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公开(公告)号：US20240229201A1
公开(公告)日：2024-07-11
申请号：US18010928
申请日：2021-06-30
CPC分类号： C22C38/04 , C21D1/22 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C22C38/02 , C22C38/06 , C23C2/06 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： A steel sheet including a chemical composition satisfying an equivalent carbon content of 0.35% or more and less than 0.60% and a steel microstructure with an area fraction of ferrite: 40% to 85%, tempered martensite and bainite: 10% to 55% in total, retained austenite: 3% to 15%, and ferrite, tempered martensite, bainite, and retained austenite: 93% or more in total. A 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction causes a change of 0.50 or more in (a grain size in a thickness direction)/(a grain size in a direction perpendicular to the thickness) of the tempered martensite in an L cross section in a 0- to 50-μm region from a surface of the steel sheet on a compression side, and the steel sheet has a tensile strength of 590 MPa or more.
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公开(公告)号：US11993823B2
公开(公告)日：2024-05-28
申请号：US16544127
申请日：2019-08-19
IPC分类号： C21D9/46 , B32B15/01 , B32B15/04 , B32B15/18 , C21D1/20 , C21D1/22 , C21D1/25 , C21D1/26 , C21D1/78 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/40 , C22C38/54 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40 , C23C28/02 , C25D3/22 , C25D5/36
CPC分类号： C21D9/46 , B32B15/013 , B32B15/043 , B32B15/18 , C21D1/20 , C21D1/22 , C21D1/25 , C21D1/26 , C21D1/78 , C21D8/0247 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/40 , C22C38/54 , C23C2/0224 , C23C2/06 , C23C2/28 , C23C2/40 , C23C28/021 , C23C28/025 , C25D3/22 , C25D5/36 , C21D8/0236 , C21D8/0278 , C21D2211/001 , C21D2211/005 , C21D2211/008
摘要： The present invention provides steel sheet products having controlled compositions that are subjected to two-step annealing processes to produce sheet products having desirable microstructures and favorable mechanical properties such as high strength and ultra-high formability. The steel sheet products may be cold rolled or hot rolled. Steels processed in accordance with the present invention exhibit favorable combined ultimate tensile strength and total elongation (UTS•TE) properties, and may fall into the category of Generation 3 advanced high strength steels, desirable in various industries including automobile manufacturers.
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公开(公告)号：US20240124950A1
公开(公告)日：2024-04-18
申请号：US18483584
申请日：2023-10-10
申请人： AKTIEBOLAGET SKF
发明人： Daniel Roman WEIMANN , Wijbe BUISING , Pei Yan , Stefan GEERTS
CPC分类号： C21D9/40 , C21D1/20 , C21D1/22 , C21D6/00 , C21D2211/001 , C21D2211/002 , C21D2211/008
摘要： A method for heat treating a steel component includes heating the component to a temperature at or above the austenitizing temperature and holding the component at or above the austenitizing temperature for a time sufficient to at least partially austenitize the steel, cooling the component to a first temperature in a temperature range of 200° C. to 270° C. and holding the component in the temperature range for at most 6 hours, thereby transforming at least a portion of the austenite into bainite, cooling the component to a temperature of from −30° C. to 30° C., thereby forming martensite; and reheating the component to a second temperature in the temperature range, holding the component in the temperature range for at most 6 hours and then cooling the component to a temperature of from −30° C. to 30° C., thereby transforming a further portion of the austenite into bainite and forming tempered martensite.
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84.发明公开公开(公告)号：US20240002994A1
公开(公告)日：2024-01-04
申请号：US18231060
申请日：2023-08-07
发明人： John SPEER , Lijia ZHAO
CPC分类号： C23C2/28 , C21D1/20 , C21D1/22 , C21D2211/008 , C23C2/06 , C21D2211/002 , C22C18/04
摘要： A metallic material with a first microstructure is coated in a bath with a coating to form a coated metallic material. The coating has a liquidus temperature and the bath has an operating temperature that is higher than the liquidus temperature. The first microstructure of the metallic material is altered by the application of the coating to an alternative microstructure. The coating includes a dopant which acts as a temperature reducing agent.
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公开(公告)号：US11692232B2
公开(公告)日：2023-07-04
申请号：US16555102
申请日：2019-11-25
申请人： Gregory Vartanov
发明人： Gregory Vartanov
IPC分类号： C21D6/02 , C21D6/00 , C22C38/50 , C22C38/46 , C22C38/44 , C22C38/30 , C21D1/22 , B22F3/15 , B22F3/24 , B33Y70/00 , B22F9/08 , B22F1/142 , B22F10/20 , B22F10/64 , B22F10/66
CPC分类号： C21D1/22 , B22F1/142 , B22F3/15 , B22F3/24 , B22F9/082 , B22F10/20 , B22F10/64 , B22F10/66 , B33Y70/00 , C21D6/004 , C21D6/02 , C22C38/30 , C22C38/44 , C22C38/46 , C22C38/50 , B22F2301/35 , C21D2211/001 , C21D2211/008 , B22F2998/10 , B22F9/08 , B22F10/20 , B22F10/66 , B22F2003/247 , B22F2003/248
摘要： High strength precipitation hardening stainless steel alloy is disclosed. The steel alloy has a composition by weight %, about: 30.0% max nickel (Ni), 0.0 to 15.0% cobalt (Co), 25.0% max chromium (Cr), 5.0% max molybdenum (Mo), 5.0% max titanium (Ti), 5.0% max vanadium (V), about 0.5% max lanthanum (La) and/or cerium (Ce), and in balance iron (Fe) and inevitable impurities. The steel alloy provides a unique combination of corrosion resistance, strength and toughness and is a material for aircraft landing gears and structures.
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公开(公告)号：US11242583B2
公开(公告)日：2022-02-08
申请号：US16761724
申请日：2018-11-08
发明人： Mai Nagano , Koutarou Hayashi , Akihiro Uenishi
IPC分类号： C22C38/04 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/32 , C21D9/46 , C22C38/58 , C22C38/42 , C22C38/44 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/50 , C22C38/46 , C22C38/54 , C22C38/38 , C22C38/18 , C22C38/24 , C22C38/34 , C22C38/20 , C22C38/48 , C22C38/40 , C21D1/22 , C21D1/18 , C21D8/02
摘要： A steel sheet includes, as a chemical composition, by mass %: C: 0.05-0.30%; Si: 0.2-2.0%; Mn: 2.0-4.0%; Al: 0.001-2.000%; P: 0.100% or less; S: 0.010% or less; N: 0.010% or less; Ti: 0-0.100%; Nb: 0-0.100%; V: 0-0.100%; Cu: 0-1.00%; Ni: 0-1.00%; Mo: 0-1.00%; Cr: 0-1.00%; W: 0-0.005%; Ca: 0-0.005%; Mg: 0-0.005%; a rare earth element (REM): 0-0.010%; B: 0-0.0030%; and a remainder of Fe and impurities, in which a metallographic structure contains, by area ratio, 95% or more of a hard structure and 0-5% of residual austenite, by mass % in a cross section in a thickness direction, C1/C2 which is a ratio of an upper limit C1 of a Mn content to a lower limit C2 of the Mn content is 1.5 or less, and a bake-hardening amount BH is 150 MPa or less.
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公开(公告)号：US20210340643A1
公开(公告)日：2021-11-04
申请号：US17378898
申请日：2021-07-19
发明人： Eiichi OTA , Yasuhiro Yogo , Tomoaki Ihara
摘要： A hot-press molding method of the present disclosure includes a first heating process in which a steel plate is heated and the entire steel plate becomes austenite, a first cooling process in which a cooling rate of the steel plate after the first heating process is partially changed, a first region which is a part of the steel plate is transformed into martensite, and a second region other than the first region remains as austenite, a second heating process in which the entire steel plate is reheated and the first region becomes tempered martensite, and a second cooling process in which the entire steel plate after the second heating process is cooled. At least one of the first cooling process and the second cooling process is performed during a molding process in which the steel plate is press-molded on a molding die.
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公开(公告)号：US20210032713A1
公开(公告)日：2021-02-04
申请号：US16800839
申请日：2020-02-25
发明人： Bohuslav Masek , Ctibor Stadler , Vjaceslav Georgiev , Jiri Hammerbauer , Radek Holota , Martin Jara
摘要： This invention generally relates to a method for producing steel parts by creating multiphase microstructures within the steel parts. Typically, the microstructures comprise low-stress martensite with increased ductility and stabilized retained austenite. The microstructures may be formed by cooling the steel parts to a temperature around the martensite start temperature (Ms) and subsequently holding the steel part at a temperature around the Ms in order to equalize the temperature throughout the steel part. Afterwards, the formation of the microstructures and the desired properties is completed by subjecting the steel part to a final cooling in still air.
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公开(公告)号：US20200040422A1
公开(公告)日：2020-02-06
申请号：US16544127
申请日：2019-08-19
IPC分类号： C21D9/46 , C23C2/02 , C21D1/25 , C21D1/26 , C22C38/00 , C22C38/08 , C22C38/16 , C22C38/18 , C22C38/40 , C22C38/54 , C23C28/02 , C21D1/78 , C21D1/20 , C21D1/22 , B32B15/01 , B32B15/04 , B32B15/18 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C23C2/06 , C23C2/40 , C25D3/22 , C25D5/36
摘要： The present invention provides steel sheet products having controlled compositions that are subjected to two-step annealing processes to produce sheet products having desirable microstructures and favorable mechanical properties such as high strength and ultra-high formability. The steel sheet products may be cold rolled or hot rolled. Steels processed in accordance with the present invention exhibit favorable combined ultimate tensile strength and total elongation (UTS•TE) properties, and may fall into the category of Generation 3 advanced high strength steels, desirable in various industries including automobile manufacturers.
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