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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 28020. Отображено 100.
05-01-2012 дата публикации

Steel Alloy

Номер: US20120000336A1
Автор: Andreas Schremb
Принадлежит: Gebr Schmachtenberg GmbH

An alloy, such as a tool steel containing, in percent by weight, 0.5%-0.7% carbon; 1.80%-2.50% chromium; 0.90%-1.20% molybdenum; 3.50%-5.50% nickel and 0.60%-1.50% vanadium. The steel alloyed accordingly is eminently suitable for heat treatments for influencing strength. With a carbon content of less than 0.7%, a partially martensitic metal structure having a high ductility can be formed by way of hardening processes. Due to surface hardening, the carbon content may in some portions on the outer surface be greater than 0.7%.

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Номер записи: 1
05-01-2012 дата публикации

Method of Making Ultra-High Strength Stainless Steels

Номер: US20120000579A1
Автор: Warren M. Garrison, Jr.
Принадлежит: CARNEGIE MELLON UNIVERSITY

An ultra-high strength stainless steel alloy with enhanced toughness includes in % by weight: 0 to 0.06% carbon (C); 12.0 to 18% chromium (Cr); 16.5 to 31.0% cobalt (Co); 0 to 8% molybdenum (Mo); 0.5 to 5.0% nickel (Ni); 0 to 0.5% titanium (Ti); 0 to 1.0% niobium (Nb); 0 to 0.5% vanadium (V); 0 to 16% tungsten (W); balance iron (Fe) and incidental deoxidizers and impurities. The heat treating method includes the steps of austenitizing at least once followed by quenching, tempering and sub-zero cooling to obtain no more than about 6-8% retained austenite in the finished alloy.

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Номер записи: 2
20-05-2001 дата публикации

ТЕХНОЛОГИЧЕСКАЯ ЛИНИЯ УПРОЧНЕНИЯ МЕТАЛЛИЧЕСКИХ ИЗДЕЛИЙ

Номер: RU0000018070U1
Автор: Федоров Л.Е.
Принадлежит: Общество с ограниченной ответственностью "Пульсар"

1. Технологическая линия упрочнения металлических изделий, включающая взаимосвязанные между собой и смонтированные на общем основании узел нагрева поверхности металлического изделия с ванной расплава, узел введения легирующих элементов и источник энергии, отличающаяся тем, что технологическая линия снабжена расположенным в ванне расплава приспособлением молекулярного синтеза и формирования ядер кристаллизации нитридных или карбидных структур и смонтированным под ванной расплава узлом высокоградиентного отвода тепла, а узел нагрева выполнен в виде высокоэнергетического квантового генератора электромагнитных излучений. 2. Линия по п.1, отличающаяся тем, что приспособление молекулярного синтеза и формирования ядер кристаллизации нитридных или карбамидных структур выполнено в виде смесителя расплавленных легирующих элементов и расплава металлического изделия, расположенного в объеме ванны расплава. 3. Линия по п.1, отличающаяся тем, что приспособление молекулярного синтеза и формирования ядер кристаллизации нитридных или карбамидных структур выполнено с элементами термокапиллярной конвенции - квазитвердого раствора ультрадисперсных частиц для упрочнения металлических элементов. 4. Линия по п.1, отличающаяся тем, что смеситель приспособления молекулярного синтеза выполнен в виде высокоградиентных встречных конвективных потоков расплавов легирующих элементов и расплава металлического изделия. 5. Линия по п.1, отличающаяся тем, что металлическое изделие выполнено в виде элемента марганцовистой стали, а легирующий элемент выполнен в виде нитрида бора. 6. Линия по п.1, отличающаяся тем, что металлическое изделие выполнено в виде элемента марганцовистой стали, а легирующий элемент выполнен из карбида тантала. 7. Линия по п.1, отличающаяся тем, что металлическое изделие выполнено в виде элемента из титана, а легирующий элемент выполнен из карбида кремния. 8. Линия по п.1, отличающаяся тем, что металлическое изделие выполнено в виде элемента из титана, а легирующий элемент ...

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Номер записи: 3
20-10-2001 дата публикации

ТЕХНОЛОГИЧЕСКАЯ ЛИНИЯ УПРОЧНЕНИЯ МЕТАЛЛИЧЕСКИХ ИЗДЕЛИЙ

Номер: RU0000020100U1
Автор: Федоров Л.Е.
Принадлежит: Федоров Леонид Ефимович

1. Технологическая линия упрочнения металлических изделий, включающая взаимосвязанные между собой узел нагрева поверхности металлического изделия с ванной расплава, узел введения легирующих элементов и источник энергии, отличающаяся тем, что технологическая линия снабжена расположенным в ванне расплава приспособлением молекулярного синтеза и формирования ядер кристаллизации нитридных и/или карбидных структур и смонтированным над ванной расплава узлом высокоградиентного отвода тепла, а узел нагрева поверхности металлического изделия выполнен в виде высокоэнергетического квантового генератора оптических тепловых излучений. 2. Линия по п.1, отличающаяся тем, что приспособление молекулярного синтеза и формирования ядер кристаллизации нитридных и/или карбидных структур выполнено в виде смесителя расплавленных легирующих элементов и расплава металлического изделия, расположенного в объеме ванны расплава. 3. Линия по п.1, отличающаяся тем, что приспособление молекулярного синтеза и формирования ядер кристаллизации нитридных и/или карбидных структур выполнено с элементами термокапиллярной конвенции и образования квазитвердого раствора ультрадисперсных частиц для упрочнения металлических элементов. 4. Линия по п.1, отличающаяся тем, что смеситель приспособления молекулярного синтеза и формирования ядер кристаллизации нитридных и/или карбидных структур выполнен в виде высокоградиентных встречных конвективных потоков расплавов легирующих элементов и расплава металлического изделия. 5. Линия по п.1, отличающаяся тем, что металлическое изделие выполнено в виде элемента марганцовистой стали, а легирующий элемент - из группы нитрида бора. 6. Линия по п.1, отличающаяся тем, что металлическое изделие выполнено в виде элемента марганцовистой стали, а легирующий элемент - выполнен из карбида танталла. 7. Линия по п.1, отличающаяся тем, что металлическое изделие выполнено в виде элемента титана, а легирующий элемент выполнен из карбида кремния. 8. Линия по п.1, отличающаяся тем, что ...

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Номер записи: 4
27-05-2012 дата публикации

УСТРОЙСТВО ЭЛЕКТРОКОНТАКТНОЙ ТЕРМИЧЕСКОЙ ОБРАБОТКИ ДЕТАЛЕЙ ИЗ СТАЛИ

Номер: RU0000116497U1
Автор: Бахматов Павел Вячеславович, Краснощёков Денис Олегович, Муравьёв Василий Илларионович, Фролов Алексей Валерьевич
Принадлежит: Государственное образовательное учреждение высшего профессионального образования "Комсомольский-на-Амуре государственный технический университет" (ГОУВПО "КнАГТУ")

Устройство для электроконтактной термической обработки деталей из стали, включающее аппарат для сварки деталей из стали, отличающееся тем, что для управления режимом термической обработки оно снабжено пропорционально-интегрально-дифференциальным (ПИД) регулятором, подключенным к аппарату для сварки деталей из стали, и управляемым им симисторным регулятором мощности. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 116 497 U1 (51) МПК C21D 1/40 (2006.01) C21D 6/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ 2011130482/02, 21.07.2011 (24) Дата начала отсчета срока действия патента: 21.07.2011 (45) Опубликовано: 27.05.2012 Бюл. № 15 R U 1 1 6 4 9 7 Формула полезной модели Устройство для электроконтактной термической обработки деталей из стали, включающее аппарат для сварки деталей из стали, отличающееся тем, что для управления режимом термической обработки оно снабжено пропорциональноинтегрально-дифференциальным (ПИД) регулятором, подключенным к аппарату для сварки деталей из стали, и управляемым им симисторным регулятором мощности. Стр.: 1 U 1 U 1 (54) УСТРОЙСТВО ЭЛЕКТРОКОНТАКТНОЙ ТЕРМИЧЕСКОЙ ОБРАБОТКИ ДЕТАЛЕЙ ИЗ СТАЛИ 1 1 6 4 9 7 Адрес для переписки: 681013, Хабаровский край, г. Комсомольск-наАмуре, пр. Ленина, 27, ГОУВПО "КнАГТУ", патентный отдел (73) Патентообладатель(и): Государственное образовательное учреждение высшего профессионального образования "Комсомольский-на-Амуре государственный технический университет" (ГОУВПО "КнАГТУ") (RU) R U Приоритет(ы): (22) Дата подачи заявки: 21.07.2011 (72) Автор(ы): Муравьёв Василий Илларионович (RU), Фролов Алексей Валерьевич (RU), Бахматов Павел Вячеславович (RU), Краснощёков Денис Олегович (RU) U 1 U 1 1 1 6 4 9 7 1 1 6 4 9 7 R U R U Стр.: 2 RU 5 10 15 20 25 30 35 40 45 116 497 U1 Полезная модель относится к машиностроению, преимущественно к термической обработке металлов, и может использоваться при нормализации, отжиге и отпуске сталей. Известно устройство ...

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Номер записи: 5
26-01-2012 дата публикации

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

Номер: US20120018028A1
Автор: Junji Shimamura, Mitsuhiro Okatsu, Nobuo Shikanai, Nobuyuki Ishikawa
Принадлежит: JFE Steel Corp

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.

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Номер записи: 6
26-01-2012 дата публикации

Method and apparatus for heating sheet material

Номер: US20120021916A1
Автор: Carsten Buehrer, Christoph Fuelbier, Jens Krause
Принадлежит: ZENERGY POWER GMBH

A method and an apparatus for heating a sheet material made of an electrically conductive, non-magnetic material, the apparatus including at least one coil arrangement with DC-carrying windings that is made to rotate around an axis oriented perpendicular to the sheet material and to thereby induce eddy currents in the sheet material.

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Номер записи: 7
03-05-2012 дата публикации

HIGH Cr FERRITIC/MARTENSITIC STEELS HAVING AN IMPROVED CREEP RESISTANCE FOR IN-CORE COMPONENT MATERIALS IN NUCLEAR REACTOR, AND PREPARATION METHOD THEREOF

Номер: US20120106693A1
Автор: Chan Bock Lee, Chang Hee Han, Dohee Hahn, Jong Hyuk Baek, Jun Hwan Kim, Sung Ho Kim, Tae Kyu Kim, Woo Gon Kim, Yeong-II Kim
Принадлежит: Korea Atomic Energy Research Institute KAERI, Korea Hydro and Nuclear Power Co Ltd

Disclosed herein is a high Cr Ferritic/Martensitic steel comprising 0.04 to 0.13% by weight of carbon, 0.03 to 0.07% by weight of silicon, 0.40 to 0.50% by weight of manganese, 0.40 to 0.50% by weight of nickel, 8.5 to 9.5% by weight of chromium, 0.45 to 0.55% by weight of molybdenum, 0.10 to 0.25% by weight of vanadium, 0.02 to 0.10% by weight of tantalum, 0.21 to 0.25% by weight of niobium, 1.5 to 3.0% by weight of tungsten, 0.015 to 0.025% by weight of nitrogen, 0.01 to 0.02% by weight of boron and iron balance. By regulating the contents of alloying elements such as nitrogen, born, the high Cr Ferritic/Martensitic steel with to superior tensile strength and creep resistance is provided, and can be effectively used as an in-core component material for sodium-cooled fast reactor (SFR).

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Номер записи: 8
31-05-2012 дата публикации

Method for producing martensitic steel with mixed hardening

Номер: US20120132326A1
Автор: Laurent Ferrer, Philippe Heritier
Принадлежит: Aubert and Duval SA, SNECMA SAS

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.

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Номер записи: 9
12-07-2012 дата публикации

Bearing steels

Номер: US20120177527A1
Автор: Aidan Michael Kerrigan, Henrik Karlsson, Mohamed Sherif
Принадлежит: SKF AB

There is provided a novel bearing steel composition and a method of forming a bearing. The bearing steel composition comprises: Carbon 0.4 to 0.8 wt %; Nitrogen 0.1 to 0.2 wt %; Chromium 12 to 18 wt %; Molybdenum 0.7 to 1.3 wt %; Silicon 0.3 to 1 wt %; Manganese 0.2 to 0.8 wt %; and Iron 78 to 86.3 wt %.

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Номер записи: 10
26-07-2012 дата публикации

Nonmagnetic stainless steel, member for radio-controlled timepiece, production process of nonmagnetic stainless steel and radio wave receiver

Номер: US20120190321A1
Автор: Junichi Sato, Kenji Yokoyama, Toshihiro Uehara
Принадлежит: Casio Computer Co Ltd, Hitachi Metals Ltd

A nonmagnetic stainless steel which has a higher electrical resistivity than existing nonmagnetic alloys, a production process for producing the stainless steel, and a radio wave receiver. The receiver has a main case and rear cover constituted of a nonmagnetic stainless steel having an electrical resistivity as high as more than 100 μΩ·cm and consisting of C: not more than 0.1%, Si: 4.0-7.5%, Mn: not more than 2.0%, Ni: 25.5-30.0%, Cr: 15.0-20.0%, Mo: 0.1-3.0%, Cu: 0-2.0%, in mass % and the balance Fe and impurities. Even if some variable magnetic flux generated by a coil of an antenna runs through the main case and the rear cover, the receiving efficiency of the antenna can be prevented from being reduced by eddy current loss and a sufficient radio receiving sensitivity can be obtained. This nonmagnetic stainless steel is produced by hot and/or cold plastic working and subsequent solution treating conducted at 1,000-1,180° C.

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Номер записи: 11
18-10-2012 дата публикации

Hot-rolled steel car or wire rod

Номер: US20120263622A1
Автор: Akira Kito, Takayuki Nakamura, Yoshihiro Daitoh
Принадлежит: Sumitomo Metal Industries Ltd

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.

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Номер записи: 12
01-11-2012 дата публикации

Method for manufacturing a hot press-hardened component, use of a steel product for manufacturing a hot press-hardened component and hot press-hardened component

Номер: US20120273092A1
Автор: Evelin Ratte
Принадлежит: THYSSENKRUPP NIROSTA GMBH

A method of manufacturing a hot press-hardened component comprises the following production steps: a) providing a steel product produced at least in sections from a stainless steel comprising of the following composition (specified in % wt.) C: 0.010-1.200%, P: up to 0.1%, S: up to 0.1%, Si: 0.10-1.5%, Cr: 10.5-20.0% and optionally one or more elements from the group “Mn, Mo, Ni, Cu, N, Ti, Nb, B, V, Al, Ca, As, Sn, Sb, Pb, Bi, H” with the requirement Mn: 0.10-3.0%, Mo: 0.05-2.50%, Ni: 0.05-8.50%, Cu: 0.050-3.00%, N: 0.01-0.2%, Ti: up to 0.02%, Nb: up to 0.1%, B: up to 0.1%, V: up to 0.2%, Al: 0.001-1.50%, Ca: 0.0005-0.003%, As: 0.003-0.015%, Sn: 0.003-0.01%, Sb: 0.002-0.01%, Pb: up to 0.01%, Bi: up to 0.01%, H: up to 0.0025%, remainder iron and unavoidable impurities; b) heating the steel product to an austenisation temperature above the Ac3 temperature of the stainless steel; c) hot press-hardening the heated steel product in a pressing die to form the component; and d) cooling at least one section of the component at a cooling rate that is high enough for a martensitic structure to form in each section that is rapidly cooled.

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Номер записи: 13
08-11-2012 дата публикации

Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor

Номер: US20120279607A1
Автор: Katsuki Tanaka, Masahiro Seto, Mitsuru Yoshizawa, Yoshitaka Nishiyama
Принадлежит: Sumitomo Metal Industries Ltd

There is provided an austenitic stainless steel pipe excellent in steam oxidation resistance. The austenitic stainless steel pipe excellent in steam oxidation resistance contains, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, and is configured so that a region satisfying the following Formula exists in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe: (α/β)×δ/ε×100≧0.3 where the meanings of symbols in the above Formula are as follows: α: sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degrees β: the number of total pixels of digital image in region of measurement using electron backscattering pattern ε: analysis pitch width of electron backscattering pattern (μm) δ: grain boundary width (μm).

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Номер записи: 14
22-11-2012 дата публикации

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

Номер: US20120291927A1
Автор: Masayuki Hashimura, Tetsushi Chida
Принадлежит: Nippon Steel Corp

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.

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Номер записи: 15
29-11-2012 дата публикации

Method for manufacturing grain oriented electrical steel sheets

Номер: US20120298265A1
Автор: Kenichi Sadahiro
Принадлежит: JFE Steel Corp

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.

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Номер записи: 16
13-12-2012 дата публикации

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

Номер: US20120312425A1
Автор: Manabu Kubota, Tatsuya Koyama
Принадлежит: Individual

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)

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Номер записи: 17
03-01-2013 дата публикации

Manufacturing method of grain-oriented electrical steel sheet

Номер: US20130000786A1
Автор: Chie Hama, Kazumi Mizukami, Kenichi Murakami, Shuichi Nakamura, Yoshiyuki Ushigami
Принадлежит: Individual

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.

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Номер записи: 18
03-01-2013 дата публикации

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

Номер: US20130004360A1
Автор: Junichi Hamada, Norihiro Kanno, Yoshiharu Inoue
Принадлежит: Individual

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.

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Номер записи: 19
03-01-2013 дата публикации

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

Номер: US20130004361A1
Автор: Nobuhiko Hiraide, Shinichi Teraoka, Shunji Sakamoto
Принадлежит: Individual

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.

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Номер записи: 20
03-01-2013 дата публикации

High-nitrogen stainless steel pipe with high strength, high ductility, and excellent corrosion and heat resistance and process for producing same

Номер: US20130004883A1
Автор: Harumatu Miura, Kazuo Oda
Принадлежит: ODA INDUSTRIES Co Ltd

Provided is a novel high-nitrogen stainless-steel pipe which is not obtained with any conventional technique, the stainless-steel pipe having high strength, high ductility, and excellent corrosion and heat resistance and being obtained through size reduction of crystal grains and strengthening by slight plastic working besides formation of a gradient structure in which the concentration of solid-solution nitrogen continuously decreases gradually from the surface. Also provided are hollow materials of various shapes and sizes which are formed from the steel pipe and processes for producing the steel pipe and the hollow materials. An austenitic stainless-steel pipe is treated in a range of the temperatures not higher than the critical temperature for crystal grain enlargement of the steel pipe material to cause nitrogen (N) to be absorbed into the surface of the pipe and diffused into the solid phase, while minimizing the enlargement of crystal grains during the treatment. Thus, a gradient structure is formed, the structure including a part that is close to the surface part of the pipe and has been highly strengthened by the formation of a high-concentration solid solution of N and a part in which ductility gradually increases toward around the center of the cross-section of the pipe as the N concentration decreases. Thereafter, the pipe is subjected to size reduction of crystal grains by utilizing, for example, eutectoid transformation of the austenite phase, thereby greatly improving the elongation (ductility) of the steel pipe. Furthermore, the steel pipe is strengthened by slight plastic working to give a high-nitrogen austenitic stainless-steel pipe having high strength, high ductility, and excellent corrosion and heat resistance. A plurality of the thus-obtained high-nitrogen austenitic stainless steel pipes of the same quality are disposed one over another so as to result in dimensions, e.g., diameter and wall thickness, according to the use or strength level, ...

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Номер записи: 21
10-01-2013 дата публикации

High-strength steel sheet and method for producing same

Номер: US20130008568A1
Автор: Daisuke Maeda, Genichi Shigesato, Kenichi Yamamoto, Naoki Yoshinaga, Satoshi Hirose, Yoshihiro SUWA
Принадлежит: Nippon Steel Corp

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.

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Номер записи: 22
07-03-2013 дата публикации

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

Номер: US20130056115A1
Автор: Hideyuki Nakamura, Isao Anai, Takaaki Fukushi
Принадлежит: Individual

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.

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Номер записи: 23
11-04-2013 дата публикации

High strength steel sheet and method for manufacturing the same

Номер: US20130087253A1
Автор: Hiroshi Matsuda, Yasushi Tanaka, Yoshimasa Funakawa
Принадлежит: JFE Steel Corp

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.

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Номер записи: 24
18-04-2013 дата публикации

Martensitic antibacterial stainless steel and manufacturing method thereof

Номер: US20130092296A1
Автор: Dexin Qui
Принадлежит: Individual

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.

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Номер записи: 25
16-05-2013 дата публикации

Heat transfer tube for steam generator and method for producing the same

Номер: US20130118420A1
Автор: Kouichi Kuroda, Masatoshi Toyoda
Принадлежит: Nippon Steel and Sumitomo Metal Corp

In a heat transfer tube for a steam generator, a surface roughness of an inner surface of the tube is measured along a longitudinal direction and an amount of dimensional variation in a length of 50 mm taken from a measured roughness chart is 4 μm or less and an amount of bend crookedness in a portion of a length of 1000 mm from a tube end is 1 mm or less. Hence, when the tube is produced, an inspection of the tube by an eddy current flaw detection can be conducted at a high S/N ratio and hence an inspection efficiency can be improved, and when the tube is assembled into a heat exchanger, the assembling operation can be easily performed.

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Номер записи: 26
23-05-2013 дата публикации

Manufacturing method of non-oriented electrical steel sheet

Номер: US20130125601A1
Автор: Masahiro Fujikura, Takeshi Kubota
Принадлежит: Nippon Steel and Sumitomo Metal Corp

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%.

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Номер записи: 27
23-05-2013 дата публикации

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

Номер: US20130126052A1
Автор: Hiroki Ota, Kenichi Fujita, Yasushi Kato
Принадлежит: JFE Steel Corp

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.

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Номер записи: 28
23-05-2013 дата публикации

Ferritic stainless steel

Номер: US20130129560A1
Автор: Michio Nakata, Tooru Matsuhashi
Принадлежит: Individual

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.

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Номер записи: 29
23-05-2013 дата публикации

Grain oriented electrical steel sheet and method for manufacturing the same

Номер: US20130130043A1
Автор: Hiroi Yamaguchi, Seiji Okabe, Takeshi Omura
Принадлежит: JFE Steel Corp

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.

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Номер записи: 30
30-05-2013 дата публикации

METHOD FOR MANUFACTURING HIGH STRENGTH STEEL SHEET

Номер: US20130133786A1
Автор: Funakawa Yoshimasa, Matsuda Hiroshi, Tanaka Yasushi
Принадлежит: JFE STEEL CORPORATION

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

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Номер записи: 31
30-05-2013 дата публикации

Complex metallographic structured high strength steel and method of manufacturing

Номер: US20130136950A1
Автор: Weiping Sun
Принадлежит: Nucor Corp

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%.

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Номер записи: 32
06-06-2013 дата публикации

Heat transfer element for manifold

Номер: US20130139493A1
Автор: Kazunari Imakawa, Manabu Oku, Sadayuki Nakamura, Yoshihiro Oka
Принадлежит: Nisshin Steel Co Ltd

A heat transfer element for manifold prevents thermal fatigue of a manifold main body and has good high-temperature strength and oxidation resistance. At least one part of the heat transfer element for manifold is formed from ferritic stainless steel. The ferritic stainless steel contains at least one element, in terms of mass %, of: C: 0.03% or less; Si: 2.0% or less; Mn: 2.0% or less; Cr: 10 to 30%; Nb: 0.8% or less; and Ti: 0.8% or less, and N: 0.03% or less, and the remaining part thereof is formed from Fe and inevitable impurities. _Further, an alloy content of the ferritic stainless steel is adjusted so that an A value in equation (1), where A value=Nb+Ti−4(C+N), is 0.10 or more, and a B value in equation (2), where B value=Cr+15Si, is 18 or more.

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Номер записи: 33
13-06-2013 дата публикации

High-Carbon Iron-Based Amorphous Alloy Using Molten Pig Iron and Method of Manufacturing the Same

Номер: US20130146185A1
Автор: Eon-Byeong Park, Gab-Sik Byun, Oh-Joon Kwon, Sang-Hoon Yoon, Sang-Won Kim, Sang-Wook Ha, Seong Hoon Yi, Seung-Dueg Choi, Young-Geun Son
Принадлежит: Posco Co Ltd

Provided is an iron-based amorphous alloy and a method of manufacturing the same. More particularly, provided is an high carbon iron-based amorphous alloy expressed by a general formula FeαCβSiγBxPyCrz, wherein α, β, γ, x, y and z are atomic % of iron (Fe), carbon (C), silicon (Si), boron (B), phosphorus (P), and chrome (Cr) respectively, wherein a is expressed by α= 100 −(β+γ+x+y+z) atomic %, β is expressed by 13.5 atomic %≦β≦17.8 atomic %, γ is expressed by 0.30 atomic %≦γ≦1.50 atomic %, x is expressed by 0.1 atomic %≦x≦4.0 atomic %, y is expressed by 0.8 atomic %≦y≦7.7 atomic %, and z is expressed by 0.1 atomic %≦z≦3.0 atomic %.

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Номер записи: 34
20-06-2013 дата публикации

METHOD FOR THERMAL TREATMENT OF ARTICLES FROM IRON-BASED ALLOYS (VARIANTS)

Номер: US20130153090A1
Автор: DEGTYAREV Vasily Nikolaevich, GORNOSTYREV Yury Nikolaevich, KATSNELSON Mikhail Iosifovich, KHABIBULIN Dim Maratovich, KORNILOV Vladimir Leonidovich, KOROLEV Alexandr Vasilievich, MOKSHIN Evgeny Dmitrievich, MURIKOV Sergey Anatolievich, PLATOV Sergey Iosifovich, SAMOKHVALOV Gennady Vasilievich, SHMAKOV Anton Vladimirovich, URTSEV Nikolay Vladimirovich, URTSEV Vladimir Nikolaevich, VORONIN Vladimir Ivanovich
Принадлежит: Obschestvo S Ogranichennoi Otvetstvennostyu "Issle dovatelsko-Tekhnologichesky Tsentr "AUSFERR"

The invention relates to the field of thermal processing of articles consisting of steel and iron-based alloys with a carbon content of up to 4.3% by weight. In order to reduce the duration of the technological processes used for producing articles consisting of iron-based alloys with a set structural state, the first variant of the method comprises heating the articles so as to form austenite and then cooling, which is performed under conditions which ensure the formation, in the structure of the alloy, of regions of austenite with a chemical composition similar to eutectoid with the subsequent formation in said regions of marinite and a set structural state so as to produce perlite with a different degree of dispersion and/or hardened structures. The second variant of the method comprises heating the article, which is performed under conditions which ensure the formation, in the structure of the alloy, of marinite and then cooling with the formation a set structural state so as to produce perlite with a different degree of dispersion and/or hardened structures. When implementing the methods, pulsed cooling and plastic deformation are used. 1. A method for the heat treatment of articles made of iron-based alloys having carbon contents of up to 4.3% by weight , comprising: heating to provide the formation of austenite and subsequent cooling according to schedules that provide the formation of the desired structural state , wherein cooling is carried out according to schedules that provide the occurrence of austenite regions having near-eutectoid chemical compositions , followed by forming marinite therein , and wherein the desired structural state is formed so as to obtain therein pearlite in various degrees of dispersion and/or quenched structures.2. The method according to claim 1 , wherein cooling is carried out according to schedules that provide the formation of the desired fraction of austenite regions having near-eutectoid chemical compositions claim 1 , ...

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Номер записи: 35
27-06-2013 дата публикации

Method for producing a tempered martensitic heat resistant steel for high temperature application

Номер: US20130160905A1
Автор: Cheng Liu, Peter Francis Morris, Philip Clarke, Urszula Alicja Sachadel
Принадлежит: TATA STEEL NEDERLAND TECHNOLOGY BV

A method for producing a tempered martensitic heat resistant steel for high temperature applications at an application temperature of up to 650° C. and to a steel produced by the method. The use of the steel in the production of components for high temperature applications such as turbine blades or casings, bolting and boiler tubes, heat exchangers or other elements in power generation systems.

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Номер записи: 36
04-07-2013 дата публикации

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

Номер: US20130167985A1
Автор: Hayato Saito, Katsumi Nakajima, Noriaki Moriyasu, Takayuki Murata, Yoshimasa Funakawa
Принадлежит: JFE Steel Corp

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.

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Номер записи: 37
18-07-2013 дата публикации

MARTENSITIC STAINLESS STEEL MACHINEABILITY OPTIMIZATION

Номер: US20130180628A1
Автор: Chabot Jean-François Laurent, Ferrer Laurent, Thoison Pascal Charles Emile
Принадлежит: SNECMA

A method of fabricating a martensitic stainless steel including: 1) heating steel to a temperature higher than austenizing temperature of the steel, then quenching the steel until a hottest portion of the steel is at a temperature less than or equal to a maximum temperature, and greater than or equal to a minimum temperature, a cooling rate being sufficiently fast for austenite not to transform into a ferrito-perlitic structure; 2) performing a first anneal followed by cooling until the hottest portion of the steel is at a temperature less than or equal to the maximum temperature and greater than or equal to the minimum temperature; 3) performing a second anneal followed by cooling to ambient temperature; and at the end of each of 1) and 2), performing: ω) as soon as temperature of the hottest portion of the steel reaches the maximum temperature, immediately heating the steel once more. 110-. (canceled)11. A method of fabricating a martensitic stainless steel comprising:1) heating steel to a temperature higher than austenizing temperature of the steel, then quenching the steel until a hottest portion of the steel is at a temperature less than or equal to a maximum temperature, and greater than or equal to a minimum temperature, a rate of cooling being sufficiently fast for austenite not to transform into a ferrito-perlitic structure;2) performing a first anneal on the steel followed by cooling until the hottest portion of the steel is at a temperature less than or equal to the maximum temperature and greater than or equal to the minimum temperature; and3) performing a second anneal of the steel followed by cooling to ambient temperature;wherein the maximum temperature is less than or equal to the temperature for an end of martensitic transformation on cooling in inter-dendritic spaces in the steel, and, at an end of each of 1) and 2), performing:ω) as soon as temperature of the hottest portion of the steel reaches the maximum temperature, immediately heating the ...

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Номер записи: 38
25-07-2013 дата публикации

Steel strip composite and a method for making the same

Номер: US20130189539A1
Автор: Christiaan Theodorus Wilhelmus Lahaye, Jörgen VAN DE LANGKRUIS
Принадлежит: TATA STEEL IJMUIDEN BV

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.

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Номер записи: 39
01-08-2013 дата публикации

METAL-BASE ALLOY PRODUCT AND METHODS FOR PRODUCING THE SAME

Номер: US20130195709A1
Автор: Fredriksson Hasse, Makaya Advenit, Ranganathan Sathees, Solaimanzadeh-Azar Sohrab
Принадлежит: SUPERIOR METALS SWEDEN AB

A metal base alloy and methods for producing the alloy. The metal base alloy product includes the formula MeTSiCrMnj VCf, wherein—Meis a metal base selected from the group having Fe, Co and Ni, in an amount ranging from about 45-75 w %. The metal base alloy product contains a substantially homogenous dispersion of separate precipitated carbide particles in an amount ranging from 10-65 percentages by volume and the precipitate carbide particles have an average diameter of 0.01-5 micrometers. 2. Metal base alloy product according to wherein said precipitated carbide particles are substantially spherical carbides having an average diameter of 0.1-5 micrometer.3. Metal base alloy according to claim 1 , wherein said precipitated carbide particles are a mixture of substantially spherical carbides having an average diameter of 0.5-5 micrometer and of nano-crystalline carbides having an average size of 0.01-0.5 micrometer.4. Metal base alloy according to claim 1 , wherein said precipitated carbide particles are surrounded by a matrix of ferrite and/or austenite.5. Metal base alloy according to claim 1 , wherein said alloy has a tensile strength of at least about 800 MPa.6. A metal base alloy according to claim 1 , wherein the Meis Fe present in an amount from about 45-75 w %.7. A metal base alloy according to claim 1 , wherein the Tis Mo present in an amount from about 5-10 w %.8. A method to produce a metal base alloy product consisting of the formula MeTSiCrMnVC claim 1 , wherein{'sub': 'base', 'Meis a metal base selected from the group consisting of Fe, Co and NI, in an amount ranging from about 45-75 w %,'}{'sub': 'a', 'Tis an alloying material selected from the group consisting of Mo, Nb and Ta in an amount a ranging from about 5-10 w %,'}{'sub': 'b', 'Siis a further alloying member in an amount b ranging from about 4-10 w %,'}{'sub': 'c', 'Cris a further alloying member in an amount c ranging from about 8-30 w %,'}{'sub': 'd', 'Mnis a further alloying member in an ...

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Номер записи: 40
15-08-2013 дата публикации

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

Номер: US20130206288A1
Автор: HASEGAWA Hiroshi, Kaneko Shinjiro, Nagataki Yasunobu, Nakagaito Tatsuya
Принадлежит: JFE STEEL CORPORATION

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

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Номер записи: 41
22-08-2013 дата публикации

Method for producing alloy

Номер: US20130213531A1
Автор: Jun Tamai, Toshiya Inoue
Принадлежит: Canon Inc

To provide an alloy which can suppress minute temporal deformation of a Super Invar alloy as much as possible, and a method for producing the alloy. The alloy of the present invention includes iron, nickel, and cobalt, which are the basic components of a Super Invar alloy, and is characterized in that an amount of a fraction which has not carbidized in carbon contained in the alloy is 0.010 wt % or less.

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Номер записи: 42
12-09-2013 дата публикации

New Classes of Non-Stainless Steels with High Strength and High Ductility

Номер: US20130233452A1
Автор: BALL Andrew T., BRANAGAN Daniel James, Cheng Sheng, JUSTICE Grant G., MEACHAM Brian E., NATION Brendan L., SERGUEEVA Alla V., WALLESER Jason K.
Принадлежит: THE NANOSTEEL COMPANY, INC.

The present disclosure is directed and formulations and methods to provide non-stainless steel alloys having relative high strength and ductility. The alloys may be provided in sheet or pressed form and characterized by their particular alloy chemistries and identifiable crystalline grain size morphology. The alloys are such that they include boride pinning phases. In what is termed a Class 1 Steel the alloys indicate tensile strengths of 630 MPa to 1100 MPa and elongations of 10-40%. Class 2 Steel indicates tensile strengths of 875 MPa to 1590 MPa and elongations of 5-30%. Class 3 Steel indicates tensile strengths of 1000 MPa to 1750 MPa and elongations of 0.5-15%. 111-. (canceled)12. A method comprising:(a) supplying a metal alloy comprising Fe at a level of 65.5 to 80.9 atomic percent, Ni at 1.7 to 15.1 atomic percent, B at 3.5 to 5.9 atomic percent, Si at 4.4 to 8.6 atomic percent;(b) melting said alloy and solidifying to provide a crystalline and non-glassy morphology having dendritic morphology and a matrix grain size of 500 nm to 20,000 nm and a boride grain size of 100 nm to 2500 nm; and 'wherein said alloy formed in (a) or (b) is in the form of sheet at a thickness of 0.3 mm to 150 mm and width of at least 100 mm.', '(c) heating said alloy and forming lath structure including grains of 100 nm to 10,000 nm and boride grain size of 100 nm to 2500 nm and said alloy has a yield strength of 300 MPa to 1400 MPa, tensile strength of 350 MPa to 1600 MPa and elongation of 0-12%'}13. The method of wherein said alloy includes one or more of the following:Cr at 0 to 8.8 atomic percentCu at 0 to 2.0 atomic percentMn at 0 to 18.8 atomic percent.14. The method of wherein said melting is achieved at temperatures in the range of 1100° C. to 2000° C. and solidification is achieved by cooling in the range of 11×10to 4×10K/s.15. The method of including heating the alloy after step (c) and forming lamellae grains 100 nm to 10 claim 12 ,000 nm thick claim 12 , 0.1-5.0 microns in ...

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Номер записи: 43
12-09-2013 дата публикации

High hardness, high toughness iron-base alloys and methods for making same

Номер: US20130233454A1
Автор: Glenn J. Swiatek, Ronald E. Bailey, Thomas R. Parayil
Принадлежит: ATI Properties LLC

An aspect of the present disclosure is directed to low-alloy steels exhibiting high hardness and an advantageous level of multi-hit ballistic resistance with low or no crack propagation imparting a level of ballistic performance suitable for military armor applications. Various embodiments of the steels according to the present disclosure have hardness in excess of 550 BHN and demonstrate a high level of ballistic penetration resistance relative to conventional military specifications.

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Номер записи: 44
12-09-2013 дата публикации

High strength hot dip galvannealed steel sheet of excellent phosphatability and ductility, and a production process therefor

Номер: US20130236740A1
Автор: Hiroshi Irie, Takeshi Kojima
Принадлежит: Kobe Steel Ltd

For obtaining a hot dip galvannealed steel sheet having high strength and high ductility and excellent phosphatability, a chemical composition of a material steel sheet for forming the hot dip galvannealed steel sheet comprises 0.4 to 2.0 mass % of Si and 1.0 to 3.5 mass % of Mn, and an average Mn concentration for a region from the uppermost surface to 0.01 μm depth in the coating layer is defined as 0.14% or more.

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Номер записи: 45
26-09-2013 дата публикации

Method for forming patterns on substrates and articles manufactured by the same

Номер: US20130248057A1
Автор: Po-Feng Ho, Quan Zhou, Xin-Wu Guan
Принадлежит: Fih Hong Kong Ltd, Shenzhen Futaihong Precision Industry Co Ltd

A method for forming pattern on substrate comprises steps of: providing a metal substrate; amorphousizing the metal substrate to from an amorphous pattern layer in the metal substrate; etching the metal substrate and forming an etching portion in the surface of the metal substrate which is not covered with the amorphous pattern layer. The article manufactured by the method is also provided.

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Номер записи: 46
03-10-2013 дата публикации

Steel plate with excellent hydrogen induced cracking resistance, and manufacturing method of the same

Номер: US20130260164A1
Автор: Hiroki Imamura, Shinsuke Sato, Taku Kato
Принадлежит: Kobe Steel Ltd

A steel plate is provided which has excellent hydrogen induced cracking resistance. The steel plate is suitable for use in a line pipe. The steel plate satisfies a predetermined composition. In a composition of an inclusion contained in the steel and having a width of 1 μm or more, the ratio (RES/CaS) of the mass of an REM sulfide (RES) to that of a Ca sulfide (CaS) is equal to or more than 0.05, a Zr content of the inclusion is in a range of 5 to 60%, and a Nb content of the inclusion is 5% or less.

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Номер записи: 47
10-10-2013 дата публикации

HIGH-STRENGTH GALVANIZED STEEL SHEET WITH HIGH YIELD RATIO HAVING EXCELLENT DUCTILITY AND STRETCH FLANGE FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20130266821A1
Автор: FUKUSHI Keisuke, Kaneko Shinjiro, Kawasaki Yoshiyasu, Nagataki Yasunobu, Nakagaito Tatsuya
Принадлежит: JFE STEEL CORPORATION

A high-strength galvanized steel sheet with high yield ratio having excellent ductility and stretch flange formability, the steel sheet having a chemical composition containing, by mass %, C: 0.04% or more and 0.13% or less, Si: 0.9% or more and 2.3% or less, Mn: 0.8% or more and 2.4% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.01% or more and 0.1% or less, N: 0.008% or less, and the balance being Fe and inevitable impurities and a microstructure including, in terms of area ratio, 94% or more of a ferrite phase and 2% or less of a martensite ferrite phase, wherein mean grain size of ferrite is 10 μm or less, Vickers hardness of ferrite is 140 or more, mean grain size of carbide particles existing at grain boundaries of ferrite is 0.5 μm or less, and aspect ratio of carbide particles existing at the grain boundaries of ferrite is 2.0 or less. 1. A high-strength galvanized steel sheet with high yield ratio having excellent ductility and stretch flange formability , the steel sheet having a chemical composition containing , by mass % , C.: 0.04% or more and 0.13% or less , Si: 0.9% or more and 2.3% or less , Mn: 0.8% or more and 2.4% or less , P: 0.1% or less , S: 0.01% or less , Al: 0.01% or more and 0.1% or less , N: 0.008% or less , and the balance being Fe and inevitable impurities and a microstructure including , in terms of area ratio , 94% or more of a ferrite phase and 2% or less of a martensite ferrite phase , wherein mean grain size of ferrite is 10 μm or less , Vickers hardness of ferrite is 140 or more , mean grain size of carbide particles existing at grain boundaries of ferrite is 0.5 μm or less , and aspect ratio of carbide particles existing at the grain boundaries of ferrite is 2.0 or less.2. The galvanized steel sheet according to claim 1 , wherein the microstructure has a number of crystal grains of ferrite containing 5 or more carbide particles of 0.005 grain/μmor more when the microstructure is observed by using a scanning electron microscope ...

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Номер записи: 48
17-10-2013 дата публикации

High-yield-ratio high-strength steel sheet having excellent workability

Номер: US20130273391A1
Автор: Kazuyuki Hamada, Tatsuya Asai
Принадлежит: Kobe Steel Ltd

A steel sheet according to the present invention has tensile strength of 980 MPa or more, exerts a high-yield ratio, and has excellent workability (in detail, strength-ductility balance). The steel sheet contains: C: 0.06-0.12% (excluding 0.12%); Si: 0.2% or less; Mn: 2.0-3.5%; at least one element selected from the group consisting of Ti, Nb, and V of 0.01-0.15% in total; B: 0.0003-0.005%; P: 0.05% or less; S: 0.05% or less; Al: 0.005-0.1%; N: 0.015% or less; and the balance is iron and unavoidable impurities, in which the content of ferrite is more than 5% to 15% or less, that of martensite is 25-55%, and the total content of bainite and tempered martensite is 30% or more to less than 70%, based on the whole microstructure, and in which the average crystal grain size of the ferrite is 3.0 μm or less.

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Номер записи: 49
28-11-2013 дата публикации

DUPLEX STAINLESS STEEL AND PRODUCTION METHOD THEREFOR

Номер: US20130312880A1
Автор: Amaya Hisashi, HAMADA Masahiko, Motoya Daisuke, Nagayama Hiroyuki, Yamada Kenta
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORORATION

Provided is a duplex stainless steel having a high strength and a high toughness. A stainless steel according to the present invention includes: a chemical composition containing, in mass percent, C: at most 0.030%, Si: 0.20 to 1.00%, Mn: at most 8.00%, P: at most 0.040%, S: at most 0.0100%, Cu: more than 2.00% and at most 4.00%, Ni: 4.00 to 8.00%, Cr: 20.0 to 30.0%, Mo: at least 0.50% and less than 2.00%, N: 0.100 to 0.350%, and sol. Al: at most 0.040%, the balance being Fe and impurities; and a structure, wherein a rate of ferrite in the structure is 30 to 70%, and a hardness of the ferrite in the structure is at least 300 Hv. 1. A duplex stainless steel comprising:a chemical composition containing, in mass percent, C: at most 0.030%, Si: 0.20 to 1.00%, Mn: at most 8.00%, P: at most 0.040%, S: at most 0.0100%, Cu: more than 2.00% and at most 4.00%, Ni: 4.00 to 8.00%, Cr: 20.0 to 30.0%, Mo: at least 0.50% and less than 2.00%, N, 0.100 to 0.350%, and sol. Al: at most 0.040%, the balance being Fe and impurities; and{'sub': '10gf', 'a structure, wherein a rate of ferrite in the structure is 30 to 70%, and a hardness of the ferrite in the structure is at least 300 Hv.'}2. The duplex stainless steel according to claim 1 , whereinthe chemical composition contains V: at most 1.50%, instead of part of the Fe.3. The duplex stainless steel according to claim 1 , whereinthe chemical composition contains at least one type selected from the group consisting of Ca: at most 0.0200%, Mg: at most 0.02%, and B: at most 0.0200%, instead of part of the Fe.4. The duplex stainless steel according to claim 1 , whereinthe chemical composition contains rare earth metal: at most 0.2000%, instead of part of the Fe.5. The duplex stainless steel according to claim 1 , which is subjected to solution treatment at 980 to 1 claim 1 ,200° C. claim 1 , and is further subjected to aging heat treatment at 460 to 630° C.6. A production method for a duplex stainless steel material claim 1 , comprising ...

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Номер записи: 50
12-12-2013 дата публикации

MARAGING STEEL

Номер: US20130327446A1
Автор: KIMURA Ei, NAKANOWATARI Isao, SASAKI Kota, TAKABAYASHI Hiroyuki, TAKAHASHI Satoshi, TANAKA Yuta, Ueta Shigeki, YAMANE Koshiro, YUSA Satoru
Принадлежит:

The present invention provides a maraging steel containing: 0.10≦C≦0.30 mass %, 6.0≦Ni≦9.4 mass %, 11.0≦Co≦20.0 mass %, 1.0≦Mo≦6.0 mass %, 2.0≦Cr≦6.0 mass %, 0.5≦Al≦1.3 mass %, and Ti≦0.1 mass %, with the balance being Fe and unavoidable impurities, and satisfying 1.00≦A≦1.08, in which A is 0.95+0.35×[C]−0.0092×[Ni]+0.011×[Co]−0.02×[Cr]−0.001×[Mo], where [C] indicates a content (mass %) of C, [Ni] indicates a content (mass %) of Ni, [Co] indicates a content (mass %) of Co, [Cr] indicates a content (mass%) of Cr, and [Mo] indicates a content (mass%) of Mo, respectively, The maraging steel has a tensile strength of 2,300 MPa or more and is also excellent in the toughness/ductility and fatigue characteristics. 1. A maraging steel comprising:0.10≦C≦0.30 mass %,6.0≦Ni≦9.4 mass %,11.0≦Co≦20.0 mass %,1.0≦Mo≦6.0 mass %,2.0≦Cr≦6.0 mass %,0.5.≦Al≦1.3 mass %, andTi≦0.1 mass %,with the balance being Fe and unavoidable impurities, {'br': None, '1.00≦A≦1.08\u2003\u2003(1)'}, 'and satisfying the following formula (1)wherein A=0.95+0.35×[C]−0.0092×[Ni]+0.011×[Co]−0.02×[Cr]−0.001×[Mo], in which [C] indicates a content (mass %) of C, [Ni] indicates a content (mass %) of Ni, [Co] indicates a content (mass %) of Co, [Cr] indicates a content (mass %) of Cr, and [Mo] indicates a content (mass %) of Mo, respectively.2. The maraging steel as claimed in claim 1 , wherein:2.5≦Cr≦6.0 mass %. The present invention relates to a maraging steel. More specifically, the present invention relates to a maraging steel which is excellent in the strength and toughness/ductility and is used for an engine shaft and the like.A maraging steel is a steel obtained by subjecting a non-carbon or low-carbon steel containing Ni, Co, Mo, Ti and the like in large amounts to solution heat treatment and quenching+aging treatment.Maraging steels have the following characteristics:(1) owing to formation of soft martensite in a quenched state, the machinability is good;(2) owing to precipitation of an intermetallic ...

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Номер записи: 51
26-12-2013 дата публикации

Material with high resistance to wear

Номер: US20130343944A1
Автор: Devrim Caliskanoglu, Gert Kellezi
Принадлежит: Boehler Edelstahl GmbH and Co KG

Material and method for the production of material with isotropic, mechanical properties and improved wear resistance and high hardness potential. Method includes producing in a powder metallurgical (PM) method a slug or ingot from a material of ledeburite tool steel alloy, and subjecting one of the slug or ingot or a semi-finished product produced from the slug or ingot to full annealing at a temperature of over 1100° C., but at least 10° C. below the fusing temperature of the lowest melting structure phase with a duration of over 12 hrs. In this manner, an average carbide phase size of the material is increased by at least 65%, a surface shape of the material is rounded and a matrix is homogenized. Method further includes subsequently processing the material into thermally tempered tools with high wear resistance occurs or into parts to which abrasive stress is applied.

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Номер записи: 52
09-01-2014 дата публикации

PRECIPITATION HARDENING TYPE MARTENSITIC STAINLESS STEEL, ROTOR BLADE OF STEAM TURBINE AND STEAM TURBINE

Номер: US20140007981A1
Автор: IMAI Kenichi, Murata Yoriharu, Ohnishi Haruki, TAKAKU Reki, YAMADA Masayuki
Принадлежит:

A precipitation hardening type martensitic stainless steel of an embodiment contains: Cr: 8.5 to 12.5%; Mo: 1 to 2%; Ni: 8.5 to 11.5%; Ti: 0.6 to 1.4%; C: 0.0005 to 0.05%; Al: 0.0005 to 0.25%; Cu: 0.005 to 0.75%; Nb: 0.0005 to 0.3%; Si: 0.005 to 0.75%; Mn: 0.005 to 1%; and N: 0.0001 to 0.03% by mass, and the balance of Fe and unavoidable impurities. 1. A precipitation hardening type martensitic stainless steel containing: Cr (chromium): 8.5 to 12.5%; Mo (molybdenum): 1 to 2%; Ni (nickel): 8.5 to 11.5%; Ti (titanium): 0.6 to 1.4%; C (carbon): 0.0005 to 0.05%; Al (aluminum): 0.0005 to 0.25%; Cu (copper): 0.005 to 0.75%; Nb (niobium): 0.0005 to 0.3%; Si (silicon): 0.005 to 0.75%; Mn (manganese): 0.005 to 1%; and N (nitrogen): 0.0001 to 0.03% by mass , and the balance of Fe (iron) and unavoidable impurities.2. The precipitation hardening type martensitic stainless steel according to claim 1 , {'br': None, '[Cr]/([Cr]+[Fe])\u2003\u2003formula (1)'}, 'wherein a value calculated from a formula (1) is equal to or more than 0.1.'}(Here, each bracket in the formula (1) means a content ratio (mass %) of the element in each bracket.)3. The precipitation hardening type martensitic stainless steel according to claim 1 , {'br': None, '[Cr]+3.3[Mo]\u2003\u2003formula (2)'}, 'wherein a value calculated from a formula (2) is equal to or more than 12.5.'}(Here, each bracket in the formula (2) means a content ratio (mass %) of the element in each bracket.)4. The precipitation hardening type martensitic stainless steel according to claim 2 , {'br': None, '[Cr]+3.3[Mo]\u2003\u2003formula (2)'}, 'wherein a value calculated from a formula (2) is equal to or more than 12.5.'}(Here, each bracket in the formula (2) means a content ratio (mass %) of the element in each bracket.)5. The precipitation hardening type martensitic stainless steel according to claim 1 , {'br': None, '195−1200([C]−0.006)−23([Cr]−12)−40([Ni]−9)−16([Mo]+0.5[W]−1.5)−3.75[Al]−34[Ti]−20[Cu]\u2003\u2003formula (3)'}, ' ...

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Номер записи: 53
06-02-2014 дата публикации

Hot stamped article, method of producing hot stamped article, energy absorbing member, and method of producing energy absorbing member

Номер: US20140037980A1
Автор: Kaoru Kawasaki
Принадлежит: Individual

A hot stamped article has a component composition containing, in terms of % by mass, 0.002% to 0.1% of C, 0.01% to 0.5% of Si, 0.5% to 2.5% of Mn+Cr, 0.1% or less of P, 0.01% or less of S, 0.05% or less of t-Al, 0.005% or less of N, and 0.0005% to 0.004% of B which is optionally contained in a case where the Mn+Cr is 1.0% or more, the remainder being Fe and unavoidable impurities. The hot stamped article has a microstructure composed of, in terms of an area ratio, 0% or more and less than 90% of martensite, 10% to 100% of bainite, and less than 0.5% of unavoidable inclusion structures, or a microstructure composed of, in terms of an area ratio, 99.5% to 100% of bainitic ferrite, and less than 0.5% of unavoidable inclusion structures.

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Номер записи: 54
13-02-2014 дата публикации

METHOD FOR MANUFACTURING AND UTILIZING FERRITIC-AUSTENITIC STAINLESS STEEL

Номер: US20140041766A1
Автор: Andersson Jan-Olof, Jonsson Jan Y., Oliver James, Petersson Rachel, Talonen Juho
Принадлежит: OUTOKUMPU OYJ

The invention relates to a method for manufacturing a ferritic-austenitic stainless steel having good formability, good weldability and high elongation. The stainless steel containing the sum of carbon and nitrogen C+N in the range 0.17-0.295 in weight % in which sum C+N a lower carbon content to avoid sensitisation during welding is compensated by an increased nitrogen content to maintain formability is heat treated so that the microstructure of the stainless steel contains 45-75% austenite in the heat treated condition, the remaining microstructure being ferrite, and the measured Mtemperature of the stainless steel is adjusted between 0 and 50° C. in order to utilize the transformation induced plasticity (TRIP) for improving the formability of the stainless steel. 1. Method for manufacturing a ferritic-austenitic stainless steel having good formability , good weldability and high elongation , wherein the stainless steel containing the sum of carbon and nitrogen C+N in the range 0.17-0.295 in weight % in which sum C+N a lower carbon content to avoid sensitisation during welding is compensated by an increased nitrogen content to maintain formability is heat treated so that the microstructure of the stainless steel contains 45-75% austenite in the heat treated condition , the remaining microstructure being ferrite , and the measured Md3o temperature of the stainless steel is adjusted between 0 and 50[deg.] C. in order to utilize the transformation induced plasticity (TRIP) for improving the formability of the stainless steel.2. Method according to claim 1 , wherein the Md3o temperature of the stainless steel is measured by straining the stainless steel and by measuring the fraction of the transformed martensite.3. Method according to wherein the heat treatment is carried out as solution annealing.4. Method according to wherein the heat treatment is carried out as high-frequency induction annealing.5. Method according to wherein the heat treatment is carried out as ...

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Номер записи: 55
06-03-2014 дата публикации

MATERIAL HEATING METHOD

Номер: US20140065563A1
Автор: Lee Kwan Hyung, Lim Gap Soo, Lim Jong Hyob, Park Yong Kook
Принадлежит: HYUNDAI STEEL COMPANY

A material heating method includes: a step of charging a silicon-containing carbon steel material into a heating furnace; a step of preheating the material; a first heating step of raising the temperature of the material; a second heating step of lowering the temperature of the material so as to reduce a temperature difference between the surface and inside of the material; a third heating step of raising the temperature of the material; and a soaking step of reducing the temperature difference between the surface and inside of the material. The temperature of the material in the heating furnace is maintained at the melting point of fayalite or lower. 1. A material heating method comprising:a step of providing a silicon-containing carbon steel material in a heating furnace;a step of preheating the material;a first heating step of raising the temperature of the material;a second heating step of lowering the temperature of the material so as to reduce a temperature difference between the surface and inside of the material;a third heating step of raising the temperature of the material; anda soaking step of reducing the temperature difference between the surface and inside of the material,wherein the temperature of the material in the heating furnace is maintained at the melting point of fayalite or lower.2. The material heating method of claim 1 , wherein the material contains carbon of 0.15 to 1.20 wt % and silicon of 0.10 wt % or more.3. The material heating method of claim 1 , wherein a temperature Tof a first heating zone of the heating furnace for performing the first heating step claim 1 , a temperature Tof a second heating zone of the heating furnace for performing the second heating step claim 1 , a temperature Tof a third heating zone of the heating furnace for performing the third heating step claim 1 , and a temperature Tof a soaking zone of the heating furnace for performing the soaking step are set to satisfy the relation of T Подробнее

Номер записи: 56
01-01-2015 дата публикации

Hot-press formed product and method for manufacturing same

Номер: US20150000802A1
Автор: Junya Naitou, Keisuke Okita, Shushi Ikeda, Toshio Murakami
Принадлежит: Kobe Steel Ltd

Provided is a hot-press molded article that can achieve a high level of balance between high strength and extension by region and has a region corresponding to an energy absorption site and a shock resistant site within a single molded article without applying a welding method by means of having first region having a metal structure containing both 80-97 area % of martensite and 3-20 area % of residual austenite, the remaining structure comprising no more than 5 area %, and a second region having a metal structure comprising 30-80 area % of ferrite, less than 30 area % (exclusive of 0 area %) of bainitic ferrite, no greater than 30 area % (exclusive of 0 area %) of martensite, and 3-20 area % of residual austenite.

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Номер записи: 57
06-01-2022 дата публикации

HOT-ROLLED STEEL SHEET WITH EXCELLENT LOW-TEMPERATURE IMPACT TOUGHNESS AND MANUFACTURING METHOD THEREFOR

Номер: US20220002828A1
Автор: KONG Jung Hyun, LEE Mun-Soo
Принадлежит:

Disclosed are a hot-rolled steel sheet having a thickness of 6 mm or more and an excellent impact property, and a manufacturing method thereof. 1. A hot-rolled steel sheet with excellent low-temperature impact toughness , the hot-rolled steel sheet comprising , in percent (%) by weight of the entire composition , C: more than 0 and 0.03% or less , Si: 0.1 to 1.0% , Mn: more than 0 and 2.0% or less , P: 0.04% or less , Cr: 1.0 to 10% , Ni: more than 0 and 1.5% or less , Ti: 0.01 to 0.5% , Cu: more than 0 and 2.0% or less , N: more than 0 and 0.03% or less , Al: 0.1% or less , the remainder of iron (Fe) and other inevitable impurities ,a value of the following Formula (1) satisfies 200 to 1,150, and {'br': None, '1001.5*C+1150.6*Mn+2000*Ni+395.6*Cu−0.7*Si−1.0*Ti−45*Cr−1.0*P−1.0*Al+1020.5*N\u2003\u2003(1)'}, 'a microstructure of the cross-section perpendicular to the rolling direction has an average grain size of 50 μm or less in which a misorientation between grains is 5° or more.'}(Here, C, Mn, Ni, Cu, Si, Ti, Cr, P, Al and N mean the content (% by weight) of each element)2. The hot-rolled steel sheet according to claim 1 , wherein the hot-rolled steel sheet has a thickness of 6.0 to 25.0 mm and −20° C. Charpy impact energy of 100 J/cmor more.3. The hot-rolled steel sheet according to claim 1 , wherein the value of Formula (1) satisfies 200 to 700.4. The hot-rolled steel sheet according to claim 1 , wherein the hot-rolled steel sheet satisfies the following Formula (2).{'br': None, 'Ti/(C+N)≥10.0\u2003\u2003(2)'}5. The hot-rolled steel sheet according to claim 1 , wherein the microstructure has an average grain size of 70 μm or less in which a misorientation between grains is 15 to 180°.6. The hot-rolled steel sheet according to claim 1 , wherein the microstructure has an average grain size of 50 μm or less in which a misorientation between grains is 5 to 180°.7. The hot-rolled steel sheet according to claim 1 , wherein the microstructure has an average grain size of ...

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Номер записи: 58
06-01-2022 дата публикации

APPARATUS FOR MANUFACTURING THIN STEEL SHEET AND METHOD FOR MANUFACTURING THIN STEEL SHEET

Номер: US20220002829A1
Автор: Harada Hiroshi, SAKAMOTO Masashi, TAKAYAMA Takuya, Yamada Kenji
Принадлежит: NIPPON STEEL CORPORATION

Using an apparatus for manufacturing a thin steel sheet including the followings which are arranged in order: a continuous casting machine () for a thin slab having a slab thickness of 70 mm to 120 mm at a lower end of a mold; a holding furnace () that is configured to maintain a temperature of a cast slab () and/or heats the cast slab (); and a rolling stand () by which finish rolling is performed, the casting speed of the thin slab is set to 4 to 7 m/min, the slab () is reduced at a rolling reduction of 30% or more by the reduction roll () after solidification is completed and when a center temperature of the slab is 1300° C. or higher, and the slab () is held at a temperature of 1150° C. or higher and 1300° C. or lower for five minutes or longer in the holding furnace (). 16-. (canceled)7. An apparatus for manufacturing a thin steel sheet , with which continuous casting , passing-through a holding furnace , and finish rolling are able to be continuously performed without cutting a slab , the apparatus comprising the followings which are arranged in order:a continuous casting machine for a thin slab having a slab thickness of 70 mm to 120 mm at a lower end of a mold;the holding furnace that is configured to maintain a temperature of a cast slab and/or heats the cast slab; anda rolling stand by which finish rolling is performed,wherein the apparatus has a reduction roll on a downstream side of a solidification completion position of the slab in the continuous casting machine, andthe slab is able to be reduced by the reduction roll.8. The apparatus for manufacturing a thin steel sheet according to claim 7 ,wherein the holding furnace is one of a furnace in which the slab passes through an atmosphere kept at a high temperature and a furnace in which the slab is heated by induction heating.9. A method for manufacturing a thin steel sheet using the apparatus for manufacturing a thin steel sheet according to claim 7 , the method comprising:setting a casting speed of the ...

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Номер записи: 59
06-01-2022 дата публикации

COATED STEEL MEMBER, COATED STEEL SHEET, AND METHODS FOR PRODUCING SAME

Номер: US20220002830A1
Автор: Maeda Daisuke, TABATA Shinichiro
Принадлежит: NIPPON STEEL CORPORATION

This coated steel member includes: a steel sheet substrate having a predetermined chemical composition; and a coating formed on a surface of the steel sheet substrate and containing Al and Fe, in which the coating has a low Al content region having an Al content of 3 mass % or more and less than 30 mass % and a high Al content region formed on a side closer to a surface than the low Al content region and having an Al content of 30 mass % or more, a maximum C content of the high Al content region is 25% or less of a C content of the steel sheet substrate, a maximum C content of the low Al content region is 40% or less of the C content of the steel sheet substrate, and a maximum C content in a range from an interface between the steel sheet substrate and the coating to a depth of 10 μm on a side of the steel sheet substrate is 80% or less of the C content of the steel sheet substrate. 1. A coated steel member comprising: C: 0.25% to 0.65%,', 'Si: 0.10% to 2.00%,', 'Mn: 0.30% to 3.00%,', 'P: 0.050% or less,', 'S: 0.0100% or less,', 'N: 0.010% or less,', 'Ti: 0.010% to 0.100%,', 'B: 0.0005% to 0.0100%,', 'Nb: 0.02% to 0.10%,', 'Mo: 0% to 1.00%,', 'Cu: 0% to 1.00%,', 'Cr: 0% to 1.00%,', 'Ni: 0% to 1.00%,', 'V: 0% to 1.00%,', 'Ca: 0% to 0.010%,', 'Al: 0% to 1.00%,', 'Sn: 0% to 1.00%,', 'W: 0% to 1.00%,', 'Sb: 0% to 1.00%,', 'REM: 0% to 0.30%, and', 'a remainder of Fe and impurities; and, 'a steel sheet substrate containing, as a chemical composition, by mass %,'}a coating formed on a surface of the steel sheet substrate and containing Al and Fe,wherein the coating has a low Al content region having an Al content of 3 mass % or more and less than 30 mass % and a high Al content region formed on a side closer to a surface than the low Al content region and having an Al content of 30 mass % or more,a maximum C content of the high Al content region is 25% or less of a C content of the steel sheet substrate,a maximum C content of the low Al content region is 40% or less of the ...

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Номер записи: 60
06-01-2022 дата публикации

METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND GRAIN-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20220002831A1
Автор: ATSUMI Haruhiko, Kataoka Takashi, MIZUKAMI Kazumi, Morishige Nobusato, Suwa Yoshihiro, TANAKA Ichiro, YAMAGATA Ryutaro
Принадлежит: NIPPON STEEL CORPORATION

Grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties is provided. The method for manufacturing grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties includes a process of heating to 1280° C. or more and hot rolling a slab containing, by mass %, Bi and a predetermined composition of constituents and having a balance of Fe and impurities so as to obtain hot rolled steel sheet, a process, after hot rolling annealing the hot rolled steel sheet, of cold rolling it one time or cold rolling it two times or more with process annealing performed interposed so as to obtain cold rolled steel sheet, a process of rapidly heating then decarburization annealing the steel sheet, a process of coating the surface of the cold rolled steel sheet after decarburization annealing with an annealing separator containing predetermined compounds including sulfates or sulfides and having MgO as its main constituent, then performing finish annealing, a process of performing strictly controlled finish annealing, and a process of coating an insulating coating, then performing flattening annealing. 2. Grain-oriented electrical steel sheet comprising a base metal steel sheet containing , by mass % , C: 0.005% or less , Si: 2.5 to 4.5% , and Mn: 0.01 to 0.15% and having a balance of Fe and impurities and a primary coating formed on a surface of the base metal steel sheet and containing MgSiOas its main constituent , in which grain-oriented electrical steel sheet ,{'sub': 'Al', 'a peak position Dof Al emission intensity obtained when analyzing the elements by glow discharge optical emission spectrometry from a surface of the primary coating in a thickness direction of the grain-oriented electrical steel sheet is present in a range from the surface of the primary coating to 2.0 to 12.0 μm in the thickness direction,'}{'sup': '2', 'a number density ND of the Al oxides is 0.02 to 0.20/μm,'}{'sub': 'S', 'a peak position Dof S ...

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Номер записи: 61
06-01-2022 дата публикации

PRODUCTION METHOD FOR HIGH-STRENGTH STEEL SHEET

Номер: US20220002832A1
Автор: Kaneko Shinjiro, Minami Hidekazu
Принадлежит: JFE STEEL CORPORATION

A production method for a high-strength steel sheet having a tensile strength TS of 780 MPa or more is provided. The production method comprises: heating a steel slab having a predetermined chemical composition; hotrolling the steel slab; coiling the hot-rolled sheet; subjecting the hot-rolled sheet to pickling treatment; holding the hot-rolled sheet in a pre-determined temperature range for predetermined time; cold rolling the hot-rolled sheet to obtain a cold-rolled sheet; subjecting the cold-rolled sheet to first annealing treatment; cooling the cold-rolled sheet at a pre-determined average cooling rate; cooling the cold-rolled sheet to room temperature; reheating the clod-rolled sheet to perform second annealing treatment; cooling the cold-rolled sheet at a first average cooling rate; cooling the cold-rolled sheet at a second average cooling rate; reheating the cold-rolled sheet to a predetermined reheating temperature range; and holding the cold-rolled sheet in the reheating temperature range. 1. A production method for a high-strength steel sheet having a tensile strength TS of 780 MPa or more , the production method comprising: C: 0.08% or more and 0.35% or less,', 'Si: 0.50% or more and 2.50% or less,', 'Mn: 1.50% or more and 3.00% or less,', 'P: 0.001% or more and 0.100% or less,', 'S: 0.0001% or more and 0.0200% or less, and', 'N: 0.0005% or more and 0.0100% or less,', 'optionally, in mass %, at least one element selected from the group consisting of', 'Al: 0.01% or more and 1.00% or less,', 'Ti: 0.005% or more and 0.100% or less,', 'Nb: 0.005% or more and 0.100% or less,', 'V: 0.005% or more and 0.100% or less,', 'B: 0.0001% or more and 0.0050% or less,', 'Cr: 0.05% or more and 1.00% or less,', 'Cu: 0.05% or more and 1.00% or less,', 'Sb: 0.0020% or more and 0.2000% or less,', 'Sn: 0.0020% or more and 0.2000% or less,', 'Ta: 0.0010% or more and 0.1000% or less,', 'Ca: 0.0003% or more and 0.0050% or less,', 'Mg: 0.0003% or more and 0.0050% or less, and', ' ...

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Номер записи: 62
07-01-2021 дата публикации

Electric resistance welded steel pipe for producing hollow stabilizer, hollow stabilizer, and production methods for same

Номер: US20210001425A1
Автор: Hiromichi Hori, Hiroshi Nakata, Masatoshi Aratani, Ryoji Matsui, Tomonori Kondo
Принадлежит: JFE Steel Corp

There are provided an electric resistance welded steel pipe for producing a high strength hollow stabilizer excellent in fatigue resistance and a high strength hollow stabilizer. In an electric resistance welded steel pipe (5) for producing a hollow stabilizer, an internal weld bead cut portion (30) has a three-peak shape and a depth (H) of a trough portion (30a) of the three-peak shape is 0.3 mm or less and an angle (θ) formed by a central portion in the circumferential direction of the trough portion (30a) and the top of right and left peak portions (30b, 30c) located on both the right and left sides of the trough portion (30a) is 160° or more and less than 180°.

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Номер записи: 63
07-01-2016 дата публикации

METHOD FOR PRODUCING POWDER METAL COMPOSITIONS FOR WEAR AND TEMPERATURE RESISTANCE APPLICATIONS AND METHOD OF PRODUCING SAME

Номер: US20160001369A1
Автор: "LEsperance Gilles", Beaulieu Philippe, Christopherson, Farthing Leslie John, JR. Denis B., Schoenwetter Todd
Принадлежит:

A powder metal composition for high wear and temperature applications is made by atomizing a melted iron based alloy including 3.0 to 7.0 wt. % carbon; 10.0 to 25.0 wt. % chromium; 1.0 to 5.0 wt. % tungsten; 3.5 to 7.0 wt. % vanadium; 1.0 to 5.0 wt. % molybdenum; not greater than 0.5 wt. % oxygen; and at least 40.0 wt. % iron. The high carbon content reduces the solubility of oxygen in the melt and thus lowers the oxygen content to a level below which would cause the carbide-forming elements to oxidize during atomization. The powder metal composition includes metal carbides in an amount of at least 15 vol. %. The microhardness of the powder metal composition increases with increasing amounts of carbon and is typically about 800 to 1,500 Hv50. 1. A method of forming a powder metal composition , comprising the steps of:providing a melted iron based alloy including 3.0 to 7.0 wt. % carbon, 10.0 to 25.0 wt. % chromium, 1.0 to 5.0 wt. % tungsten, 3.5 to 7.0 wt. % vanadium, 1.0 to 5.0 wt. % molybdenum, not greater than 0.5 wt. % oxygen, and at least 40.0 wt. % iron, based on the total weight of the melted iron based alloy; andatomizing the melted iron based alloy to provide atomized droplets of the iron based alloy.2. The method of including grinding the atomized droplets to remove oxide skin from the atomized droplets.3. The method of claim 1 , wherein the atomizing step includes forming metal carbides in an amount of at least 15 vol. % claim 1 , based on the total volume of the melted iron based alloy.4. The method of claim 3 , wherein the metal carbides are selected from the group consisting of: M8C7 claim 3 , M7C3 claim 3 , M6C claim 3 , wherein M is at least one metal atom and C is carbon.5. The method of claim 4 , wherein M8C7 is (V63Fe37)8C7; M7C3 is selected from the group consisting of: (Cr34Fe66)7C3 claim 4 , Cr3.5Fe3.5C3 claim 4 , and Cr4Fe3C3; and M6C is selected from the group consisting of: Mo3Fe3C claim 4 , Mo2Fe4C claim 4 , W3Fe3C claim 4 , and W2Fe4C.6. ...

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Номер записи: 64
04-01-2018 дата публикации

METHOD FOR PRODUCING POWDER METAL COMPOSITIONS FOR WEAR AND TEMPERATURE RESISTANCE APPLICATIONS

Номер: US20180001387A1
Автор: "LEsperance Gilles", Beaulieu Philippe, Christopherson, Farthing Leslie John, JR. Denis B., Schoenwetter Todd
Принадлежит:

A powder metal composition for high wear and temperature applications is made by atomizing a melted iron based alloy including 3.0 to 7.0 wt. % carbon; 10.0 to 25.0 wt. % chromium; 1.0 to 5.0 wt. % tungsten; 3.5 to 7.0 wt. % vanadium; 1.0 to 5.0 wt. % molybdenum; not greater than 0.5 wt. % oxygen; and at least 40.0 wt. % iron. The high carbon content reduces the solubility of oxygen in the melt and thus lowers the oxygen content to a level below which would cause the carbide-forming elements to oxidize during atomization. The powder metal composition includes metal carbides in an amount of at least 15 vol. %. The microhardness of the powder metal composition increases with increasing amounts of carbon and is typically about 800 to 1,500 Hv50. 1. A method of forming a powder metal composition , comprising the steps of:providing a melted iron based alloy including 3.0 to 7.0 wt. % carbon, 10.0 to 25.0 wt. % chromium, 1.0 to 5.0 wt. % tungsten, 3.5 to 7.0 wt. % vanadium, 1.0 to 5.0 wt. % molybdenum, not greater than 0.5 wt. % oxygen, and at least 40.0 wt. % iron, based on the total weight of the melted iron based alloy; andatomizing the melted iron based alloy to provide atomized droplets of the iron based alloy.2. The method of including grinding the atomized droplets to remove oxide skin from the atomized droplets.3. The method of claim 1 , wherein the atomizing step includes forming metal carbides in an amount of at least 15 vol. % claim 1 , based on the total volume of the melted iron based alloy.4. The method of claim 3 , wherein the metal carbides are selected from the group consisting of: M8C7 claim 3 , M7C3 claim 3 , M6C claim 3 , wherein M is at least one metal atom and C is carbon.5. The method of claim 4 , wherein M8C7 is (V63Fe37)8C7; M7C3 is selected from the group consisting of: (Cr34Fe66)7C3 claim 4 , Cr3.5Fe3.5C3 claim 4 , and Cr4Fe3C3; and M6C is selected from the group consisting of: Mo3Fe3C claim 4 , Mo2Fe4C claim 4 , W3Fe3C claim 4 , and W2Fe4C.6. ...

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Номер записи: 65
03-01-2019 дата публикации

Method for producing a pre-coated metal sheet

Номер: US20190001438A1
Автор: Ehling Wolfram
Принадлежит: ArcelorMittal

This method for preparing a pre-coated metal sheet for welding thereof to another pre-coated metal sheet, containing the following successive steps: 133-. (canceled)34. A method for preparing a pre-coated metal sheet for welding thereof to another pre-coated metal sheet , comprising the following successive steps:providing a pre-coated metal sheet comprising a metal substrate provided, on at least one of its faces, with a pre-coating layer, thenremoving, on at least one face of said pre-coated metal sheet, at least part of said pre-coating layer so as to form a removal zone, said removal being done by an impact of a laser beam on said pre-coating layer, the removal step comprising, over the course of the removal, the relative displacement of said laser beam with respect to the metal sheet in a direction of advance,wherein during the removal, the laser beam is inclined relative to the face of the metal sheet such that the orthogonal projection of the laser beam on said face of the metal sheet is located in the zone of the metal sheet in which the removal has already been done, and wherein the laser beam forms an angle of inclination comprised between 12° and 50° with the direction normal to the face of the metal sheet.35. The method according to claim 34 , wherein the pre-coating layer is a layer of aluminum claim 34 , an aluminum-based layer or a layer of aluminum alloy.36. The method according to claim 34 , wherein the pre-coating layer is a layer of aluminum alloy further comprising silicon.37. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 15° and 45°.38. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 20° and 40°.39. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 25° and 40°.40. The method according to claim 34 , wherein the angle of inclination of the laser beam is comprised between 25 ...

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Номер записи: 66
07-01-2016 дата публикации

METHOD FOR HEAT-TREATING A MANGANESE STEEL PRODUCT AND MANGANESE STEEL PRODUCT

Номер: US20160002746A1
Автор: Arenholz Enno, Samek Ludovic
Принадлежит: VOESTALPINE STAHL GMBH

A method for heat treating a manganese steel product whose alloy comprises: 1. Method for heat treating a manganese steel product whose alloy comprises:a carbon fraction (C) between 0.09 and 0.15 wt. %, anda manganese fraction (Mn) in the range of 3.5 wt. %≦Mn≦4.9 wt. %, andfractions of bainite microstructure,wherein the method comprises the following steps:{'b': 4', '1, 'claim-text': [{'b': 1', '1, 'heating (E) the steel product to a first holding temperature (T), which lies above 780° C.,'}, {'b': 1', '1', '1, 'holding (H) the steel product during a first time period (Δ) at the first holding temperature (T),'}, {'b': '1', 'cooling (A) the steel product,'}], 'performing a first annealing process (S.) with the following substeps'}{'b': 4', '2, 'claim-text': [{'b': 2', '2, 'heating (E) the steel product to a holding temperature (T), which lies above 630° C. and below 660° C.,'}, {'b': 2', '2', '2, 'holding (H) the steel product during a second time period (Δ) at the holding temperature (T),'}, {'b': '2', 'cooling (A) the steel product,'}, {'b': 1', '2', '4', '1', '4', '2, 'wherein the cooling (A; A) of the steel product during the first annealing process (S.) and/or during the second annealing process (S.) is carried out at a cooling rate which lies between 25 Kelvin/second and 200 Kelvin/second and'}], 'performing a second annealing process (S.) with the following substeps'}wherein the method is carried out after a hot rolling and a cold rolling step.211. The method according to claim 1 , wherein the first holding temperature (T) is selected so that during the holding (H) of the steel product claim 1 , the steel product is located in the austenitic range (γ) above 780° .312. The method according to wherein the cooling (A; A) of the steel product is carried out at a cooling rate which lies between 40 Kelvin/second and 150 Kelvin/second.422. The method according to claim 1 , wherein the second holding temperature (T) is selected so that during holding (H) of the steel ...

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Номер записи: 67
07-01-2016 дата публикации

METHOD FOR PRODUCING A CORROSION-RESISTANT STEEL SHEET

Номер: US20160002748A1
Автор: KÖHL Manuel, Nouskalis Dimitrios, Oberhoffer Helmut, Sauer Reiner, Szesni Anika
Принадлежит:

A method for producing a corrosion-resistant steel sheet made of an unalloyed or low-alloy and cold-rolled steel having a carbon content of less than 0.1 wt %. The method includes the following steps: applying a metal coating to the steel sheet; annealing the coated steel sheet in a recrystallizing manner by heating the coated steel sheet to temperatures in the recrystallization range by electromagnetic induction in an inert-gas atmosphere; and quenching the coated and annealed steel sheet. The metal coating is fused on during the recrystallization annealing. 1. Method for producing a corrosion-resistant steel sheet made of an unalloyed or low-alloy and cold-rolled steel with a carbon content of less than 0.1% , the method comprising the following steps:applying a metal coating on the steel sheet;recrystallization annealing of the coated steel sheet by heating to temperatures in the recrystallizing range by electromagnetic induction in an inert gas atmosphere, wherein the metal coating melts during the recrystallization annealing;quenching of the coated and annealed steel sheet.2. Method according to claim 1 , wherein claim 1 , after the recrystallization annealing claim 1 , the coated steel sheet is quenched at a cooling rate of at least 100 K/s claim 1 , and preferably of more than 500 K/s claim 1 , wherein a multiphase structure is formed in the steel claim 1 , which comprises ferrite and at least one of the structural components martensite claim 1 , bainite claim 1 , and/or residual austenite.3. Method according to claim 1 , wherein the steel sheet is heated during the recrystallization annealing to temperatures higher than 550° C. claim 1 , and preferably higher than 700° C. claim 1 , at a heating rate of more than 75 K/s claim 1 , and preferably of more than 100 K/s.4. Method according to wherein the steel hasa manganese content of less than 0.4 wt %;a silicon content of less than 0.04 wt %;an aluminum content of less than 0.1 wt %;and a chromium content of ...

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Номер записи: 68
07-01-2016 дата публикации

High Strength, High Toughness Steel Alloy

Номер: US20160002757A1
Автор: Novotny Paul M.
Принадлежит:

A high strength, high toughness steel alloy is disclosed. The alloy has the following weight percent composition. 2. The alloy as set forth in wherein the alloy contains at least about 0.002% yttrium.3. The alloy as set forth in wherein the alloy contains not more than about 0.020% yttrium.4. The alloy as set forth in wherein the alloy contains not more than about 0.006% magnesium.5. The alloy as set forth in wherein the alloy contains not more than about 0.002% calcium.6. The alloy as set forth in wherein the alloy contains at least about 0.35% carbon.7. The alloy as set forth in wherein the alloy contains not more than about 2.0% chromium.8. The alloy as set forth in wherein Mo+½ W is at least about 0.4%.9. The alloy as set forth in wherein Mo+½ W is not more than about 1.1%.10. The alloy as set forth in wherein the alloy contains at least about 0.40% carbon.11. The alloy as set forth in wherein the alloy contains at least about 4.0% nickel.14. A hardened and tempered article made from a high strength claim 1 , high toughness steel alloy as set forth in wherein the article is tempered at a temperature of about 500° F. to 600° F.15. The hardened and tempered article as set forth in which provides a room temperature tensile strength of at least about 295 ksi and a Charpy V-notch impact toughness of at least about 15 ft-lbs. This application is a continuation of U.S. application Ser. No. 13/457,631, filed Apr. 27, 2012, the entirety of which is incorporated herein by reference.1. Field of the InventionThis invention relates to high strength, high toughness steel alloys, and in particular, to such an alloy that provides a unique combination of tensile strength and toughness when hardened and tempered.2. Description of the Related ArtAge-hardenable martensitic steels that provide a combination of very high strength and toughness are known. Among the known steels are those described in U.S. Pat. No. 4,076,525 and U.S. Pat. No. 5,087,415. The former is known as AF1410 ...

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Номер записи: 69
07-01-2016 дата публикации

High-toughness low-alloy wear-resistant steel sheet and method of manufacturing the same

Номер: US20160002759A1
Автор: Hongbin Li, Kougen WU, Liandeng Yao, Yuchuan MIAO
Принадлежит: Baoshan Iron and Steel Co Ltd

A high-toughness low-alloy wear-resistant steel sheet and a method of manufacturing the same, which has the chemical compositions (wt %): C: 0.08-0.20%; Si: 0.10-0.60%; Mn: 1.00-2.00%; B: 0.0005-0.0040%; Cr: less than or equal to 1.50%; Mo: less than or equal to 0.80%; Ni: less than or equal to 1.50%; Nb: less than or equal to 0.080%; V: less than or equal to 0.080%; Ti: less than or equal to 0.060%; Al: 0.010-0.080%, Ca: 0.0010-0.0080%, N: less than or equal to 0.0080%, 0: less than or equal to 0.0080%, H: less than or equal to 0.0004%, P: less than or equal to 0.015%, S: less than or equal to 0.010%, and (Cr/5+Mn/6+50B): more than or equal to 0.20% and less than or equal to 0.55%; (Mo/3+Ni/5+2Nb): more than or equal to 0.02% and less than or equal to 0.45%; (Al+Ti): more than or equal to 0.01% and less than or equal to 0.13%, the remainders being Fe and unavoidable impurities. The present invention reduces the contents of carbon and alloy elements, and makes full use of the characteristics of refinement, strengthening, etc. of micro-alloy elements such as Nb, Ti, etc., and through TMCP process, the wear-resistant steel sheet has high strength, high hardness, good toughness, good weldability, excellent wear-resistant performance, and is applicable to wearing parts in various mechanical equipments.

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Номер записи: 70
07-01-2016 дата публикации

HIGH-STRENGTH STEEL SHEET AND PRODUCTION METHOD THEREFOR AND HIGH-STRENGTH GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR (AS AMENDED)

Номер: US20160002762A1
Автор: Fushiwaki Yusuke, Kawasaki Yoshiyasu, Nagataki Yasunobu
Принадлежит: JFE STEEL CORPORATION

Provided is a high-strength steel sheet that has good chemical convertibility and good corrosion resistance after electro deposition painting despite high Si and Mn contents. Also provided are a method for producing the high-strength steel sheet, a high-strength galvanized steel sheet formed by using the high-strength steel sheet, and a method for producing the high-strength galvanized steel sheet. A steel sheet containing, in terms of % by mass, C: 0.03 to 0.35%, Si: 0.01 to 0.50%, Mn: 3.6 to 8.0%, Al: 0.001 to 1.00%, P≦0.10%, S≦0.010%, and the balance being Fe and unavoidable impurities is annealed under condition under which a dew point of an atmosphere in a temperature zone of 550° C. or higher and A° C. or lower (A is a particular value that satisfies 600≦A≦750) inside an annealing furnace is controlled to −40° C. or lower. 1. A method for producing a high-strength steel sheet , comprising:an annealing step of annealing a steel sheet containing, in terms of % by mass, C: 0.03 to 0.35%, Si: 0.01 to 0.50%, Mn: 3.6 to 8.0%, Al: 0.001 to 1.00%, P≦0.10%, S≦0.010%, and the balance being Fe and unavoidable impurities, wherein annealing is conducted under a condition under which a dew point of an atmosphere in a temperature zone of 550° C. or higher and A° C. or lower (A is a particular value that satisfies 600≦A≦750) inside an annealing furnace is controlled to −40° C. or lower.2. The method for producing a high-strength steel sheet according to claim 1 , further comprising an electrolytic pickling step of electrolytically pickling the steel sheet that has been subjected to the annealing step claim 1 , in an aqueous solution containing sulfuric acid.3. The method for producing a high-strength steel sheet according to claim 1 , wherein the steel sheet has a composition further containing at least one element selected from B: 0.001 to 0.005% claim 1 , Nb: 0.005 to 0.05% claim 1 , Ti: 0.005 to 0.05% claim 1 , Cr: 0.001 to 1.0% claim 1 , Mo: 0.05 to 1.0% claim 1 , Cu: 0. ...

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Номер записи: 71
05-01-2017 дата публикации

Quench and temper corrosion resistant steel alloy

Номер: US20170002447A1
Автор: David E. Wert
Принадлежит: CRS Holdings LLC

A quench and temper steel alloy is disclosed having the following composition in weight percent. C 0.2-0.5 Mn 0.1-1.0 Si 0.1-1.2 Cr   9-14.5 Ni 2.0-5.5 Mo 1-2 Cu   0-1.0 Co 1-4 W 0.2 max. V 0.1-1.0 Ti up to 0.5 Nb   0-0.5 Ta   0-0.5 Al   0-0.25 Ce   0-0.01 La   0-0.01 The balance of the alloy is iron and the usual impurities including not more than about 0.01% phosphorus, not more than about 0.010% sulful, and not more than about 0.10% nitrogen. A quenched and tempered steel article made from this alloy is also disclosed. The steel article is characterized by a tensile strength of at least about 290 ksi, a fracture toughness (k Ic ) of at least about 65 ksi, good resistance to general corrosion, and good resistance to pitting corrosion.

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Номер записи: 72
07-01-2016 дата публикации

PROCESS OF MANUFACTURING HIGH-STRENGTH COLD ROLLED STEEL SHEETS

Номер: US20160002807A1
Автор: TAIRA Shoichiro, TANIMOTO Wataru
Принадлежит: JFE STEEL CORPORATION

A process of manufacturing high-strength cold rolled steel sheets containing 0.5 to 2.0 mass % silicon includes a pickling step of thermally annealing a steel sheet in a non-oxidizing atmosphere and thereafter pickling the steel sheet to dissolve away 0.5 g/mto less than 2.0 g/mof the steel sheet, and an electroplating step of electroplating the surface of the pickled steel sheet with zinc under such conditions that a coating mass of 100 to 5000 mg/mis obtained. 13.-. (canceled)4. A process of manufacturing high-strength cold rolled steel sheets containing 0.5 to 2.0 mass % silicon , comprising:{'sup': 2', '2, 'a pickling step of thermally annealing a steel sheet in a non-oxidizing atmosphere and thereafter pickling the steel sheet to dissolve away 0.5 g/mto less than 2.0 g/mof the steel sheet, and'}{'sup': '2', 'an electroplating step of electroplating the surface of the pickled steel sheet with zinc under such conditions that a coating mass of 100 to 5000 mg/mis obtained.'}5. The process according to claim 4 , wherein the non-oxidizing atmosphere is obtained by introducing a mixture gas containing nitrogen and hydrogen claim 4 ,the hydrogen content in the non-oxidizing atmosphere is not more than 10 vol %, andthe temperature of heating during the thermal annealing is not more than 900° C.6. The process according to claim 4 , further comprising an aqueous solution contact step of bringing the steel sheet after the electroplating step into contact with a P-containing aqueous solution having a concentration of not less than 0.001 g/L at a temperature of the P-containing aqueous solution of not less than 30° C.7. The process according to claim 5 , further comprising an aqueous solution contact step of bringing the steel sheet after the electroplating step into contact with a P-containing aqueous solution having a concentration of not less than 0.001 g/L at a temperature of the P-containing aqueous solution of not less than 30° C. This disclosure relates to a process ...

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Номер записи: 73
04-01-2018 дата публикации

HEAT TREATABLE STEEL, PRODUCT FORMED THEREOF HAVING ULTRA HIGH STRENGTH AND EXCELLENT DURABILITY, AND METHOD FOR MANUFACTURING SAME

Номер: US20180002775A1
Автор: Cho Yeol-Rae, Lee Jae-Hoon, PARK Ki-Hyun
Принадлежит:

The present invention relates to a formed product used in vehicle components and the like, and to a method for manufacturing the same. The present invention provides heat treatable steel, a formed product using the same having ultra-high strength and excellent durability, and a method for manufacturing the same, wherein the heat treatable steel contains, in wt %, C (0.22-0.42%), Si (0.05-0.3%), Mn (1.0-1.5%), Al (0.01-0.1%), P (0.01% or less (including 0), S (0.005% or less), Mo (0.05-0.3%), Ti (0.01-0.1%), Cr (0.05-0.5%), B (0.0005-0.005%), N (0.01% or less), the balance Fe, and other inevitable impurities, Mn and Si satisfying Relationship formula (1), below, Mo/p satisfying Relationship formula (2), below: [Relationship formula 1] Mn/Si≧5 [Relationship formula 2] Mo/P≧15. 1. Heat treatable steel comprising , by wt % , carbon (C): 0.22% to 0.42% , silicon (Si): 0.05% to 0.3% , manganese (Mn): 1.0% to 1.5% , aluminum (Al): 0.01% to 0.1% , phosphorus (P): 0.01% or less (including 0%) , sulfur (S): 0.005% or less , molybdenum (Mo): 0.05% to 0.3% , titanium (Ti): 0.01% to 0.1% , chromium (Cr): 0.05% to 0.5% , boron (B): 0.0005% to 0.005% , nitrogen (N): 0.01% or less , and a balance of iron (Fe) and inevitable impurities , wherein Mn and Si in the heat treatable steel satisfy Formula 1 , below , and Mo/P in the heat treatable steel satisfies Formula 2 , below:{'br': None, 'Mn/Si≧5\u2003\u2003[Formula 1]'}{'br': None, 'Mo/P≧15\u2003\u2003[Formula 2]'}2. The heat treatable steel of claim 1 , wherein the heat treatable steel further comprises at least one or two selected from the group consisting of niobium (Nb): 0.01% to 0.07% claim 1 , copper (Cu): 0.05% to 1.0% claim 1 , and nickel (Ni): 0.05% to 1.0%.3. The heat treatable steel of claim 1 , wherein the heat treatable steel has a microstructure comprising ferrite and pearlite claim 1 , or a microstructure comprising ferrite claim 1 , pearlite claim 1 , and bainite.4. The heat treatable steel of claim 1 , wherein the ...

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Номер записи: 74
04-01-2018 дата публикации

Non-oriented electrical steel sheet and method for manufacturing thereof

Номер: US20180002776A1
Автор: Ichiro Tanaka, Satoshi Kano, Takeaki Wakisaka
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A non-oriented electrical steel sheet includes C: 0 to 0.0050 mass %, Si: 0.50 to 2.70 mass %, Mn: 0.10 to 3.00 mass %, Al: 1.00 to 2.70 mass %, and P: 0.050 to 0.100 mass %. In the non-oriented electrical steel sheet, Al/(Si+Al+0.5×Mn) is 0.50 to 0.83, Si+Al/2+Mn/4+5×P is 1.28 to 3.90, Si+Al+0.5×Mn is 4.0 to 7.0, the ratio of the intensity of {100} plane I{100} to the intensity of {111} plane I{111} is 0.50 to 1.40, the specific resistance is 60.0×10 −8 Ω·m or higher at room temperature, and the thickness is 0.05 mm to 0.40 mm.

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Номер записи: 75
04-01-2018 дата публикации

HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Номер: US20180002777A1
Автор: Funakawa Yoshimasa, Kariya Nobusuke, KAWAMURA Kenji, MORI Kazuma, Ono Yoshihiko, Sugihara Reiko
Принадлежит: JFE STEEL CORPORATION

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 30% or more of a ferrite phase, 40% to 65% of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 40% to 55% and the total area ratio of a bainite phase having a grain diameter of more than 5 μm and/or a martensite phase having a grain diameter of more than 5 μm is 20% or less, and a tensile strength is 980 MPa or more. 1. A high-strength steel sheet havinga chemical composition containing, by mass %, C: 0.070% to 0.100%, Si: 0.30% to 0.70%, Mn: 2.20% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N: 0.0050% or less, Nb: 0.010% to 0.060%, Ti: 0.010% to 0.030%, B: 0.0005% to 0.0030%, Ca: 0.0015% or less, and the balance being Fe and inevitable impurities;a microstructure including, in terms of area ratio, 30% or more of a ferrite phase, 40% to 65% of a bainite phase and/or a martensite phase, and 5% or less of cementite,wherein, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 40% to 55% and the total area ratio of a bainite phase having a grain diameter of more than 5 μm and/or a martensite phase having a grain diameter of more than 5 μm is 20% or less; anda tensile strength being 980 MPa or more.2. The high-strength steel sheet according to wherein the chemical composition further contains at least one element selected from at least one group consisting of claim 1 , by mass % claim 1 ,group I: Sb: 0.005% to 0.015%,grow:, II: one or more elements selected from Cr: 0.30% or less, V: 0.10% or less, Mo: 0.20% or less, Cu: 0.10% or less, and Ni: 0.10% ...

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Номер записи: 76
04-01-2018 дата публикации

HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Номер: US20180002778A1
Автор: Funakawa Yoshimasa, Kariya Nobusuke, KAWAMURA Kenji, MORI Kazuma, Ono Yoshihiko, Sugihara Reiko
Принадлежит: JFE STEEL CORPORATION

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 MPa or more. 1. A high-strength steel sheet havinga chemical composition containing, by mass %, C: 0.100% to 0.150%, Si: 0.30% to 0.70%, Mn: 2.20% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N: 0.0050% or less, Nb: 0.010% to 0.060%, Ti: 0.010% to 0.030%, B: 0.0005% to 0.0030%, Sb: 0.005% to 0.015%, Ca: 0.0015% or less, and the balance being Fe and inevitable impurities,a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite,wherein, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, anda tensile strength being 1180 MPa or more.2. The high-strength steel sheet according to claim 1 , wherein the chemical composition further contains at least one element selected from at least one group consisting of claim 1 , by mass % claim 1 ,Group I: one or more elements selected from Cr: 0.30% or less V: 0.10% or less Mo: 0.20% or less, Cu: 0.10% or less, and Ni: 0.10% or less, andGroup II: REM: 0.0010% to 0.0050%.3. The high-strength steel sheet according to claim 1 , the steel sheet further having a YR of 0.85 or less.4. The high-strength steel sheet according to claim 2 , the steel sheet further having a YR of 0.85 or less.5. A method for manufacturing a high-strength steel sheet having a tensile ...

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Номер записи: 77
04-01-2018 дата публикации

Martensitic Stainless Steel with High Strength, High Toughness and High Corrosion Resistance

Номер: US20180002791A1
Автор: Hashizume Shuji, Taniguchi Tomomi
Принадлежит:

A method of producing a high performance stainless steel exhibiting corrosion resistance even under a very severe corrosion environment at temperatures of equal to or higher than 180° C., for example, 220° C., while maintaining strength and toughness by improving the corrosion resistance of a conventional martensitic stainless steel with high strength. The martensitic stainless steel includes, in mass %, C: 0.005% to 0.05%, Si: equal to or less than 1.0%, Mn: equal to or less than 2.0%, Cr: 16 to 18%, Ni: 2.5 to 6.5%, Mo: 1.5 to 3.5%, W: equal to or less than 3.5%, Cu: equal to or less than 3.5%, V: 0.01 to 0.08%, Sol.Al: 0.005 to 0.10%, N: equal to or less than 0.05%, and Ta: 0.01 to 0.06%, and the balance Fe with inevitable impurities. 1. A method of producing a martensitic stainless steel comprising:providing a steel comprising in mass %, C: 0.005% to 0.05%, Si: equal to or less than 1.0%, Mn: equal to or less than 2.0%, Cr: 16 to 18%, Ni: 2.5 to 6.5%, Mo: 1.5 to 3.5%, W: equal to or less than 3.5%, Cu: equal to or less than 3.5%, V: 0.01 to 0.08%, Sol.Al: 0.005 to 0.10%, N: equal to or less than 0.05%, and Ta: 0.01 to 0.06%, and the balance Fe with inevitable impurities;hot-working the steel;heating the hot-worked steel to form austenite in the hot-worked steel at a temperature equal to or higher than 800° C. and equal to or lower than 980° C.;quenching and cooling the heated steel at a temperature equal to or lower than 100° C.; andtempering the quenched steel at a temperature equal to or higher than 500° C. and equal to or lower than 700° C.2. The method according to claim 1 , wherein the steel further comprises claim 1 , in mass % claim 1 , Nb: equal to or less than 0.1%.3. The method according to claim 1 , wherein an absorbed energy of the martensitic stainless steel in a Charpy full size test at −20° C. is equal to or higher than 100 J.4. The method according to claim 1 , wherein a 0.2% proof stress of the martensitic stainless steel is equal to or higher ...

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Номер записи: 78
07-01-2016 дата публикации

HOLLOW METAL SCREW AND METHOD OF MAKING

Номер: US20160003281A1
Автор: Hutter, III Charles G.
Принадлежит:

A hollow screw and related process of making is provided, wherein the hollow screw is formed from a generally circular corrosion resistant stainless steel disk cut from flat roll stock. The hollow screw includes a head and an elongated and hollow shaft having a wall thickness between about 0.2 to about 0.7 millimeters extending therefrom and defining a shank portion and a threaded portion having a plurality of threads thereon with a rotational drive mechanism configured to facilitate tightening via the threads. The process involves annealing to soften the stamped hollow screw, followed by thread rolling, and then age hardening the hollow screw. As such, the resultant hollow screw is relatively lightweight, about 50% the mass of a solid core screw made from the same material, with a sufficient thread strength to meet most aerospace applications and contributes to important aircraft fuel economy. 1. A hollow screw , comprising:a head formed from a flat stock of metal material;an elongated and hollow shaft formed from the flat stock of metal material and integrally extending from the head, the elongated and hollow shaft including a shank portion and a threaded portion having a plurality of threads thereon; anda rotational drive mechanism integrally formed from the flat stock of metal material and coupled with the head or the elongated and hollow shaft, and configured to facilitate tightening of the hollow screw by way of the threads.2. The hollow screw of claim 1 , wherein the elongated and hollow shaft comprises a wall thickness between about 0.2 and 0.7 millimeters.3. The hollow screw of claim 1 , including an integral washer formed from the flat stock of metal material and extending outwardly from the head.4. The hollow screw of claim 3 , including a captive washer at least partially formed around the integral washer in a manner permitting free rotation of the captive washer relative to the integral washer claim 3 , the head and the elongated and hollow shaft.5. The ...

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Номер записи: 79
02-01-2020 дата публикации

RAIL AND METHOD FOR PRODUCING SAME

Номер: US20200002780A1
Автор: Hase Kazukuni, Honjo Minoru, Ichimiya Katsuyuki, Kimura Tatsumi
Принадлежит: JFE STEEL CORPORATION

A rail exhibits a high 0.2% proof stress after shipping, which is effective for improving rolling contact fatigue resistance of the rail, the rail having a chemical composition containing C: 0.70% to 0.85%, Si: 0.1% to 1.5%, Mn: 0.4% to 1.5%, P: 0.035% or less, S: 0.010% or less, and Cr: 0.05% to 1.50%, with the balance being Fe and inevitable impurities, and exhibiting, at least 90 days after a preparation date of a steel material inspection certificate of the rail which describes at least a measurement result of a 0.2% proof stress of a head of the rail, an improvement margin of a 0.2% proof stress of 40 MPa or more, relative to the 0.2% proof stress described in the steel material inspection certificate. 1. A rail accompanied by a steel material inspection certificate which describes at least a measurement result of a 0.2% proof stress of a head of the rail , having a chemical composition containing , in mass% ,C: 0.70% to 0.85%,Si: 0.1% to 1.5%,Mn: 0.4% to 1.5%,P: 0.035% or less,S: 0.010% or less, andCr: 0.05% to 1.50%, with the balance being Fe and inevitable impurities,wherein the rail exhibits, at least 90 days after a preparation date of the steel material inspection certificate, an improvement margin of a 0.2% proof stress of 40 MPa or more, relative to the 0.2% proof stress described in the steel material inspection certificate.2. The rail according to claim 1 , wherein the chemical composition further contains claim 1 , in mass% claim 1 , at least one selected from the group consisting ofV: 0.30% or less,Cu: 1.0% or less,Ni: 1.0% or less,Nb: 0.05% or less,Mo: 0.5% or less,Al: 0.07% or less,W: 1.0% or less,B: 0.005% or less, andTi: 0.05% or less.3. A method for producing a rail claim 1 , comprising: C: 0.70% to 0.85%,', 'Si: 0.1% to 1.5%,', 'Mn: 0.4% to 1.5%,', 'P: 0.035% or less,', 'S: 0.010% or less, and', 'Cr: 0.05% to 1.50%, with the balance being Fe and inevitable impurities;, 'hot rolling a steel raw material to obtain a rail, the steel raw material ...

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Номер записи: 80
02-01-2020 дата публикации

FERRITIC STAINLESS STEEL SHEET, HOT COIL, AND AUTOMOBILE EXHAUST FLANGE MEMBER

Номер: US20200002793A1
Автор: NISHIMURA Akihiro, TAMURA Shinichi, TERAOKA Shinichi
Принадлежит: NIPPON STEEL CORPORATION

A ferritic stainless steel plate having a sheet thickness t of 5.0 to 12.0 mm, including a chemical composition consisting of, in mass percent, C: 0.001 to 0.010%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.0%, P: 0.04% or less, S: 0.010% or less, Cr: 10.0 to 20.0%, Ni: 0.01 to 1.0%, Ti: 0.10 to 0.30%, V: 0.01 to 0.40%, Al: 0.005 to 0.3%, N: 0.001 to 0.02%, and as necessary, one or more of B, Mo, Cu, Mg, Sn, Sb, Zr, Ta, Nb, Hf, W, Co, Ca, REM, and Ga, with the balance being Fe and unavoidable impurities, wherein in a steel micro-structure, on a cross section parallel to a rolling direction, an area ratio of structures each satisfying: major grain diameter/minor grain diameter being 5.0 or more is 90% or more, and an average minor grain diameter of the structures is 100 μm or less. The ferritic stainless steel is excellent in toughness and suitable for an automobile exhaust flange member and the like. 1. A ferritic stainless steel sheet having a sheet thickness t of 5.0 to 12.0 mm , comprisinga chemical composition consisting of, in mass percent:C: 0.001 to 0.010%;Si: 0.01 to 1.0%;Mn: 0.01 to 1.0%;P: 0.04% or less;S: 0.010% or less;Cr: 10.0 to 20.0%;Ni: 0.01 to 1.0%;Ti: 0.10 to 0.30%;V: 0.01 to 0.40%;Al: 0.005 to 0.3%;N: 0.001 to 0.02%;B: 0 to 0.0030%;Mo: 0 to 2.0%;Cu: 0 to 0.3%;Mg: 0 to 0.0030%;Sn: 0 to 0.1%;Sb: 0 to 0.1%;Zr: 0 to 0.1%;Ta: 0 to 0.1%;Nb: 0 to 0.1%;Hf: 0 to 0.1%;W: 0 to 0.1%;Co: 0 to 0.2%;Ca: 0 to 0.0030%;REM: 0 to 0.05%; andGa: 0 to 0.1%,with the balance being Fe and unavoidable impurities, whereinin a steel micro-structure, on a cross section parallel to a rolling direction, an area ratio of structures each satisfying: major grain diameter/minor grain diameter being 5.0 or more is 90% or more, and an average minor grain diameter of the structures is 100 μm or less.2. A hot coil made of the ferritic stainless steel sheet according to .3. An automobile exhaust flange member made of the ferritic stainless steel sheet according to .4. An automobile exhaust flange ...

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Номер записи: 81
07-01-2021 дата публикации

METHOD FOR THE HEAT TREATMENT OF A PART MADE FROM MARAGING STEEL

Номер: US20210002737A1
Автор: VERLEENE STEPHANIE
Принадлежит:

A method for the heat treatment of a part made of maraging steel, which part is obtained by selective laser melting, it comprises the steps of: heating the said part made of maraging steel from ambient temperature T0 to a maximum temperature Tmax of between 600° C. and 640° C., maintaining the said maximum temperature Tmax for a duration of between 5 hours and 7 hours, and rapidly cooling the said part. 111.-. (canceled)12. A method for the heat treatment of a part made of maraging steel , which part is obtained by selective laser melting , and which maraging steel comprises a carbon content of less than or equal to 0.03% , a nickel content of between 17% and 19% , a cobalt content of between 8.5% and 9.5% , a molybdenum content of between 4.5% and 5.2% , a titanium content of between 0% and 0.8% , an aluminium content of between 0% and 0.15% , a chromium content of between 0% and 0.5% , a copper content of between 0% and 0.5% , a silicon content of between 0% and 0.1% , a manganese content of between 0% and 0.1% , a sulfur content of between 0% and 0.01% , a phosphorus content of between 0% and 0.01% , the remainder being iron and all percentages being expressed by weight with respect to the total weight of the part , the method comprising the steps of:{'sub': 0', 'max, 'heating the part made of maraging steel from ambient temperature Tto a maximum temperature Tof between 600° C. and 640° C.;'}{'sub': 'max', 'maintaining the maximum temperature Tfor a duration of between 5 hours and 7 hours; and'}cooling the part.13. The method according to claim 12 , wherein the maximum temperature Tis between 610° C. and 630° C.14. The method according to claim 12 , wherein the maximum temperature Tis maintained for a duration of 6 hours or of around 6 hours.15. The method according to claim 12 , wherein a rate of cooling Vis between 420° C./min and 480° C./min.16. The method according to claim 15 , wherein the rate of cooling Vis between 440° C./min and 460° C./min.17. The ...

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Номер записи: 82
07-01-2021 дата публикации

COLD ROLLED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

Номер: US20210002740A1
Автор: ARLAZAROV Artem, PIPARD Jean-Marc
Принадлежит:

A cold rolled heat treated steel sheet having a composition with the following elements, expressed in percentage by weight 0.1%≤Carbon≤0.5%, 1%≤Manganese≤3.4%, 0.5%≤Silicon≤2.5%, 0.03%≤Aluminum≤1.5%, 0%≤Sulfur≤0.003%, 0.002%≤Phosphorus≤0.02%, 0%≤Nitrogen≤0.01% and can contain one or more of the following optional elements 0.05%≤Chromium≤1%, 0.001%≤Molybdenum≤0.5%, 0.001%≤Niobium≤0.1%, 0.001%≤Titanium≤0.1%, 0.01%≤Copper≤2%, 0.01%≤Nickel≤3%, 0.0001%≤Calcium≤0.005%, 0%≤Vanadium≤0.1%, 0%≤Boron≤0.003%, 0%≤Cerium≤0.1%, 0%≤Magnesium≤0.010%, 0%≤Zirconium≤0.010%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet having in area fraction, 10 to 30% Residual Austenite, 50 to 85% Bainite, 1 to 20% Quenched Martensite, and less than 30% Tempered Martensite. 117.-. (canceled)18. A cold rolled heat treated steel sheet having a composition comprising the following elements , expressed in percentage by weight:0.1%≤Carbon≤0.5%1%≤Manganese≤3.4%0.5%≤Silicon≤2.5%0.03%≤Aluminum≤1.5%0%≤Sulfur≤0.003%.0.002%≤Phosphorus≤0.02%0%≤Nitrogen≤0.01%and optionally containing one or more of the following elements0.05%≤Chromium≤1%0.001%≤Molybdenum≤0.5%0.001%≤Niobium≤0.1%0.001%≤Titanium≤0.1%0.01%≤Copper≤2%0.01%≤Nickel≤3%0.0001%≤Calcium≤0.005%0%≤Vanadium≤0.1%0%≤Boron≤0.003%0%≤Cerium 0.1%0%≤Magnesium≤0.010%0%≤Zirconium≤0.010%a remainder being iron and unavoidable impurities caused by processing;a microstructure of the cold rolled heat treated steel sheet comprising in area fraction, 10 to 30% Residual Austenite, 50 to 85% Bainite, 1 to 20% Quenched Martensite, and less than 30% Tempered Martensite.19. The cold rolled heat treated steel as recited in wherein the composition includes 0.7% to 2.4% of Silicon.20. The cold rolled heat treated steel as recited in wherein the composition includes 0.03% to 0.9% of Aluminum.21. The cold rolled heat treated steel as recited in wherein the composition includes 0.03% to 0.6% of ...

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Номер записи: 83
07-01-2021 дата публикации

High-strength steel sheet with excellent ductility and hole-expandability

Номер: US20210002741A1
Автор: Akihiro Uenishi, Koutarou Hayashi, Shohei Yabu
Принадлежит: Nippon Steel Corp

A steel sheet including, in mass %, C: 0.05% or more and 0.30% or less, Si: 0.05% or more and 6.00% or less, Mn: 1.50% or more and 10.00% or less, and the balance: Fe and impurities, a steel sheet structure is composed of, in area ratio, 15% or more and 80% or less of ferrite and 20% or more and 85% or less in total of a hard structure composed of any one of bainite, martensite, or retained austenite, or any combination thereof, and to a steel sheet thickness t, an area ratio of a maximum coupled ferrite region in a region from a t/2 position at the steel sheet thickness center to a position at a depth of 3t/8 from a surface is 80% or more in area ratio to a total ferrite area, and a two-dimensional isoperimetric constant of the maximum coupled ferrite region is 0.35 or less.

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Номер записи: 84
03-01-2019 дата публикации

METHOD AND SYSTEM FOR LASER HARDENING OF A SURFACE OF A WORKPIECE

Номер: US20190002997A1
Автор: DOMÍNGUEZ Jesús, GABILONDO Amaia, OCAÑA José Luis, SORIANO Carlos
Принадлежит:

A method of laser hardening of a surface area of a workpiece, such as a surface of a journal of a crankshaft, including the steps of generating a relative movement between the surface of the workpiece and a laser source to allow a laser spot to subsequently be projected onto different portions of the surface area, and during the relative movement, repetitively scanning the laser beam so as to produce a two-dimensional equivalent effective laser spot on the surface area. The energy distribution of the effective laser spot is adapted so that it is different in a more heat sensitive subarea, such as in an area adjacent to an oil lubrication opening, than in a less heat sensitive subarea, so as to prevent overheating of the more heat sensitive subarea. 1. An apparatus for hardening a surface area of a workpiece , the surface area comprising at least one less heat sensitive subarea and at least one more heat sensitive subarea , the apparatus comprising a laser source arranged to project an effective laser spot onto the surface area and means for generating relative movement between said surface area and the effective laser spot so that said effective laser spot is moved along said surface area so as to subsequently and progressively heat different portions of said surface area to a temperature suitable for hardening , whereby said effective laser spot is arranged to feature a two-dimensional energy distribution , the apparatus further comprising a control system for controlling operation of the apparatus , wherein said control system is arranged to modify said two-dimensional energy distribution so that it is different in said more heat sensitive subarea than in said less heat sensitive subarea.2. The apparatus according to claim 1 , wherein said at least one more heat sensitive subarea includesan area adjacent to a hole in the surface area, such as an oil lubrication hole; and/ora fillet, such as an undercut fillet; and/ora previously hardened portion of the surface ...

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Номер записи: 85
03-01-2019 дата публикации

Low Alloy Steels with Enhanced Toughness and Fatigue Strength at High Hardness

Номер: US20190002998A1
Автор: Cryderman Robert L.
Принадлежит:

Methods of forming low alloy steels and steels produced by such methods are provided. Various alloy additions and elements, as well as heating and tempering times and method steps are provided herein. Methods and materials of the present disclosure provide for enhanced fatigue at high hardness as compared with more brittle conventional steels. 1. A method of forming a steel alloy , comprising:providing a carbon steel with between approximately 0.40 and approximately 0.60 carbon by weight percent;adding at least one of manganese, nickel, molybdenum, and tungsten as an alloy addition wherein the at least one alloy addition comprises not more than approximately 2.2 weight percent of the combined carbon steel and the alloy addition;austenitizing the carbon steel and the at least one alloy addition for between 1500 seconds and 2000 seconds at 900 degrees Celsius and at 1150 degrees Celsius;quenching the carbon steel and the at least one alloy addition in the presence of helium;tempering the carbon steel and the at least one alloy addition at a temperature between approximately 150 degrees Celsius and 250 degrees Celsius;performing a further austenitizing step comprising at least one of induction heating and direct-resistance heating; andquenching and tempering the carbon steel and the at least one alloy addition at between approximately 150 degrees Celsius and 250 degrees Celsius.2. The method of claim 1 , wherein the at least one of induction heating and direct-resistance heating comprises providing the carbon steel and the at least one alloy addition at 850 degrees Celsius for 2 seconds claim 1 , at 950 degrees Celsius for 10 seconds claim 1 , and 1050 degrees Celsius for 1000 seconds.3. The method of claim 1 , wherein the step of quenching and tempering the carbon steel and the at least one alloy addition is performed at a temperature of approximately 200 degrees Celsius.4. The method of claim 1 , wherein at least one of the austenitizing steps is performed with a ...

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Номер записи: 86
03-01-2019 дата публикации

Bolt

Номер: US20190003000A1
Автор: Hideo Kanisawa, Kazuoki SHIBUYA, Kazutaka Aoyama, Keisuke Chiba, Makoto Kosaka, Naoki Matsui, Ryoko Inagaki, Tetsushi Chida, Yutaka Neishi
Принадлежит: Aoyama Seisakusho Co Ltd, Nippon Steel and Sumitomo Metal Corp

A bolt is provided that has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to an embodiment of the present invention consists of, in mass %, C: 0.32 to 0.39%, Si: 0.15% or less, Mn: 0.40 to 0.65%, P: 0.020% or less, S: 0.020% or less, Cr: 0.85 to 1.25%, Al: 0.005 to 0.060%, Ti: 0.010 to 0.050%, B: 0.0010 to 0.0030%, N: 0.0015 to 0.0080%, 0: 0.0015% or less, Mo: 0 to 0.05%, V: 0 to 0.05%, Cu: 0 to 0.50%, Ni: 0 to 0.30%, and Nb: 0 to 0.05%, with the balance being Fe and impurities. The bolt satisfies Formula (1) and Formula (2), and has a tensile strength of 1000 to 1300 MPa and satisfies Formula (3). 4.9≤10C+Si+2Mn+Cr+4Mo+5V≤6.1   (1) Mn/Cr≤0.55   (2) [dissolved Cr]/Cr≥0.70   (3)

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Номер записи: 87
03-01-2019 дата публикации

ULTRA-HIGH STRENGTH STEEL SHEET HAVING EXCELLENT PHOSPHATABILITY AND BENDABILITY AND METHOD FOR MANUFACTURING SAME

Номер: US20190003002A1
Автор: SEO Seok-Jong
Принадлежит:

Provided is an ultra-high strength steel sheet having excellent phosphatability and bendability. The ultra-high strength steel sheet includes, by weight percentage (wt %), carbon (C): 0.08% to 0.2%, silicon (Si): 0.05% to 1.3%, manganese (Mn): 2.0% to 3.0%, phosphorus (P): 0.001% to 0.10%, sulfur (S): 0.010% or less, aluminum (Al): 0.01% to 0.1%, chromium (Cr): 0.3% to 1.2%, boron (B): 0.0010% to 0.0030%, titanium (Ti): 0.01% to 0.05%, nitrogen (N): 0.001% to 0.01%, a remainder of iron (Fe) and other inevitable impurities, satisfying: 3.4≤Ti/N≤10, 1.0≤Mn/(Si+Cr), and 0.7≤Mn*/(Si*+Cr*)≤Mn/(Si+Cr), where Ti, N, Mn, Si and Cr refer to a weight percentage (wt %), and Mn*, Si* and Cr* refer to an average of values obtained by GDS component analysis from a surface to a 0.1 μm position in a thickness direction. 1. An ultra-high strength steel sheet having excellent phosphatability and bendability , comprising , by weight percentage (wt %) , carbon (C): 0.08% to 0.2% , silicon (Si): 0.05% to 1.3% , manganese (Mn): 2.0% to 3.0% , phosphorus (P): 0.001% to 0.10% , sulfur (S): 0.010% or less , aluminum (Al): 0.01% to 0.1% , chromium (Cr): 0.3% to 1.2% , boron (B): 0.0010% to 0.0030% , titanium (Ti): 0.01% to 0.05% , nitrogen (N): 0.001% to 0.01% , a remainder of iron (Fe) and other inevitable impurities ,wherein Ti and N satisfy Relationship 1,wherein Mn, Si and Cr satisfy Relationship 2, [{'br': None, '3.4≤Ti/N≤10 \u2003\u2003[Relationship 1]'}, {'br': None, '1.0≤Mn/(Si+Cr) \u2003\u2003[Relationship 2]'}, {'br': None, '0.7≤Mn*/(Si*+Cr*)≤Mn/(Si+Cr) \u2003\u2003[Relationship 3]'}], 'wherein amounts of Mn, Si and Cr in a surface layer, ranging from a surface to a 0.1 pm position in a thickness direction, satisfy Relationship 3wherein each of Ti, N, Mn, Si and Cr in Relationships 1 to 3 refers to a weight percentage (wt %) of the element, and each of Mn*, Si* and Cr* in Relationship 3 refers to an average of values obtained by GDS component analysis from a surface to a 0.1 pm ...

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Номер записи: 88
03-01-2019 дата публикации

Retention Of Mechanical Properties In Steel Alloys After Processing And In The Presence Of Stress Concentration Sites

Номер: US20190003003A1
Автор: ANDERSON Scott T., BALL Andrew T., BRANAGAN Daniel James, Cheng Sheng, Clark Kurtis R., FRERICHS Andrew E., GIDDENS Taylor L., JUSTICE Grant G., Larish Scott T., MEACHAM Brian E., SERGUEEVA Alla V., TEW Logan J., WALLESER Jason K.
Принадлежит: THE NANOSTEEL COMPANY, INC.

This invention is related to retention of mechanical properties in high strength steel at reduced thicknesses and which mechanical property performance is also retained at relatively high strain rates. These new steels can offer advantages for a myriad of applications where reduced sheet thickness is desirable. In addition, the alloys herein are those that retain useful mechanical properties after introduction of a geometric discontinuity and an accompanying stress concentration. 1. A method to retain mechanical properties in a metallic sheet alloy at reduced thickness comprising:a. supplying a metal alloy comprising at least 70 atomic % iron and at least four or more elements selected from Si, Mn, Cr, Ni, Cu, or C, melting said alloy, cooling at a rate of <250 K/s, and solidifying to a thickness of 25.0 mm up to 500 mm;{'sub': 1', '1', '1', '1, 'b. processing said alloy into sheet form with thickness Twith the sheet having a total elongation of X(%), an ultimate tensile strength of Y(MPa), and a yield strength of Z(MPa);'}{'sub': 2', '1', '2', '1', '2', '1', '2', '1, 'c. further processing said alloy into a second sheet with reduction in thickness T Подробнее

Номер записи: 89
03-01-2019 дата публикации

Vehicle part having high strength and excellent durability, and manufacturing method therefor

Номер: US20190003004A1
Автор: Hwan-Goo Seong, Ki-Hyun Park, Yeol-Rae Cho, Youn-Il CHUNG
Принадлежит: Posco Co Ltd

Provided are a part for vehicle having high strength and excellent durability, and a manufacturing method therefor. The part for vehicle comprises, by a weight ratio, a composition comprising 0.20-0.50% of C, 0.5% or less of Si, 1.0-2.0% of Mn, 0.01-0.1% of Al, 0.010% or less of P, 0.003% or less of S, 0.01-0.1% of Ti, 0.05-0.5% of Cr, 0.05-0.3% of Mo, 0.01% or less of N, and the remainder being Fe and other inevitable impurities, and the part for vehicle can have, by an area ratio, a microstructure comprising 90% or more of tempered martensite, 4% or less of retained austenite, and the remainder being one type or both of two types selected from among the ferrite and bainite structures.

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Номер записи: 90
03-01-2019 дата публикации

Method for Producing a Steel Sheet Having Improved Strength, Ductility and Formability

Номер: US20190003005A1
Автор: JUN Hyun Jo, VENKATASURYA Pavan
Принадлежит:

A method for producing a steel sheet is provided. The steel sheet has a microstructure including, in area fraction, 20% to 50% intercritical ferrite, 10% to 20% retained austenite, 25% to 45% tempered martensite, 10% to 20% fresh martensite, and bainite. The sum of tempered martensite and bainite is between 30% and 60%. The method includes providing a cold-rolled steel sheet including, in weight percent, 0.18%≤C≤0.25%, 0.9%≤Si≤1.8%, 0.02%≤Al≤1.0%, with 1.00%≤Si+Al≤2.35%, 1.5%≤Mn 2.5%, 0.010%≤Nb≤0.035%, 0.10%≤Cr≤0.40%, and a remainder including Fe and unavoidable impurities. The method further includes annealing the steel sheet to obtain 50% to 80% austenite and 20% to 50% of ferrite, quenching the sheet at a cooling rate between 20° C./s and 50° C./s to a quenching temperature between Ms-50° C. and Ms-5° C., heating the sheet to a partitioning temperature between 375° C. and 450° C. and maintaining the sheet at the partitioning temperature for at least 50 s, then immediately cooling the sheet to room temperature. A steel sheet is also provided. 121-. (canceled)23. The method according to claim 22 , wherein the steel sheet has claim 22 , just after quenching a structure consisting of claim 22 , in area fraction claim 22 , at least 20% austenite claim 22 , between 30% and 60% martensite claim 22 , and between 20% and 50% ferrite.24. The method according to claim 22 , wherein the chemical composition of the steel includes 1.25%≤Si+Al≤2.35%.25. The method according to claim 22 , further comprising a step of:hot dip coating the steel sheet between the step of maintaining the steel sheet at the partitioning temperature PT and the step of cooling the steel sheet down to the room temperature.26. The method according to claim 25 , wherein the partitioning temperature PT is between 400° C. and 430° C.27. The method according to claim 25 , wherein the partitioning time Pt is between 50 s and 150 s.28. The method according to claim 25 , wherein the hot dip coating step is a ...

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Номер записи: 91
03-01-2019 дата публикации

Mn-CONTAINING GALVANNEALED STEEL SHEET AND METHOD FOR PRODUCING THE SAME

Номер: US20190003006A1
Автор: Kawasaki Yoshiyasu, Maeda Satoshi, Makimizu Yoichi, Suzuki Yoshitsugu, Yamada Katsumi
Принадлежит: JFE STEEL CORPORATION

High-strength galvannealed steel sheet including any of a) an oxide containing Fe and Mn, b) an oxide containing Fe and Mn and an Fe oxide, c) an oxide containing Fe and Mn and a Mn oxide, d) an oxide containing Fe and Mn, an Fe oxide, and a Mn oxide, and e) an Fe oxide and a Mn oxide is present in a zinc coated layer. The total amount of oxide is 0.01 to 0.100 g/m; the ratio by mass % of Mn to Fe, e.g., Mn/Fe, contained in the oxide is 0.10 to 10.00; an oxide of at least one selected from Fe and Mn is present in an amount of 60% or more; and an oxide of at least one selected from Fe and Mn is present in a surface layer portion of a steel sheet in an amount of 0.040 g/mor less (not including zero). 1. A Mn-containing galvannealed steel sheet , comprising a steel sheet containing , on a mass % basis:C: 0.03% to 0.35%;Si: 0.01% to 2.00%;Mn: 3.0% to 8.0%;Al: 0.001% to 1.000%;P: 0.10% or less; and{'sup': '2', 'claim-text': 'wherein the zinc coated layer contains any one of a) to e) described below,', 'S: 0.01% or less, the balance being Fe and incidental impurities, the steel sheet having a zinc coated layer on one or both surfaces thereof with a coating weight of 20 to 120 g/m,'}a) an oxide containing Fe and Mn,b) an oxide containing Fe and Mn and an Fe oxide,c) an oxide containing Fe and Mn and a Mn oxide,d) an oxide containing Fe and Mn, an Fe oxide, and a Mn oxide, and [{'sup': '2', 'a total amount of the oxide is 0.01 to 0.100 g/min terms of an amount of O, a ratio by mass % of Mn to Fe, i.e., Mn/Fe, contained in the oxide is 0.10 to 10.00,'}, 'the oxide of at least one selected from Fe and Mn is present in an amount of 60% or more in terms of a cross-sectional area fraction in a range from a surface of the zinc coated layer to a position 50% or less of a total thickness of the zinc coated layer, and', {'sup': '2', 'an oxide of at least one selected from Fe and Mn is present in a surface layer portion of the steel sheet in an amount of 0.040 g/mor less (not ...

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Номер записи: 92
03-01-2019 дата публикации

Method for Producing a High Strength Steel Sheet Having Improved Strength and Formability, and Obtained High Strength Steel Sheet

Номер: US20190003007A1
Автор: JUN Hyun Jo, VENKATASURYA Pavan
Принадлежит:

A method for producing a steel sheet having a microstructure including 71% to 91% martensite and bainite, 9% to 13% retained austenite, and at most 20% ferrite is provided. The method includes providing a cold-rolled steel sheet including, in weight percent: 0.13%≤C≤0.22%, 1.2%≤Si≤2.3%, 0.02%≤Al≤1.0%, with 1.25%≤Si+Al≤2.35%, 2.4%≤Mn≤3%, Ti≤0.05%, Nb≤0.05% and a remainder of Fe and unavoidable impurities, annealing the steel sheet to obtain 80% to 100% austenite and 0% to 20% ferrite, quenching the steel sheet at a cooling rate between 20° C./s and 50° C./s to a quenching temperature between 240° C. and 310° C., heating the steel sheet to a partitioning temperature between 400° C. and 465° C. and maintaining the steel sheet at the partitioning temperature for 50 to 250 seconds, then immediately cooling the sheet to room temperature. Steel sheets are also provided. 117to . (canceled)18. A method for producing a steel sheet having a microstructure consisting of between 71% and 91% of a sum of martensite and bainite , between 9% and 13% retained austenite , and at most 20% ferrite , the method comprising the following successive steps: 0.13%≤C≤0.22%,', '1.2%≤Si≤2.3%,', '0.02%≤Al≤1.0%,', 'with 1.25%≤Si+Al≤2.35%,', '2.4%≤Mn≤3%,', 'Ti≤0.05%', 'Nb≤0.05%, and, 'providing a cold-rolled steel sheet, made of a steel having a chemical composition containing by weighta remainder, the remainder including Fe and unavoidable impurities;{'sub': 'A', 'annealing the steel sheet at an annealing temperature Tso as to obtain a structure comprising from 80% to 100% austenite and from 0% to 20% ferrite;'}quenching the steel sheet at a cooling rate between 20° C./s and 50° C./s down to a quenching temperature QT between 240° C. and 270° C.;heating the steel sheet up to a partitioning temperature PT between 440° C. and 460° ;maintaining the steel sheet at the partitioning temperature PT for a partitioning time Pt between 50 s and 250 s; andimmediately after the maintaining step, cooling the ...

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Номер записи: 93
03-01-2019 дата публикации

Method For Producing a High Strength Steel Sheet Having Improved Ductility and Formability, and Obtained Steel Sheet

Номер: US20190003008A1
Автор: GOSPODINOVA Maya, Hebert Veronique, VENKATASURYA Pavan
Принадлежит: ArcelorMittal

A method for producing a steel sheet is provided. The method includes providing a cold-rolled steel sheet including in weight %: 0.15%≤C≤0.23%, 1.4%≤Mn≤2.6%, 0.6%≤Si≤1.5%, 0.02%≤Al≤1.0%, with 1.0%≤Si+Al≤2.0%, 0≤Nb≤0.035%, 0≤Mo≤0.3%, 0≤Cr≤0.3%, and a remainder of Fe and unavoidable impurities, annealing the steel sheet at an annealing temperature between Ac1 and Ac3 to obtaining at least 40% austenite and at least 40% intercritical ferrite, quenching the sheet from at least 600° C. at a cooling rate of at least 20° C./s to a quenching temperature between 180° C. and 260° C., heating the sheet to a partitioning temperature between 375° C. and 470° C. and maintaining the sheet at this partitioning temperature for a partitioning time Pt between 25 s and 440 s, then cooling the sheet to room temperature. A steel sheet is also provided. 133-. (canceled)34. A method for producing a steel sheet having a tensile strength of at least 980 MPa , a total elongation of at least 16% , and a hole expansion ratio HER of at least 20% ,the method for producing the steel sheet comprising the successive steps of: 0.15%≤C≤0.23%,', '1.4%≤Mn≤2.6%,', '0.6%≤Si≤1.5%,', '0.02%≤Al≤1.0%,', 'with 1.0%≤Si+Al≤2.0%,', '0≤Nb≤0.035%,', '0≤Mo≤0.3%,', '0≤Cr≤0.3%,', 'Ni<0.05%,', 'Cu<0.03%,', 'V<0.007%,', 'B<0.0010%,', 'S<0.005%,', 'P<0.02%,', 'N<0.010%, and, 'providing a cold-rolled steel sheet, made of a steel having a chemical composition including by weighta remainder, the remainder including Fe and unavoidable impurities;annealing the steel sheet at an annealing temperature TA between Ac1 and Ac3 to obtain a structure including at least 40% austenite and at least 40% intercritical ferrite;quenching the steel sheet from a temperature of at least 600° C., at a cooling rate of at least 20° C./s, down to a quenching temperature QT between 180° C. and 260° C.;heating the steel sheet up to a partitioning temperature PT between 375° C. and 470° C.;maintaining the steel sheet at the partitioning temperature ...

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Номер записи: 94
03-01-2019 дата публикации

High-strength steel sheet and high-strength galvanized steel sheet

Номер: US20190003009A1
Автор: Hiroyuki Kawata, Kohei Ueda, Naoki Maruyama, Satoshi Uchida, Takayuki Kitazawa, Yuji Yamaguchi
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A high-strength steel sheet includes: a specific chemical composition; and a microstructure represented by, in a ⅛ thickness to ⅜ thickness range with ¼ thickness of a sheet thickness from a surface being a center, in volume fraction, ferrite: 85% or less, bainite: 3% or more and 95% or less, tempered martensite: 1% or more and 80% or less, retained austenite: 1% or more and 25% or less, pearlite and coarse cementite: 5% or less in total, and fresh martensite: 5% or less, in which the solid-solution carbon content in the retained austenite is 0.70 to 1.30 mass %, and to all grain boundaries of retained austenite grains having an aspect ratio of 2.50 or less and a circle-equivalent diameter of 0.80 μm or more, the proportion of interfaces with the tempered martensite or the fresh martensite is 75% or less.

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Номер записи: 95
03-01-2019 дата публикации

HOT WORK TOOL STEEL

Номер: US20190003021A1
Автор: Andersson Jerker, EJNERMARK Sebastian, Medvedeva Anna, Nilsson Cherin, ROBERTSSON Rikard
Принадлежит:

The invention relates hot work tool steel. The steel comprises the following main components (in wt. %): 5. A steel according claim 1 , wherein the content of primary precipitated MX is 0.2-3 vol. % claim 1 , preferably 0.3-1.0 vol. %.8. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 6 vol. %.9. A steel according to claim 1 , wherein the steel is provided in the form of a powder claim 1 , preferably having a size distribution in the range of 5-150 μm claim 1 , wherein the mean size of the powder particles is in the range of 25-50 μm.10. Use of a steel powder according to for additive manufacturing claim 9 , in particular for making of repairing injection moulding tools.11. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 5 vol. %.12. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 4 vol. %.13. A steel according to claim 1 , wherein the matrix comprises tempered martensite and/or bainite and the amount of retained austenite is limited to 2 vol. %.14. A steel according to claim 1 , wherein the steel is provided in the form of a powder claim 1 , having a size distribution in the range of 10-100 μm claim 1 , wherein the mean size of the powder particles is in the range of 25-50 μm.15. A steel according to claim 1 , wherein the steel is provided in the form of a powder claim 1 , having a size distribution in the range of 10-60 μm claim 1 , wherein the mean size of the powder particles is in the range of 25-50 μm. The invention relates to a hot work tool steel.Vanadium alloyed matrix tool steels have been on market for decades and attained a considerable interest because of the fact that they combine a high wear resistance with an excellent dimensional stability and because they have ...

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Номер записи: 96
03-01-2019 дата публикации

STEEL, A WELDING CONSUMABLE, A CAST, FORGED OR WROUGHT PRODUCT, A METHOD OF WELDING, A WELDED PRODUCT AND A METHOD OF HEAT TREATING

Номер: US20190003023A1
Автор: Birks Steven Charles, Goodwin Bernard Rafe Ernest, Goodwin Richard Stanley, Roberts Stephen
Принадлежит:

A steel including, in mass %: 0.005 to 0.015% carbon; 0.05 to 0.35% silicon, 7.45 to 8.4% nickel; 1.00%> or less manganese; 0.025%> or less sulphur; 0.030%> or less phosphorous; 24.0 to 26.0% chromium; 0.50 to 1.00% copper; 3.0 to 4.0% C molybdenum; 0.002 to 0.010% niobium; 0.75% or less cobalt; 0.015% or less aluminium; 0.20 to 0.30% nitrogen; 0.50 to 0.85%) tungsten; the balance being iron and incidental impurities. 1. A steel including , in mass %: 0.005 to 0.015% carbon; 0.05 to 0.35% silicon , 7.45 to 8.4% nickel; 1.00% or less manganese; 0.025% or less sulphur; 0.030% or less phosphorous; 24.0 to 26.0% chromium; 0.50 to 1.00% copper; 3.0 to 4.0% molybdenum; 0.010% or less niobium; 0.75% or less cobalt; 0.015% or less aluminium; 0.20 to 0.30% nitrogen; 0.50 to 0.85% tungsten; the balance being iron and incidental impurities.2. The steel of claim 1 , including 7.5% or more nickel claim 1 , preferably 7.8% or more nickel claim 1 , most preferably 8.00% or more nickel.3. (canceled)4. (canceled)5. The steel of claim 1 , including 0.005 to 0.0145% carbon.6. The steel of claim 1 , including 0.05 to 0.30% silicon claim 1 , preferably 0.05 to 0.25% silicon claim 1 , most preferably 0.10 to 0.25% silicon.7. The steel of claim 1 , including 0.002% or more niobium.8. (canceled)9. The steel of claim 1 , including 0.010% or less sulphur.10. The steel of claim 1 , including 0.64 to 0.84% tungsten claim 1 , preferably 0.66% to 0.84% tungsten.11. The steel of claim 1 , including 0.010% or less aluminium.12. The steel of claim 1 , wherein a volume fraction of sigma phase in the steel is less than 0.25% claim 1 , preferably less than 0.1% claim 1 , most preferably no detectable sigma phase as measured under ASTM A923 2014.13. The steel of claim 1 , wherein the steel is a steel in accordance with ASTM A995-13 Gr 6A claim 1 , 1 Dec. 2013.14. The steel of claim 1 , wherein an average impact strength at ½ T is 100 J or more and a minimum of three tests of 80 J or more as measured by ...

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Номер записи: 97
13-01-2022 дата публикации

HIGH-YIELD-RATIO COLD-ROLLED DUAL-PHASE STEEL AND MANUFACTURING METHOD THERFOR

Номер: US20220010394A1
Автор: Li Wei, XUE Peng, Zhu Xiaodong
Принадлежит: BAOSHAN IRON & STEEL CO., LTD.

Disclosed is a high-yield-ratio cold-rolled dual-phase steel, having the following chemical elements in percentage by mass: 0.05%-0.08% of C, 0.9%-1.2% of Mn, 0.1%-0.6% of Si, 0.030%4060% of Nb, 0.030%-0.060% of Ti, 0.015%-0.045% of Al, and the balance being Fe and other inevitable impurities. A manufacturing method for the high-yield-ratio cold-rolled dual-phase steel, comprising: (1) smelting and casting; (2) hot rolling, wherein a casting blank is controlled and soaked at a temperature of 1200° C.-1250° C.; rolled with the finish rolling temperature being 840° C.-930° C.; cooled at a speed of 20° C./s-70° C./s, and then wound at the winding temperature being 570° C.-630° C.; (3) cold rolling; (4) annealing at the soaking temperature being 750° C.-790° C. for 40 s-200 s, cooling at a speed of 30° C./s-80° C./s, the start temperature of cooling is 650° C. to 730° C., the aging temperature is 200° C. to 260° C., and the overaging time is 100 s to 400 s; and (5) leveling. 1. A cold-rolled dual-phase steel having a high yield ratio , comprising the following chemical elements in mass percentages:C: 0.05-0.08%, Mn: 0.9-1.2%, Si: 0.1-0.6%, Nb: 0.030-0.060%, Ti: 0.030-0.060%, Al: 0.015-0.045%, and a balance of Fe and other unavoidable impurities.2. The cold-rolled dual-phase steel having a high yield ratio according to claim 1 , wherein the steel has a microstructure which is a complex phase structure of martensite+ferrite+[NbxTiy(C claim 1 ,N)z] carbonitride.3. The cold-rolled dual-phase steel having a high yield ratio according to claim 2 , wherein the martensite has a phase proportion of 20-30% claim 2 , and the martensite is in the shape of long strips-islands.4. The cold-rolled dual-phase steel having a high yield ratio according to claim 2 , wherein the [NbxTiy(C claim 2 ,N)z] carbonitride has an irregular spherical shape and is uniformly distributed in ferrite grains claim 2 , and the [NbxTiy(C claim 2 ,N)z] carbonitride has a phase proportion of 5-10%.5. The cold ...

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Номер записи: 98
13-01-2022 дата публикации

METHOD OF MANUFACTURING NON-ORIENTED ELECTRICAL STEEL SHEET

Номер: US20220010400A1
Автор: Oda Yoshihiko, Okubo Tomoyuki, UESAKA Masanori, Zaizen Yoshiaki
Принадлежит: JFE STEEL CORPORATION

To stably improve the magnetic flux density by utilizing induction heating and radiant heating during final annealing of a non-oriented electrical steel sheet. A method of manufacturing a non-oriented electrical steel sheet, including subjecting a slab having a predetermined chemical composition to hot rolling with or without performing hot-rolled sheet annealing, and then to cold rolling either once, or twice or more with intermediate annealing performed therebetween, and then to final annealing, where a material before final cold rolling has a recrystallization ratio of less than 80% and a {100}<011> intensity of 8 or less in a ¼ layer, and in the final annealing, an average heating rate from 600° C. to 720° C. is 50° C./s or higher, and an average heating rate from 720° C. to 760° C. is 5° C./s or higher. 1. A method of manufacturing a non-oriented electrical steel sheet , comprising:subjecting a slab, which has a chemical composition containing, in mass %, C: 0.0050% or less, P: 0.2% or less, Si: 4.0% or less, Mn: 3.0% or less, Al: 2.0% or less, S: 0.0050% or less, N: 0.0050% or less, O: 0.010% or less, Ti: 0.0030% or less and Nb: 0.0010% or less, with the balance being Fe and inevitable impurities, to hot rolling with or without performing hot-rolled sheet annealing, and then to cold rolling either once, or twice or more with intermediate annealing performed therebetween, and then to final annealing, whereina material before final cold rolling has a recrystallization ratio of less than 80% and a {100}<011> intensity of 8 or less in a ¼ layer, andin the final annealing, an average heating rate from 600° C. to 720° C. is 50° C./s or higher, and an average heating rate from 720° C. to 760° C. is 5° C./s or higher.2. The method of manufacturing a non-oriented electrical steel sheet according to claim 1 , wherein the slab has a ratio of γ phase of 30% or more at a slab heating temperature claim 1 , and reverse rolling is performed at least once during rough rolling ...

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Номер записи: 99
13-01-2022 дата публикации

Roughly-shaped steel material for nitrided part, and nitrided part

Номер: US20220010416A1
Автор: Hiroaki Tahira, Kison NISHIHARA, Masato Yuya, Satoru Okawa
Принадлежит: Nippon Steel Corp

Provided are a roughly-shaped steel material for a nitrided part, and a nitrided part obtained by nitriding the roughly-shaped steel material for a nitrided part, having a determined chemical composition, in which the portion with a diameter or width ranging from 60 to 130 mm of the roughly-shaped steel material for a nitrided part has a microstructure at a depth of 14.5 mm from a surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 70 to 100%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite; and has a microstructure at a depth of 15 mm or more from the surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 0 to less than 50%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite.

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Номер записи: 100