Ti”, “V”, “S” and “N” represent contents (mass %) of corresponding elements, respectively. 1. A high tensile strength hot rolled 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,', 'Al: 0.06% or less,', 'Ti: 0.08% to 0.14% (inclusive of 0.08% 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 consisting of Fe and incidental impurities;, 'a composition including by mass %,'}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 volume ratio with respect to the entire microstructure of at least 0.007; and [{'br': None, 'Ti≧0.08+(N/14×48+S/32×48)\u2003\u2003(1)'}, {'br': None, '0.8≦(Ti/48+V/51)/(C/12)≦1.2\u2003\u2003(2)'}], 'matrix as ferrite phase having area ratio with respect to the entire microstructure of at least 97%, wherein contents of C, Ti, V, S and N satisfy formula (1) and formula (2) ...

High-strength cold rolled sheet having excellent formability and crashworthiness and method for manufacturing the same

A high-strength cold rolled steel sheet has excellent formability and crashworthiness and includes, on a mass % basis, C: 0.05 to 0.3%, Si: 0.3 to 2.5%. Mn: 0.5 to 3.5%, P: 0.003 to 0.100%, 5: 0.02% or less, Al: 0.010 to 0.5%, the balance being iron and unavoidable impurities, the high-strength cold rolled steel sheet having a microstructure including 20% or more of ferrite on an area fraction basis, 10 to 60% of tempered martensite on an area fraction basis, 0 to 10% of martensite on an area fraction basis, and 3 to 15% of retained austenite on a volume fraction basis.

Complex metallographic structured high strength steel and method of manufacturing

A multi-phase steel sheet having microstructure having in combination ferrite, martensite of between 3% and 65% by volume, and at least one microstructure selected from the group consisting of, bainite and retained austenite, and having fine complex precipitates selected from the group of TiC, NbC, TiN, NbN, (Ti.Nb)C, (Ti.Nb)N, and (Ti.Nb)(C.N) particles having at least 50% smaller than 20 nm in size, and physical properties having tensile strength greater than about 780 megapascals and at least one of the properties of elongation greater than about 10%, yield ratio greater than about 70%, and hole expansion ratio greater than about 50%.

STEEL FOR CARBURIZING, CARBURIZED STEEL COMPONENT, AND METHOD OF PRODUCING THE SAME

A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and a TiC precipitation parameter. 1. A steel for a carburizing comprising as a chemical composition , by mass % ,C: 0.07% to 0.13%,Si: 0.0001% to 0.50%,Mn: 0.0001% to 0.80%,S: 0.0001% to 0.100%,Cr: more than 1.30% to 5.00%,B: 0.0005% to 0.0100%,Al: 0.0001% to 1.0%,Ti: 0.010% to 0.10%,N: limited to 0.0080% or less,P: limited to 0.050% or less,O: limited to 0.0030% or less, anda balance consisting of iron and unavoidable impurities,wherein amounts expressed in mass % of each element in the chemical composition satisfy simultaneouslya following Equation 1 as a hardness parameter,a following Equation 2 as a hardenability parameter, and [{'br': None, '0.10 Подробнее

STEEL FOR CARBURIZING, CARBURIZED STEEL COMPONENT, AND METHOD OF PRODUCING THE SAME

A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and an AlN precipitation parameter. 1. A steel for a carburizing comprising as a chemical composition , by mass % ,C: 0.07% to 0.13%,Si: 0.0001% to 0.50%,Mn: 0.0001% to 0.80%,S: 0.0001% to 0.100%,Cr: more than 1.30% to 5.00%,B: 0.0005% to 0.0100%,Al: 0.070% to 0.200%,N: 0.0030% to 0.0100%,Ti: limited to 0.020% or less,P: limited to 0.050% or less,O: limited to 0.0030% or less, anda balance consisting of iron and unavoidable impurities,wherein amounts expressed in mass % of each element in the chemical composition satisfy simultaneously,a following Equation 1 as a hardness parameter,a following Equation 2 as a hardenability parameter, and [{'br': None, '0.10 Подробнее

Method of producing non-oriented electrical steel sheet

Disclosed is a method for producing a non-oriented magnetic steel sheet, wherein a steel slab that consists of 0.01-0.1 mass % of C, 4 mass % or less of Si, 0.05-3 mass % of Mn, 3 mass % or less of Al, 0.005 mass % or less of S, 0.005 mass % or less of N and the balance made up of Fe and unavoidable impurities is subjected to hot rolling, cold rolling and final annealing. By carrying out the final annealing, while setting the average heating rate during the heating to 100° C./sec or more and setting the soaking temperature within the temperature range of 750-1100° C., a non-oriented magnetic steel sheet that has extremely increased magnetic flux density in the rolling direction of the steel sheet is advantageously produced.

HEAT-RESISTANT FERRITIC STAINLESS STEEL SHEET HAVING EXCELLENT OXIDATION RESISTANCE

A heat-resistant ferritic stainless steel sheet having excellent oxidation resistance while being low in cost and optimal for use in exhaust system components, wherein mass % falls within the following ranges: C: 0.015% or less, N: 0.020% or less, P: 0.04% or less, S: 0.001% or less, Si: 0.3-1.5% or less, Mn: 0.3-0.7% or less, Cr: 11.0-17.0%, Cu: 0.8-1.5%, Ni: 0.05-1.0%, V: 0.5% or less, Al: over 0.01 up to 0.1%, Ti: 10(C+N) to 0.3%. Also, the element content of the elements in the ferritic stainless steel sheet having excellent oxidation and thermal resistance has been mutually adjusted in a manner such that the value of γ defined in formula (1) is 35 or less. 1. A ferritic stainless steel sheet having excellent heat resistant and oxidation resistance comprising: by mass % ,C: 0.015% or less,N: 0.020% or less,P: 0.04% or less,S: 0.01% or less,Si: 0.3 to 1.5%,Mn: 0.3 to 0.7%,Cr: 11.0 to 17.0%,Cu: 0.8 to 1.5%,Ni: 0.05 to 1.0%,V: 0.5% or less,Al: 0.01 to 0.1%, andTi: 10(C+N) to 0.3%;the amounts of the elements being mutually adjusted such that the γ-value which is defined by the following formula (1), becomes 35 or less, and {'br': None, 'γ=23[% Ni]+9[% Cu]+7[% Mn]−11.5[% Cr]−11.5[% Si]−52[% Al]−49[[Ti %]−4([% C]+[% N])]−23 [% V]−12[% Mo]−47[% Nb]+189\u2003\u2003(1).'}, 'has a balance of Fe and unavoidable impurities2. The ferritic stainless steel sheet having excellent heat-resistance and oxidation resistance as set forth in claim 1 , wherein said stainless steel sheet further comprises claim 1 , by mass % claim 1 , at least one or more selected from the group consisting ofNb: 0.001 to 0.3%,Mo: 0.01 to 0.5%, andB: 0.0003 to 0.0050%.3. The ferritic stainless steel sheet having excellent heat-resistance and oxidation resistance as set forth in claim 1 , wherein said stainless steel sheet further comprises claim 1 , by mass % claim 1 , at least one or more selected from the group consisting ofZr: 1.0% or less,Sn: 1.0% or less, andCo: 0.5% or less.4. The ferritic ...

Method of producing cold-rolled steel sheet as well as cold-rolled steel sheet and members for automobile

In a method of producing a cold-rolled steel sheet being excellent in not only the phosphate treatability but also the corrosion resistance after coating under severe corrosion environment such as hot salt water immersion test or composite cycle corrosion test, a continuously annealed steel sheet after cold rolling preferably including 0.5-3.0 mass % of Si is pickled to remove a Si-containing oxide layer on a surface layer of the steel sheet and further repickled so that a surface covering ratio of an iron-based oxide on the surface of the steel sheet is not more than 40% and preferably a maximum thickness of the iron-based oxide is not more than 150 nm, as well as a cold-rolled steel sheet produced by this method and a member for automobile using the cold-rolled steel sheet.

HOT-ROLLED STEEL SHEET, COLD-ROLLED STEEL SHEET, GALVANIZED STEEL SHEET, AND METHODS OF MANUFACTURING THE SAME

A hot-rolled steel sheet has an average value of the X-ray random intensity ratio of a {100} <011> to {223} <110> orientation group at least in a sheet thickness central portion that is in a sheet thickness range of ⅝ to ⅜ from a steel sheet surface of 1.0 to 6.0, an X-ray random intensity ratio of a {332} <113> crystal orientation of 1.0 to 5.0, rC which is an r value in a direction perpendicular to a rolling direction of 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30° with respect to the rolling direction of 0.70 to 1.10. 1. A hot-rolled steel sheet comprising , by mass %:C: 0.0001% to 0.40%;Si: 0.001% to 2.5%;Mn: 0.001% to 4.0%;P: 0.001% to 0.15%;S: 0.0005% to 0.03%;Al: 0.001% to 2.0%;N: 0.0005% to 0.01%;O: 0.0005% to 0.01%;and further comprising one or two or more of:Ti: 0.001% to 0.20%;Nb: 0.001% to 0.20%;V: 0.001% to 1.0%;W: 0.001% to 1.0%;B: 0.0001% to 0.0050%;Mo: 0.001% to 1.0%;Cr: 0.001% to 2.0%;Cu: 0.001% to 2.0%;Ni: 0.001% to 2.0%;Co: 0.0001% to 1.0%;Sn: 0.0001% to 0.2%;Zr: 0.0001% to 0.2%;As: 0.0001% to 0.50%;Mg: 0.0001% to 0.010%;Ca: 0.0001% to 0.010%; andREM: 0.0001% to 0.1%;and balance composed of iron and inevitable impurities,wherein an average value of an X-ray random intensity ratio of a {100} <011> to {223}<110> orientation group at least in a sheet thickness central portion that is in a sheet thickness range of ⅝ to ⅜ from a steel sheet surface is 1.0 to 6.0, an X-ray random intensity ratio of a {332} <113> crystal orientation is 1.0 to 5.0; andrC which is an r value in a direction perpendicular to a rolling direction is 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30° with respect to the rolling direction is 0.70 to 1.10.2. The hot-rolled steel sheet according to claim 1 ,wherein rL which is an r value in the rolling direction is 0.70 to 1.10, and r60 which is an r value in a direction that forms an angle of 60° with respect to the rolling direction is 0.70 to 1.10.3. The ...

Alloy material for r-t-b-based rare earth permanent magnet, method for producing r-t-b-based rare earth permanent magnet, and motor

An alloy material for an R-T-B-based rare earth permanent magnet, including (i) an R-T-B-based alloy composed of R being two or more members selected from rare earth elements, T being a transition metal that essentially contains Fe, B and unavoidable impurities, and in which the Dy content is more than 10% by mass and less than 31% by mass, and (ii) a metal powder. Also disclosed is a method for producing an R-T-B-based rare earth permanent magnet and a motor provided with the R-T-B-based rare earth permanent magnet.

STEEL FOR INDUCTION HARDENING AND CRANKSHAFT MANUFACTURED USING THE SAME

There is provided a steel for induction hardening in which cracks are less liable to occur and high hardness and seizure resistance are attained even if a tempering process after induction hardening is omitted. The steel for induction hardening according to the present invention contains, by mass percent, C: 0.20 to 0.34%, Si: at most 0.20%, Mn: 0.75 to 2.0%, P: at most 0.03%, S: at most 0.20%, Cr: 0.05 to 1.2%, Ti: at least 0.002% and less than 0.030%, Al: 0.005 to 0.04%, and N: 0.0040 to 0.020%, the balance being Fe and impurities, and satisfies Formula (1): 2. A crankshaft manufactured by induction-hardening the steel for induction hardening according to .3. The crankshaft according to claim 2 , which is manufactured by being not tempered. The present invention relates a steel for induction hardening and a crankshaft manufactured using the same. More particularly, the present invention relates to a steel for induction hardening that is used for a crankshaft manufactured by induction hardening, and a crankshaft manufactured using the steel for induction hardening.Some crankshaft is manufactured by being subjected to induction hardening and tempering followed by grinding. Induction hardening induces residual stress in steel. The residual stress causes cracks such as quenching cracks and grinding cracks. Tempering reduces residual stress and restrains the occurrence of cracks.If a tempering process can be omitted, the manufacturing cost goes down. However, cracks attributable to the residual stress induced at the time of induction hardening are liable to occur. For this reason, there has been a demand for a steel for induction hardening in which cracks are less liable to occur even if a tempering process is omitted in the manufacturing process of a crankshaft.JP61-186419A, JP2000-26933A, JP2005-256134A, and JP2007-113063A disclose steels which are used for manufacturing a hot forged product and a crankshaft, and in which cracks attributable to induction hardening ...

HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT TOUGHNESS AND METHOD FOR MANUFACTURING THE SAME

The steel sheet includes C: 0.04 to 0.12%, Si: 0.5 to 1.2%, Mn: 1.0 to 1.8%, P: not more than 0.03%, S: not more than 0.0030%, Al: 0.005 to 0.20%, N: not more than 0.005% and Ti: 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes a microstructure containing a bainite phase at an area fraction exceeding 95% and having an average grain diameter of not more than 3 μm, has a difference ΔHv1 of not more than 50 between a Vickers hardness value at 50 μm from the surface and a Vickers hardness value at ¼ of a sheet thickness, has a difference ΔHv2 of not more than 40 between the Vickers hardness value at ¼ of the sheet thickness and a Vickers hardness value at ½ of the sheet thickness. 1. A high strength hot rolled steel sheet with excellent toughness , which comprises , in terms of mass % , C: 0.04 to 0.12% , Si: 0.5 to 1.2% , Mn: 1.0 to 1.8% , P: not more than 0.03% , S: not more than 0.0030% , Al: 0.005 to 0.20% , N: not more than 0.005% and Ti: 0.03 to 0.13% , the balance being Fe and inevitable impurities , contains a bainite phase at an area fraction exceeding 95% , the bainite phase having an average grain diameter of not more than 3 μm , has a difference ΔHv1 of not more than 50 between a Vickers hardness value at 50 μm from the surface and a Vickers hardness value at ¼ of a sheet thickness , has a difference ΔHv2 of not more than 40 between the Vickers hardness value at ¼ of the sheet thickness and a Vickers hardness value at ½ of the sheet thickness , the sheet thickness being not less than 4.0 mm and not more than 12 mm , and has a tensile strength of not less than 780 MPa.2. The high strength hot rolled steel sheet with excellent toughness according to claim 1 , wherein the steel sheet further comprises claim 1 , in terms of mass % claim 1 , Ni: 0.01 to 0.50%.3. The high strength hot rolled steel sheet with excellent toughness according to claim 1 , wherein the steel sheet further comprises claim 1 , in terms of mass % claim 1 , one claim 1 ...

HIGH STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT STRETCH FLANGEABILITY AND METHOD FOR MANUFACTURING THE SAME

A steel is subjected to a hot rolling step, a cold rolling step, and an annealing step having a maximum achieving temperature: 800° C. to 900° C., two-step heating, and two-step cooling. The two-step heating includes first-step heating to (maximum achieving temperature—(10° C. to 50° C.)) at an average temperature raising rate: 0.5° C. to 5.0° C./s and second-step heating in which the temperature raising time from that temperature range to the maximum achieving temperature is specified to be 30 to 150 s. Two-step cooling includes first-step cooling to cool from the maximum achieving temperature at a cooling rate of 10° C. to 40° C./s and second-step cooling to cool to a temperature range of 400° C. to 500° C. at a cooling rate of 0.2 to 0.8 times the first-step cooling rate for a cooling time of 0.2 to 0.8 times the total cooling time. 2. The high strength cold rolled steel sheet according to claim 1 , further comprising Ca: 0.0001% to 0.0050% on a percent by mass basis in the composition.4. The method for manufacturing a high strength cold rolled steel sheet according to claim 3 , wherein the steel further contains Ca: 0.0001% to 0.0050% on a percent by mass basis in the composition. This application is the U.S. National Phase application of PCT International Application No. PCT/JP2011/070665, filed Sep. 5, 2011, and claims priority to Japanese Patent Application Nos. 2010-199040, filed Sep. 6, 2010, and 2011-179329, filed Aug. 19, 2011, the disclosures of each of these being incorporated herein by reference in their entireties for all purposes.The present invention relates to a high strength cold rolled steel sheet suitable for use as automobile parts and the like, which are press-formed into complicated shapes. In particular, the present invention relates to an improvement in stretch flangeability. Here, a term “high strength steel sheet” refers to a steel sheet having high strength of a tensile strength: 590 MPa or more. In addition, a term “steel sheet” here ...

Alloy of a Golf Club

An alloy of a golf club comprises 0.25 wt % to 1.0 wt % Si, 0.25 wt % to 1.5 wt % Mn, 2.0 wt % to 3.5 wt % Cu, 6.0 wt % to 8.0 wt % Ni, 15.5 wt % to 18.0 wt % Cr, balance iron and inevitable impurities, wherein the alloy of a golf club has austenite structures, ferrite structures, and martensite structures simultaneously. 1. An alloy of a golf club comprising:0.25 wt % to 1.0 wt % Si;0.25 wt % to 1.5 wt % Mn;2.0 wt % to 3.5 wt % Cu;6.0 wt % to 8.0 wt % Ni;15.5 wt % to 18.0 wt % Cr; andbalance iron and inevitable impurities, wherein the alloy of a golf club has austenite structures, ferrite structures, and martensite structures.2. The alloy of a golf club as claimed in claim 1 , wherein Ni is in a range of 6.5 wt % to 8.0 wt %.3. The alloy of a golf club as claimed in claim 1 , wherein Si is in a range of 0.5 wt % to 1.0 wt %.4. The alloy of a golf club as claimed in claim 1 , wherein Mn is in a range of 0.5 wt % to 1.5 wt %.5. The alloy of a golf club as claimed in claim 1 , wherein Cu is in a range of 2.5 wt % to 3.5 wt %.6. The alloy of a golf club as claimed in claim 1 , wherein Cr is in a range of 16.0 wt % to 17.5 wt %.7. The alloy of a golf club as claimed in claim 1 , wherein the alloy of a golf club further comprises carbon being less than 0.08 wt %. 1. Field of the InventionThe present invention generally relates to an alloy of a golf club and, more particularly, to an alloy of a golf club that is apt to provide preferable shock-absorbing effect.2. Description of the Related ArtGenerally, an integral forming hosel portion of a golf club requires easy justifying a dipangle thereof, in accordance with different requirements of various users. Accordingly, conventional golf club is primary made of soft iron having lower hardness, such as materials like low-carbon steel and low-alloy steel, so as to facilitate dipangle-justifying of the hosel portion of a golf club requires. However, the soft iron has disadvantages of easily-oxidized and corrosion- ...

HIGH-STRENGTH STEEL SHEET AND HIGH-STRENGTH ZINC-COATED STEEL SHEET WHICH HAVE EXCELLENT DUCTILITY AND STRETCH-FLANGEABILITY AND MANUFACTURING METHOD THEREOF

This high-strength steel sheet includes by mass percentage: 0.05 to 0.4% of C; 0.1 to 2.5% of Si; 1.0 to 3.5% of Mn; 0.001 to 0.03% of P; 0.0001 to 0.01% of S; 0.001 to 2.5% of Al; 0.0001 to 0.01% of N; 0.0001 to 0.008% of O; and a remainder composed of iron and inevitable impurities, wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase, wherein a 98% hardness is 1.5 or more times as high as a 2% hardness in a range from ⅛ to ⅜ of a thickness of the steel sheet, wherein a kurtosis K* of the hardness distribution between the 2% hardness and the 98% hardness is −1.2 to −0.4, and wherein an average crystal grain size in the steel sheet structure is 10 μm or less. 1. A high-strength steel sheet which has an excellent ductility and a stretch-flangeability , the steel sheet comprising by mass percentage:0.05 to 0.4% of C;0.1 to 2.5% of Si;1.0 to 3.5% of Mn;0.001 to 0.03% of P;0.0001 to 0.01% of S;0.001 to 2.5% of Al;0.0001 to 0.01% of N;0.0001 to 0.008% of O; anda remainder composed of iron and inevitable impurities,wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase,wherein when a plurality of measurement regions with diameters of 1 μM or less are set in a range from ⅛ to ⅜ of a thickness of the steel sheet, hardness measurement values in the plurality of measurement regions are arranged in ascending order to obtain a hardness distribution, an integer N0.02 which is a number obtained by multiplying a total number of the hardness measurement values by 0.02 and, if present, by rounding up a decimal number, is obtained, a hardness of a measurement value which is an N0.02-th largest value from a smallest hardness measurement value is regarded as a 2% hardness, an integer N0.98 which is a number obtained by multiplying the total number of the hardness measurement ...

SUPER BAINITE STEEL AND METHOD FOR MANUFACTURING IT

The invention relates to a super bainite steel consisting of the following elements in weight %: C: 0.4-1.1 Mn: 0.4-2.1 Si: 0.15-1.2 Al: 0.0-2.0 Cr: 0.0-1.4 Ni: 0.0-2.5 Mo: 0.0-0.6 V: 0.0-0.3 Co: 0.0-3.0 P: <0.025 S: <0.025 the balance being iron and unavoidable impurities. The invention also relates to a method for manufacturing such a super bainite steel. 1. Super bainite steel consisting of the following elements in weight %:C: 0.4-1.1Mn: 0.4-2.1Si: 0.15-1.2Al: 0.0-2.0Cr: 0.0-1.4Ni: 0.0-2.5Mo: 0.0-0.6V: 0.0-0.3Co: 0.0-3.0P: <0.025S: <0.025the balance being iron and unavoidable impurities.2. Super bainite steel according to claim 1 , wherein the following elements are present in weight %:C: 0.4-1.0 and/orMn: 0.7-2.1 and/orSi: 0.4-1.1 and/orAl: 0.0-1.0 and/orCr: 0.3-1.2 and/orNi: 0.0-1.0 and/orMo: 0.01-0.4 and/orV: 0.0-0.2 and/orCo: 0.0-2.0.3. Super bainite steel according to claim 2 , wherein the following elements are present in weight %:C: 0.6-0.9 and/orMn: 0.8-1.4 and/orSi: 0.7-1.0 and/orAl: <0.1 and/orCr: 0.7-1.1 and/orMo: 0.01-0.2 and/orNi: <0.1 and/orV: <0.1 and/orCo: <0.5.4. (canceled)5. Super bainite steel according to claim 1 , wherein the steel is provided in the form of plates claim 1 , strip and/or sheets having a thickness dimension of 0-25 mm claim 1 , preferably a thickness of 2-15 mm claim 1 , and a width dimension of at least 400 mm.6. Super bainite steel according to claim 1 , wherein the steel has a microstructure of retained austenite up to 30 percent with a balance of carbide-free bainite laths and bainite laths with intra-granular carbides present claim 1 , the bainite laths having an average thickness below 100 nm.7. Super bainite steel according to claim 1 , wherein the steel is provided in plates having perforations providing a weight reduction of 0-50% claim 1 , the perforations preferably having an opening width or a diameter between 2 and 15 mm.8. Super bainite steel according to claim 5 , wherein the plate has been leveled to achieve a ...

High strength hot rolled steel sheet having excellent bendability and method for manufacturing the same

A steel sheet including C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.0030%, Al at 0.005 to 0.10%, N at not more than 0.005% and Ti at 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes surface regions having an area fraction of bainite of less than 80% and an area fraction of a ferrite phase with a grain diameter of 2 to 15 μm of not less than 10%, the surface regions extending from both surfaces of the steel sheet each to a depth of 1.5 to 3.0% relative to a total sheet thickness, as well as an inner region other than the surface regions having an area fraction of a bainite phase of more than 95%, and has a tensile strength of not less than 780 MPa.

Low Iron Loss High Strength Non-Oriented Electromagnetic Steel Sheet and Method for Manufacturing Same

Provided is a low iron loss high strength non-oriented electromagnetic steel sheet and a method for manufacturing the same. The method comprises hot-rolling a slab comprising 0.005 weight % or less of C, 4.0 weight % or less of Si, 0.1 weight % or less of P, 0.03 weight % or less of S, 0.1 to 2.0 weight % of Mn, 0.3 to 2.0 weight % of Al, 0.003 weight % or less of N, 0.005 weight % or less of Ti, the remainder being Fe and unavoidable impurities, cold-rolling the slab, and finally annealing the slab such that the fractional area of the non-recrystallization tissue at the cross sectional surface of the steel sheet is 50% or lower (not including 0%).

GRAIN ORIENTED STEEL STRIP WITH HIGH MAGNETIC CHARACTERISTICS, AND MANUFACTURING PROCESS OF THE SAME

A method for the production of hot-rolled steel strip comprising the following steps: providing a steel slab comprising, in weight percentages: Si: 2.5 to 3.5%, C: 0.05 to 0.1%, Mn: 0:05 to 0.1%, Als: 0.015 to 0.026%, N: 0.0050 to 0.0100%, and further comprising S and/or Se so that S+ (32/79) Se is in an amount of 0.018 to 0.030%, and optionally comprising one or more elements chosen among Sb in an amount of 0.015 to 0.035%, Cu in an amount of 0.08% to 0.25%, Sn in an amount of 0.06% to 0.15%, P in an amount of 0.005% to 0.015%, the balance being iron and unavoidable impurities, reheating said slab to a temperature between 1300° C. and 1430° C., roughing hot-rolling said slab to produce a blank having a thickness below 50 mm, finishing hot-rolling of said blank to produce a hot rolled strip in three rolling passes or more, the temperature of said blank during the first pass being above 1150° C. and at least one rolling pass being performed with a reduction of 40% or more and being immediately followed by a holding of more than 20 sec, the average interpass holding temperature Tav being settled between 1000 and 1200° C., the total finishing hot rolling time t being controlled so that the value of Tav for any portion of said strip further respects the under mentioned equation: T>T+α(t−78) [eq. 1] with T=992.2+1493(Als) and α=1.204+24.9(Als), Tand being expressed in ° C., t in seconds and Alin weight %, cooling of said hot-rolled strip from the finish rolling temperature to a temperature below 600° C. in less than 10 sec and coiling of said hot-rolled strip. 1. A method for the production of hot-rolled steel strip comprising the successive following steps , in this order: Si: 2.5 to 3.5%,', 'C: 0.05 to 0.1%,', 'Mn: 0.05 to 0.1%,', 'Als: 0.015 to 0.026%,', 'N: 0.0050 to 0.0100%,, 'providing a steel slab comprising, in weight percentagesand further comprising S and/or Se so that S+ (32/79) Se is in an amount of 0.018 to 0.030%,optionally comprising one or more elements ...

High-Strength Steel Material Having Outstanding Ultra-Low-Temperature Toughness and a Production Method Therefor

The present invention provides steel containing manganese and nickel that is used as a structural material for a cryogenic storage container for liquefied natural gas (LNG) or the like, and a manufacturing method thereof; and more particularly, to steel having good cryogenic temperature toughness and also high strength by adding low-cost Mn instead of relatively expensive Ni at an optimized ratio, refining a microstructure through controlled rolling and cooling, and precipitating retained austenite through tempering, and a manufacturing method of the steel. To achieve the object, the technical feature of the present invention is a method of manufacturing high-strength steel with cryogenic temperature toughness. In the method, a steel slab is heated to a temperature within a range of 1,000 to 1,250° C., wherein the steel slab includes, by weight: 0.01-0.06% of carbon (C), 2.0-8.0% of manganese (Mn), 0.01-6.0% of nickel (Ni), 0.02-0.6% of molybdenum (Mo), 0.03-0.5% of silicon (Si), 0.003-0.05% of aluminum (Al), 0.0015-0.01% of nitrogen (N), 0.02% or less of phosphorous (P), 0.01% or less of sulfur (S), with a remainder of iron (Fe) and other unavoidable impurities. Then, the heated slab is finish-rolled at a temperature of 950° C. or less at a rolling reduction rate of 40% or more. The rolled steel is cooled to a temperature of 400° C. or less at a cooling rate of 2° C./s or more. Thereafter, the steel is tempered for 0.5-4 hours to a temperature within a range of 550 to 650° C. after the cooling. 1. High-strength steel with good cryogenic temperature toughness , comprising , by weight: 0.01-0.06% of carbon (C) , 2.0-8.0% of manganese (Mn) , 0.01-6.0% of nickel (Ni) , 0.02-0.60 of molybdenum (Mo) , 0.03-0.5% of silicon (Si) , 0.003-0.050 of aluminum (Al) , 0.0015-0.01% of nitrogen (N) , 0.02% or less of phosphorous (P) , 0.01% or less of sulfur (S) , with a remainder of iron (Fe) and other unavoidable impurities.2. The high-strength steel with good cryogenic ...

STEEL PLATE FOR PRODUCING LIGHT STRUCTURES AND METHOD FOR PRODUCING SAID PLATE

The invention relates to a steel plate, the chemical composition of which comprises, the contents being expressed by weight: 0.010%≦C≦0.20%, 0.06%≦Mn≦3%, Si≦1.5%, 0.005%≦Al≦1.5%, S≦0.030%, P≦0.040%, 2.5%≦Ti≦7.2%, (0.45×Ti)−0.35%≦B≦(0.45×Ti)+0.70%, and optionally one or more elements chosen from: Ni≦1%, Mo≦1%, Cr≦3%, Nb≦0.1%, V≦0.1%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting. 1: A steel plate , the chemical composition of which comprises steel , the contents being expressed by weight:0.010%≦C≦0.20%0.06%≦Mn≦3%Si≦1.5%0.005%≦Al≦1.5%S≦0.030%P≦0.040%,titanium and boron in amounts such that:2.5%≦Ti≦7.2%(0.45×Ti)−0.35%≦B≦(0.45×Ti)+0.70%optionally one or more elements chosen from:Ni≦1%Mo≦1%Cr≦3%Nb≦0.1%V≦0.1%,the balance of the composition consisting of iron and inevitable impurities resulting from the smelting.2. The steel plate as claimed in claim 1 , wherein the titanium and boron contents are such that:−0.22≦B−(0.45×Ti)≦0.35.3. The steel plate as claimed in claim 1 , wherein the titanium and boron contents are such that:−0.35≦B−(0.45×Ti)<−0.22.4. The steel plate of claim 1 , characterized in that the titanium content is such that:4.6%≦Ti≦6.9%.5. The steel plate as claimed in claim 4 , wherein the titanium content is such that:4.6%≦Ti≦6%.6. The steel plate of claim 1 , wherein its composition comprises claim 1 , the content being expressed by weight:C≦0.080%.7. The steel plate of claim 1 , wherein its composition comprises claim 1 , the content being expressed by weight:C≦0.050%.8. The steel plate of claim 1 , wherein its composition comprises claim 1 , the content being expressed by weight:Cr≦0.08%.9. The steel plate of claim 1 , wherein it comprises TiBand optionally FeB eutectic precipitates claim 1 , the mean size of which is equal to or less than 15 microns.10. The steel plate of claim 1 , wherein it comprises TiBand optionally FeB eutectic precipitates claim 1 , the mean size of which is equal to or less ...

CASE HARDENED STEEL AND METHOD FOR PRODUCING SAME

A case hardened steel with excellent cold forgeability and excellent impact properties after case hardening processing contains C, Si, Mn, S, Cr, Al, Ti, Nb, B, and N, with the balance being iron and unavoidable impurities. Of precipitates containing Ti and/or Nb, precipitates having a size of not less than 20 μmare at a number density of not more than 1.0/mm. Of precipitates containing Ti and/or Nb, precipitates having a size of more than 5 μmand less than 20 μmand containing Mn and S are at a number density of more than 0.7/mmand not more than 3.0/mm. The ferrite fraction is more than 77% by area. 1. A case hardened steel comprising:C: 0.05 to 0.3% (% by mass; hereinafter the same applies to chemical component composition),Si: 0.01 to 0.6%,Mn: 0.20 to 1.0%,S: 0.001 to 0.025%,Cr: 1 to 2.5%,Al: 0.01 to 0.10%,Ti: 0.01 to 0.10%,Nb: 0.01 to 0.10%,B: 0.0005 to 0.005%, andN: 0.002 to 0.02%, with the balance being iron and unavoidable impurities,{'sup': 2', '2, 'wherein, of precipitates containing Ti and/or Nb, precipitates having a size of not less than 20 μmare at a number density of not more than 1.0/mm,'}{'sup': 2', '2', '2', '2, 'wherein, of precipitates containing Ti and/or Nb, precipitates having a size of more than 5 μmand less than 20 μmand containing Mn and S are at a number density of more than 0.7/mmand not more than 3.0/mm, and'}wherein the ferrite fraction is more than 77% by area.2. The case hardened steel according to claim 1 , further comprising Mo: not more than 2% (excluding 0%).3. The case hardened steel according to claim 1 , further comprising Cu: not more than 0.1% (excluding 0%) and/or Ni: not more than 0.3% (excluding 0%).4. A method for producing a case hardened steel claim 1 , comprising{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'subjecting a steel having the chemical component composition of to'}casting at a cooling rate of not less than 2.5° C./min from 1500° C. to 800° C.,blooming at a heating temperature of 1100 to 1200° C., and{'sub ...

BEARING STEEL AND INGOT MATERIAL FOR BEARING HAVING EXCELLENT ROLLING CONTACT FATIGUE LIFE CHARACTERISTICS AND METHOD FOR MANUFACTURING THE SAME

The present invention provides bearing steel, comprising a chemical composition including by mass %, C: 0.56%≧[% C]≦0.70%, Si: 0.15%≦[% Si]<0.50%, Mn: 0.60%≦[% Mn]≦1.50%, Cr: 0.50%≦[% Cr]≦1.10%, Mo: 0.05%≦[% Mo]≦0.5%, P: [% P]≦0.025%, S: [% S]≦0.025%, Al: 0.005%≦[% Al]≦0.500%, O: [% O]≦0.0015%, N: 0.0030%≦[% N]≦0.015%, and remainder as Fe and incidental impurities. 1. Bearing steel , comprising a chemical composition including by mass % ,C: 0.56% to 0.70% (inclusive of 0.56% and 0.70%),Si: 0.15% to 0.50% (inclusive of 0.15% and exclusive of 0.50%)Mn: 0.60% to 1.50% (inclusive of 0.60% and 1.50%),Cr: 0.50% to 1.10% (inclusive of 0.50% and 1.10%),Mo: 0.05% to 0.5% (inclusive of 0.05% and 0.5%),P: 0.025% or less,S: 0.025% or lessAl: 0.005% to 0.500% (inclusive of 0.005% and 0.500%),O: 0.0015% or lessN: 0.0030% to 0.015% (inclusive of 0.0030% and 0.015%), and remainder as Fe and incidental impurities, [{'br': None, 'i': 'Ec', '=(−0.07×[% Si]−0.03×[% Mn]+0.04×[% Cr]−0.36×[% Al]+0.79)−[% C]\u2003\u2003(1)'}, {'br': None, 'i': C', '/C, 'sub': Mo(max)', 'Mo(ave), 'Degree of segregation=\u2003\u2003(2)'}], 'wherein “eutectic carbide formation index Ec” represented by following formula (1) is in the range of 0 Подробнее

HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

A method for manufacturing such steel sheet includes continuous annealing of a steel sheet which includes, in terms of mass %, C at 0.01 to 0.18%, Si at 0.4 to 2.0%, Mn at 1.0 to 3.0%, Al at 0.001 to 1.0%, P at 0.005 to 0.060% and S at ≦0.01%, the balance being represented by Fe and inevitable impurities, in such a manner that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of soaking when the annealing furnace inside temperature is in the range of not less than 820° C. and not more than 1000° C. as well as that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of cooling when the annealing furnace inside temperature is in the range of not less than 750° C. 1. A method for manufacturing high strength steel sheets , comprising continuous annealing of a steel sheet which includes , in terms of mass % , C at 0.01 to 0.18% , Si at 0.4 to 2.0% , Mn at 1.0 to 3.0% , Al at 0.001 to 1.0% , P at 0.005 to 0.060% and S at ≦0.01% , the balance being represented by Fe and inevitable impurities , in such a manner thatthe dew point of the atmosphere is controlled to become not more than −45° C. during the course of soaking when the annealing furnace inside temperature is in the range of not less than 820° C. and not more than 1000° C. as well as that the dew point of the atmosphere is controlled to become not more than −45° C. during the course of cooling when the annealing furnace inside temperature is in the range of not less than 750° C.2. The method for manufacturing high strength steel sheets according to claim 1 , wherein the chemical composition of the steel sheet further includes one or more elements selected from B at 0.001 to 0.005% claim 1 , Nb at 0.005 to 0.05% claim 1 , Ti at 0.005 to 0.05% claim 1 , Cr at 0.001 to 1.0% claim 1 , Mo at 0.05 to 1.0% claim 1 , Cu at 0.05 to 1.0% and Ni at 0.05 to 1.0% in terms of mass %.3. The method for manufacturing high strength steel sheets ...

High-Toughness Cold-Drawn Non-Heat-Treated Wire Rod, and Method for Manufacturing Same

Provided is a wire rod for use in mechanical structure connections, vehicle components, or the like, and more particularly, to a wire rod which has superior toughness without being subjected to a heat treatment, and the strength of which is ensured through a cold-drawing process. Tot his end, provided are a high-toughness cold-drawn non-heat-treated wire rod and a method for manufacturing the same, wherein the wire rod comprises in % by weight: 0.2 to 0.3% of carbon (C), 0.1 to 0.2% of silicon (Si), 2.5 to 4.0% of manganese (Mn), 0.035% or less (but not 0%) of phosphorus (P), 0.04% or less (but not 0%) of sulfur (S), the remainder being iron (Fe) and unavoidable impurities. 1. A high toughness cold-drawn non-heat treated wire rod comprising carbon (C): 0.2-0.3% , silicon (Si): 0.1-0.2% , manganese (Mn): 2.5-4.0% , phosphorus (P): 0.035% or less (except 0) , sulfur (S): 0.04% or less (except 0) , the remainder iron (Fe) , and other inevitable impurities , as a percentage by weight.2. The high toughness cold-drawn non-heat treated wire rod of claim 1 , wherein the microstructure of the wire rod comprises de-generated pearlite.3. The high toughness cold-drawn non-heat treated wire rod of claim 2 , wherein the de-generated pearlite has an area fraction of not less than 90% claim 2 , and the remainder is ferrite.4. The high toughness cold-drawn non-heat treated wire rod of claim 2 , wherein the de-generated pearlite comprises cementite having a thickness of not more than 100 nm.5. The high toughness cold-drawn non-heat treated wire rod of claim 2 , wherein the de-generated pearlite comprises cementite having an aspect ratio (width:thickness) of 30:1 or less.6. The high toughness cold-drawn non-heat treated wire rod of claim 1 , wherein the wire rod has a tensile strength ranging from 650 Mpa to 750 Mpa.7. The high toughness cold-drawn non-heat treated wire rod of claim 1 , wherein the wire rod has a tensile strength ranging from 1300 Mpa to 1500 Mpa and a V-impact ...

AUSTENITE-FERRITE STAINLESS STEEL OF IMPROVED MACHINABILITY

The invention concerns an austenite-ferrite stainless steel composition, whose composition contains in % by weight: 2. Steel according to claim 1 , moreover characterized in that:IRCGU≧34.3. Steel according to any one of to claim 1 , moreover characterized in that the proportion of ferrite is between 35 and 55% by volume.4. Steel according to any one of to claim 1 , moreover characterized in that45≦IF≦555. Steel according to any one of to claim 1 , moreover characterized in that the nitrogen content is between 0.12 and 0.18% by weight.6. Steel according to any one of to claim 1 , moreover characterized in that the copper content is between 2.0 and 2.8% by weight.7. Steel according to any one of to claim 1 , moreover characterized in that the molybdenum content is less than 0.5% by weight.8. Steel according to any one of to claim 1 , moreover characterized in that the carbon content is less than 0.05% by weight.9. Method of manufacture of a plate claim 1 , a band claim 1 , or a coil of hot-rolled steel according to any one of to claim 1 , in which:{'claim-ref': [{'@idref': 'CLM-00001', 'claims 1'}, {'@idref': 'CLM-00008', '8'}], 'one provides an ingot or a slab of a steel with a composition according to any one of to ,'}one hot-rolls said ingot or said slab at a temperature between 1150 and 1280° C. to obtain a plate, a band, or a coil.10. Method of manufacture of a hot-rolled plate of steel according to claim 9 , in which:one hot rolls said ingot or said slab at a temperature between 1150 and 1280° C. to obtain a so-called quarto plate, thenone performs a heat treatment at a temperature between 900 and 1100° C., andone cools said plate by quenching in air.12. Method of manufacture according to claim 11 , whereby one performs a cold drawing of said bar or a wire drawing of said wire claim 11 , at the end of the cooling.13. Method of manufacture of a steel profile claim 11 , whereby one performs a cold profiling of a hot-rolled bar obtained by the method of .14. ...

High-Carbon Hot-Rolled Steel Sheet, High-Carbon Cold-Rolled Steel Sheet, and Method of Manufacturing the Same

Provided is a method of manufacturing a high-carbon hot-rolled steel sheet, including the steps of i) preparing high-carbon steel materials comprising C: 0.7 to 0.9%, Si: 0.5% or less, Mn: 0.1 to 1.5%, Cr: 0.5% or less, P: 0.05% or less, and S: 0.03% or less in wt % and remaining Fe and other inevitable impurities; ii) heating the high-carbon steel materials again and manufacturing a steel sheet by performing hot rolling in an austenite region in which a finishing temperature for the hot rolling is an Ar3 transformation temperature or higher; iii) rapidly cooling the steel sheet at 520 to 620° C. before phase transformation is started in a Run-Out Table (ROT); iv) uniformly maintaining a cooling retention temperature so that the cooled steel sheet is subject to phase transformation in any one temperature between 520 to 620° C.; and v) winding the steel sheet in the cooling retention temperature. Also provided is the high-carbon steel sheet made by the above-described method. 1. A method of manufacturing a high-carbon hot-rolled steel sheet , comprising the steps of:preparing high-carbon steel materials comprising C: 0.7 to 0.9% , Si: 0.5% or less , Mn: 0.1 to 1.5% , Cr: 0.5% or less , P: 0.05% or less , and S: 0.03% or less in wt % , remaining Fe , and other inevitable impurities;heating the high-carbon steel materials again and manufacturing a steel sheet by performing hot rolling in an austenite region in which a finishing temperature for the hot rolling is an Ar3 transformation temperature or higher;rapidly cooling the steel sheet at 520 to 620° C. before phase transformation is started in a Run-Out Table (ROT);uniformly maintaining a cooling retention temperature so that the cooled steel sheet is subject to phase transformation in any one temperature between 520 to 620° C.;winding the steel sheet in the cooling retention temperature.2. The method of claim 1 , wherein in the step of rapidly cooling the steel sheet claim 1 , the steel sheet has a phase ...

Steel Sheet for Enamel Having No Surface Defects and Method of Manufacturing the Same

A steel sheet for enameling for eliminating surface defects such as fish scale defects and having excellent formability, and provides a steel sheet for enamel having no surface defects, including: more than 0 wt % and 0.005 wt % or less of C, 0.1 to 0.5 wt % of Mn, more than 0 wt % and 0.03 wt % or less of Si, 0.05 to 0.3 wt % of Cr, more than 0 wt % and 0.03 wt % or less of Al, 0.03 to 0.1 wt % of O, more than 0 wt % and 0.03 wt % or less of P, more than 0 wt % and 0.02 wt % or less of S, more than 0 wt % and 0.015 wt % or less of Cu, more than 0 wt % and 0.005 wt % or less of N, Fe in a remaining content, and other inevitable impurities. 1. A steel sheet for enamel having no surface defects , comprising:more than 0 wt % and 0.005 wt % or less of C, 0.1 to 0.5 wt % of Mn, more than 0 wt % and 0.03 wt % or less of Si, 0.05 to 0.3 wt % of Cr, more than 0 wt % and 0.03 wt % or less of Al, 0.03 to 0.1 wt % of O, more than 0 wt % and 0.03 wt % or less of P, more than 0 wt % and 0.02 wt % or less of S, more than 0 wt % and 0.015 wt % or less of Cu, more than 0 wt % and 0.005 wt % or less of N, Fe in a remaining content, and other inevitable impurities.2. The steel sheet for enamel having no surface defects of claim 1 , wherein:a Cr—Mn complex oxide is formed in the steel sheet for enamel.3. The steel sheet for enamel having no surface defects of claim 2 , wherein:an atomic ratio of Cr/Mn in the Cr—Mn complex oxide is in the range of 0.01 to 2.4. The steel sheet for enamel having no surface defects of claim 3 , wherein:a size of the Cr—Mn complex oxide is 1 to 25 m.5. The steel sheet for enamel having no surface defects of claim 4 , wherein:{'sup': 2', '2, 'the number of the Cr—Mn complex oxides is 1.5×10or more per 1 mmof an observation view.'}6. A method of manufacturing a steel sheet for enamel having no surface defects claim 4 , comprising:manufacturing a slab formed of more than 0 wt % and 0.005 wt % or less of C, 0.1 to 0.5 wt % of Mn, more than 0 wt % and 0.03 wt % ...

Soft magnetic powder, granulated powder, dust core, electromagnetic component, and method for producing dust core

Provided are a soft magnetic powder for obtaining a dust core having a low iron loss, the dust core, and a method for producing a dust core. The present invention relates to a soft magnetic powder including a plurality of soft magnetic particles, each having an insulating layer. The Vickers hardness HV0.1 of a material constituting the soft magnetic particles is 300 or more, and the insulating layer contains Si, O, and at least one of an alkali metal and Mg. As long as the soft magnetic powder has such features, a material having a high electric resistance, such as an iron-based alloy, can be used. The eddy current loss can be reduced, and it is possible to effectively obtain a dust core having a low iron loss.

BEARING STEEL

Provided is a bearing steel capable of exhibiting excellent cold workability in cold working that follows spheroidizing annealing and also capable of ensuring excellent abrasion resistance and rolling fatigue characteristics as a bearing member or the like. The bearing steel contains C: 0.9 to 1.10%, Si: 0.05 to 0.49%, Mn: 0.1 to 1.0%, P: not more than 0.05% (excluding 0%), S: not more than 0.05% (excluding 0%), Cr: 0.03 to 0.40%, Al: not more than 0.05% (excluding 0%), N: 0.002 to 0.025%, Ti: not more than 0.0030% (excluding 0%), and 0: not more than 0.0025% (excluding 0%), with the remainder being iron and unavoidable impurities. The average aspect ratio of cementite is not more than 2.00, the average circle-equivalent diameter of cementite is 0.35 to 0.6 μm, and the number density of cementite having a circle-equivalent diameter of not less than 0.13 μm is not less than 0.45/μm. 1. A steel comprising:ironC: 0.9 to 1.10 mass %,Si: 0.05 to 0.49 mass %,Mn: 0.1 to 1.0 mass %,P: more than 0 but at most 0.05 mass %,S: more than 0 but at most 0.05 mass %,Cr: 0.03 to 0.40 mass %,Al: more than 0 but at most 0.05 mass %,N: 0.002 to 0.025 mass %,Ti: more than 0 but at most 0.0030 mass %, andO: more than 0 but at most 0.0025 mass %,whereinan average aspect ratio of cementite is at most 2.00,an average circle-equivalent diameter of cementite is 0.35 to 0.6 μm, and{'sup': '2', 'a number density of cementite having a circle-equivalent diameter of at least 0.13 μm is at least 0.45/μm.'}2. The steel according to claim 1 , further comprising claim 1 , at least one member selected from the group consisting of Cu: more than 0 but at most 0.25 mass % claim 1 , Ni: more than 0 but at most 0.25 mass % claim 1 , and Mo: more than 0 but at most 0.25 mass %.3. The steel according to claim 1 , further comprisingNb: more than 0 but at most 0.5 mass %,V: more than 0 but at most 0.5 mass %, or both.4. The steel according to claim 1 , wherein the average aspect ratio of cementite is at most 1. ...

PROFILED STEEL WIRE WITH HIGH MECHANICAL CHARACTERISTICS RESISTANT TO HYDROGEN EMBRITTLEMENT

This profiled wire, of NACE grade, made of low-alloy carbon steel intended to be used in the offshore oil exploitation sector, is characterized in that it has the following chemical composition, expressed in percentages by weight of the total mass: 0.75<% C<0.95; 0.30<% Mn<0.85; Cr≦0.4%; V≦0.16%; Si≦1.40% and preferably ≧0.15%; and optionally no more than 0.06% Al, no more than 0.1% Ni and no more than 0.1% Cu, the balance being iron and the inevitable impurities arising from smelting the metal in the liquid state, and in that the steel is obtained, from hot-rolled rod stock cooled down to room temperature, and then having a diameter of about 5 to 30 mm, by subjecting this starting rod firstly to a thermomechanical treatment comprising two successive steps carried out in order, namely an isothermal quench, giving it a homogeneous perlitic microstructure, followed by a mechanical transformation operation carried out cold with an overall degree of work-hardening (or reduction ratio) of between 50 and 80% at most, so as to give the wire its definitive shape, and in that the profiled wire thus obtained is then subjected to a restoration heat treatment of short duration carried out below Ac1 (preferably between 410 and 710° C.), giving it the desired final mechanical properties. 2. A profiled wire according to claim 1 , characterized in that its isothermal quenching is a patenting operation in lead.3. A profiled wire according to claim 1 , characterized in that its recovery treatment is carried out with a temperature of between 410 and 710° C. for a duration not exceeding one minute. The present invention relates to the field of metallurgy dedicated to offshore oil and gas operations. It relates more particularly to steel wires usable as reinforcing or structural elements of components or constructions submerged in deep water, such as the flexible offshore pipelines.It is known that a primary requirement concerning the wires of this type is, in addition to elevated ...

Carburizing steel having excellent cold forgeability and method of manufacturing the same

A carburizing steel has a composition containing, in mass %, C: 0.1-0.35%; Si: 0.01-0.22%; Mn: 0.3-1.5%; Cr: 1.35-3.0%; P: 0.018% or less; S: 0.02% or less; Al: 0.015-0.05%; N: 0.008-0.015%; and O: 0.0015% or less, each being contained in an amount within a range satisfying formulas (1), (2) and (3) below, and the balance of the composition being Fe and incidental impurities, and the carburizing steel having microstructures before spheroidizing annealing such that a total microstructure proportion of ferrite and pearlite is 85% or more and an average ferrite grain size is 25 μm or less. 3.1≧{([% Si]/2)+[% Mn]+[% Cr]}≧2.2   (1) [% C]−([% Si]/2)+([% Mn]/5)+2[% Cr]≧3.0   (2) 2.5≧[% Al]/[% N]≧1.7   (3) [% M] represents content (in mass %) of element M.

HOT-ROLLED STEEL SHEET HAVING EXCELLENT COLD FORMABILITY AND HARDENABILITY AND METHOD FOR MANUFACTURING THE SAME

Hot-rolled steel has a chemical composition containing, by mass%, C: 0.18% or more and 0.29% or less, N: 0.0050% or less, Ti: 0.002% or more and 0.05% or less, B: 0.0005% or more and 0.0050% or less, and appropriately controlled amounts of Si, Mn, P, S, Al, and a tensile strength of 500 MPa or less with a variation in tensile strength of 60 MPa or less throughout a region including the edges in the width direction of the steel sheet, and having excellent cold formability and hardenability. 2. The hot-rolled steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , by mass% claim 1 , one or both of Nb and V: 0.1% or less in total.3. The hot-rolled steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , by mass% claim 1 , one or more of Ni claim 1 , Cr and Mo: 1.5% or less in total.4. The hot-rolled steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , by mass% claim 1 , one or both of Sb and Sn: 0.1% or less in total.5. The hot-rolled steel sheet according to claim 1 , wherein the steel sheet has a variation in tensile strength ΔTS of 60 MPa or less throughout a region that is on an inner side 5 mm from edges in a width direction of the steel sheet.6. A method for manufacturing a hot-rolled steel sheet having excellent cold formability and hardenability claim 1 , comprising:hot-rolling a steel having a chemical composition comprising, by mass%, C: 0.18% or more and 0.29% or less, Si: 1% or less, Mn: 1.5% or less, P: 0.1% or less, S: 0.03% or less, sol.Al: 0.1% or less, N: 0.0050% or less, Ti: 0.002% or more and 0.05% or less, B: 0.0005% or more and 0.0050% or less and the balance being Fe and inevitable impurities with a finishing temperature of 800° C. or higher and 900° C. or lower and thereafter,cooling the resulting hot-rolled steel sheet at a mean cooling rate of 20° C/s or less, andcoiling the resulting hot-rolled steel sheet at a coiling ...

STEEL PART FOR MACHINE STRUCTURAL USE AND MANUFACTURING METHOD THEREOF

The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: 0.05 to 0.20%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 μm or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.

STEEL PART FOR MACHINE STRUCTURAL USE AND MANUFACTURING METHOD THEREOF

The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.20 to 0.25%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 μm or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more. 1. A steel part for machine structural use made of a steel containing ,in mass %,C: 0.05 to 0.20%,Si: 0.10 to 1.00%,Mn: 0.75 to 3.00%,P: 0.001 to 0.050%,S: 0.001 to 0.200%,V: exceeding 0.20 to 0.25%,Cr: 0.01 to 1.00%,Al: 0.001 to 0.500%, andN: 0.0080 to 0.0200%, anda balance being composed of Fe and inevitable impurities, whereina steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 μm or less,V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, andan area ratio of V carbide in the bainite structure is 0.18% or more.2. The steel part for machine structural use according to claim 1 , whereinthe steel further contains one type or two types or more of, in mass %,Ca: 0.0003 to 0.0100%,Mg: 0.0003 to 0.0100%, andZr: 0.0005 to 0.1000%.3. The steel part for machine structural use according to claim 1 , whereinthe steel further contains one type or two types of, in mass %,Mo: 0.01 to 1.00%, andNb: 0.001 to 0.200%.4. The steel part for machine structural use according to claim 1 , wherein Charpy absorbed energy at 20° C. is 80 J/cmor more and an endurance ratio is 0. ...

BEARING STEEL BEING EXCELLENT BOTH IN POST SPHEROIDIZING-ANNEALING WORKABILITY AND IN POST QUENCHING-TEMPERING HYDROGEN FATIGUE RESISTANCE PROPERTY

Provided is bearing steel excellent in post spheroidizing-annealing workability and in post quenching-tempering hydrogen fatigue resistance property. The bearing steel has a chemical composition containing, by mass %: 0.85% to 1.10% C; 0.30% to 0.80% Si; 0.90% to 2.00% Mn; 0.025% or less P; 0.02% or less S; 0.05% or less Al; 1.8% to 2.5% Cr; 0.15% to 0.4% Mo; 0.0080% or less N; 0.0020% or less O; and the balance being Fe and incidental impurities, to thereby effectively suppress the generation of WEA even in environment where hydrogen penetrates into the steel, so as to improve the rolling contact fatigue life and also the workability such as cuttability and forgeability of the material. 1. Bearing steel having a chemical composition containing , by Mass %:C: 0.85% to 1.10%;Si: 0.30% to 0.80%;Mn: 0.90% to 2.00%;P: 0.025% or less;S: 0.02% or less;Al: 0.05% or less;Cr: 1.8% to 2.5%;Mo: 0.15% to 0.4%;N: 0.0080% or less;O: 0.0020% or less; andthe balance being Fe and incidental impurities.2. The bearing steel according to claim 1 , wherein the chemical composition further contains claim 1 , by mass % claim 1 , at least one element selected from:Ti: 0.01% or less;Ni: 0.10% or less;Cu: 0.10% or less; andB: 0.0010% or less. The present invention relates to bearing steel capable of suppressing bearing damage ascribable to white structure resulting from hydrogen, which has been a problem in bearing steel made by general bearing steel (JIS-SUJ2) for use in, for example, automobiles, windmills, and industrial machines, and further, the alloy contents in the bearing steel are suppressed so as to impart workability equivalent to that of SUJ2, to thereby provide bearing steel being excellent both in post spheroidizing-annealing workability and in post quenching-tempering hydrogen fatigue resistance property.A bearing is required to have an excellent rolling contact fatigue life, and various studies have been hitherto made on the improvement of rolling contact fatigue life. An ...

Method for producing sintered ndfeb magnet

A method for producing a sintered NdFeB magnet having high coercivity and capable of being brought into applications without lowering its residual magnetic flux density or maximum energy product and without reprocessing. The method includes applying a substance containing dysprosium (Dy) and/or terbium (Tb) to the surface of the sintered NdFeB magnet forming a base body and then heating the magnet to diffuse Dy and/or Tb through the grain boundary and thereby increase the coercivity of the magnet. This method is characterized in that: (1) the substance containing Dy or Tb to be applied to the surface of the sintered NdFeB magnet is substantially a metal powder; (2) the metal powder is composed of a rare-earth element R and an iron-group transition element T, or composed of R, T and another element X, the element X capable of forming an alloy or intermetallic compound with R and/or T; and (3) the oxygen content of the sintered NdFeB magnet forming the base body is 5000 ppm or lower. The element T may contain nickel (Ni) or cobalt (Co) to produce an anticorrosion effect.

Steel strip composite and a method for making the same

A three-layer steel strip composite of a steel strip having a first microstructure disposed between two steel strips having a second microstructure wherein a metallic coating is present on each steel strip having the second microstructure on a surface opposite the surface contacting the steel strip having the first microstructure and method of making same.

STEEL SHEET AND A METHOD FOR ITS MANUFACTURE

A high-strength steel sheet has a chemical composition comprising C: 0.05-0.20%, Si: 0.02-3.0%, Mn: 0.5-3.0%, P: at most 0.5%, S: at most 0.05%, Cr: 0.05-1.0%, sol. Al: 0.01-1.0%, one or more elements selected from the group consisting of Ti, Nb, Mo, V, and W: a total of 0.002-0.03%, and a remainder of Fe and impurities. The sheet has an average grain diameter of ferrite of at most 3.0 μm at least in a region of 100-200 μm in the sheet thickness direction from the surface of the steel sheet. The average spacing in the sheet thickness direction of the remaining structure in this region is at most 3.0 μm. Mechanical properties include at least MPa tensile strength and at least MPa·% (tensile strength×elongation). 1. A steel sheet characterized by having the following chemical composition and metallographic structure:chemical composition: it comprises, in mass percent, C: 0.05-0.20%, Si: 0.02-3.0%, Mn: 0.5-3.0%, P: at most 0.5%, S: at most 0.05%, Cr: 0.05-1.0%, sol. Al: 0.01-1.0%, one or more elements selected from the group consisting of Ti, Nb, Mo, V, and W: a total of 0.002-0.03%, and a remainder of Fe and impurities;metallographic structure: the average grain diameter of ferrite is at most 3.0 μm at least in a region of from 100 μm to 200 μm in the sheet thickness direction from the surface of the steel sheet, this region consisting of 30-80% by area of ferrite and a remaining structure, and the average spacing in the sheet thickness direction and the average spacing in the rolling direction of the remaining structure in this region are at most 3.0 μm.2. A steel sheet as set forth in wherein the chemical composition contains one or more of Ca claim 1 , Mg claim 1 , and REM in a total amount of at most 0.0050%.3. A method of manufacturing a steel sheet by subjecting a steel billet having a chemical composition as set forth in to hot rolling with multiple passes followed by cooling and coiling claim 1 , characterized in that the hot rolling claim 1 , cooling claim 1 ...

HIGH STRENGTH STEEL SHEET HAVING EXCELLENT WARM STAMP FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

A high strength steel sheet excellent in warm stamp formability and a method for manufacturing the same. The steel has a composition containing, in terms of % by mass, C: 0.01 to 0.2%, Si: 0.5% or lower, Mn: 2% or lower, P: 0.03% or lower, S: 0.01% or lower, Al: 0.07% or lower, and N: 0.01% or lower and further containing one or two or more elements selected from Ti, Nb, V, Mo, W, and B. 1. A high strength steel sheet with excellent warm stamp formability comprising:a matrix, which is substantially a ferrite single phase in which an area ratio of the ferrite phase is 95% or more anda structure in which alloy carbides having a size of lower than 10 nm are dispersed and deposited in the matrix in a state having no variant selection,wherein the sheet has a tensile strength of 590 MPa or more and tensile properties in which strain from an indication of a maximum load to fracture is larger than the strain before the indication of the maximum load from a start of a tensile test carried out at a test temperature of 400° C. or higher and the strain before the indication of the maximum load from the start of tensile test is 40% or more in terms of ratio to a total elongation from the start of tensile test to fracture obtained in a tensile test carried out at a test temperature of lower than 400° C.2. The high strength steel sheet according to claim 1 , having a composition containing claim 1 , in terms of % by mass claim 1 , C: 0.01 to 0.2% claim 1 , Si: 0.5% or lower claim 1 , Mn: 2% or lower claim 1 , P: 0.03% or lower claim 1 , S: 0.01% or lower claim 1 , Al: 0.07% or lower claim 1 , N: 0.01% or lower claim 1 , and one or two or more elements selected from the group consisting of Ti: 0.005 to 0.3% claim 1 , Nb: 0.005 to 0.6% claim 1 , V: 0.005 to 1.0% claim 1 , Mo: 0.005 to 0.5% claim 1 , W: 0.01 to 1.0% claim 1 , and B: 0.0005 to 0.0040% and the balance Fe with inevitable impurities.3. The high strength steel sheet according to claim 1 , wherein the high strength steel ...

STAINLESS STEEL FOIL AND CATALYST CARRIER FOR EXHAUST GAS PURIFYING DEVICE USING THE FOIL

A stainless steel foil contains, in percent by mass, 0.05% or less of C, 2.0% or less of Si, 1.0% or less of Mn, 0.003% or less of S, 0.05% or less of P, 25.0% to 35.0% of Cr, 0.05% to 0.30% of Ni, 3.0% to 10.0% of Al, 0.10% or less of N, 0.02% or less of Ti, 0.02% or less of Nb, 0.02% or less of Ta, 0.005% to 0.20% of Zr, 0.02% or less of Ce, 0.03% to 0.20% of REM excluding Ce, 0.5% to 6.0% in total of at least one of Mo and W, and the balance being Fe and incidental impurities. 1. A stainless steel foil comprising: in percent by mass , 0.05% or less of C , 2.0% or less of Si , 1.0% or less of Mn , 0.003% or less of S , 0.05% or less of P , 25.0% to 35.0% of Cr , 0.05% to 0.30% of Ni , 3.0% to 10.0% of Al , 0.10% or less of N , 0.02% or less of Ti , 0.02% or less of Nb , 0.02% or less of Ta , 0.005% to 0.20% of Zr , 0.02% or less of Ce , 0.03% to 0.20% of REM excluding Ce , 0.5% to 6.0% in total of at least one of Mo and W , and the balance being Fe and incidental impurities.2. The stainless steel foil according to claim 1 , further comprising in percent by mass claim 1 , 2.5% to 5.0% in total of at least one of Mo and W.3. The stainless steel foil according to claim 1 , further comprising at least one of 0.01% to 0.20% (in percent by mass) of Hf claim 1 , 10 to 300 ppm of Ca claim 1 , and 15 to 300 ppm of Mg (in ppm by mass).4. The stainless steel foil according to claim 1 , further comprising claim 1 , in percent by mass claim 1 , 0.03% to 1.0% of Cu.5. The stainless steel foil according to claim 1 , wherein the foil thickness is 40 μm or more.6. A catalyst carrier for an exhaust gas purifying device comprising the stainless steel foil according to .7. The stainless steel foil according to claim 2 , further comprising at least one of 0.01% to 0.20% (in percent by mass) of Hf claim 2 , 10 to 300 ppm of Ca claim 2 , and 15 to 300 ppm of Mg (in ppm by mass).8. The stainless steel foil according to claim 2 , further comprising claim 2 , in percent by mass claim 2 , 0 ...

HIGH STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

A high strength hot-rolled steel sheet with a tensile strength of not less than 590 MPa which exhibits excellent bake hardenability and stretch-flangeability has a chemical composition including, in terms of mass %, C at 0.040 to 0.10%, Si at not more than 0.3%, Mn at 1.7 to 2.5%, P at not more than 0.030%, S at not more than 0.005%, Al at not more than 0.1% and N at 0.006 to 0.025%, and microstructure wherein a bainite phase represents not less than 60%, the total of a ferrite phase and a pearlite phase represents not more than 10%, and the bainite phase includes grains among which cementite grains have been precipitated at not less than 1.4×10grains/mmand the cementite grains have an average grain diameter of not more than 1.5 μm. 1. A high strength hot-rolled steel sheet with a tensile strength of not less than 590 MPa which has a chemical composition comprising , in terms of mass % , C at 0.040 to 0.10% , Si at not more than 0.3% , Mn at 1.7 to 2.5% , P at not more than 0.030% , S at not more than 0.005% , Al at not more than 0.1% and N at 0.006 to 0.025% , with the balance being represented by Fe and inevitable impurities , and has a microstructure in which a bainite phase represents not less than 60% , a total of a ferrite phase and a pearlite phase represents not more than 10% , and the bainite phase includes grains among which cementite grains have been precipitated at not less than 1.4×10grains/mmand the cementite grains have an average grain diameter of not more than 1.5 μm.2. The high strength hot-rolled steel sheet according to claim 1 , further comprising claim 1 , in terms of mass % claim 1 , one claim 1 , or two or more of Cr claim 1 , Mo and Ni at a total content of not more than 0.30%.3. The high strength hot-rolled steel sheet according to claim 1 , further comprising claim 1 , in terms of mass % claim 1 , one claim 1 , or two or more of Nb claim 1 , Ti and V at a total content of not more than 0.010%.4. The high strength hot-rolled steel sheet ...

HOT ROLLED THIN CAST STRIP PRODUCT AND METHOD FOR MAKING THE SAME

A hot rolled steel strip made by the steps including assembling a twin roll caster, forming a casting pool of molten steel of such composition that the cast strip produced comprises by weight, greater than 0.25% and up to 1.1% carbon, between 0.40 and 2.0% manganese, between 0.05 and 0.50% silicon, less than 0.01% aluminum, counter rotating the casting rolls to solidify metal shells and forming a steel strip, hot rolling the steel strip such that mechanical properties at 10% and 35% reduction are within 10% for yield strength, tensile strength and total elongation, and coiling the hot rolled steel strip at a temperature between 550 and 750° C. to provide a majority of the microstructure comprising pearlite, along with bainite and acicular ferrite. The steel may have a free oxygen content between 5 and 50 ppm or between 25 and 45 ppm. 1. A hot rolled steel strip made by the steps comprising:assembling an internally cooled roll caster having laterally positioned casting rolls forming a nip between them, and forming a casting pool of molten steel supported on the casting rolls above the nip and confined adjacent the ends of the casting rolls by side dams, the molten steel of such composition that hot rolled thin cast strip produced has a composition comprising by weight, greater than 0.25% and up to 1.1% carbon, between 0.5 and 2.0% manganese, between 0.05 and 0.50% silicon, less than 0.01% aluminum,counter rotating the casting rolls to solidify metal shells on the casting rolls as the casting rolls move through the casting pool, andforming from the metal shells downwardly through the nip between the casting rolls a steel strip,hot rolling the steel strip such that mechanical properties at 10% and 35% reduction are within 10% for yield strength, tensile strength and total elongation; andcoiling the hot rolled steel strip at a temperature between 550 and 750° C. to provide a majority of the microstructure comprising pearlite, along with bainite and acicular ferrite in ...

HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

A high-strength hot-rolled steel sheet having excellent formability has a composition containing, by mass, 0.04% to 0.1% of C, 0.3% to 1.3% of Si, 0.8% to 1.8% of Mn, 0.03% or less of P, 0.005% or less of S, 0.005% or less of N, 0.005% to 0.1% of Al, and at least one element selected from 0.002% to less than 0.03% of Ti, 0.002% to less than 0.03% of V, and 0.002% to less than 0.02% of Nb, the balance being Fe and incidental impurities. The steel sheet has a microstructure in which the area fraction of ferrite phase in the entire structure is 85% or more, the area fraction of bainite phase in the entire structure is 10% or less, the area fraction of phases other than the ferrite and bainite phases in the entire structure is 5% or less, and the area fraction of acicular ferrite phase in the entire ferrite phase is 30% to less than 80%. 1. A high-strength hot-rolled steel sheet having excellent formability , comprising a composition containing , by mass , 0.04% to 0.1% of C , 0.3% to 1.3% of Si , 0.8% to 1.8% of Mn , 0.03% or less of P , 0.005% or less of S , 0.005% or less of N , 0.005% to 0.1% of Al , and at least one element selected from 0.002% to less than 0.03% of Ti , 0.002% to less than 0.03% of V , and 0.002% to less than 0.02% of Nb , the balance being Fe and incidental impurities , the steel sheet having a microstructure in which an area fraction of a ferrite phase in the structure is 85% or more , an area fraction of a bainite phase in the structure is 10% or less , an area fraction of phases other than the ferrite and bainite phases in the structure is 5% or less , and an area fraction of an acicular ferrite phase in the ferrite phase is 30% to less than 80%.2. The steel sheet according to claim 1 , further comprising claim 1 , by mass claim 1 , at least one of 0.0005% to 0.005% of Ca and 0.0005% to 0.03% of REM.3. The steel sheet according to claim 1 , further comprising claim 1 , by mass claim 1 , 0.0002% to 0.005% of B.4. A method of manufacturing a ...