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    COLD ROLLED AND ANNEALED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME
    1.
    发明申请
    COLD ROLLED AND ANNEALED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME 审中-公开

    公开(公告)号：WO2022018567A1

    公开(公告)日：2022-01-27

    申请号：PCT/IB2021/056243

    申请日：2021-07-12

    申请人： ARCELORMITTAL

    发明人： PERLADE, Astrid ,  ZHU, Kangying ,  KEGEL, Frédéric

    IPC分类号： C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/14 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/22 ,  C22C38/32 ,  C22C38/38

    摘要： The invention deals with a cold rolled and annealed steel sheet, made of a steel having a composition comprising, by weight percent: C: 0.03 - 0.18 % Mn: 6.0 – 11.0 % Al: 0.2 – 3% Mo: 0.05 - 0.5 % B: 0.0005 – 0.005% S ≤ 0.010 % P ≤ 0.020 % N ≤ 0.008 % and comprising optionally one or more of the following elements, in weight percentage: Si ≤ 1.20 % Ti ≤ 0.050 % Nb ≤ 0.050 % Cr ≤ 0.5 % V ≤ 0.2 % the remainder of the composition being iron and unavoidable impurities resulting from the smelting, said steel sheet having a microstructure comprising, in surface fraction, - from 25% to 55% of retained austenite, - from 45% to 75% of ferrite, - less than 5% of fresh martensite, - a carbon [C]A and manganese [Mn]A content in austenite, expressed in weight percent, such that the ratio ([C]A x [Mn]²A) / (C% x Mn%) is from 19.0 to 41.0 wt%, C% and Mn% being the nominal values in carbon and manganese in weight % and - a carbides density below 3x106/mm² and - an inhomogeneous repartition of manganese characterized by a manganese distribution with a slope above or equal to -30.

    METHOD OF MANUFACTURING OF A STEEL PART
    3.
    发明申请
    METHOD OF MANUFACTURING OF A STEEL PART 审中-公开

    公开(公告)号：WO2023285867A1

    公开(公告)日：2023-01-19

    申请号：PCT/IB2021/056448

    申请日：2021-07-16

    申请人： ARCELORMITTAL

    发明人： FORT, Pierrick ,  NADLER, Aude ,  ZHU, Kangying ,  PERLADE, Astrid ,  SOLER, Michel ,  KEGEL, Frédéric

    IPC分类号： C21D1/26 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/22 ,  C22C38/38 ,  C22C38/34

    摘要： The invention deals with a process for manufacturing a steel part, comprising the following successive steps: providing a steel sheet having a composition comprising by weight percent: C: 0.05 – 0.25 %, Mn: 3.5 – 8 %, Si 0.1 - 2%, Al: 0.01 - 3%, S ≤ 0.010 %, P ≤ 0.020 %, N ≤ 0.008 %, and comprising optionally one or more of the following elements, in weight percentage: Cr: 0 – 0.5%, Mo : 0 – 0.25%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure comprising, in surface fraction, between 10% and 50% of retained austenite, 50% or more of the sum of ferrite, bainite and tempered martensite, less than 5% of fresh martensite, less than 2% of carbides and a carbon [C]A content in austenite, strictly more than 0.4% and strictly less than 0.7%, cutting said steel sheet to a predetermined shape, so as to obtain a steel blank, heating the steel blank to a temperature Twarm comprised from (Md30-150°C) to (Md30-50°C), punching or shearing and forming the heat-treated steel blank at the said Twarm temperature to obtain a steel part.

    COLD ROLLED AND ANNEALED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME
    7.
    发明申请
    COLD ROLLED AND ANNEALED STEEL SHEET AND METHOD OF MANUFACTURING THE SAME 审中-公开

    公开(公告)号：WO2022018562A1

    公开(公告)日：2022-01-27

    申请号：PCT/IB2021/056233

    申请日：2021-07-12

    申请人： ARCELORMITTAL

    发明人： PERLADE, Astrid ,  ZHU, Kangying ,  KEGEL, Frédéric ,  REMY, Blandine

    IPC分类号： C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/14 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/22 ,  C22C38/32 ,  C22C38/38

    摘要： The invention deals with a cold rolled and annealed steel sheet, made of a steel having a composition comprising, by weight percent: C: 0.03 - 0.18 % Mn: 6.0 – 11.0 % Al: 0.2 – 3% Mo: 0.05 - 0.5 % B: 0.0005 – 0.005% S ≤ 0.010 % P ≤ 0.020 % N ≤ 0.008 % and comprising optionally one or more of the following elements, in weight percentage: Si ≤ 1.20 % Ti ≤ 0.050 % Nb ≤ 0.050 % Cr ≤ 0.5 % V ≤ 0.2 % the remainder of the composition being iron and unavoidable impurities resulting from the smelting, said steel sheet having a microstructure comprising, in surface fraction, - from 30% to 55% of retained austenite, - from 45% to 70% of ferrite, - less than 5% of fresh martensite - a carbon [C]A and manganese [Mn]A content in austenite, expressed in weight percent, satisfying [C]A* [Mn]A / ((0,1+C%²)*(Mn%+2)) ≥1.10 - and an inhomogeneous repartition of manganese characterized by a manganese distribution with a slope above or equal to -30.