公开(公告)号：US20230295757A1

公开(公告)日：2023-09-21

申请号：US18016572

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Frédéric KEGEL

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12

CPC classification number: C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/001 ,  C22C38/002 ,  C22C38/12 ,  C21D2211/005 ,  C21D2211/001 ,  C21D2211/008

Abstract: A cold rolled and double annealed steel sheet, made of a steel having a composition including, by weight percent: C: 0.03-0.18%, Mn: 6.0-11.0%, 0.2≤Al

公开(公告)号：US20230032122A1

公开(公告)日：2023-02-02

申请号：US17784922

申请日：2020-12-17

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG ,  Frédéric KEGEL

IPC: C21D9/46 ,  B21B1/22 ,  C21D8/02 ,  C21D6/00 ,  C21D1/26 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A hot rolled and heat-treated steel sheet having a composition including, by weight percent C 0.12-0.25% Mn 3.0-8.0%, Si 0.70-1.50%, Al 0.3-1.2%, B 0.0002-0.004%, S≤0.010%, P≤0.020%, 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 5% and 45% of ferrite, between 25% and 85% of partitioned martensite, the partitioned martensite having a carbides density less than 2×106 /mm2, between 10% and 30% of retained austenite, less than 8% of fresh martensite, a part of the fresh martensite being combined with retained austenite in the shape of martensite-austenite islands in total surface fraction less than 10%, and a pancaking index lower than 5.

公开(公告)号：US20230002847A1

公开(公告)日：2023-01-05

申请号：US17784848

申请日：2020-12-16

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG ,  Frederic KEGEL

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A cold rolled and heat-treated steel sheet having a composition including, by weight percent C: 0.12-0.25% Mn: 3.0-8.0%, Si: 0.70-1.50%, Al: 0.3-1.2%, B: 0.0002-0.004%, S≤0.010%, P≤0.020%, 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 5% and 45% of ferrite, between 25% and 85% of partitioned martensite, the partitioned martensite having a carbides density strictly less than 2×106/mm2, between 10% and 30% of retained austenite, less than 8% of fresh martensite, a part of the fresh martensite being combined with retained austenite in the shape of martensite-austenite islands in total surface fraction less than 10%.

公开(公告)号：US20230002842A1

公开(公告)日：2023-01-05

申请号：US17784759

申请日：2020-12-16

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG ,  Frédéric KEGEL

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02

Abstract: A hot rolled and annealed steel sheet having a composition including, by weight percent: C: 0.1-0.25%, Mn: 3.00-5.00%, Si: 0.80-1.60%, B: 0.0003-0.004%, S≤0.010%, P≤0.020%, 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: more than 20% of recrystallized ferrite, the balance being non-recrystallized ferrite, more than 15% of said recrystallized ferrite having grain size larger than 5 μm and a density of carbides at grain boundary of recrystallized ferrite less than 5 carbides per 10 μm of grain boundary length

公开(公告)号：US20200149129A1

公开(公告)日：2020-05-14

申请号：US16616937

申请日：2018-06-01

Applicant: ArcelorMittal

Inventor： Martin BEAUVAIS ,  Alice DUMONT ,  Alexandre GIBOT ,  Astrid PERLADE ,  Kangying ZHU

IPC: C21D9/50 ,  C21D9/46 ,  C21D8/04 ,  B32B15/01 ,  C21D6/00 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/32 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00

Abstract: A steel sheet for the manufacture of a press hardened part is provided, having a composition of: 0.15%≤C%≤0.22%, 3.5%≤Mn