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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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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 24579. Отображено 100.
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: 1
26-01-2012 дата публикации

Process for manufacturing a cold rolled trip steel product

Номер: US20120018058A1
Автор: Bruno De Cooman, Joachim Antonissen, Liesbeth Barbe, Lucia Tosal-Martinez, Marijke De Meyer, Serge Claessens, Sigrid Jacobs, Sven Vandeputte
Принадлежит: Arcelor France SA

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

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Номер записи: 2
09-02-2012 дата публикации

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

Номер: US20120031528A1
Автор: Koichi Goto, Kunio Hayashi, Naoki Matsutani, Nobuhiro Fujita, Toshimasa Tomokiyo
Принадлежит: Individual

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

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Номер записи: 3
03-05-2012 дата публикации

High strength steel sheet and method for manufacturing the same

Номер: US20120107633A1
Автор: Katsumi Nakajima, Katsumi Yamada, Kazuhiro Seto, Koichi Nakagawa, Satoshi Kinoshiro, Takeshi Yokota, Tetsuya Mega, Yuji Tanaka
Принадлежит: JFE Steel Corp

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

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Номер записи: 4
07-06-2012 дата публикации

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

Номер: US20120138197A1
Автор: Kazuhiro Seto, Masahide Watabe, Noriaki Kohsaka, Reiko Sugihara, Yasushi Tanaka
Принадлежит: JFE Steel Corp

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

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Номер записи: 5
28-06-2012 дата публикации

Method and device for producing a microalloyed steel, in particular a pipe steel

Номер: US20120160377A1
Автор: Joachim Ohlert, Juergen Seidel
Принадлежит: Sms Siemag AG

The invention relates to a method of making microalloyed steel, in particular a pipe steel, wherein a cast slab ( 1 ) passes through an installation ( 2 ) having a casting machine ( 3 ), a first furnace ( 4 ), at least one roughing roll stand ( 5 ), a second furnace ( 6 ), at least one finishing roll stand ( 7 ), and a cooling line ( 8 ) in this order in the travel direction (F) of the slab ( 1 ). The method comprises: a) definition of a desired temperature profile for the slab ( 1 ) over its travel through the installation ( 2 ); positioning in the process line (L) of the installation ( 2 ) at least one temperature-influencing element ( 9, 10 ) for setting the temperature of the slab ( 1 ) according to the defined temperature profile, the temperature-influencing element ( 9, 10 ) being introduced between the first furnace ( 4 ) and the roughing roll stand ( 5 ), and/or between the second furnace ( 6 ) and the finishing roll stand ( 7 ); production of the slab ( 1 ) in the installation ( 2 ) configured in this manner, the temperature-influencing element ( 9, 10 ) being operated in such a way that the defined temperature profile is at least substantially maintained. The invention further relates to an installation for making microalloyed steel.

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Номер записи: 6
26-07-2012 дата публикации

Methods of forming molybdenum sputtering targets

Номер: US20120189483A1
Автор: Brad Lemon, David G. Schwarz, David Meendering, Gary Rozak, James G. Daily, III, Jerome O'Grady, Joseph Hirt, Peter R. Jepson, Prabhat Kumar, Richard Wu, Steven A. Miller, Timothy Welling
Принадлежит: Individual

In various embodiments, tubular sputtering targets are produced by forming a tubular billet at least by pressing molybdenum powder in a mold and sintering the pressed molybdenum powder, working the tubular billet to form a worked billet, and heat treating the worked billet.

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Номер записи: 7
03-01-2013 дата публикации

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

Номер: US20130000791A1
Автор: Junji Haji, Osamu Kawano, Yuzo Takahashi
Принадлежит: Individual

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

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Номер записи: 8
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: 9
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: 10
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: 11
25-04-2013 дата публикации

Ni-ADDED STEEL PLATE AND METHOD OF MANUFACTURING THE SAME

Номер: US20130098514A1
Автор: Furuya Hitoshi, Inoue Takehiro, Okushima Motohiro, Saitoh Naoki, TAKAHASHI Yasunori, Uemori Ryuji
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A Ni-added steel plate contains, by mass %, C: 0.03% to 0.10%, Si: 0.02% to 0.40%, Mn: 0.3% to 1.2%, Ni: 5.0% to 7.5%, Cr: 0.4% to 1.5%, Mo: 0.02% to 0.4%, Al: 0.01% to 0.08%, T•O: 0.0001% to 0.0050%, P: limited to 0.0100% or less, S: limited to 0.0035% or less, and N: limited to 0.0070% or less with a remainder composed of Fe and inevitable impurities, in which a Ni segregation ratio at a position of ¼ of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of austenite after deep cooling is 2% or more, an austenite unevenness index after deep cooling is 5.0 or less, and an average equivalent circle diameter of austenite after deep cooling is 1 μm or less. 1. A Ni-added steel plate comprising , by mass %:C: 0.03% to 0.10%;Si: 0.02% to 0.40%;Mn: 0.3% to 1.2%;Ni: 5.0% to 7.5%;Cr: 0.4% to 1.5%;Mo: 0.02% to 0.4%;Al: 0.01% to 0.08%;T•O: 0.0001% to 0.0050%;P: limited to 0.0100% or less;S: limited to 0.0035% or less;N: limited to 0.0070% or less; andthe balance consisting of iron and unavoidable impurities,wherein a Ni segregation ratio based on mass % at a position of ¼ of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of an austenite after a deep cooling is 2% or more, an austenite unevenness index after the deep cooling is 5.0 or less, and an average equivalent circle diameter of the austenite after the deep cooling is 1 μm or less,wherein the austenite unevenness index after the deep cooling is a value obtained by dividing a maximum area fraction by a minimum area fraction, in which, among data which are evaluated such that an evaluation of an area fraction of the austenite is carried out with each viewing areas thereof being defined as a 5×5 μm area and is continuously carried out in the thickness direction with being centered on the position of ¼ of the plate thickness away from the plate surface in the thickness direction, an average of the data of 5 largest area fractions ...

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Номер записи: 12
25-04-2013 дата публикации

MULTI-PHASE HOT-ROLLED STEEL SHEET HAVING IMPROVED DYNAMIC STRENGTH AND A METHOD FOR ITS MANUFACTURE

Номер: US20130098515A1
Автор: Kawano Kaori, Tanaka Yasuaki, Tomida Toshiro
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A multi-phase hot-rolled steel sheet having improved strength in an intermediate strain rate region has a chemical composition comprising, in mass percent, C: 0.07-0.2%, Si+Al: 0.3-1.5%, Mn: 1.0-3.0%, P: at most 0.02%, S: at most 0.005%, Cr: 0.1-0.5%, N: 0.001-0.008%, at least one of Ti: 0.002-0.05% and Nb: 0.002-0.05%, and a remainder of Fe and impurities. The area fraction of ferrite is 7-35%, the grain diameter of ferrite is in the range of 0.5-3.0 μm, and the nanohardness of ferrite is in the range of 3.5-4.5 GPa. A second phase which is the remainder other than ferrite contains martensite and bainitic ferrite and/or bainite. The average nanohardness of the second phase is 5-12 GPa, and the second phase contains a high-hardness phase of 8-12 GPa with an area fraction of 5-35% based on the overall structure. 1. A multi-phase hot-rolled steel sheet characterized by: C: at least 0.07% and at most 0.2%,', 'Si+Al: at least 0.3% and at most 1.5%,', 'Mn: at least 1.0% and at most 3.0%,', 'P: at most 0.02%', 'S: at most 0.005%,', 'Cr: at least 0.1% and at most 0.5%,', 'N: at least 0.001% and at most 0.008%,', 'one or two of Ti: at least 0.002% and at most 0.05% and Nb: at least 0.002% and at most 0.05%, and', 'a remainder of Fe and impurities,, 'having a chemical composition comprising, in mass percent,'}having ferrite with an area fraction at least 7% and at most 35%, the ferrite having a grain diameter of at least 0.5 μm and at most 3.0 μm and a nanohardness of at least 3.5 GPa and at most 4.5 GPa, andhaving a second phase which is the remainder other than ferrite, the second phase including martensite and at least one selected from bainitic ferrite and bainite and having an average nanohardness of at least 5 GPa and at most 12 GPa, the second phase containing a high-hardness phase of at least 8 GPa and at most 12 GPa with an area fraction of at least 5% and at most 35% with respect to the overall structure.2. A multi-phase hot-rolled steel sheet as set forth in ...

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Номер записи: 13
16-05-2013 дата публикации

METHOD OF PRODUCING AN AUSTENITIC STEEL

Номер: US20130118647A1
Автор: Berkhout Basjan, Cornelissen Marcus Cornelis Maria, Patel Jayesh Ramjibhai
Принадлежит: TATA STEEL IJMUIDEN BV

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

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Номер записи: 14
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: 15
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: 16
30-05-2013 дата публикации

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

Номер: US20130133790A1
Автор: Ariga Tamako, Mega Tetsuya, Nakajima Katsumi
Принадлежит: JFE STEEL CORPORATION

Described is a high tensile strength hot rolled steel sheet having high strength and formability, and a manufacturing method. It has tensile strength≧980 MPa and excellent formability, and specifically identified ranges by mass % of C, Si, Mn, P, S, N, Al, Ti, V, Solute V, and Solute Ti; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter<10 nm, as well as volume ratio with respect to the entire microstructure≧0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure≧97%. C, Ti, V, S and N satisfy (1) Ti≧0.08+(N/14×48+S/32×48) and (2) 0.8≦(Ti/48+V/51)/(C/12)≦1.2, where “C”, “Ti”, “V”, “S” and “N” represent contents (mass %) of corresponding elements, respectively. 1. A high tensile strength hot rolled steel sheet having tensile strength of at least 980 MPa and excellent formability , comprising: C: 0.07% to 0.13% (inclusive of 0.07% and 0.13%),', 'Si: 0.3% or less,', 'Mn: 0.5% to 2.0% (inclusive of 0.5% and 2.0%),', 'P: 0.025% or less,', 'S: 0.005% or less,', 'N: 0.0060% or less,', 'Al: 0.06% or less,', 'Ti: 0.08% to 0.14% (inclusive of 0.08% and 0.14%),', 'V: 0.15% to 0.30% (inclusive of 0.15% and 0.30%),', 'Solute V: 0.04% to 0.1% (inclusive of 0.04% and 0.1%),', 'Solute Ti: 0.05% or less, and', 'remainder consisting of Fe and incidental impurities;, 'a composition including by mass %,'}microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter of less than 10 nm, as well as volume ratio with respect to the entire microstructure of at least 0.007; and [{'br': None, 'Ti≧0.08+(N/14×48+S/32×48)\u2003\u2003(1)'}, {'br': None, '0.8≦(Ti/48+V/51)/(C/12)≦1.2\u2003\u2003(2)'}], 'matrix as ferrite phase having area ratio with respect to the entire microstructure of at least 97%, wherein contents of C, Ti, V, S and N satisfy formula (1) and formula (2) ...

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Номер записи: 17
27-06-2013 дата публикации

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

Номер: US20130160904A1
Автор: Funakawa Yoshimasa, Moriyasu Noriaki, Murata Takayuki, Nakajima Katsumi, Saito Hayato
Принадлежит:

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

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Номер записи: 18
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: 19
11-07-2013 дата публикации

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

Номер: US20130174940A1
Автор: Abbruzzese Giuseppe, Cicale Stefano, Claret Ribeiro Silva Ronaldo, Da Cunha Marco Antonio, De Araujo Quintao Helcio, De Faria Fonseca Angelo Jose
Принадлежит:

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

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Номер записи: 20
18-07-2013 дата публикации

ELECTRICAL STEEL PROCESSING WITHOUT A POST COLD-ROLLING INTERMEDIATE ANNEAL

Номер: US20130183192A1
Автор: Gallo Eric E., Hill Theodore E.
Принадлежит: NUCOR CORPORATION

Embodiments of the present invention comprises melting scrap steel into molten steel; decarburizing the molten steel and adding alloys; transferring the steel to ladles and casting the steel into slabs; hot rolling the slabs into sheets; pickling the sheets; annealing the sheets; cold rolling the sheets; and performing one or more of tension leveling, a rough rolling, or a coating process on the sheets after cold rolling, without an intermediate annealing process between the cold rolling and the tension leveling, the rough rolling, or the coating process. The sheet is sent to the customer for stamping and customer annealing. The new process provides an electrical steel with the similar, same, or better magnetic properties than an electrical steel manufactured using the traditional processing with an intermediate annealing step after cold rolling. 1. A method of manufacturing an electrical steel , comprising:hot rolling steel into a steel sheet in one or more hot rolling passes;annealing the steel sheet after hot rolling;cold rolling the steel sheet in one or more cold rolling passes after the annealing; andwherein the steel sheet is stamped and customer annealed by a customer, without an intermediate annealing process after the cold rolling, and before the stamping and the customer annealing.2. The method of claim 1 , further comprising:preforming one or more of a tension leveling, a coating, or a rough rolling process on the steel sheet after the cold rolling and before the stamping and the customer annealing.3. The method of claim 1 , wherein the composition of the electrical steel comprises:silicon (Si) in a range of 0.15-3.5% weight;aluminum (Al) in a range of 0.15-1% weight;manganese (Mn) in a range of 0.005-1% weight;carbon (C) less than or equal to 0.04% weight;antimony (Sb) or tin (Sn) less than or equal to 0.1% weight; andwherein the remainder of the composition of the electrical steel comprises unavoidable impurities and iron.4. The method of claim 1 , ...

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Номер записи: 21
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: 22
08-08-2013 дата публикации

Method for manufacturing hot stamped body having vertical wall and hot stamped body having vertical wall

Номер: US20130199676A1
Автор: Kunio Hayashi, Toshimasa Tomokiyo, Toshimitsu Aso
Принадлежит: Individual

The present invention provides a method for manufacturing a hot stamped body having a vertical wall, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac 1 ° C. and lower than Ac 3 ° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.

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Номер записи: 23
29-08-2013 дата публикации

STEEL PLATE FOR PIPELINE, HAVING EXCELLENT HYDROGEN INDUCED CRACK RESISTANCE, AND PREPARATION METHOD THEREOF

Номер: US20130224063A1
Автор: Kim Kyu-Tae, Lee Myung-Jin, Park Kyu-Heop
Принадлежит: HYUNDAI STEEL COMPANY

Disclosed are a steel plate for a line pipe having excellent hydrogen induced crack resistance with a tensile strength of 450 MPa or more, and a preparation method thereof. According to the present invention, the steel plate for a line pipe, having excellent hydrogen induced crack resistance comprises: 0.03-0.05 wt % of carbon (C); 0.2-0.3 wt % of silicon (Si); 0.5-1.3 wt % of manganese (Mn); 0.010 wt % or less of phosphorus (P); 0.005 wt % or less of sulfur (S); 0.02-0.05 wt % of aluminum (Al); 0.2-0.5 wt % of nickel (Ni); 0.2-0.3 wt % of chromium (Cr); 0.03-0.05 wt % of niobium (Nb); 0.02-0.05 wt % of vanadium (V); 0.01-0.02 wt % of titanium (Ti); 0.001-0.004 wt % of calcium (Ca); and a balance of iron (Fe) and inevitable impurities, and has a tensile strength of 450 MPa or more. 1. A steel plate comprising:carbon (C), 0.03˜0.05 wt %; silicon (Si), 0.2˜0.3 wt %; manganese (Mn), 0.5˜1.3 wt %; phosphorous (P), 0.010 wt % or less; sulfur (S), 0.005 wt % or less; aluminum (Al), 0.02˜0.05 wt %; nickel (Ni), 0.2˜0.5 wt %; chromium (Cr), 0.2˜0.3 wt %; niobium (Nb), 0.03˜0.05 wt %; vanadium (V), 0.02˜0.05 wt %; titanium (Ti), 0.01˜0.02 wt %; calcium (Ca), 0.001˜0.004 wt %; and the balance of iron (Fe) and other unavoidable impurities,the steel plate having a tensile strength of 450 MPa or more.2. The steel plate according to claim 1 , wherein the steel plate has a yield ratio (yield strength/tensile strength) of 80% or less.3. The steel plate according to claim 1 , wherein microstructure of the steel plate is a composite structure including acicular ferrite and bainite structures.4. The steel plate according to claim 3 , wherein the composite structure including acicular ferrite and bainite structures occupies 30% or more of the entirety of the microstructure in terms of cross-sectional area ratio.5. The steel plate according to claim 4 , wherein a composite structure including ferrite and pearlite structures occupies 70% or less of the entirety of the microstructure in ...

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Номер записи: 24
19-09-2013 дата публикации

High strength galvanized steel sheet having excellent formability and method for manufacturing the same

Номер: US20130244056A1
Автор: Hidetaka Kawabe, Kazuhiro Seto, Kenji Kawamura
Принадлежит: JFE Steel Corp

A high strength galvanized steel sheet having excellent formability, includes a steel sheet which is a base sheet and a galvanized layer on a surface of the steel sheet, wherein the steel sheet is a high strength steel sheet which has a composition including, by mass %, 0.08 to 0.15% of C, 0.5 to 1.5% of Si, 0.5 to 1.5% of Mn, 0.1% or less of P, 0.01% or less of S, 0.01 to 0.1% of Al, 0.005% or less of N, and the balance Fe with inevitable impurities, and a microstructure composed of 75 to 90% of a ferrite phase as a main phase and 10 to 25% of a second phase including at least pearlite in terms of an area fraction with respect to the entire microstructure; an average grain size of the pearlite is 5 μm or smaller; and the pearlite has an area fraction of 70% or greater with respect to the total area of the second phase.

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Номер записи: 25
26-09-2013 дата публикации

Steel sheet for bottom covers of aerosol cans and method for producing same

Номер: US20130248054A1
Автор: Hirokazu Yokoya, Jyunichi Matsunaga, Keiichiro Torisu, Seiichi Tanaka
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A steel sheet for bottom covers of aerosol cans includes, as chemical composition, C: 0.025 to 0.065mass %, Mn: 0.10 to 0.28mass %, P: 0.005 to 0.03mass %, Al: 0.01 to 0.04mass %, N: 0.0075 to 0.013mass %, Si: limited to 0.05mass % or less, S: limited to 0.009mass % or less, and balance consisting of Fe and unavoidable impurities, wherein yield point YP in rolling direction after aging treatment is in range of 460 to 540 MPa, total elongation in the rolling direction after the aging treatment is 15% or more, yield point elongation EL YP in the rolling direction after the aging treatment is 6% or less, and sheet thickness t in unit of mm, the yield point YP in unit of MPa in the rolling direction after the aging treatment, and the yield point elongation EL YP in unit of % in the rolling direction after the aging treatment satisfy 130≦t×YP×(1−EL YP /100).

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Номер записи: 26
17-10-2013 дата публикации

HOT-ROLLED, COLD ROLLED, AND PLATED STEEL SHEET HAVING IMPROVED UNIFORM AND LOCAL DUCTILITY AT A HIGH STRAIN RATE

Номер: US20130269838A1
Автор: Kawano Kaori, Tanaka Yasuaki, Tomida Toshiro
Принадлежит: NIPPON STEEL & SUMITOMO METAL CORPORATION

A multi-phase hot-rolled steel sheet has a metallurgical structure having a main phase of ferrite with an average grain diameter of at most 3.0 μm and a second phase including at least one of martensite, bainite, and austenite. In the surface layer, the average grain diameter of the second phase is at most 2.0 μm, the difference (ΔnH) between the average nanohardness of the main phase (nH) and the average nanohardness of the second phase (nH) is 6.0-10.0 GPa, the difference (ΔσnH) of the standard deviation of the nanohardness of the second phase from the standard deviation of the nanohardness of the main phase is at most 1.5 GPa, and in the central portion, the difference (ΔnH) between the average nanohardnesses is at least 3.5 GPa to at most 6.0 GPa and the difference (ΔσnH) between the standard deviations of the nanohardnesses is at least 1.5 GPa. 1. A hot-rolled steel sheet having improved uniform ductility and local ductility at a high strain rate which comprises a main phase of ferrite having an average grain diameter of at most 3.0 μm and a second phase including at least one of martensite , bainite , and austenite , characterized in that{'sub': av', 'αav', '2nd av, 'in a surface layer of the steel sheet which is a region between the surface of the steel sheet and a location at a depth of 100 μm from the surface, the second phase has an average grain diameter of at most 2.0 μm, the difference (ΔnH) between the average nanohardness of ferrite (nH) which is the main phase and the average nanohardness of the second phase (nH) is at least 6.0 GPa to at most 10.0 GPa, and the difference (ΔσnH) of the standard deviation of the nanohardness of the second phase from the standard deviation of the nanohardness of the ferrite is at most 1.5 GPa, and'}{'sub': 'av', 'in a central portion of the steel sheet which is a region from a location at a depth of ¼ of the sheet thickness from the surface of the steel sheet to the center of the sheet thickness, the above-described ...

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Номер записи: 27
17-10-2013 дата публикации

Hot-dip galvanized steel sheet and manufacturing method thereof

Номер: US20130273392A1
Автор: Nobuhiro Fujita, Toshiki Nonaka, Toshio Ogawa
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A hot-dip galvanized steel sheet includes a steel sheet and a hot-dip galvanized layer arranged on the steel sheet, in which the Si content and the Al content by mass % of components of the steel sheet satisfy a relationship 0.5<Si+Al<1.0, and a metallographic structure of the steel sheet satisfies a relationship of {(n 2 ) 2/3 ×d 2 }/{(n 1 ) 2/3 ×d 1 }×ln(H 2 /H 1 )<0.3 when the n 1 is the number of a MnS of a surface portion of the steel sheet, the d 1 μm is an average equivalent circle diameter of the MnS in the surface portion of the steel sheet, the H 1 GPa is a hardness of a martensite of the surface portion of the steel sheet, the n 2 is the number of the MnS of a center portion of the steel sheet, the d 2 μm is an average equivalent circle diameter of the MnS in the center portion of the steel sheet, and the H 2 GPa is the hardness of the martensite of the center portion of the steel sheet.

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Номер записи: 28
09-01-2014 дата публикации

Method for Producing a Hot-Rolled Flat Steel Product

Номер: US20140007992A1
Автор: Evgeny BALICHEV, Harald Hofmann, Jian Bian
Принадлежит: THYSSENKRUPP STEEL EUROPE AG

A method for generating a flat steel product comprising the steps of: melting a steel melt, comprising, in addition to Fe and unavoidable impurities (in wt %) C: 0.5-1.3%, Mn: 18-26%, Al: 5.9-11.5%, Si: <1%, Cr: <8%, Ni: <3%, Mo: <2%, N: <0.1%, B: <0.1%, Cu: <5%, Nb: <1%, Ti: <1%, V: <1%, Ca: <0.05%, Zr: <0.1%, P: <0.04%, S: <0.04%; casting the steel melt into a cast strip; heating the cast strip to an initial hot-rolling temperature of 1100-1300° C. at a heating rate of at least 20 K/s; hot rolling the cast strip into a hot strip; cooling the hot strip within 10 seconds after the hot rolling at a cooling rate of at least 100 K/s to <400° C.; and winding the cooled hot strip into a coil at a coiling temperature of up to 400° C.

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Номер записи: 29
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: 30
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: 31
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: 32
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: 33
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: 34
06-01-2022 дата публикации

WELDED STEEL SHEETS, AND SHEETS THUS PRODUCED

Номер: US20220002833A1
Автор: CELOTTO Thierry, CHICHARRO HERRANZ Francisco, DECHASSEY Emmanuel, DUPUY Thomas, KACZYNSKI Christine, NGO Quang-Tien, POLO MESTRE Vicente, SILVY-LELIGOIS Christophe, THEYSSIER Marie-Christine
Принадлежит:

A steel sheet that is welded and then cold rolled to a thickness between 0.5 mm and 3 mm, the deformation ratio created by cold rolling in the base metal is equal to ε, for which the deformation ratio created by the cold rolling in the welded joint is equal to ε, where: 2. The steel sheet as recited in wherein the steel sheet has a tensile strength Rm greater than 600 MPa.3. The steel sheet as recited in wherein a composition of the base metal includes claim 1 , as contents expressed as weight percent:0.05%≤C≤0.17%;1.1%≤Mn≤2.76%;0.07%≤Si≤0.7%;S≤0.008%;P≤0.030%;0.015%≤Al≤0.61%;Mo≤0.13%;Cr≤0.55%;Cu<0.2%;Ni≤0.2%;Nb≤0.050%;Ti≤0.045%;V≤0.010%;B≤0.005%;Ca<0.030%; andN≤0.007%,a remainder being iron and unavoidable impurities due to processing.4. The steel sheet as recited in wherein the steel sheet has a tensile strength Rm greater than 690 MPa.5. The steel sheet as recited in wherein a composition of the base metal includes claim 4 , the contents being expressed as weight percent:0.13%≤C≤0.3%;1.8%≤Mn≤3.5%;0.1%≤Si≤2%;0.1%≤Al≤2%;1%≤S1+Al≤2.5%; andN≤0.010%;a remainder being iron and unavoidable impurities due to processing.6. The steel sheet as recited in wherein the composition of the base metal includes claim 5 , the contents being expressed as weight percent:Ni+Cr+Mo<1%;Ti≤0.1%;Nb≤0.1%; andV≤0.1%.7. The steel sheet as recited in wherein the steel sheet is suitable for press-hardening for the manufacture of parts having tensile strength Rm greater than 1000 MPa.8. The steel sheet as recited in wherein the composition of the base metal includes claim 7 , the contents being expressed as weight percent:0.15%≤C≤0.5%;0.4%≤Mn≤3%;0.1≤Si≤1%;Cr≤1%;Ti≤0.2%;Al≤0.1%; andB≤0.010%;a remainder being iron and unavoidable impurities due to processing.9. The steel sheet as recited in wherein the composition of the base metal includes at least one of claim 8 , the contents being expressed as weight percent:0.25%≤Nb≤2%; andNb≤0.060%.10. The steel sheet as recited in wherein the base metal is ...

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Номер записи: 35
06-01-2022 дата публикации

LOW-YIELD-RATIO ULTRA-HIGH-STRENGTH HIGH-TOUGHNESS STEEL FOR PRESSURE HULLS AND PREPARATION METHOD THEREFOR

Номер: US20220002849A1
Автор: KAN Liye, Tian Yong, WANG Qinghai, Wang Yimin, WANG Zhaodong, YE Qibin, ZHOU Cheng
Принадлежит:

The present invention discloses a low-yield-ratio ultra-high-strength high-toughness steel for pressure hulls and a preparation method therefor, wherein the chemical components by weight percentage are: 0.05%-0.10% of C, 0.15%-0.35% of Si, 0.60%-1.00% of Mn, 0.10%-0.50% of Cu, 0.10%-1.00% of Mo, 0.40%-0.70% of Cr, 0.05%-0.15% of V, 5.00%-10.00% of Ni, and the balance of Fe and unavoidable impurities. The technical solution of the present invention adopts secondary quenching heat treatment, the first quenching is performed to achieve complete austenitizing, and then the second quenching and tempering are performed to finally obtain complex phase structures such as tempered martensite, critical ferrite and retained austenite, so as to meet the performance index requirements of low yield ratio, ultra-high strength and high toughness, and thereby promoting application in practice. 1. A preparation method for a low-yield-ratio ultra-high-strength high-toughness steel for pressure hulls , comprising the following steps:step 1, meltingmelting to obtain a casting blank using the following chemical components by weight percentage: 0.05%-0.10% of C, 0.15%-0.35% of Si, 0.60%-1.00% of Mn, 0.10%-0.50% of Cu, 0.10%-1.00% of Mo, 0.40%-0.70% of Cr, 0.05%-0.15% of V, 5.00%-10.00% of Ni, and the balance of Fe and unavoidable impurities.step 2, hot rollingkeeping the casting blank obtained in step 1 at 1150° C.-1220° C. for soaking, and then performing hot rolling; the hot rolling adopts a two-stage rolling process; the rolling temperature of the first stage is 1150° C.-1000° C., and the reduction is ≥50%; the rolling temperature of the second stage is 900° C.-750° C., and the reduction is ≥50%; the final rolling thickness is 5-80 mm; and air cooling a high-temperature steel plate after the hot rolling to room temperature;step 3, heat treatmentheating a sample of the hot-rolled steel plate in step 2 to 790° C.-810° C., soaking for 20-40 minutes, and water quenching to room temperature ...

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Номер записи: 36
07-01-2016 дата публикации

HOT-ROLLED STEEL SHEET HAVING EXCELLENT DRAWABILITY AND POST-PROCESSING SURFACE HARDNESS

Номер: US20160002745A1
Автор: KAJIHARA Katsura
Принадлежит:

The present invention intends a hot-rolled steel sheet with a sheet thickness in a range of 2 to 15 mm, having component composition including C: 0.3% or less by mass %, Si: 0.5% or less, Mn: in a range of 0.2 to 1%, P: 0.05% or less, S: 0.05% or less, Al: in a range of 0.01 to 0.1%, N: in a range of 0.008 to 0.025%, and the remainder being iron and unavoidable impurities. The hot-rolled steel sheet includes an amount of solute N: not less than 0.007%, and ferrite grains existing at a position of t/4 in depth (t: the sheet thickness) includes the ferrite grains, a sheet plane orientation thereof, within 10° from the (123) plane, having an area ratio: not less than 20%, the ferrite grains, a sheet plane orientation thereof, within 10° from the (111) plane, having an area ratio: not less than 5%, and the ferrite grains, a sheet plane orientation thereof, within 10° from the (001) plane, having an area ratio: 20% or less, the average grain size of the ferrite grains existing at the position of t/4 in depth being in a range of 3 to 35 μm. 1. A steel sheet with a sheet thickness in a range of 2 to 15 mm comprising:C: >0 to 0.3 mass;Si: >0 to 0.5 mass %;Mn: in a range of 0.2 to 1 mass %;P: >0 to 0.05 mass %;S: >0 to 0.05 mass %;Al: in a range of 0.01 to 0.1 mass %;N: in a range of 0.008 to 0.025 mass %,solute N: in an amount not less than 0.007 mass %; andthe remainder being iron and unavoidable impurities.2. The hot rolled steel sheet according to claim 1 , further comprising at least one element selected from at least one of groups (a) to (e):(a) at least one element selected from the group consisting of >0 to 2 mass % of Cr and >0 to 2 mass % of Mo,(b) at least one element selected from the group consisting of Ti: >0 to 0.2 mass %, Nb: >0 to 0.2 mass %, and V: >0 to 0.2 mass %,(c) B: >0 to 0.005 mass %,(d) at least one element selected from the group consisting of Cu: >0 to 5%, Ni: >0 to 5 mass %, and Co: >0 to 5 mass %, and(e) at least one element selected from the ...

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Номер записи: 37
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: 38
05-01-2017 дата публикации

ULTRAHIGH-STRENGTH STEEL FOR WELDING STRUCTURE WITH EXCELLENT TOUGHNESS IN WELDING HEAT-AFFECTED ZONES THEREOF, AND METHOD FOR MANUFACTURING SAME

Номер: US20170002435A1
Автор: JEONG Hong-Chul, KIM Ho-Soo
Принадлежит:

Provided is a ultrahigh strength steel for a welded structure having superior toughness in a weld heat-affected zone (HAZ) comprising: by wt %, carbon (C): 0.05% to 0.15%, silicon (Si): 0.1% to 0.6%, manganese (Mn): 1.5% to 3.0%, nickel (Ni): 0.1% to 0.5%, molybdenum (Mo): 0.1% to 0.5%, chromium (Cr): 0.1% to 1.0%, copper (Cu): 0.1% to 0.4%, titanium (Ti): 0.005% to 0.1%, niobium (Nb): 0.01% to 0.03%, boron (B): 0.0003% to 0.004%, aluminum (Al): 0.005% to 0.1%, nitrogen (N): 0.001% to 0.006%, phosphorus (P): 0.015% or less, sulfur (S): 0.015% or less, iron (Fe) as a residual component thereof, and inevitable impurities. 1. A ultrahigh strength steel for a welded structure having superior toughness in a weld heat-affected zone (HAZ) comprising:by wt %, carbon (C): 0.05% to 0.15%, silicon (Si): 0.1% to 0.6%, manganese (Mn): 1.5% to 3.0%, nickel (Ni): 0.1% to 0.5%, molybdenum (Mo): 0.1% to 0.5%, chromium (Cr): 0.1% to 1.0%, copper (Cu): 0.1% to 0.4%, titanium (Ti): 0.005% to 0.1%, niobium (Nb): 0.01% to 0.03%, boron (B): 0.0003% to 0.004%, aluminum (Al): 0.005% to 0.1%, nitrogen (N): 0.001% to 0.006%, phosphorus (P): 0.015% or less, sulfur (S): 0.015% or less, iron (Fe) as a residual component thereof, and inevitable impurities,wherein the Ti and N component contents satisfy Formula 1 below, the N and B component contents satisfy Formula 2 below, and the Mn, Cr, Mo, Ni, and Nb component contents satisfy Formula 3 below; and [{'br': None, '3.5≦Ti/N≦7.0 \u2003\u2003[Formula 1]'}, {'br': None, '1.5≦N/B≦4.0 \u2003\u2003[Formula 2]'}, {'br': None, '4.0 2≦Mn+Cr+Mo+Ni+3Nb≦7.0 \u2003\u2003[Formula 3]'}], 'a microstructure including, by area fraction, acicular ferrite in an amount of 30% to 40% and bainite in an amount of 60% to 70%,'}wherein in the Formulas 1 to 3, respective component units are wt %.2. The ultrahigh strength steel for a welded structure having superior toughness in a weld HAZ of claim 1 , wherein the steel further comprises claim 1 , by wt % claim 1 , one or ...

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Номер записи: 39
05-01-2017 дата публикации

FERRITIC LIGHTWEIGHT STEEL SHEET HAVING EXCELLENT STRENGTH AND DUCTILITY AND METHOD FOR MANUFACTURING THE SAME

Номер: US20170002436A1
Автор: Kim Han Soo, KIM Nack Joon, KOO Min Seo, SON Chang Young, ZARGARAN Alireza
Принадлежит:

A ferritic steel sheet according to an exemplary embodiment of the present invention includes C at 0.01 to 0.3 wt %, Mn at 0.5 to 8 wt %, Al at 5 to 12 wt %, and Nb at 0.015 to 0.2 wt % based on an entire composition of 100 wt %, and a remaining part of Fe and an impurity. 1. A ferritic steel sheet including C at 0.01 to 0.3 wt % , Mn at 0.5 to 8 wt % , Al at 5 to 12 wt % , and Nb at 0.015 to 0.2 wt % based on an entire composition of 100 wt % , and a remaining part of Fe and an impurity ,wherein an average grain size of a ferrite crystal existing in the steel sheet is 30 μm or less.2. The ferritic steel sheet of claim 1 , wherein:the average grain size of the ferrite crystal is 15 μm or less.3. The ferritic steel sheet of claim 1 , wherein:the ferritic steel sheet includes Si at 0.04 to 2.0 wt %, Cr at 2.0 wt % or less (0% is not included), Mo at 1.0 wt % or less (0% is not included), Ni at 1.0 wt % or less (0% is not included), Ti at 0.1 wt % or less (0% is not included), V at 0.2 wt % or less (0% is not included), B at 0.01 wt % or less (0% is not included), Zr at 0.2 wt % or less (0% is not included), or a combination thereof based on the entire composition of 100 wt %.4. The ferritic steel sheet of claim 1 , wherein:a κ-carbide of a spherical shape, an oval shape, an acicular shape, or a band shape existing inside the ferritic steel sheet is included.5. The ferritic steel sheet of claim 4 , wherein:the κ-carbide at 1 to 10 vol % is included based on the entire 100 vol % of the steel sheet.6. The ferritic steel sheet of claim 4 , wherein:a particle size of the κ-carbide is in a range of 20 nm to 10 μm, and{'sup': 3', '6', '2, 'the κ-carbide is present in the range of 5×10to 1×10particles per unit area (mm).'}7. The ferritic steel sheet of claim 1 , wherein:a NbC compound existing inside the ferritic steel sheet is included.8. The ferritic steel sheet of claim 7 , wherein:the NbC compound at 0.1 to 1 vol % is included based on the entire 100 vol % of the steel ...

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Номер записи: 40
05-01-2017 дата публикации

TITANIUM-FREE ALLOY

Номер: US20170002437A1
Автор: KLOEWER Jutta, ROSENBERG Julia
Принадлежит: VDM Metals International GmbH

Titanium-free alloy which has great resistance to pitting and crevice corrosion and a high yield point in the strain-hardened state and includes (in wt %) a maximum of 0.02% C, a maximum of 0.01% S, a maximum of 0.03% N, 20.0-23.0% Cr, 39.0-44.0% Ni, 0.4-<1.0% Mn, 0.1-<0.5% Si, >4.0-<7.0% Mo, a maximum of 0.15% Nb, >1.5-<2.5% Cu, 0.05-<0.3% Al, a maximum of 0.5% Co, 0.001-<0.005% B, 0.005-<0.015% Mg, the remainder consisting of Fe and smelting-related impurities. 4: Alloy according to claim 1 , which if necessary contains (in wt %) V>0-1.0% claim 1 , especially 0.2-0.7%.5: Process for the manufacture of an alloy that has a composition according to claim 1 , whereina) the alloy is melted openly in continuous or ingot casting,b) to eliminate the segregations caused by the increased molybdenum content, a homogenizing annealing of the produced blooms/billets is performed at 1150-1250° C. for 15 to 25 h, whereinc) the homogenizing annealing is performed in particular following a first hot forming.6: Use of the alloy according to as a structural part in the oil and gas industry.7: Use according to claim 6 , wherein the structural parts exist in the production forms sheet claim 6 , strip claim 6 , pipe (longitudinally welded and seamless) claim 6 , bar or as forging. The invention relates to a titanium-free alloy with high pitting and crevice corrosion resistance as well as high offset yield strength and tensile strength in the cold-worked condition.The high-corrosion-resistant material Alloy 825 is used for critical applications in the chemical industry and in the offshore technology. It is marketed under the material number 2.4858 and has the following chemical composition: C≦0.025%, S≦0.015%, Cr 19.5-23.5%, Ni 28-46%, Mn≦1%, Si≦0.5%, Mo 2.5-3.5%, Ti 0.6-1.2%, Cu 1.5-3%, Al≦0.2%, Co≦1%, Fe the rest.For new applications in the oil and gas industry, the pitting and crevice corrosion resistance (problem 1) as well as the offset yield strength and tensile strength (problem 2 ...

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Номер записи: 41
04-01-2018 дата публикации

METHOD, FURNACE INSTALLATION AND SYSTEM FOR THE HOT STAMPING OF WORKPIECES

Номер: US20180002774A1
Автор: Meyer Wilhelm, Vervoort Peter
Принадлежит:

A system for the hot stamping of workpieces having a furnace installation, in which workpieces can be heated to a forming temperature, and a forming installation, in which the heated workpieces can undergo forming. A transfer device is provided for transferring workpieces from the furnace installation to the forming installation. The transfer device is arranged in a transfer space, which is delimited at least in certain regions by a housing and largely bridges the space between the furnace installation and the forming installation. Also provided is a method for the hot stamping of workpieces. 2. The system as claimed in claim 1 , wherein the housing comprises an access via which one or more workpieces can be introduced into the transfer space.3. The system as claimed in claim 2 , wherein the access is designed as an access lock claim 2 , by means of which the atmosphere of the transfer space remains separated from the surrounding atmosphere.4. The system as claimed in claim 1 , wherein a temperature lock region is formed between the furnace installation and the transfer device.5. The system as claimed in claim 4 , wherein the temperature lock region comprises a flow device claim 4 , by means of which a fluid flow curtain can be produced in front of the furnace installation.6. The system as claimed in claim 1 , wherein the housing comprises an outlet claim 1 , via which a workpiece removed from the furnace installation can be transferred to the forming installation and which can be closed or opened by means of a gate unit.7. The system as claimed in claim 1 , wherein the transfer device is designed as an articulated-arm robot.8. The system as claimed in claim 1 , wherein the transfer device is designed as a suspended system.9. The system as claimed in claim 1 , wherein one or more filler bodies are accommodated in the transfer space. The invention relates to a system for the hot stamping of workpieces, havingMoreover, the invention relates to a method for hot ...

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Номер записи: 42
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: 43
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: 44
02-01-2020 дата публикации

HOT-ROLLED FERRITIC STAINLESS STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Номер: US20200002779A1
Автор: Fujisawa Mitsuyuki, Yoshino Masataka
Принадлежит: JFE STEEL CORPORATION

Provided is a hot-rolled ferritic stainless steel sheet which has sufficient corrosion resistance and which can prevent the occurrence of cracking when subjected to blanking to be formed into a thick flange, and also provided is a method for manufacturing the hot-rolled ferritic stainless steel sheet. A hot-rolled ferritic stainless steel sheet having a chemical composition containing, in mass %, C: 0.001 to 0.020%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.001 to 0.50%, N: 0.001 to 0.020%, Cr: 11.0 to 24.0%, Ni: 0.01 to 2.00%, and Nb: 0.12 to 0.80%, with the balance being Fe and incidental impurities, wherein the hot-rolled ferritic stainless steel sheet has a threshold stress intensity factor Kof 25 MPa·mor more. 1. A hot-rolled ferritic stainless steel sheet having a chemical composition comprising , in mass % ,C: 0.001 to 0.020%,Si: 0.05 to 1.00%,Mn: 0.05 to 1.00%,P: 0.04% or less,S: 0.01% or less,Al: 0.001 to 0.50%,N: 0.001 to 0.020%,Cr: 11.0 to 24.0%,Ni: 0.01 to 2.00%, andNb: 0.12 to 0.80%, with a balance of Fe and incidental impurities,{'sub': 'IC', 'sup': '1/2', 'wherein the hot-rolled ferritic stainless steel sheet has a threshold stress intensity factor Kof 25 MPa·mor more.'}2. A hot-rolled ferritic stainless steel sheet having a chemical composition comprising , in mass % ,C: 0.001 to 0.020%,Si: 0.05 to 1.00%,Mn: 0.05 to 1.00%,P: 0.04% or less,S: 0.01% or less,Al: 0.001 to 0.50%,N: 0.001 to 0.020%,Cr: 13.0 to 24.0%,Ni: 0.01 to 0.60%, andNb: 0.12 to 0.80%, with a balance of Fe and incidental impurities,{'sub': 'IC', 'sup': '1/2', 'wherein the hot-rolled ferritic stainless steel sheet has a threshold stress intensity factor Kof 25 MPa·mor more.'}3. The hot-rolled ferritic stainless steel sheet according to claim 1 , wherein the chemical composition further comprises claim 1 , in mass % claim 1 , one or more selected fromCu: 0.01 to 1.50%,Mo: 0.01 to 2.00%,W: 0.01 to 0.20%, andCo: 0.01 to 0.20%.4. The hot-rolled ferritic ...

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Номер записи: 45
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: 46
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: 47
07-01-2021 дата публикации

NEW DUPLEX STAINLESS STEEL

Номер: US20210002750A1
Автор: ANTONSSON Tomas, NYLOF Lars
Принадлежит: Sandvik Intellectual Property AB

The present disclosure relates to a duplex stainless steel comprising in weight % (wt %): C less than 0.03; Si less than 0.60; Mn 0.40 to 2.00; P less than 0.04; S less than or equal to 0.01; Cr more than 30.00 to 33.00; Ni 6.00 to 10.00; Mo 1.30 to 2.90; N 0.15 to 0.28; Cu 0.60 to 2.20; Al less than 0.05; balance Fe and unavoidable impurities. The present disclosure also relates to a component or a construction material comprising the duplex stainless steel. Additionally, the present disclosure also relates to a process for manufacturing a component comprising said duplex stainless steel. 2. The duplex stainless steel according to claim 1 , wherein said duplex stainless steel has a PRE claim 1 , which is greater than or equal to 36 and wherein PRE=wt % Cr+3.3*wt % Mo.3. The duplex stainless steel according to claim 1 , wherein the content of Al is less than 0.03 wt %.4. The duplex stainless steel according to claim 1 , wherein the content of Si is less than 0.30 wt %.5. The duplex stainless steel according to claim 1 , wherein the content of Mn is 0.60-1.80 wt %.6. The duplex stainless steel according to claim 1 , wherein the content of Ni is 6.50-9.50 wt %.7. The duplex stainless steel according to claim 1 , wherein the content of Cu is 1.10-1.90 wt %.8. The duplex stainless steel according to claim 1 , wherein the content of N is 0.17-0.25 wt %.9. The duplex stainless steel according to claim 1 , wherein the content of Cr is 30.50-32.50 wt %.10. The duplex stainless steel according to claim 1 , wherein the content of Mo is 1.35-2.90 wt %.11. A method for manufacturing a component comprising a duplex stainless steel claim 1 , the method comprising the following steps:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'providing a melt comprising an alloy composition according to ;'}casting the melt to an object;optionally heat-treating the object;hot working the object to a component;heat-treating the component;optionally cold working the component; andoptionally ...

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Номер записи: 48
07-01-2021 дата публикации

A CHEMICAL METHOD TO DECREASE OXIDE SCALE GENERATION IN HOT ROLLING

Номер: US20210002771A1
Автор: BEARD Amy, JIN Weijia, MURPHY Jim
Принадлежит: QUAKER CHEMICAL CORPORATION

The present invention is drawn to a protective coating composition for a metallic substrate and a ceramic film coating layer formed thereon. 1. A protective coating for a metallic substrate to reduce oxide scale formation during hot working , the protective coating comprising at least one high melting point inorganic material presented in an amount raging from about 30.0 wt. % to about 90.0 wt. % , and at least one silicate presented in an amount ranging from about 0.5 wt. % to about 30.0 wt. % , wherein the wt. % is measured by the total weight of the protective coating composition.2. The protective coating of claim 1 , wherein the at least one high melting point inorganic material is selected from the group consisting of a carbide claim 1 , a nitride claim 1 , a boride claim 1 , a metal oxide claim 1 , composite materials thereof and combinations thereof.3. The protective coating of claim 1 , wherein the at least one high melting point inorganic material is selected from the group consisting of calcinized aluminum oxide claim 1 , zirconium silicate (ZrO.SiO claim 1 , Zircopax™) claim 1 , a mixture of zirconium silicate and silica (Zircopax Plus™) claim 1 , zirconium oxide (ZrO) claim 1 , silicon carbide claim 1 , and combinations thereof.4. The protective coating of claim 3 , wherein the at least one high melting point inorganic material is a combination of zirconium silicate claim 3 , silica and silicon carbide claim 3 , or a combination of calcined aluminum oxide and silicon carbide.5. The protective coating composition of claim 1 , wherein the at least one high melting point inorganic material has a median particle size ranging from about 5 μm to about 44 μm.6. The protective coating composition of claim 1 , wherein the at least one high melting point inorganic material is present in an amount range selected from: about 30.0 wt. % to about 40.0 wt. % claim 1 , about 30.0 wt. % to about 50.0 wt. % claim 1 , about 30.0 wt. % to about 60.0 wt. % claim 1 , about 30 ...

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Номер записи: 49
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: 50
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: 51
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: 52
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: 53
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: 54
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: 55
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: 56
20-01-2022 дата публикации

COLD ROLLED AND HEAT-TREATED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME

Номер: US20220017985A1
Автор: ALEXANDRE Patrice, BOUZAT Magali, CHAKRABORTY Anirban, GHASSEMI-ARMAKI Hassan, GIRINA Olga, JACOLOT Ronan, KOLTSOV Alexey, NADLER Aude, PANAHI Damon, SOLER Michel
Принадлежит:

A cold rolled and heat-treated steel sheet having a composition including, by weight percent: C 0.3-0.4%, Mn 2.0-2.6%, Si: 0.8-1.6%, Al 0.01-0.6%, Mo 0.15-0.5%, Cr 0.3-1.0%, Nb≤0.06%, Ti≤0.06%, Ni≤0.8%, S≤0.010%, P≤0.020% and N≤0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction: between 15% and 30% of retained austenite, said retained austenite having a carbon content of at least 0.7%, between 70% and 85% of tempered martensite, at most 5% of fresh martensite and at most 5% of bainite. It also deals with a manufacturing method thereof. 117-. (canceled)18. A cold-rolled and heat-treated steel sheet , made of a steel having a composition comprising , by weight percent:C: 0.3-0.4%Mn: 2.0-2.6%Si: 0.8-1.6%Al: 0.01-0.6%Mo: 0.15-0.5%Cr: 0.3-1.0%Nb≤0.06%Ti≤0.06%Ni≤0.8%S≤0.010%P≤0.020%N≤0.008%Cu≤0.03%and optionally one or more of the following elements, in weight percentage:B: 0.0003-0.005%V≤0.2%a remainder of the composition being iron and unavoidable impurities resulting from processing,the steel sheet having a microstructure consisting of, in surface fraction:between 15% and 30% of retained austenite, said retained austenite having a carbon content of at least 0.7%;between 70% and 85% of tempered martensite;at most 5% of fresh martensite; andat most 5% of bainite.19. The cold-rolled and heat-treated steel sheet as recited in wherein the chromium content is between 0.6% and 0.8%.20. The cold-rolled and heat-treated steel sheet as recited in wherein the silicon content is below 1.5%.21. The cold-rolled and heat-treated steel sheet as recited in wherein the silicon content is below 1.4%.22. The cold-rolled and heat-treated steel sheet as recited in wherein the silicon content is below 1.3%.23. The cold-rolled and heat-treated steel sheet as recited in wherein the cumulated amount of silicon and aluminum is equal to or above 1.6%.24. The cold-rolled and heat ...

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Номер записи: 57
20-01-2022 дата публикации

High-strength hot-dip galvannealed steel sheet and method for producing same

Номер: US20220017986A1
Автор: Mai AOYAMA, Satoshi Maeda, Yoshiyasu Kawasaki, Yusuke Fushiwaki
Принадлежит: JFE Steel Corp

A method for producing a high-strength hot-dip galvannealed steel sheet, in which a high-strength steel sheet is used as a base material, includes a rolling step (x) of rolling a hot-dip galvannealed steel sheet with a coating layer having an Fe concentration of 8% to 17% by mass, and a heat treatment step (y) of heating the coated steel sheet which has been subjected to the rolling step (x) under the conditions satisfying the following formulae (1) and (2):(273+T)×(20+2×log10(t))≥8000  (1)40≤T≤160  (2)where T: heating temperature (° C.) of the coated steel sheet, and t: holding time (hr) at the heating temperature T.

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Номер записи: 58
12-01-2017 дата публикации

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

Номер: US20170009316A1
Автор: Okuda Kaneharu, Yamazake Kazuhiko
Принадлежит: JFE STEEL CORPORATION

Provided are a high-strength hot-rolled steel sheet and a method for manufacturing the steel sheet. The steel sheet includes C: 0.060% or more and 0.140% or less, Si: 1.00% or less, Mn: 1.30% or more and 2.50% or less, P: 0.030% or less, S: 0.0050% or less, Al: 0.070% or less, N: 0.010% or less, Ti: 0.060% or more and 0.140% or less, Cr: 0.10% or more and 0.50% or less, B: 0.0002% or more and 0.0020% or less, and the balance being Fe and inevitable impurities, in which the relationship 5.0≦18C+Mn+1.3Cr+1500B≦6.0 is obtained. The microstructure includes a bainite phase in an amount of more than 90% one, two, or all of a ferrite phase, a martensite phase, and a retained austenite phase in an amount of less than 10%. 1. A high-strength hot-rolled steel sheet having a chemical composition containing , by mass % , C: 0.060% or more and 0.140% or less , Si: 1.00% or less , Mn: 1.30% or more and 2.50% or less , P: 0.030% or less , S: 0.0050% or less , Al: 0.070% or less , N: 0.010% or less , Ti: 0.060% or more and 0.140% or less , Cr: 0.10% or more and 0.50% or less , B: 0.0002% or more and 0.0020% or less , and the balance being Fe and inevitable impurities , in which C , Mn , Cr , and B satisfy relational expression (1) below , and a microstructure Including a bainite phase as a main phase in an amount of more than 90% in terms of area ratio and one , two , or all of a ferrite phase , a martensite phase , and a retained austenite phase as second phases in an amount of less than 10% in total in terms of area ratio , wherein the average grain diameter of the bainite phase is 2.5 μm or less , wherein the spacing between Fe-based carbides precipitated in bainitic ferrite grains in the bainite phase is 600 nm or less , and wherein a tensile strength TS is 980 MPa or more:{'br': None, '5.0≦18C+Mn+1.3Cr+1500B≦6.0 (C,Mn,Cr, and B respectively denote the contents (mass %) of C,Mn,Cr, and B)\u2003\u2003(1).'}2. The high-strength hot-rolled steel sheet according to claim 1 , the ...

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Номер записи: 59
27-01-2022 дата публикации

PRESS HARDENED PART WITH HIGH RESISTANCE TO DELAYED FRACTURE AND A MANUFACTURING PROCESS THEREOF

Номер: US20220025480A1
Автор: BOI Gianni, LUCAS Emmanuel, REMY Blandine, STUREL Thierry
Принадлежит:

A press hardened coated steel part with high resistance to delayed fracture, the coating containing (Fe—Al) intermetallic compounds resulting from the diffusion of iron into an aluminum or an aluminum-based alloy, or an aluminum alloy of a precoating, wherein the chemical composition of the steel includes, in weight: 0.16%≤C≤0.42%, 0.1%≤Mn≤3%, 0.07%≤Si≤1.60%, 0.002%≤Al≤0.070%, 0.02%≤Cr≤1.0%, 0.0005≤B≤0.005%, 0.002%≤Mg≤0.007%, 0.002%≤Ti≤0.11%, 0.0008%≤O≤0.005%, wherein (Ti)×(O)×10≤2, 0.001%≤N≤0.007%, 0.001%≤S≤0.005%, 0.001%≤P≤0.025% and optionally one or more elements selected from the list of: 0.005%≤Ni≤0.23%, 0.005%≤Nb≤0.060%, the remainder being Fe and unavoidable impurities, and wherein the microstructure includes at least 95% martensite. 119-. (canceled)20: A press hardened coated steel part with high resistance to delayed fracture , comprising a base of steel and a coating , the coating containing (Fex-Aly) intermetallic compounds resulting from the diffusion of iron into an aluminum or an aluminum-based alloy , or an aluminum alloy of a precoating , wherein the chemical composition of the steel comprises , in weight:0.16%≤C≤0.42%0.1%≤Mn≤3%0.07%≤Si≤1.60%0.002%≤Al≤0.070%0.02%≤Cr≤1.0%,0.0005≤B≤0.005%0.002%≤Mg≤0.007%0.002%≤Ti≤0.110%0.0008%≤0≤0.005%{'sup': '2', 'wherein (Ti)×(O)×107≤2'}0.001%≤N≤0.007%0.001%≤S≤0.005%0.001%≤P≤0.025%and optionally one or more elements selected from:0.005%≤Ni≤0.23%, and0.005%≤Nb≤0.060%,a remainder being Fe and unavoidable impurities,and wherein a microstructure of the steel includes at least 95% martensite.21: The press hardened coated steel part as recited in wherein 0.18%≤C≤0.35%22: The press hardened coated steel part as recited in wherein 0.55%≤Mn≤1.40%23: The press hardened coated steel part as recited in wherein Si≤0.30%24: The press hardened coated steel part as recited in wherein an average size dof oxides claim 20 , carbonitrides claim 20 , sulfides and oxisulfides is less than 1.7 μm and wherein at least one of the conditions ...

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Номер записи: 60
27-01-2022 дата публикации

ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Номер: US20220025494A1
Автор: Kim Hyun Jong
Принадлежит:

A manufacturing method of an electrical steel sheet according to an embodiment of the present invention includes: hot-rolling a slab to manufacture a hot-rolled sheet; removing some of scales formed on the hot-rolled sheet and leaving a scale layer having a thickness of 10 nm or more; controlling roughness of the hot-rolled sheet in which the scale layer remains; cold-rolling it to manufacture a cold-rolled sheet; and annealing the cold-rolled sheet. 1. An electrical steel sheet comprising:an electrical steel sheet base substrate; anda scale layer present in an inner direction from a surface of the electrical steel sheet base substrate,wherein a thickness of the scale layer is 1 to 100 nm, andthe electrical steel sheet base substrate includes, in wt %, C at 0.1% or less, Si at 6.0% or less, P at 0.5% or less, S at 0.005% or less, Mn at 1.0% or less, Al at 2.0% or less, N at 0.005% or less, Ti at 0.005% or less, Cr at 0.5% or less, and the balance of Fe and inevitable impurities.2. The electrical steel sheet of claim 1 , whereinthe scale layer includes: Si at 5 to 80 wt %, O at 5 to 80 wt %, and the balance of Fe and inevitable impurities.3. The electrical steel sheet of claim 1 , whereinroughness of the scale layer is 0.01 to 0.5 nm.4. The electrical steel sheet of claim 1 , further comprisingan insulating coating layer positioned on the scale layer.5. A manufacturing method of an electrical steel sheet claim 1 , comprising:hot-rolling a slab to manufacture a hot-rolled sheet;removing some of scales formed on the hot-rolled sheet and leaving a scale layer having a thickness of 10 nm or more;controlling roughness of the hot-rolled sheet in which the scale layer remains;cold-rolling the hot-rolled sheet having the controlled roughness to manufacture a cold-rolled sheet; andannealing the cold-rolled sheet.6. The manufacturing method of the electrical steel sheet of claim 5 , wherein{'sup': 3', '3, 'in the leaving of the scale layer, by using a blast method, an inputted ...

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Номер записи: 61
14-01-2016 дата публикации

Ultrathin Alloys

Номер: US20160010170A1
Автор: Bullard Daniel E., McDermott Joseph E., THOMAS Adam G.
Принадлежит: ARCANUM ALLOY DESIGN INC.

Herein is described a process for preparing an alloy that includes defining a product composition, thickness, and homogeneity; providing a base that has a thickness less than the product thickness and has a base composition; depositing an alloying material onto at least one surface of the base to yield a coated base that has a composition equal the product composition but has a different homogeneity; and then full thickness annealing the base and the alloying material to provide the product homogeneity. The process can be used to provide ultrathin foils, for example, ultrathin foils of ferrous or aluminum alloys. 1. (canceled)2. The process of claim 15 , wherein the product composition is selected from the group consisting of a chromium-iron alloy claim 15 , a nickel-iron alloy claim 15 , a chromium-nickel-iron alloy claim 15 , a manganese-iron alloy claim 15 , a chromium-manganese-iron alloy claim 15 , and a chromium-manganese-nickel-iron alloy.3. The process of claim 2 , wherein the product is a stainless steel.4. A process for preparing an thin claim 2 , preferably ultrathin claim 2 , ferrous-alloy or aluminum-alloy product comprising: a thickness of less than 250 μm, and', 'comprises a base composition that includes a majority (wt. %) of iron or aluminum;, 'providing a rolled iron or aluminum base that has'}depositing an alloying material onto a major surface of the base thereby providing a coated base, the coated base having a coated base thickness; and thenannealing the base and alloying material to provide the ferrous-alloy or aluminum-alloy product;wherein the process is free of any cold rolling that reduces the coated base thickness by greater than about 5%.5. The process of claim 4 , wherein the base composition includes at least 85 wt. % iron; and wherein the base composition includes less than about 10 wt. % of any one of the elements selected from the group consisting of carbon claim 4 , silicon claim 4 , boron claim 4 , aluminum claim 4 , phosphorous ...

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Номер записи: 62
14-01-2016 дата публикации

HIGH-HARDNESS LOW-ALLOY WEAR-RESISTANT STEEL SHEET AND METHOD OF MANUFACTURING THE SAME

Номер: US20160010191A1
Автор: LI Hongbin, Song Guobin, YAO Liandeng
Принадлежит:

A high-hardness low-alloy wear-resistant steel sheet and a method of manufacturing the same, which has the chemical compositions (wt %): C: 0.33-0.45%; Si: 0.10-0.50%; Mn: 0.50-1.50%; 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 2.00%; Nb: less than or equal to 0.080%; V: less than or equal to 0.080%; Ti: less than or equal to 0.060%; RE: less than or equal to 0.10%; W: less than or equal to 1.00%; Al: 0.010-0.080%, Ca: 0.0010-0.0080%, N: less than or equal to 0.0080%, O: 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 (Cr15+Mn/6+50B): more than or equal to 0. 20% and less than or equal to 0.50%; (Mo/3+Ni/5+2Nb): more than or equal to 0.02% and less than or equal to 0.50%; (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 steel sheet obtained from the above-mentioned chemical compositions and processes, has high hardness, excellent wear-resistant performance, and is applicable to a variety of parts in mechanical equipments extremely vulnerable to wearing. 1. A high-hardness low-alloy wear-resistant steel sheet comprising:a) 0.33-0.45 wt % carbon (C);b) 0.10-0.50 wt % silicon (Si);c) 0.50-1.50 wt % manganese (Mn);d) 0.0005-0.0040 wt % boron (B);e) less than or equal to 1.50 wt % chromium (Cr);f) less than or equal to 0.80 wt % molybdenum (Mo);g) less than or equal to 2.00 wt % nickel (Ni);h) less than or equal to 0.080 wt % niobium (Nb);i) less than or equal to 0.080 wt % vanadium (V);j) less than or equal to 0.060 wt % titanium (Ti);k) less than or equal to 0.10 wt % rhenium (Re);l) less than or equal to 1.00 wt % tungsten (W);m) 0.010-0.080 wt % aluminum (Al);n) 0.0010-0.0080 wt % calcium (Ca);o) less than or equal to 0.0080 wt % nitrogen (N);p) less than or equal to 0.0080 wt % oxygen (O);q) less than or equal to 0.0004 wt % hydrogen (H);r ...

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Номер записи: 63
14-01-2016 дата публикации

THICK, TOUGH, HIGH TENSILE STRENGTH STEEL PLATE AND PRODUCTION METHOD THEREFOR

Номер: US20160010192A1
Автор: ENDO Shigeru, Hase Kazukuni, Ichimiya Katsuyuki, KITSUYA Shigeki, MATSUNAGA Naoki
Принадлежит:

A thick, high-toughness high-strength steel plate has excellent strength and toughness in the central area through the plate thickness. The thick steel plate has a specific chemical composition and includes a microstructure having, throughout an entire region in the plate thickness direction, an average prior austenite grain size of not more than 50 μm and a martensite and/or bainite phase area fraction of not less than 80%. A continuously cast slab having the specific chemical composition is heated to 1200° C. to 1350° C., hot worked with a strain rate of not more than 3/s and a cumulative working reduction of not less than 15%, and thereafter hot rolled and heat treated. 19-. (canceled)10. A thick , high-toughness high-strength steel plate having a plate thickness of not less than 100 mm , the steel plate comprising a microstructure having , throughout an entire region in a plate thickness direction , an average prior austenite grain size of not more than 50 μm and a martensite and/or bainite phase area fraction of not less than 80%.11. The steel plate according to claim 10 , wherein the yield strength is not less than 620 MPa.12. The steel plate according to claim 10 , wherein a reduction of area after fracture in a tensile test in the direction of the plate thickness of the steel plate is not less than 25%.13. A method of manufacturing a thick claim 10 , high-toughness high-strength steel plate having a plate thickness of not less than 100 mm claim 10 , the steel plate including a microstructure having throughout an entire region in the plate thickness direction claim 10 , an average prior austenite grain size of not more than 50 μm and a martensite and/or bainite phase area fraction of not less than 80% claim 10 , the method comprising:heating a continuously cast slab to 1200° C. to 1350° C.,hot working the slab at not less than 1000° C. with a strain rate of not more than 3/s and a cumulative working reduction of not less than 15%, andhot rolling, quench ...

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Номер записи: 64
14-01-2016 дата публикации

THICK STEEL PLATE AND PRODUCTION METHOD FOR THICK STEEL PLATE

Номер: US20160010193A1
Автор: HAYASHI Kenji, Ichimiya Katsuyuki, Terazawa Yusuke
Принадлежит: JFE STEEL CORPORATION

Provided are a steel plate having high tensile strength, high yield strength, and excellent low-temperature toughness and a method for manufacturing the steel plate. 1. A steel plate containing 0.04% to 0.15% C , 0.1% to 2.0% Si , 0.8% to 2.0% Mn , 0.025% or less P , 0.020% or less S , 0.001% to 0.100% Al , 0.010% to 0.050% Nb , and 0.005% to 0.050% Ti on a mass basis , the steel plate further containing Cu , Ni , Cr , Mo , and N on a mass basis such that 0.5%≦Cu+Ni+Cr+Mo≦3.0% and 1.8≦Ti/N≦4.5 are satisfied , a remainder being Fe and inevitable impurities ,wherein an area fraction of polygonal ferrite is less than 10%, the effective grain size at the through-thickness center is 15 μm or less, and a standard deviation of the effective grain size is 10 μm or less.2. The steel plate according to claim 1 , further containing one or more of 0.01% to 0.10% V claim 1 , 0.01% to 1.00% W claim 1 , 0.0005% to 0.0050% B claim 1 , 0.0005% to 0.0060% Ca claim 1 , 0.0020% to 0.0200% of a REM claim 1 , and 0.0002% to 0.0060% Mg on a mass basis.3. A method for manufacturing the steel plate according to claim 1 , comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'a heating step of heating a steel plate having a composition specified in to a temperature of 950° C. to 1,150° C.;'}a recrystallization temperature region rolling step of performing rolling with a rolling shape factor of 0.5 or more and a rolling reduction of 6.0% or more per pass at a through-thickness center temperature of 930° C. to 1,050° C. three or more passes after the heating step;a non-recrystallization temperature region rolling step of performing rolling with a rolling shape factor of 0.5 or more and total rolling reduction of 35% or more at the through-thickness center temperature of lower than 930° C. one or more passes after the recrystallization temperature region rolling step; and{'sub': '3', 'a cooling step of performing cooling under conditions where cooling is started at the through-thickness ...

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Номер записи: 65
14-01-2021 дата публикации

HOT-ROLLED STEEL SHEET HAVING EXCELLENT DURABILITY AND METHOD FOR MANUFACTURING SAME

Номер: US20210010098A1
Автор: NA Hyun-Taek, SEO Seok-Jong
Принадлежит:

The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet having excellent durability and a method for manufacturing same, the hot-rolled steel sheet having no cracks formed on a material and a welding heat-affected zone (HAZ) even after pipemaking and molding due to a smaller decrease in the strength of the welding heat-affected zone formed during electric resistance welding in comparison with the strength of the material (base material). 1. A hot-rolled steel sheet having excellent durability , comprising:by weight %, 0.05-0.14% of carbon (C), 0.1-1.0% of silicon (Si), 0.8-1.8% of manganese (Mn), 0.001-0.03% of phosphorous (P), 0.001-0.01% of sulfur (S), 0.1-0.5% of soluble aluminum (Sol.Al), 0.3-1.0% of chromium (Cr), 0.01-0.05% of titanium (Ti), 0.03-0.06% of niobium (Nb), 0.04-0.1% of vanadium (V), 0.001-0.01% of nitrogen (N), and a balance of Fe and inevitable impurities,wherein Mn and Si satisfy relational formula 1 as below,wherein a microstructure includes a hard phase including martensite and bainite phases mixed therein with a ferrite phase as a matrix structure, and {'br': None, '4 Подробнее

Номер записи: 66
14-01-2021 дата публикации

STEEL MATERIAL SUITABLE FOR USE IN SOUR ENVIRONMENT

Номер: US20210010099A1
Автор: Arai Yuji, Kamitani Hiroki, Soma Atsushi, YOSHIDA Shinji
Принадлежит:

The steel material according to the present disclosure contains a chemical composition consisting of, in mass %, C: 0.20 to 0.50%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.20 to 1.50%, Mo: 0.25 to 1.50%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0100% or less and O: 0.0100% or less, with the balance being Fe and impurities. The steel material contains an amount of dissolved C within a range of 0.010 to 0.050 mass %. The steel material also has a yield strength within a range of 965 to 1069 MPa, and a yield ratio of the steel material is 90% or more. 1. A steel material comprising:a chemical composition consisting of, in mass %,C: 0.20 to 0.50%,Si: 0.05 to 1.00%,Mn: 0.05 to 1.00%,P: 0.025% or less,S: 0.0100% or less,Al: 0.005 to 0.100%,Cr: 0.20 to 1.50%,Mo: 0.25 to 1.50%,Ti: 0.002 to 0.050%,B: 0.0001 to 0.0050%,N: 0.0100% or less,O: 0.0100% or less,V: 0 to 0.60%,Nb: 0 to 0.030%,Ca: 0 to 0.0100%,Mg: 0 to 0.0100%,Zr: 0 to 0.0100%,Co: 0 to 0.50%,W: 0 to 0.50%,Ni: 0 to 0.50%,Cu: 0 to 0.50%,rare earth metal: 0 to 0.0100%, andwith the balance being Fe and impurities,an amount of dissolved C within a range of 0.010 to 0.050 mass %,a yield strength within a range of 965 to 1069 MPa, anda yield ratio of 90% or more.2. The steel material according to claim 1 , wherein the chemical composition contains one or more types of element selected from the group consisting of:V: 0.01 to 0.60%, andNb: 0.002 to 0.030%.3. The steel material according to claim 1 , wherein the chemical composition contains one or more types of element selected from the group consisting of:Ca: 0.0001 to 0.0100%,Mg: 0.0001 to 0.0100%, andZr: 0.0001 to 0.0100%.4. The steel material according to claim 1 , wherein the chemical composition contains one or more types of element selected from the group consisting of:Co: 0.02 to 0.50%, andW: 0.02 to 0.50%.5. The steel material according to any one of claim 1 , wherein the chemical composition ...

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Номер записи: 67
14-01-2021 дата публикации

HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Номер: US20210010101A1
Автор: AOYAMA Mai, Endo Kazuki, Funakawa Yoshimasa, Kawasaki Yoshiyasu, Toji Yuki
Принадлежит: JFE STEEL CORPORATION

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

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Номер записи: 68
14-01-2021 дата публикации

LOW-TEMPERATURE STEEL MATERIAL HAVING EXCELLENT TOUGHNESS IN WELDING PORTION THEREOF AND MANUFACTURING METHOD THEREFOR

Номер: US20210010114A1
Автор: LEE Hak-Cheol
Принадлежит:

Provided according to a preferable aspect of the present invention are a low-temperature steel material having excellent toughness in a welding portion thereof and a manufacturing method therefor, the low-temperature steel material comprising, by weight %, 0.02-0.06% of C, 6.0-7.5% of Ni, 0.4-1.0% of Mn, 0.02-0.15% of Si, 0.02-0.3% of Mo, 0.02-0.3% of Cr, 50 ppm or less of P, 10 ppm or less of S, 0.005-0.015% of Ti, 60 ppm or less of N, with a Ti/N weight % ratio of 2.5 of 4, and the balance of iron (Fe) and other inevitable impurities; and having: an effective grain size of 50 micrometers or less, with a boundary angle found to be 15 degrees or greater as measured by EBSD in an area of a fusion line (FL)-FL+1 mm in a weld heat-affected zone of a weld portion welded at a heat input of 5-50 kJ/cm; and an impact toughness of 70 J or higher at −196° C. as measured in an area of fusion line (FL)-FL+1 mm. 1. A low-temperature steel material having excellent welding-portion toughness , comprising:in weight %, 0.02 to 0.06% of C, 6.0 to 7.5% of Ni, 0.4 to 1.0% of Mn, 0.02 to 0.15% of Si, 0.02 to 0.3% of Mo, 0.02 to 0.3% of Cr, 50 ppm or less of P, 10 ppm or less of S, 0.005 to 0.015% of Ti, 60 ppm or less of N, a Ti/N weight % ratio of 2.5 of 4, and a balance of iron (Fe) and other unavoidable impurities,wherein in a weld heat-affected zone of a welding portion welded with a heat input of 5 to 50 kJ/cm, an effective grain size having a boundary angle of 15 degrees or greater in an area of a fusion line (FL) to FL+1 mm, measured by EBSD, is 50 micrometers or less, and an impact toughness measured in the area of the fusion line (FL) to FL+1 mm is 70 J or higher at −196° C.2. The low-temperature steel material having excellent welding-portion toughness of claim 1 , wherein a yield strength of the low-temperature steel material is 585 MPa or higher.3. The low-temperature steel material having excellent welding-portion toughness of claim 1 , wherein an impact transition ...

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Номер записи: 69
10-01-2019 дата публикации

Lean duplex stainless steel having improved corrosion resistance and machinability, and manufacturing method therefor

Номер: US20190010573A1
Автор: Hak Kim, Jeom Yong Choi
Принадлежит: Posco Co Ltd

A lean duplex stainless steel and a method of manufacturing the same are provided. The lean duplex stainless steel includes, in percent (%) by weight of the entire composition, 0.08% or less of carbon (C) (excluding 0), 0.7 to 1.1% of silicon (Si), 2.4 to 3.5% of manganese (Mn), 17.9 to 20.7% of chromium (Cr), 0.05 to 1.15% of nickel (Ni), 0.18 to 0.3% of nitrogen (N), 0.4 to 2.8% of copper (Cu), and the remainder of iron (Fe) and inevitable impurities, wherein a predicted pitting potential is from 360 to 440 mV. Thus, manufacturing costs may be reduced via adjustment of components of the duplex stainless steel and both of formability and corrosion resistance may be improved by improving corrosion resistance and increasing elongation. Formability may be improved by inhibiting formation of thermal martensite and increasing elongation via adjustment of cooling conditions during coiling and cooling after hot rolling.

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Номер записи: 70
10-01-2019 дата публикации

STEEL SHEET FOR HOT PRESSING AND HOT PRESSED ARTICLE USING THE SAME

Номер: US20190010587A1
Автор: Ikeda Shushi, Kurz Thomas, Murakami Toshio, Naitou Junya, Okita Keisuke, Pichler Andreas, SATO Shinji
Принадлежит:

A steel sheet for hot pressing includes in a chemical composition, in percent by mass, C of 0.1% to 0.4%, Si of greater than 0% to 2.0%, Mn of 0.5% to 3.0%, P of greater than 0% to 0.015%, S of greater than 0% to 0.01%, F3 of 0.0003% to 0.01%, N of greater than 0% to 0.05%, Al in a content of 2×[N]% to 0.3% at a Si content of greater than 0.5% to 2.0%; or Al in a content of (0.20+2×[N]-0.40×[Si]N)% to 0.3% at a Si content of 0% to 0.5%, where [N] and [Si] are contents of N and Si, respectively, in mass percent, with the remainder being iron and inevitable impurities, where contents of Ti, Zr, Hf, and Ta, of the inevitable impurities, are each controlled to 0.005% or lower. The steel sheet includes nitride-based inclusions with an equivalent circle diameter of 1 μm or more in a number density of 0.10 per square millimeter. 1. A steel sheet for hot pressing , comprising , in a chemical composition:C in a content of 0.1% to 0.4%;Si in a content of 0% to 2.0%;Mn in a content of 0.5% to 3.0%;P in a content of greater than 0% to 0.015%;S in a content of greater than 0% to 0.01%:B in a content of 0.0003% to 0.01%;N in a content of greater than 0% to 0.05%; andAl in a content of 2×[N]% to 0.3% at a Si content of greater than 0.5% to 2.0%; or Al in a content of (0.20+2×[N]-0.40×[Si])% to 0.3% at a Si content of 0% to 0.5%, where [N] and [Si] are contents of N and Si, respectively, in mass percent,with the remainder being iron and inevitable impurities,the steel sheet having contents of Ti, and Ta, of the inevitable impurities, controlled to 0.005% or lower; andthe steel sheet comprising nitride-based inclusions with an equivalent circle diameter of 1 μm or more in a number density of less than 0.10 per square millimeter.3. A hot pressed article having the chemical composition as defined in claim 1 ,the hot pressed article comprising martensite in an area percentage of 90% or higher of an entire microstructure thereof; andthe hot pressed article having a number density of ...

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Номер записи: 71
10-01-2019 дата публикации

Austenitic stainless steel having improved processability

Номер: US20190010588A1
Автор: Dong Chul Chae, Gyu Jin Jo, Hyung Gu KANG, Jee Hyun YU, Jeom Yong Choi
Принадлежит: Posco Co Ltd

Disclosed is an austenitic stainless steel with increased workability. The austenitic stainless steel includes, based on % by weight, silicon (Si): 0.1 to 0.65%, manganese (Mn): 0.2 to 3.0%, nickel (Ni): 6.5 to 10.0%, chromium (Cr): 16.5 to 20.0%, copper (Cu): 6.0% or less (excluding 0), the sum of carbon (C) and nitrogen (N): 0.08% or less (excluding 0), and the remainder being Fe and unavoidable impurities, wherein the austenitic stainless steel has a work hardening rate of 1500 MPa or less within a true strain range of 0.15 to 0.4. Therefore, when a sink bowl and the like are processed using the austenitic stainless steel, the true strain and work hardening rate of which are controlled, the occurrence of delayed fracture in a molded corner thereof, which has been subjected to a large amount of processing, can be prevented.

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Номер записи: 72
09-01-2020 дата публикации

HOT PRESS-FORMED MEMBER HAVING EXCELLENT CRACK PROPAGATION RESISTANCE AND DUCTILITY, AND METHOD FOR PRODUCING SAME

Номер: US20200010915A1
Автор: BAK Won-Mo, Cho Yeol-Rae, Kim Seong-Woo, Oh Jin-Keun
Принадлежит:

Provided is a hot press-formed member having excellent crack propagation resistance and ductility. The hot press-formed member includes: a base steel sheet and a zinc or zinc alloy plating layer on at least one surface of the base steel sheet. The base steel sheet contains, by wt %, carbon (C): 0.08-0.30%, silicon (Si): 0.01-2.0%, manganese (Mn): 3.1-8.0%, aluminum (Al): 0.001-0.5%, phosphorus (P): 0.001-0.05%, sulfur (S): 0.0001-0.02%, nitrogen (N): 0.02% or less, and a balance of iron (Fe) and other impurities. The hot press-formed member comprises 1-30 area % of retained austenite as a microstructure, and a Mn(wt %)/Zn(wt %) content ratio in an oxide layer of 0.5-1.2 μm in a thickness direction from a surface layer of the plating layer is 0.1 or more. 1. A hot press-formed member having excellent crack propagation resistance and ductility , the hot press-formed member comprising a base steel sheet and a zinc or zinc alloy plating layer on at least one surface of the base steel sheet ,wherein the base steel sheet contains, by wt %, carbon (C): 0.08-0.30%, silicon (Si): 0.01-2.0%, manganese (Mn): 3.1-8.0%, aluminum (Al): 0.001-0.5%, phosphorus (P): 0.001-0.05%, sulfur (S): 0.0001-0.02%, nitrogen (N): 0.02% or less, and a balance of iron (Fe) and other impurities,wherein the hot press-formed member comprises 1-30 area % of retained austenite as a microstructure, and a Mn(wt %)/Zn(wt %) content ratio in an oxide layer of 0.5-1.2 μm in a thickness direction from a surface layer of the plating layer is 0.1 or more.2. The hot press-formed member having excellent crack propagation resistance and ductility of claim 1 , wherein the base steel sheet further contains at least one group selected from groups (1) to (4):(1) at least one of chromium (Cr) and molybdenum (Mo), a total content thereof being 0.001-2.0%;(2) at least one of titanium (Ti), niobium (Nb), and vanadium (V), a total content thereof being 0.001-0.2%;(3) at least one of copper (Cu) and nickel (Ni), a total ...

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Номер записи: 73
09-01-2020 дата публикации

HIGH STRENGTH STEEL SHEET

Номер: US20200010919A1
Автор: ABUKAWA Genki, Hayashi Kunio, NAKANO Katsuya, SUZUKI Yuya
Принадлежит: NIPPON STEEL CORPORATION

High strength steel sheet having a tensile strength of 800 MPa or more comprising a middle part in sheet thickness and a soft surface layer arranged at one side or both sides of the middle part in sheet thickness, wherein each soft surface layer has a thickness of more than 10 μM and 30% or less of the sheet thickness, the soft surface layer has an average Vickers hardness of more than 0.60 time and 0.90 time or less the average Vickers hardness of the sheet thickness 1/2 position, and the soft surface layer has a nano-hardness standard deviation of 0.8 or less is provided. 112-. (canceled)13. High strength steel sheet having a tensile strength of 800 MPa or more comprising a middle part in sheet thickness and a soft surface layer arranged at one side or both sides of the middle part in sheet thickness , wherein each soft surface layer has a thickness of more than 10 μm and 30% or less of the sheet thickness , the soft surface layer has an average Vickers hardness of more than 0.60 time and 0.90 time or less the average Vickers hardness of the sheet thickness 1/2 position , and the soft surface layer has a nano-hardness standard deviation of 0.8 or less.14. The high strength steel sheet according to claim 13 , wherein the high strength steel sheet further comprises a hardness transition zone formed between the middle part in sheet thickness and each soft surface layer while adjoining them claim 13 , wherein the hardness transition zone has an average hardness change in the sheet thickness direction of 5000 (ΔHv/mm) or less.15. The high strength steel sheet according to claim 13 , wherein the middle part in sheet thickness comprises claim 13 , by area percent claim 13 , 10% or more of retained austenite.16. The high strength steel sheet according to claim 14 , wherein the middle part in sheet thickness comprises claim 14 , by area percent claim 14 , 10% or more of retained austenite.17. The high strength steel sheet according to claim 13 , wherein the middle part in ...

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Номер записи: 74
09-01-2020 дата публикации

STEEL SHEET, METHOD OF MANUFACTURING SAME, CROWN CAP, AND DRAWING AND REDRAWING (DRD) CAN

Номер: US20200010920A1
Автор: Kariya Nobusuke, KATAGIRI Akihiro, Kojima Katsumi, Ueno Takashi, YAMAMOTO Yoshihide
Принадлежит: JFE STEEL CORPORATION

Provided is a steel sheet having sufficient formability and strength even after sheet metal thinning, the steel sheet including: a chemical composition containing, by mass %, C: more than 0.0060% and not more than 0.012%, Si: 0.02% or less, Mn: 0.10% or more and 0.60% or less, P: 0.020% or less, S: 0.020% or less, Al: 0.01% or more and 0.07% or less, and N: 0.0080% or more and 0.0200% or less, with the balance being Fe and inevitable impurities, in which a dislocation density at a depth position of ½ of a sheet thickness from a surface of the steel sheet is 2.0×10/mor more and 1.0×10/mor less. 1. A steel sheet comprising: C: more than 0.006% and not more than 0.012%,', 'Si: 0.02% or less,', 'Mn: 0.10% or more and 0.60% or less,', 'P: 0.020% or less,', 'S: 0.020% or less,', 'Al: 0.01% or more and 0.07% or less, and', 'N: 0.0080% or more and 0.0200% or less,, 'a chemical composition containing, by mass %,'}with the balance being Fe and inevitable impurities; wherein{'sup': 14', '2', '15', '2, 'a dislocation density at a depth position of ½ of a sheet thickness from a surface of the steel sheet is 2.0×10/mor more and 1.0×10/mor less.'}2. The steel sheet according to claim 1 , having a thickness of 0.20 mm or less.3. A crown cap made of the steel sheet as recited in .4. A DRD can made of the steel sheet as recited in .5. A method of manufacturing the steel sheet as recited in claim 1 , comprising:a hot rolling step of heating a steel raw material at 1200° C. or higher, finish rolling the steel raw material to obtain a hot rolled sheet, and then coiling the hot rolled sheet within a temperature range of 670° C. or lower;a pickling step of pickling the hot rolled sheet after the hot rolling step;a primary cold rolling step of cold rolling the hot rolled sheet after the pickling step to obtain a cold rolled sheet;an annealing step of annealing the cold rolled sheet after the primary cold rolling step in a temperature range of 650° C. to 750° C. to obtain an annealed sheet; ...

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Номер записи: 75
09-01-2020 дата публикации

HOT ROLLED STEEL PRODUCT WITH ULTRA-HIGH STRENGTH MINIMUM 1100MPA AND GOOD ELONGATION 21%

Номер: US20200010921A1
Автор: BHAGAT A. N., KUNDU Saurabh, Saha Rajib
Принадлежит:

Present invention discloses a high strength hot rolled steel product with tensile strength at least 1100 MPa and elongation not less than 21%. The steel further has uniform elongation not less than 10% and yield and tensile ratio 0.6-0.7. The steel further has tensile toughness in the range 19-23.5 GPa %. The developed steel is primarily aimed for automotive structural applications and also for many other such as defence where good combination of strength and ductility required is very high. The developed steel product has following composition C: 0.15-0.23, Mn: 0.8-2.1, Si: 0.3-1.1, Cr: 0.8-1.3, Mo: 0.08-0.25, Nb: 0.018-0.035, Ti—0.01-0.1 S—0.008 max, P—0.025 max, Al—0.05 to 0.3, N—0.005 max. The liquid metal was continuous cast into slab casting. The cast slab was soaked above 1150° C. for few hours and subsequently the cast structure was broken by deformation prior to hot rolling. The slab was then hot rolled into strip with thickness not less than 10 mm with finish rolling temperature in austenite region and subsequently cooled to above Ms (martensite temperature) but below Bs (Below Bainite start temperature) to avoid polygonal ferrite. The steel with above mentioned properties was developed using existing hot rolling. 1. An ultra-high-strength hot-rolled steel strip or sheet with tensile strength of at least 1100 MPa and total elongation not less than 21% , comprising in weight percentage:C: 0.12 to 0.24;Mn: 0.8 to 2.1;Si: 0.4 to 1.1;Cr: 0.8 to 1.5;Al—0.05 to 0.3;Mo: 0.05 to 0.25;Nb: 0.018 to 0.035;Ti—0.01 to 0.1;S—0.008 max’P—0.025 max; andN—0.005 max.2. The ultra-high-strength hot-rolled steel strip or sheet as claimed in claim 1 , wherein Mo claim 1 , Si claim 1 , Al claim 1 , Ti claim 1 , Cr varies preferably in the range of 0.08 to 0.12 claim 1 , 0.4 to 0.8 claim 1 , 0.1 to 0.29 claim 1 , 0.02 to 0.04 and 0.85 to 1.1 respectively.3. The ultra-high-strength hot-rolled steel strip or sheet as claimed in claim 1 , wherein the steel has YS to TS greater than ...

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Номер записи: 76
09-01-2020 дата публикации

Iron-based multi-phase environmentally-friendly hydrogen storage material

Номер: US20200010939A1
Автор: Huang Qian
Принадлежит:

The invention provides an iron-based multi-phase environmentally-friendly hydrogen storage material, which is prepared by the following method: the Ti, V, Fe, Zr, Ce and Gd metal raw materials are weighed according to a preset chemical formula; then the Ti, V, Fe, Zr, Ce and Gd metal raw materials are vacuum smelted to obtain the first TiVFe alloy ingots; then perform the first heat treatment for the first TiVFe alloy ingots; after the first heat treatment, the first TiVFe alloy ingots are subjected to the first rolling to obtain the second TiVFe alloy ingots; then the second heat treatment is performed on the second TiVFe alloy ingots; and after the second heat treatment, the second TiVFe alloy ingots are subjected to the second rolling to obtain the third TiVFe alloy ingots; and the third TiVFe alloy ingots are then subjected to a third heat treatment. 1. An iron-based multi-phase environmentally-friendly hydrogen storage material , characterized in that: the iron-based multi-phase environmentally-friendly hydrogen storage material is prepared by the following method:Provide Ti, V, Fe, Zr, Ce, and Gd metal raw materials;The Ti, V, Fe, Zr, Ce, and Gd metal materials are weighed according to a preset chemical formula;After weighing, the Ti, V, Fe, Zr, Ce, and Gd metal raw materials are vacuum smelted to obtain the first TiVFe alloy ingots;Perform a first heat treatment on the first TiVFe alloy ingots;Perform a first rolling on the first TiVFe alloy ingots after the first heat treatment to obtain the second TiVFe alloy ingots;Perform a second heat treatment on the second TiVFe alloy ingots;Perform a second rolling on the second TiVFe alloy ingots after the second heat treatment to obtain the third TiVFe alloy ingots;The third TiVFe alloy ingots is then subjected to a third heat treatment.2. The iron-based multi-phase environmentally-friendly hydrogen storage material mentioned in claim 1 , characterized in that: in this patent claim 1 , the preset chemical formula is ...

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Номер записи: 77
15-01-2015 дата публикации

METHOD FOR ROLLING/DRAWING NICKEL-FREE HIGH-NITROGEN STAINLESS STEEL MATERIAL, THIN SEAMLESS TUBE OF NICKEL-FREE HIGH-NITROGEN STAINLESS STEEL, AND METHOD OF MANUFACTURING THE SAME

Номер: US20150013820A1
Автор: Katada Yasuyuki, Taguchi Tetsushi
Принадлежит: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Provided is a method of rolling/drawing a nickel-free high-nitrogen stainless steel material, the method including: an intermediate annealing process S in which a nickel-free high-nitrogen stainless steel material made of a fine grain structure having a maximum crystal grain size of 30 μm or less is annealed at a temperature of 900° C. or higher and 1000° C. or lower and then is air-cooled to room temperature; a rolling/drawing process S in which the nickel-free high-nitrogen stainless steel material is extended while being thinned or being reduced in diameter; and a final solution treatment process S in which the nickel-free high-nitrogen stainless steel material is heated to a temperature of 1200° C. or higher and 1400° C. or lower and then is air-cooled to room temperature. A nickel-free high-nitrogen stainless steel raw tube made of a fine grain structure having a maximum crystal grain size of 30 μm or less is subjected to plastic working according to the method of rolling/drawing the nickel-free high-nitrogen stainless steel material to obtain a thin seamless tube for the nickel-free high-nitrogen stainless steel stent. The thin seamless tube for the nickel-free high-nitrogen stainless steel stent is made of a fine grain structure having a maximum crystal grain size of 30 μm or less. 1. A method of rolling/drawing a nickel-free high-nitrogen stainless steel material , the method comprising:an intermediate annealing process in which a nickel-free high-nitrogen stainless steel material made of a fine grain structure having a maximum crystal grain size of 30 um or less is annealed at a temperature of 900° C. or higher and 1000° C. or lower and then is air-cooled to room temperature;a rolling/drawing process in which the nickel-free high-nitrogen stainless steel material is extended while being thinned or being reduced in diameter after the intermediate annealing process; anda final solution treatment process in which the nickel-free high-nitrogen stainless steel ...

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Номер записи: 78
03-02-2022 дата публикации

COLD ROLLED AND COATED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

Номер: US20220033925A1
Автор: ALIBEIGI Samaneh
Принадлежит:

A cold rolled and heat treated steel sheet having a composition having the following elements: 0.13%≤Carbon≤0.18%, 1.1%≤Manganese≤1.8%, 0.5%≤Silicon≤0.9%, 0.6%≤Aluminum≤1%, 0.002%≤Phosphorus≤0.02%, 0%≤Sulfur≤0.003%, 0%≤Nitrogen≤0.007% 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 iron and unavoidable impurities caused by processing, the microstructure of the steel sheet being in area fraction, 60 to 75% Ferrite, 20 to 30% Bainite, 10 to 15% Residual Austenite, and 0% to 5% Martensite, wherein the cumulated amounts of Residual Austenite and Ferrite is between 70% and 80%. 120-. (canceled)21. A cold rolled steel sheet having a composition comprising the following elements , expressed in percentage by weight:0.13%≤Carbon≤0.18%1.1%≤Manganese≤1.8%0.5%≤Silicon≤0.9%0.6%≤Aluminum≤1%0.002%≤Phosphorus≤0.02%0%≤Sulfur≤0.003%.0%≤Nitrogen≤0.007%and optionally one or more of the following 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%;a remainder of the composition being composed of iron and unavoidable impurities caused by processing,a microstructure of the steel sheet comprising in area fraction, 60 to 75% Ferrite, 20 to 30% Bainite, 10 to 15% Residual Austenite, and 0% to 5% Martensite, wherein cumulated amounts of the Residual Austenite and the Ferrite is between 70% and 80%.22. The cold rolled steel sheet as recited in wherein the composition includes 0.6% to 0.8% of Silicon.23. The cold rolled steel sheet as recited in wherein the composition includes 0.14% to 0.18% of Carbon.24. The cold rolled steel sheet as recited in ...

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Номер записи: 79
03-02-2022 дата публикации

HIGH-STRENGTH COLD ROLLED STEEL SHEET HAVING HIGH HOLE EXPANSION RATIO, HIGHSTRENGTH HOT-DIP GALVANIZED STEEL SHEET, AND MANUFACTURING METHODS THEREFOR

Номер: US20220033926A1
Автор: IM Young-Roc, KOO Min-Seo, KWAK Jai-Hyun, Park Jong-chan
Принадлежит:

Provided is a high-strength cold rolled steel sheet, a high-strength hot-dip galvanized steel sheet manufactured using the cold rolled steel sheet, and manufacturing methods therefor, the high-strength cold rolled steel sheet comprising, by wt %, 0.17-0.21% of carbon (C), 0.3-0.8% of silicon (Si), 2.7-3.3% of manganese (Mn), 0.3-0.7% of chromium (Cr), 0.01-0.3% of aluminum (Al), 0.01-0.03% of titanium (Ti), 0.001-0.003% of boron (B), 0.04% or less of phosphorus (P), 0.02% or less of sulfur (S), 0.01% or less of nitrogen (N) and the balance of iron (Fe) and other inevitable impurities, wherein the amounts of carbon (C), silicon (Si) and aluminum (Al) satisfy the following mathematical relation (1). [Mathematical relation (1)] [C]+([Si]+[Al])/5≤0.35% (wherein [C], [Si] and [Al] respectively mean the wt % of C, Si and Al.) 1. A high-strength cold rolled steel sheet comprising: {'br': None, '[C]+([Si]+[Al])/5≤0.35%\u2003\u2003[Equation (1)]'}, 'by weight percent (wt %), 0.17 to 0.21% of carbon (C), 0.3 to 0.8% of silicon (Si), 2.7 to 3.3% of manganese (Mn), 0.3 to 0.7% of chromium (Cr, 0.01 to 0.3% of aluminum (Al), 0.01 to 0.03% of titanium (Ti), 0.001 to 0.003% of boron (B), 0.04% or less of phosphorus (P), 0.02% or less of sulfur (S), 0.01% or less of nitrogen (N), the balance of iron (Fe), and other inevitable impurities, wherein the contents of carbon (C), silicon (Si), and aluminum (Al) satisfy Equation 1 below, a microstructure thereof includes, by area fraction, 3 to 7% of retained austenite, 5 to 15% of fresh martensite, 5% or less (including 0%) of ferrite, and the balance of bainite or tempered martensite, and, by volume fraction, 1 to 3% of a cementite phase, as a second phase, is precipitated and distributed between bainite laths or in the laths or grain boundary of a tempered martensite phase,'}wherein [C], [Si], [Al] refer to weight percents of C, Si, and Al, respectively.2. The high-strength cold rolled steel sheet of claim 1 , wherein the cold rolled ...

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Номер записи: 80
03-02-2022 дата публикации

HOT ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME

Номер: US20220033927A1
Автор: NAKADA Kohei, TOYODA Takeshi
Принадлежит: NIPPON STEEL CORPORATION

Provided is a hot rolled steel sheet comprising a predetermined chemical composition, and a metallic structure comprising, by area ratio, pearlite: 90 to 100%, pseudo pearlite: 0 to 10%, and pro-eutectoid ferrite: 0 to 1%, wherein the pearlite has an average lamellar spacing of 0.20 μm or less, and the pearlite has an average pearlite block size of 20.0 μm or less. Provided is a method for producing a hot rolled steel sheet comprising heating a slab to 1100° C. or more, hot rolling where an exit side temperature of finishing rolling is 820 to 920° C., primary cooling the steel sheet down to an Ae1 point by an average cooling rate of 40 to 80° C./s, then secondary cooling the steel sheet from the Ae1 point down to a coiling temperature by an average cooling rate of less than 20° C./s, and coiling the steel sheet at a coiling temperature of 540 to 700° C. 16-. (canceled)7. A hot rolled steel sheet comprising a chemical composition comprising , by mass % ,C: 0.50 to 1.00%,Si: 0.01 to 0.50%,Mn: 0.50 to 2.00%,P: 0.100% or less,S: 0.0100% or less,Al: 0.100% or less,N: 0.0100% or less,Cr: 0.50 to 2.00%,Cu: 0 to 1.00%,Ni: 0 to 1.00%,Mo: 0 to 0.50%,Nb: 0 to 0.10%,V: 0 to 1.00%,Ti: 0 to 1.00%,B: 0 to 0.0100%,Ca: 0 to 0.0050%,REM: 0 to 0.0050%, andbalance: Fe and impurities, anda metal structure comprising, by area ratio,pearlite: 90 to 100%,pseudo pearlite: 0 to 10%, andpro-eutectoid ferrite: 0 to 1%, whereinthe pearlite has an average lamellar spacing of 0.20 μm or less, andthe pearlite has an average pearlite block size of 20.0 μm or less.8. The hot rolled steel sheet according to claim 7 , wherein the chemical composition comprises claim 7 , by mass % claim 7 , one or more ofCu: 0.01 to 1.00%,Ni: 0.01 to 1.00%,Mo: 0.01 to 0.50%,Nb: 0.01 to 0.10%,V: 0.01 to 1.00%,Ti: 0.01 to 1.00%,B: 0.0005 to 0.0100%,Ca: 0.0005 to 0.0050%, andREM: 0.0005 to 0.0050%.9. The hot rolled steel sheet according to claim 7 , wherein the hot rolled steel sheet has a tensile strength of 980 MPa or ...

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Номер записи: 81
03-02-2022 дата публикации

Method of manufacturing a 2xxx-series aluminium alloy plate product having improved fatigue failure resistance

Номер: US20220033937A1
Автор: Achim Burger, Andreas Harald BACH, Philippe Meyer, Sabine Maria Spangel
Принадлежит: ALERIS ROLLED PRODUCTS GERMANY GMBH

A method of manufacturing an AA2xxx-series aluminium alloy plate product having improved fatigue failure resistance and a reduced number of flaws, the method comprising the following steps (a) casting an ingot of an aluminium alloy of the 2xxx-series, the aluminium alloy comprising (in wt. %): Cu 1.9 to 7.0, Mg 0.3 to 1.8, Mn up to 1.2, balance aluminium and impurities, each 0.05 max., total 0.15; (b) homogenizing and/or preheating the cast ingot; (c) hot rolling the ingot into a plate product by rolling the ingot with multiple rolling passes characterized in that, when at an intermediate thickness of the plate between 100 and 200 mm, at least one high reduction hot rolling pass is carried out with a thickness reduction of at least 15%; wherein the plate product has a final thickness of less than 60 mm. The invention is also related to an aluminium alloy product produced by this method.

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Номер записи: 82
03-02-2022 дата публикации

NON-GRAIN ORIENTED ELECTRICAL STEEL AND METHOD FOR MANUFACTURING SAME

Номер: US20220033940A1
Автор: Kim Jae, Kim Jae-Song, Kim Seung Il, Kim Yong-Soo, Shin Su-Yong
Принадлежит:

A non-oriented electrical steel sheet according to an embodiment of the present invention includes: in wt %, C at 0.004 wt % or less (excluding 0 wt %), Si at 2.5 to 4.0 wt %, P at 0.1 wt % or less (excluding 0 wt %), Al at 0.3 to 2.0 wt %, N at 0.003 wt % or less (excluding 0 wt %), S at 0.003 wt % or less (excluding 0 wt %), Mn at 0.15 to 2.5 wt %, Cr at 0.5 wt % (excluding 0 wt %), and the balance including Fe and other impurities unavoidably added thereto; satisfies the following Equation 1; and has an average grain size of 20 μm or less. 1. A non-oriented electrical steel sheet , comprising:in wt %, C at 0.004 wt % or less (excluding 0 wt %), Si at 2.5 to 4.0 wt %, P at 0.1 wt % or less (excluding 0 wt %), Al at 0.3 to 2.0 wt %, N at 0.003 wt % or less (excluding 0 wt %), S at 0.003 wt % or less (excluding 0 wt %), Mn at 0.15 to 2.5 wt %, Cr at 0.5 wt % (excluding 0 wt %), and the balance including Fe and other impurities unavoidably added thereto;satisfying Equation 1 below; and {'br': None, '[Mn]≥1450×[S]−0.8\u2003\u2003[Equation 1]'}, 'having an average grain size of 20 μm or less(in Equation 1, [Mn] and [S] represent a content (wt %) of Mn and S, respectively.)2. The non-oriented electrical steel sheet of claim 1 , further comprisingone or more of Ti at 0.003 wt % or less, Nb at 0.003 wt % or less, and Cu at 0.1 wt % or less.3. The non-oriented electrical steel sheet of claim 1 , wherein{'sup': '2', 'a density of sulfide having a diameter of 1 nm to 0.1 μm is 250,000/mmor less.'}4. The non-oriented electrical steel sheet of claim 3 , whereinthe sulfide includes MnS, MnS, or CuS.5. The non-oriented electrical steel sheet of claim 1 , wherein{'sub': '50', 'a magnetic flux density (B) induced in a magnetic field of 5000 is 1.61 T or more, and the non-oriented electrical steel sheet has a yield strength of 500 MPa or more.'}6. The non-oriented electrical steel sheet of claim 1 , wherein{'sub': '10/400', 'iron loss (W) measured after stress relief annealing that ...

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Номер записи: 83
03-02-2022 дата публикации

HIGH-STRENGTH STAINLESS STEEL

Номер: US20220033941A1
Автор: JEON Jong Jin, KIM Sang Seok, Park Mi-Nam
Принадлежит:

A stainless steel with a yield strength of 2,200 MPa or more is disclosed through the generation of the strain-induced martensite phase and the increase of the martensite phase strength. A high strength stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.14 to 0.20%, Si: 0.8 to 1.0%, Mn: more than 0 and 0.5% or less, Cr: 15.0 to 17.0%, Ni: 4.0 to 5.0%, Mo: 0.6 to 0.8%, Cu: 0.5% or less, N: 0.05 to 0.11%, the remainder of iron (Fe) and other inevitable impurities, and C+N: 0.25% or more and Md30 value satisfies 40° C. or more. 1. A high strength stainless steel comprising , in percent (%) by weight of the entire composition , C: 0.14 to 0.20% , Si: 0.8 to 1.0% , Mn: more than 0 and 0.5% or less , Cr: 15.0 to 17.0% , Ni: 4.0 to 5.0% , Mo: 0.6 to 0.8% , Cu: 0.5% or less , N: 0.05 to 0.11% , the remainder of iron (Fe) and other inevitable impurities , and {'br': None, 'Md30(° C.)=551−462*(C+N)−9.2*Si−8.1*Mn−13.7*Cr−29*(Ni+Cu)−18.5*Mo\u2003\u2003(1)'}, 'C+N: 0.25% or more and Md30 value represented by a following Equation (1) satisfies 40° C. or more.'}(Here, C, N, Si, Mn, Cr, Ni, Cu, Mo mean the content (% by weight) of each element)2. The high strength stainless steel of claim 1 , wherein a Ms value represented by a following Equation (2) satisfies −110° C. or less.{'br': None, 'Ms(° C.)=502−810*C−1230*N−13*Mn−30*Ni−12*Cr−54*Cu−46*Mo\u2003\u2003(2)'}3. The high strength stainless steel of claim 2 , wherein the Ms value represented by the Equation (2) satisfies −117° C. or less claim 2 , or a value of a following Equation (3) satisfies 17.0 or more.{'br': None, 'Ni/(C+N)\u2003\u2003(3)'}4. The high strength stainless steel of claim 1 , wherein a matrix structure comprises claim 1 , as an area fraction claim 1 , a martensite phase of 45% or more claim 1 , a residual austenite phase and ferrite phase claim 1 , andthe ferrite phase is 4% or less.5. The high strength stainless steel of claim 1 , ...

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Номер записи: 84
15-01-2015 дата публикации

Hot-rolled steel sheet and manufacturing method thereof

Номер: US20150017471A1
Автор: Hiroshi Shuto, Nobuhiro Fujita, Ryohta Niiya, Shinya Saitoh, Tatsuo Yokoi, Yuuki KANZAWA
Принадлежит: Nippon Steel and Sumitomo Metal Corp

There are provided a high-strength hot-rolled steel sheet securing low-temperature toughness and having excellent stretch flangeability by controlling a structural fraction and a hardness difference among structures, and a manufacturing method thereof. A hot-rolled steel sheet contains: C: 0.01 to 0.2%; Si: 0.001 to 2.5% or less; Mn: 0.10 to 4.0% or less; P: 0.10% or less; S: less than 0.03%; Al: 0.001 to 2.0%; N: less than 0.01%; Ti: (0.005+48/14[N]+48/32[S]) % or more and 0.3% or less; Nb: 0 to 0.06%; Cu: 0 to 1.2%; Ni: 0 to 0.6%; Mo: 0 to 1%; V: 0 to 0.2%; Cr: 0 to 2%; Mg: 0 to 0.01%; Ca: 0 to 0.01%; REM: 0 to 0.1%; and B: 0 to 0.002%, and has: an texture in which, at a central portion of a sheet thickness located between ⅜ to ⅝ thickness positions of the sheet thickness from a surface of the steel sheet, an average value of X-ray random intensity ratios of a group of {100}<011> to {223}<110> orientations of a sheet plane is 6.5 or less and an X-ray random intensity ratio of a {332}<113> crystal orientation is 5.0 or less; and a microstructure in which a total area ratio of tempered martensite, martensite and lower bainite is more than 85%, and an average crystal grain diameter is 12.0 m or less.

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Номер записи: 85
19-01-2017 дата публикации

HIGH FORMABILITY DUAL PHASE STEEL

Номер: US20170016087A1
Автор: COMSTOCK ROBERT J., Paraskos George A.
Принадлежит:

To improve the formability of dual phase steels, the martensite phase is tempered. It may form a ferrite-carbide structure. The tempering step occurs after martensite has been formed in the dual phase steel. The tempering step can occur in a box annealing step or it can be performed in a continuous fashion, such as on a continuous annealing, continuous tempering heat treating, or continuous coating line. The tempering step can further comprise a temper rolling on a temper mill after the heating step. 1. A method of improving the formability of a dual phase steel strip comprising ferrite and martensite , the method comprising the step of temper heat treating the dual phase steel strip at a temperature and for a time sufficient to transform at least a portion of the martensite to ferrite and cementite.2. The method of further comprising the step of temper rolling the dual phase steel after the temper heat treating step.3. The method of wherein the temper heat treating step occurs after the strip has been cold rolled.4. The method of wherein the temper heat treating step occurs after the strip has been coated with a coating.5. The method of wherein the temper heat treating step is a box annealing step.6. The method of wherein the temper heat treating step is a continuous temper heating step.7. The method of wherein the continuous temper heating is provided by induction heating.8. A method of improving the formability of a dual phase steel having a nominal tensile strength of 780 MPa comprising the step of temper heat treating the dual phase steel strip at a temperature for a time such that yield x<110 micrometers.9. The method of wherein the yield x<90 micrometers.10. A method of improving the formability of a dual phase steel having a nominal tensile strength of 980 MPa comprising the step of temper heat treating the dual phase steel strip at a temperature for a time such that yield x<100 micrometers.11. The method of claim 10 , wherein the yield x<10 micrometers.12. ...

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Номер записи: 86
21-01-2016 дата публикации

FERRITIC STAINLESS STEEL SHEET EXHIBITING SMALL INCREASE IN STRENGTH AFTER AGING HEAT TREATMENT, AND METHOD OF PRODUCING THE SAME

Номер: US20160017451A1
Автор: HAMADA Junichi, Hansaki Naoto, Ishimaru Eiichiro, Kimura Ken, Yamagishi Akihito
Принадлежит: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION

A ferritic stainless steel sheet exhibiting small increase in strength after aging heat treatment in the present invention contains, by mass %, C: 0.020% or less, Cr: 10.0% to 25.0%, N: 0.020% or less, Sn: 0.010% to 0.50%, and one or more of Ti: 0.60% or less, Nb: 0.60% or less, V: 0.60% or less, and Zr: 0.60% or less so as to satisfy the following Equation (1), in which the difference between stress σ1 (N/mm) after prestrain imparting tensile deformation with 7.5% of strain, and upper yield stress σ2 (N/mm) when the steel sheet is subjected to heat treatment at 200° C. for 30 minutes and then to tension again after the tensile deformation is 8 or less.

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Номер записи: 87
21-01-2016 дата публикации

Thick steel sheet having excellent ctod properties in multilayer welded joints, and manufacturing method for thick steel sheet

Номер: US20160017456A1
Автор: Katsuyuki Ichimiya, Kazukuni Hase, Shigeru Endo, Yusuke TERAZAWA
Принадлежит: JFE Steel Corp

There is provided a thick steel plate having good multipass weld joint CTOD characteristics for low to medium heat input and a method for manufacturing the thick steel plate. A steel plate containing, on a mass percent basis, C: 0.03% to 0.12%, Si: 0.5% or less, Mn: 1.0% to 2.0%, P: 0.015% or less, S: 0.0005% to 0.0050%, Al: 0.005% to 0.060%, Ni: 0.5% to 2.0%, Ti: 0.005% to 0.030%, N: 0.0015% to 0.0065%, O: 0.0010% to 0.0050%, Ca: 0.0005% to 0.0060%, and optionally one or two or more of Cu and the like, wherein Ti/N, Ceq, Pcm, and ACR are in particular ranges, a base material of the plate has an effective grain size of 20 μm or less at half the thickness of the plate, and the plate contains a particular number of complex inclusions at ¼ and ½ of the thickness of the plate, the complex inclusions being composed of a sulfide containing Ca and Mn and an oxide containing Al and having an equivalent circular diameter of 0.1 μm or more. Steel having the composition described above is heated at a particular temperature, is then hot-rolled, and is cooled.

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Номер записи: 88
21-01-2016 дата публикации

HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING THE SAME (AS AMENDED)

Номер: US20160017466A1
Автор: Goto Sota, Shibata Tomoaki
Принадлежит: JFE STEEL CORPORATION

A hot-rolled steel sheet is provided having high strength and excellent toughness and ductility includes a composition that contains, on a mass percent basis, 0.04% or more and 0.15% or less of C, 0.01% or more and 0.55% or less of Si, 1.0% or more and 3.0% or less of Mn, 0.03% or less P, 0.01% or less S, 0.003% or more and 0.1% or less of Al, 0.006% or less N, 0.035% or more and 0.1% or less Nb, 0.001% or more and 0.1% or less of V, 0.001% or more and 0.1% or less Ti, and the balance being Fe and incidental impurities, in which the hot-rolled steel sheet includes a microstructure in which the proportion of precipitated Nb to the total amount of Nb is 35% or more and 80% or less, the volume fraction of tempered martensite and/or tempered bainite having a lath interval of 0.2 μm or more and 1.6 μm or less is 95% or more at a position 1.0 mm from a surface of the sheet in the thickness direction, and the volume fraction of ferrite having a lath interval of 0.2 μm or more and 1.6 μm or less at the center position of the sheet in the thickness direction is 95% or more.

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Номер записи: 89
21-01-2016 дата публикации

Cold-Rolled Flat Steel Product for Deep Drawing Applications and Method for Production Thereof

Номер: US20160017467A1
Автор: Evgeny BALICHEV, Harald Hofmann, José JIMENEZ
Принадлежит: THYSSENKRUPP STEEL EUROPE AG

A cold-rolled flat steel product for deep drawing applications is disclosed, composed of a steel which, in addition to Fe and unavoidable impurities (in % by weight) contains C: 0.008%-0.1%, Al: 6.5%-12%, Nb: 0.1%-0.2%, Ti: 0.15-0.5%, P: <0.1%, S: <0.03%, N: <0.1% and optionally one or more elements from the group of “Mn, Si, REM, Mo, Cr, Zr, V, W, Co, Ni, B, Cu, Ca, N”, provided that Mn: <1%, REM: <0.2%, Si: <2%, Zr: <1%, V: <1%, W: <1%, Mo: <1%, Cr: <3%, Co: <1%, Ni: <2%, B: <0.1%, Cu: <3%, Ca: <0.015%. The ratio is 2.5 ≧% Ti/% Nb ≧1.5, %Ti=Ti content and % Nb=Nb content. For production of such a flat steel product, a steel of appropriate composition is cast to give a pre-product, which is then hot-rolled to hot strip at a hot rolling end temperature of 820-1000° C. The latter is subsequently wound at a winding temperature of up to 750° C., after winding annealed at an annealing temperature of >650-1200° C. for 1-50 h, then cold-rolled in one or more stages with a total cold rolling level of ≧65% to give the cold-rolled flat steel product and finally annealed at 650-850° C.

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Номер записи: 90
21-01-2016 дата публикации

HIGH STRENGTH HOT DIP GALVANISED COMPLEX PHASE STEEL STRIP

Номер: US20160017472A1
Автор: Ennis Bernard Leo
Принадлежит:

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

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Номер записи: 91
21-01-2016 дата публикации

High strength galvanized steel sheet having excellent bendability and weldability, and method of manufacturing the same

Номер: US20160017473A1
Автор: Kohei Hasegawa, Shusaku Takagi
Принадлежит: JFE Steel Corp

A method of manufacturing a galvanized steel sheet includes a two-stage temperature raising process which includes: primary heating the sheet from 200° C. to an intermediate temperature of 500 to 800° C. at a primary average heating rate of 5 to 50° C./second at an excess air ratio of 1.10 to 1.20 maintained up to the intermediate temperature; secondary heating the sheet from the intermediate temperature to an annealing temperature of 730 to 900° C. at a secondary average heating rate of 0.1 to 10° C./second at an excess air ratio of less than 1.10 maintained up to the annealing temperature; holding the sheet to the annealing temperature for 10 to 500 seconds; cooling the sheet to 450 to 550° C. at an average cooling rate of 1 to 30° C./second; and subjecting the sheet to a galvanizing process and, optionally, an alloying process.

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Номер записи: 92
18-01-2018 дата публикации

HIGH-STRENGTH STEEL SHEET AND PRODUCTION METHOD THEREFOR

Номер: US20180016656A1
Автор: Kaneko Shinjiro, Minami Hidekazu, Seto Kazuhiro, Yokota Takeshi
Принадлежит: JFE STEEL CORPORATION

A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 μm or less. An inverse intensity ratio of γ-fiber to α-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of γ-fiber to α-fiber in the martensite and the tempered martensite is 1.00 or more. 213-. (canceled)15. The high-strength steel sheet according to claim 1 , wherein the high-strength steel sheet is a cold-rolled steel sheet.16. The high-strength steel sheet according to claim 14 , wherein the high-strength steel sheet is a cold-rolled steel sheet.17. The high-strength steel sheet according to claim 1 , wherein the high-strength steel sheet comprises a coating or plating on a surface thereof.18. The high-strength steel sheet according to claim 14 , wherein the high-strength steel sheet comprises a coating or plating on a surface thereof.19. The high-strength steel sheet according to claim 17 , wherein the coating or plating is a galvanized coating or plating.20. The high-strength steel sheet according to claim 18 , wherein the coating or plating is a galvanized coating or plating.21. A method for producing the high-strength steel sheet according to claim 1 , the method comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'heating a steel slab comprising the chemical composition as recited in to a temperature range of 1150° C. to 1300° C.;'}subjecting the steel slab to hot rolling with a finisher delivery temperature from 850° C. to 1000° C. to obtain a hot-rolled steel sheet;subjecting the hot-rolled steel sheet to coiling in a temperature range of 500° C. to 800° C.;subjecting the hot-rolled steel sheet to cold rolling at a cold rolling reduction of 40% or more to obtain a cold-rolled steel sheet;subjecting the cold-rolled steel sheet to first heat treatment, whereby the cold-rolled steel sheet is heated to a ...

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Номер записи: 93
18-01-2018 дата публикации

HIGH STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Номер: US20180016657A1
Автор: KIDO Akimasa, KIZU Taro, TADANI Tetsushi, Toyoda Shunsuke
Принадлежит: JFE STEEL CORPORATION

A high strength steel sheet having high strength such as a tensile strength of 780 MPa or more and having excellent blanking workability and stretch flangeability and a manufacturing method therefor are provided. A high strength steel sheet comprises: a chemical composition containing, in mass %, C: 0.05% to 0.30%, Si: 0.6% to 2.0%, Mn: 1.3% to 3.0%, P: 0.10% or less, S: 0.030% or less, Al: 2.0% or less, N: 0.010% or less, and one or more of Ti, Nb, and V: 0.01% to 1.0% each, with a balance being Fe and incidental impurities; a ferrite microstructure of 50% or more in area ratio; an amount of precipitated Fe of 0.04 mass % or more; and a precipitate with a particle size of less than 20 nm, wherein C* and C*satisfy specific conditions. 1. A high strength steel sheet comprising:a chemical composition containing, in mass %,C: 0.05% to 0.30%,Si: 0.6% to 2.0%,Mn: 1.3% to 3.0%,P: 0.10% or less,S: 0.030% or less,Al: 2.0% or less,N: 0.010% or less, andone or more of Ti, Nb, and V: 0.01% to 1.0% each,with a balance being Fe and incidental impurities;a ferrite microstructure of 50% or more in area ratio; anda precipitate with a particle size of less than 20 nm,wherein Fe is precipitated in an amount of 0.04 mass % or more and{'sub': 'p', 'claim-text': [{'br': None, 'C*=([Ti]/48+[Nb]/93+[V]/51+[Mo]/96+[Ta]/181+[W]/184)×12\u2003\u2003(1)'}, {'br': None, 'sub': p', 'p', 'p', 'p', 'p', 'p', 'p, 'C*=([Ti]/48+[Nb]/93+[V]/51+[Mo]/96+[Ta]/181+[W]/184)×12\u2003\u2003(2)'}, {'br': None, 'C*≧0.035\u2003\u2003(3)'}, {'br': None, '−0.015≦[C]−C*≦0.03\u2003\u2003(4)'}, {'br': None, 'sub': 'p', 'C*/C*≧0.3\u2003\u2003(5)'}], 'C* defined by the following Expression (1) and C*defined by the following Expression (2) meet conditions of the following Expressions (3) to (5){'sub': p', 'p, 'where [M] denotes a content of an element M in the high strength steel sheet in mass %, and [M]denotes a content, with respect to the whole high strength steel sheet, of the element M contained in the precipitate ...

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Номер записи: 94
17-01-2019 дата публикации

STEEL SHEET FOR TOOL AND MANUFACTURING METHOD THEREFOR

Номер: US20190017133A1
Автор: JANG JAE HOON, PARK Kyong Su
Принадлежит: POSCO

The invention relates to a steel sheet for tool, and method for manufacturing thereof. An embodiment of the present invention is a steel sheet for a tool comprising 0.4 to 0.6 wt % of C, 0.05 to 0.5 wt % of Si, 0.1 to 1.5 wt % of Mn, 0.05 to 0.5 wt % of V, 0.1 to 2.0 wt % of at least of one or two components selected from the group comprising Ni, Cr, Mo, and combinations thereof, and the balance of Fe and inevitable impurities, with respect to 100 wt % of the total steel sheet, and provides a steel sheet for a tool of which the deviation of Rockwell hardness by the position in the width direction is within 5 HRC, and the ratio of those having a wave height in the longitudinal direction within 20 cm is 90% or more with respect to the wave height per 1 m of the steel sheet comprising the central portion in the longitudinal direction of the steel sheet for a tool. 1. A steel sheet for a tool comprising 0.4 to 0.6 wt % of C , 0.05 to 0.5 wt % of Si , 0.1 to 1.5 wt % of Mn , 0.05 to 0.5 wt % of V , 0.1 to 2.0 wt % of at least of one or two components selected from the group comprising Ni , Cr , Mo , and combinations thereof , and the balance of Fe and inevitable impurities , with respect to 100 wt % of the total steel sheet ,wherein the deviation of Rockwell hardness by the position in the width direction of the steel sheet for a tool is within 5 HRC,wherein the ratio of those having a wave height in the longitudinal direction within 20 cm is 90% or more with respect to the wave height per 1 m of the steel sheet comprising the central portion in the longitudinal direction of the steel sheet for a tool.2. The steel sheet for a tool of claim 1 , wherein the ratio of those having a wave height in the longitudinal direction within 10 cm is 90% or more with respect to the wave height per 1 m of the steel plate comprising the central portion in the longitudinal direction of the steel sheet for a tool.35-. (canceled)6. The steel sheet for a tool of claim 1 , wherein Mn: 0.1 to ...

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Номер записи: 95
17-01-2019 дата публикации

Steel sheet for hardening, hardened member, and method for manufacturing steel sheet for hardening

Номер: US20190017142A1
Автор: Hiroyuki Omori, Sae Hamamoto, Tatsuya Asai
Принадлежит: Kobe Steel Ltd

An aspect of the present invention is a steel sheet for quench hardening, satisfying a prescribed composition and having a Mn concentration satisfying the formula (1): S1+S2<−10×[Mn]+44 (1), where [Mn] is Mn concentration in a steel sheet analyzed by inductively coupled plasma emission spectrography (% by mass); S1 is an area % of the region where the Mn concentration analyzed by an electron beam microprobe analyzer in the structure at a position of ¼ of the steel sheet thickness is two times or more the [Mn]; and S2 is an area % of the region where the Mn concentration analyzed by an electron beam microprobe analyzer in the structure at a position of ¼ of the steel sheet thickness is 0.5 times or less the [Mn].

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Номер записи: 96
17-01-2019 дата публикации

IMPACT RESISTANT HIGH STRENGTH STEEL

Номер: US20190017155A1
Автор: Kingston William R.
Принадлежит:

The present invention describes a novel martensitic steel with iron, nickel, boron, a carbide former, manganese, and carbon. The steel has substantially no cementite, substantially no interstitial carbon and substantially no interstitial nitrogen. There are ordered intermetallics dispersed in the iron and ordered intermetallics clustered at the dislocations. The present invention also describes a method of making high strength steel by alloying steel comprising iron and carbon with a strong carbide former, boron, and titanium, followed by heating the alloy steel to a sufficiently high temperature that the steel transitions to an austenitic, face centered cubic lattice phase and the strong carbide former removes substantially all of the carbon from the crystal lattice by forming a metal carbide other than iron carbide. The alloy steel is then quenched to a quench temperature with a quench faster than still air such that a body centered cubic lattice is formed by displacement, which forms ordered intermetallics in the alloy steel. 1. A martensitic steel comprising:a) iron, at least some of the iron having dislocations,b) less than 10% nickel,c) between 0.0001 and 0.01% boron,d) more than 0.01% carbide former,e) less than 10% manganese,f) carbon, andg) less than 7% of all other elements,wherein the steel has substantially no cementite, substantially no interstitial carbon and substantially no interstitial nitrogen, andwherein there are ordered intermetallics dispersed in the iron and ordered intermetallics clustered at the dislocations.2. The steel of wherein the carbide former comprises vanadium claim 1 , titanium claim 1 , niobium claim 1 , zirconium claim 1 , or a combination thereof.3. The steel of wherein the carbide former is titanium.4. The steel of claim 1 , further comprising more than 0.025% titanium.5. The steel of claim 1 , further comprising more than 0.05% titanium.6. The steel of claim 1 , further comprising more than 0.075% titanium.7. The steel of ...

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Номер записи: 97
17-01-2019 дата публикации

HIGH-STRENGTH STEEL SHEET, HIGH-STRENGTH GALVANIZED STEEL SHEET, METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL SHEET, AND METHOD FOR MANUFACTURING HIGH-STRENGTH GALVANIZED STEEL SHEET

Номер: US20190017156A1
Автор: FURUYA Shinichi, Hasegawa Kohei, Kariya Nobusuke, KAWAMURA Kenji, Ono Yoshihiko
Принадлежит: JFE STEEL CORPORATION

Provided are a high-strength steel sheet having a specified chemical composition, in which a Mn-segregation degree in a region within 100 μm from a surface thereof in a thickness direction is 1.5 or less, in a plane parallel to the surface of the steel sheet in a region within 100 μm from the surface of the steel sheet in the thickness direction, the number of oxide-based inclusion grains having a grain long diameter of 5 μm or more is 1000 or less/100 mm, a proportion of the number of oxide-based inclusion grains having a chemical composition containing alumina of 50 mass % or more, silica of 20 mass % or less, and calcia of 40 mass % or less to the total number of oxide-based inclusions having a grain long diameter of 5 μm or more is 80% or more, a specified metallographic structure, and a TS of 980 MPa or more, a high-strength galvanized steel sheet, and a manufacturing method thereof. 1. A high-strength steel sheet having a chemical composition containing , by mass % ,C: 0.07% to 0.30%,Si: 0.10% to 2.5%,Mn: 1.8% to 3.7%,P: 0.03% or less,S: 0.0020% or less,Sol. Al: 0.01% to 1.0%,N: 0.0006% to 0.0055%,O: 0.0008% to 0.0025%, and the balance being Fe and inevitable impurities,wherein a Mn-segregation degree in a region within 100 μm from a surface of the steel sheet in a thickness direction is 1.5 or less,{'sup': '2', 'in a plane parallel to the surface of the steel sheet in a region within 1.00 μm from the surface of the steel sheet in the thickness direction, the number of oxide-based inclusion grains having a grain long diameter of 5 μm or more is 1000 or less per 100 mm,'}a proportion of the number of oxide-based inclusion grains having a chemical composition containing alumina in an amount of 50 mass % or more, silica in an amount of 20 mass % or less, and calcia in an amount of 40 mass % or less to the total number of oxide-based inclusion grains having a grain long diameter of 5 μm or more is 80% or more,a metallographic structure including, in terms of ...

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Номер записи: 98
16-01-2020 дата публикации

HIGH-STRENGTH HIGH-TOUGHNESS THICK STEEL PLATE AND MANUFACTURING METHOD THEREFOR

Номер: US20200017931A1
Автор: JANG Dea-Young, Kang Mo-Chang
Принадлежит:

The objective of one aspect of the present invention is to provide: a thick steel plate having high strength and high toughness without carrying out accelerated cooling using water cooling, in the manufacturing, by means of a thermomechanical control process (TMCP), of a thick steel having a thickness of 15 mmt and over; and a method for manufacturing the same. 1. A thick steel plate having high-strength and high-toughness , by weight % , comprising:0.02 to 0.10% of carbon (C), 0.6 to 1.7% of manganese (Mn), 0.5% or less of silicon (Si) (excluding 0%), 0.02% or less of phosphorus (P), 0.015% or less of sulfur (S), 0.005 to 0.05% of niobium (Nb), 0.005 to 0.08% of vanadium (V), a balance of iron (Fe) and inevitable impurities, and having a microstructure composed of ferrite and pearlite mixed structures,wherein a grain size of austenite is ASTM grain size number of 10 or more and a grain size of ferrite is ASTM grain size number of 9 or more.2. The thick steel plate having high-strength and high-toughness of claim 1 , wherein the thick steel plate further comprises claim 1 , by weight % claim 1 , one or more of 0.5% or less of Ni and 0.5% or less of Cr.3. The thick steel plate having high-strength and high-toughness of claim 1 , wherein the thick steel plate further comprises claim 1 , by weight % claim 1 , 0.05% or less of Ti.4. The thick steel plate having high-strength and high-toughness of claim 1 , wherein the thick steel plate comprises 85 to 95% of ferrite and 5 to 15% of pearlite by an area fraction.5. The thick steel plate having high-strength and high-toughness of claim 1 , wherein the thick steel plate has a yield ratio (yield strength (MPa)/tensile strength (MPa)) of 80 to 92% claim 1 , and impact toughness at −70° C. of 300 J or more.6. A manufacturing method of a thick steel plate having high-strength and high-toughness claim 1 , by weight % claim 1 , comprising steps of:reheating a steel slab including 0.02 to 0.10% of carbon (C), 0.6 to 1.7% of ...

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Номер записи: 99
16-01-2020 дата публикации

COLD ROLLED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME

Номер: US20200017933A1
Автор: HONDA Yuma, Ono Yoshihiko
Принадлежит:

A cold rolled steel sheet having a high strength, an aging resistance, a high yield ratio and a small anisotropy of tensile strength is obtained by hot rolling and cold rolling a steel material containing in percent by mass C: 0.06-0.14%, Si: less than 0.50%, Mn: 1.6-2.5%, Nb: not more than 0.080% (including 0%), Ti: not more than 0.080% (including 0%), provided that Nb and Ti are contained in an amount of 0.020-0.080% in total, subjecting a cold rolled steel sheet continuous annealing including steps of soaking-annealing at a temperature of 840-940° C. for a holding time of 30-120 seconds, cooling from the soaking temperature to 600° C. at a rate of not less than 5° C./s, retaining in a temperature range of 600-500° C. for 30-300 seconds and then conducting a secondary cooling to apply such a steel structure that martensite is finely dispersed into ferrite base. 110-. (canceled)11. A cold rolled steel sheet havinga chemical composition comprising C: 0.06-0.14 mass %, Si: less than 0.50 mass %, Mn: 1.6-2.5 mass %, P: not more than 0.10 mass %, S: not more than 0.020 mass %, Al: 0.01-0.10 mass %, N: not more than 0.010 mass %, Nb: not more than 0.080 mass % (including 0 mass %), Ti: not more than 0.080 mass % (including 0 mass %), provided that Nb and Ti are contained in an amount of 0.020-0.080 mass % in total, and the remainder being Fe and inevitable impurities,a steel structure that an area ratio of ferrite is not less than 85%; an area ratio of martensite is 3-15%; an area ratio of unrecrystallized ferrite is not more than 5%; an average crystal grain size d of the ferrite is 2-8 μm; and a ratio (L/d) of an average value L (μm) among intervals between martensite grains closest to each other to the average crystal grain size d of the ferrite is 0.20-0.80, and{'sub': D', 'C', 'D', 'C, 'mechanical properties wherein a yield ratio YR in a direction perpendicular to a rolling direction is not less than 0.68 and a ratio (TS/TS) of tensile strength TSin a direction of ...

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Номер записи: 100