METHOD FOR PRODUCING A HIGH STRENGTH COATED STEEL SHEET HAVING IMPROVED STRENGTH AND DUCTILITY AND OBTAINED SHEET
    2.
    发明申请
    METHOD FOR PRODUCING A HIGH STRENGTH COATED STEEL SHEET HAVING IMPROVED STRENGTH AND DUCTILITY AND OBTAINED SHEET 审中-公开
    生产具有改进强度和坚固性和获得性材料的高强度涂层钢板的方法

    公开(公告)号:WO2016001891A1

    公开(公告)日:2016-01-07

    申请号:PCT/IB2015/055035

    申请日:2015-07-03

    Applicant: ARCELORMITTAL

    Abstract: A method for producing a high strength coated steel sheet having a yield strength YS of at least 800 MPa, a tensile strength TS of > 1180 MPa, a total elongation > 14% and a hole expansion ratio HER > 30%. The steel contains in weight %: 0.13% ≤ C ≤ 0.22%, 1.2% ≤ Si ≤ 1.8%, 1.8% ≤ Mn ≤ 2.2%, 0.10% ≤ Mo ≤ 0.20%, Nb ≤ 0.05%, Al ≤ 0.5%, the remainder being Fe and unavoidable impurities. The sheet is annealed at a temperature TA higher than Ac 3 but less than 1000°C for more than 30 s, then quenched by cooling temperature QT between 325°C and 375°C, at a cooling speed sufficient to obtain a structure consisting of austenite and at least 60% of martensite, the austenite content being such that the final structure can contain between 3% and 15% of residual austenite and between 85 and 97% of the sum of martensite and bainite, without ferrite, then heated to a partitioning temperature PT between 430°C and 480°C and maintained at this temperature for a partitioning time Pt between 10 s and 90 s, then hot dip coated cooled to the room temperature. Coated sheet obtained.

    Abstract translation: 屈服强度YS为800MPa以上,拉伸强度TS> 1180MPa,总伸长率> 14%,孔膨胀率HER> 30%的高强度涂层钢板的制造方法。 钢含有重量%:0.13%≤C≤0.22%,1.2%≤Si≤1.8%,1.8%≤Mn≤2.2%,0.10%≤Mo≤0.2%,Nb≤0.05%,Al≤0.5% 余量为Fe和不可避免的杂质。 片材在高于Ac3但低于1000℃的温度TA下退火30多秒,然后通过冷却温度QT在325℃和375℃之间淬火,以足以获得由奥氏体组成的结构 和至少60%的马氏体,奥氏体含量使得最终结构可以含有3%至15%的残余奥氏体和不含铁素体的马氏体和贝氏体的总和的85%至97%之间,然后加热至分层 温度PT在430℃和480℃之间,并在该温度下保持10秒和90秒之间的分隔时间Pt,然后热浸涂层冷却至室温。 涂层片材。

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