利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

18 条记录 (耗时 0.013 秒)

    A METHOD OF MANUFACTURING MARTENSITIC STEEL AND A MARTENSITIC STEEL THEREOF
    1.
    发明申请
    A METHOD OF MANUFACTURING MARTENSITIC STEEL AND A MARTENSITIC STEEL THEREOF 审中-公开

    公开(公告)号：WO2020109918A1

    公开(公告)日：2020-06-04

    申请号：PCT/IB2019/059833

    申请日：2019-11-15

    申请人： ARCELORMITTAL

    发明人： GHASSEMI-ARMAKI, Hassan ,  PATEL, Vikas Kanubhai ,  GUSTAFSON, Timothy

    IPC分类号： C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C21D9/50 ,  B21B15/00

    摘要： A martensitic steel comprising of the following elements, expressed in percentage by weight 0.1%≦C≦0.4%; 0.2%≦Mn≦2%; 0.4%≦Si≦2%; 0.2%≦Cr≦1%; 0.01%≦Al≦1%; 0%≦S≦0.09%; 0%≦P≦0.09%; 0%≦N≦0.09%; and can contain one or more of the following optional elements 0%≦Ni≦1%; 0%≦Cu≦1%; 0%≦Mo≦0.1%; 0%≦Nb≦0.1%; 0%≦Ti≦0.1%; 0%≦V≦0.1%; 0.0015%≦B≦0.005%; 0%≦Sn≦0.1%; 0%≦Pb≦ 0.1%; 0% ≦ Sb≦ 0.1%; 0% ≦ Ca≦ 0.1%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel having microstructure by area percentage comprising of cumulative presence of residual austenite and bainite between 0 % and 25%, the remaining microstructure being martensite at least 70%, and with an optional presence of ferrite between 0% and 10%.

    METHOD FOR PRODUCING A HIGH STRENGTH STEEL SHEET HAVING HIGH DUCTILITY, FORMABILITY AND WELDABILITY, AND OBTAINED STEEL SHEET
    8.
    发明申请
    METHOD FOR PRODUCING A HIGH STRENGTH STEEL SHEET HAVING HIGH DUCTILITY, FORMABILITY AND WELDABILITY, AND OBTAINED STEEL SHEET 审中-公开

    公开(公告)号：WO2018202916A1

    公开(公告)日：2018-11-08

    申请号：PCT/EP2018/061722

    申请日：2018-05-07

    申请人： ARCELORMITTAL

    发明人： VENKATASURYA, Pavan C ,  CHAKRABORTY, Anirban ,  GHASSEMI-ARMAKI, Hassan

    IPC分类号： C21D6/00 ,  C23C2/02 ,  C21D9/46 ,  C22C38/02

    摘要： The method comprises providing a cold-rolled sheet, with a composition containing: 0.15% ≤ C ≤ 0.23%, 1.4 % ≤ Mn ≤ 2.6%, 0.6% ≤ Si ≤ 1.3%, with C+Si/10 ≤ 0.30%, 0.4% ≤ Al ≤ 1.0%, with Al ≥ 6(C+Mn/10) – 2.5%, 0.010% ≤ Nb ≤ 0.035%, 0.1% ≤ Mo ≤ 0.5%, annealing the sheet at 860°C-900°C to obtain a structure consisting of at least 90% austenite and at least 2% intercritical ferrite, quenching to a temperature between Ms- 0°C and Ms-60°C at a rate Vc higher than 30°C/s, heating to a temperature PT between 410°C and 470°C for 60s to 130s, hot-dip coating the sheet, and cooling to room temperature. The microstructure comprises 45% to 68% of martensite, consisting of 85% to 95% partitioned martensite having a C content of at most 0.45%, and fresh martensite; 0% to 15% retained austenite; 2% to 10% intercritical ferrite; 20% to 30% lower bainite.