High-strength steel sheet and method for manufacturing the same
    3.
    发明授权
    High-strength steel sheet and method for manufacturing the same 有权
    高强度钢板及其制造方法

    公开(公告)号:US08840834B2

    公开(公告)日:2014-09-23

    申请号:US12865542

    申请日:2009-01-29

    IPC分类号: C22C38/04 C21D8/02 C22C38/14

    摘要: An ultra-high strength steel sheet has a tensile strength of 1400 MPa or higher that can achieve both high strength and good formability and an advantageous method for manufacturing the steel sheet and includes a composition including, on a mass basis C: 0.12% or more and 0.50% or less; Si: 2.0% or less; Mn: 1.0% or more and 5.0% or less; P: 0.1% or less; S: 0.07% or less; Al: 1.0% or less; and N: 0.008% or less, with the balance Fe and incidental impurities. The steel microstructure includes, on an area ratio basis, 80% or more of autotempered martensite, less than 5% of ferrite, 10% or less of bainite, and 5% or less of retained austenite; and the mean number of precipitated iron-based carbide grains each having a size of 5 nm or more and 0.5 μm or less and included in the autotempered martensite is 5×104 or more per 1 mm2.

    摘要翻译: 超高强度钢板的拉伸强度为1400MPa以上,能够实现高强度和良好的成形性,并且制造钢板的优选方法包括以质量计C:0.12%以上的组合物 和0.50%以下; Si:2.0%以下; Mn:1.0%以上且5.0%以下; P:0.1%以下; S:0.07%以下; Al:1.0%以下; 和N:0.008%以下,余量为Fe和杂质。 所述钢微观结构以面积比为基准,具有80%以上的自回火马氏体,小于5%的铁素体,10%以下的贝氏体和5%以下的残留奥氏体, 并且包含在自回火马氏体中的尺寸为5nm以上且0.5μm以下的析出铁素体的平均粒子数为5×104以上。

    HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
    5.
    发明申请
    HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME 有权
    高强度钢板及其制造方法

    公开(公告)号:US20110048589A1

    公开(公告)日:2011-03-03

    申请号:US12865542

    申请日:2009-01-29

    摘要: An ultra-high strength steel sheet has a tensile strength of 1400 MPa or higher that can achieve both high strength and good formability and an advantageous method for manufacturing the steel sheet and includes a composition including, on a mass basis C: 0.12% or more and 0.50% or less; Si: 2.0% or less; Mn: 1.0% or more and 5.0% or less; P: 0.1% or less; S: 0.07% or less; Al: 1.0% or less; and N: 0.008% or less, with the balance Fe and incidental impurities. The steel microstructure includes, on an area ratio basis, 80% or more of autotempered martensite, less than 5% of ferrite, 10% or less of bainite, and 5% or less of retained austenite; and the mean number of precipitated iron-based carbide grains each having a size of 5 nm or more and 0.5 μm or less and included in the autotempered martensite is 5×104 or more per 1 mm2.

    摘要翻译: 超高强度钢板的拉伸强度为1400MPa以上,能够实现高强度和良好的成形性,并且制造钢板的优选方法包括以质量计C:0.12%以上的组合物 和0.50%以下; Si:2.0%以下; Mn:1.0%以上且5.0%以下; P:0.1%以下; S:0.07%以下; Al:1.0%以下; N:0.008%以下,余量为Fe和杂质。 所述钢微观结构以面积比为基准,具有80%以上的自回火马氏体,小于5%的铁素体,10%以下的贝氏体和5%以下的残留奥氏体, 并且包含在自回火马氏体中的尺寸为5nm以上且0.5μm以下的析出铁素体的平均粒子数为5×104以上。