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1.发明授权公开(公告)号：US11591665B2
公开(公告)日：2023-02-28
申请号：US16956390
申请日：2018-12-18
Applicant: ArcelorMittal
Inventor： Coralie Jung , Astrid Perlade , Kangying Zhu , Frédéric Kegel
IPC: C01D9/00 , C21D8/00 , C22C38/00 , C23C2/12 , C21D9/46 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/32 , C23C2/06
Abstract: A cold-rolled and heat treated steel sheet, has a composition comprising 0.1%≤C≤0.4%, 3.5%≤Mn≤8.0%, 0.1%≤Si≤1.5%, Al≤3%, Mo≤0.5%, Cr≤1%, Nb≤0.1%, Ti≤0.1%, V≤0.2%, B≤0.004%, 0.002%≤N≤0.013%, S≤0.003%, P≤0.015%. The structure consists of, in surface fraction: between 8 and 50% of retained austenite, at most 80% of intercritical ferrite, the ferrite grains, if any, having an average size of at most 1.5 μm, and at most 1% of cementite, the cementite particles having an average size lower than 50 nm, martensite and/or bainite.
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公开(公告)号：US11920208B2
公开(公告)日：2024-03-05
申请号：US16954510
申请日：2018-12-18
Applicant: ArcelorMittal
Inventor： Coralie Jung , Astrid Perlade , Kangying Zhu , Frédéric Kegel
IPC: C21D9/46 , B23K11/16 , B32B15/01 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C23C2/02 , C23C2/06 , C23C2/12 , C23C2/28 , C23C2/40 , B23K101/00
CPC classification number: C21D9/46 , B23K11/16 , B32B15/012 , B32B15/013 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C23C2/02 , C23C2/0224 , C23C2/06 , C23C2/12 , C23C2/29 , C23C2/40 , B23K2101/006 , C21D2211/001 , C21D2211/003 , C21D2211/005 , C21D2211/008
Abstract: A cold-rolled and heat-treated steel sheet, has a composition comprising, by weight percent: n0.10%≤C≤0.25%, 3.5%≤Mn—≤6.0%, 0.5%≤Si≤2.0%, 0.3%≤Al≤1.2%, with Si+Al≥0.8%, 0.10%≤Mo≤0.50%, S≤0.010%, P≤0.020%, N≤0.008%. The cold-rolled steel sheet has a microstructure consisting of, in surface fraction: between 10% and 45% of ferrite, having an average grain size of at most 1.3 μm, the product of the surface fraction of ferrite by the average grain size of the ferrite being of at most 35 μm %, between 8% and 30% of retained austenite, the retained austenite having an Mn content higher than 1.1*Mn %, Mn % designating the Mn content of the steel, at most 8% of fresh martensite, at most 2.5% of cementite and partitioned martensite.
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公开(公告)号：US11530459B2
公开(公告)日：2022-12-20
申请号：US16765207
申请日：2018-11-21
Applicant: ArcelorMittal
Inventor： Kangying Zhu , Astrid Perlade , Coralie Jung , Frederic Kegel
IPC: C21D9/46 , C21D8/02 , B23K20/12 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C23C2/06 , C23C2/12
Abstract: A cold-rolled and heat-treated steel sheet having a microstructure of, in surface fraction: between 10% and 30% of retained austenite, said retained austenite being present as films having an aspect ratio of at least 3 and as Martensite Austenite islands, less than 8% of such Martensite Austenite islands having a size above 0.5 μm, at most 10% of fresh martensite and recovered martensite containing precipitates of at least one element chosen among niobium, titanium and vanadium. A manufacturing method thereof is also provided.
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4.发明授权
公开(公告)号：US11965225B2
公开(公告)日：2024-04-23
申请号：US18097492
申请日：2023-01-16
Applicant: ArcelorMittal
Inventor： Coralie Jung , Astrid Perlade , Kangying Zhu , Frédéric Kegel
IPC: C21D9/46 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/32 , C23C2/06 , C23C2/12
CPC classification number: C21D9/46 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0273 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/32 , C23C2/06 , C23C2/12 , C21D2211/001 , C21D2211/003 , C21D2211/005 , C21D2211/008
Abstract: A cold-rolled and heat treated steel sheet, has a composition comprising 0.1%≤C≤0.4%, 3.5%≤Mn≤8.0%, 0.1%≤Si≤1.5%, Al≤3%, Mo≤0.5%, Cr≤1%, Nb≤0.1%, Ti≤0.1%, V≤0.2%, B≤0.004%, 0.002%≤N≤0.013%, S≤0.003%, P≤0.015%. The structure consists of, in surface fraction: between 8 and 50% of retained austenite, at most 80% of intercritical ferrite, the ferrite grains, if any, having an average size of at most 1.5 μm, and at most 1% of cementite, the cementite particles having an average size lower than 50 nm, martensite and/or bainite.
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公开(公告)号：US11530461B2
公开(公告)日：2022-12-20
申请号：US16766328
申请日：2018-11-21
Applicant: ArcelorMittal
Inventor： Kangying Zhu , Astrid Perlade , Coralie Jung , Frederic Kegel
IPC: C21D1/18 , C21D6/00 , C21D8/02 , C21D9/46 , B23K11/11 , B23K11/16 , B32B15/01 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D1/25 , C21D9/48 , C22C38/14 , C22C38/16 , C23C2/12 , C21D8/04 , C22C38/38 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/34 , C22C38/18 , C21D1/34 , C21D1/26 , B32B15/04 , B32B15/18 , C23C2/26 , C23C2/40 , C23C30/00 , B23K101/00 , C23C2/06
Abstract: A cold-rolled and heat-treated steel sheet having a microstructure consisting of, in surface fraction: between 10% and 30% of retained austenite, the retained austenite being present as films having an aspect ratio of at least 3 and as Martensite Austenite islands, less than 8% of the Martensite Austenite islands having a size above 0.5 μm, at most 1% of fresh martensite, at most 50% of tempered martensite, and recovered martensite containing precipitates of at least one element chosen among niobium, titanium and vanadium. A method for manufacturing the cold-rolled and heat-treated steel sheet is also described.
