Zn-Al-Mg BASED ALLOY HOT-DIP PLATED STEEL SHEET, AND METHOD FOR PRODUCING THE SAME
    4.
    发明申请
    Zn-Al-Mg BASED ALLOY HOT-DIP PLATED STEEL SHEET, AND METHOD FOR PRODUCING THE SAME 有权
    Zn-Al-Mg基合金热镀锌钢板及其制造方法

    公开(公告)号:US20130337287A1

    公开(公告)日:2013-12-19

    申请号:US14001928

    申请日:2012-02-28

    IPC分类号: B60R13/00 C23C2/02

    摘要: [Problem] To provide a steel sheet hot-dip-plated with a Zn—Al—Mg-based alloy coating, which is remarkably improved in point of all the burring workability, the liquid metal embrittlement cracking resistance and the corrosion resistance in the welded part thereof, as a steel material favorable for arc-welded structural members.[Means for Resolution] A plated steel sheet having a Zn—Al—Mg-based alloy coating layer formed by hot-dipping on the surface of a base steel sheet for welded structural members, wherein the base steel sheet has a specific chemical composition and has a metallographic structure of such that Ti-containing precipitates having a mean particle diameter of at most 20 nm are dispersed in the matrix formed of a ferrite phase therein, and wherein the liquid metal embrittlement cracking sensitivity index H3 value of the base steel sheet represented by the following formula (3) and indicating the relationship between the contents of the steel components and the thickness t (mm) of the steel sheet is at most 2.90: H3 Value=C/0.2+Si/5.0+Mn/1.3+Cr/1.0+Mo/1.2+0.4t−0.7(Cr+Mo)1/2  (3)

    摘要翻译: [问题]为了提供热浸镀Zn-Al-Mg基合金涂层的钢板,其在所有的加工加工性方面都得到显着改善,焊接中的液态金属脆化抗裂性和耐腐蚀性 作为有利于电弧焊结构体的钢材。 [解决方法]将具有Zn-Al-Mg系合金被覆层的电镀钢板热浸镀在用于焊接结构件的基体钢板的表面上,其中,所述基体钢板具有特定的化学组成, 具有使平均粒径为20nm以下的含Ti析出物分散在由铁素体相形成的基体中的金相组织,其中,所述基体钢板的液态金属脆化裂纹敏感性指数H3值 通过以下公式(3)表示钢构件的含量与钢板的厚度t(mm)之间的关系为2.90以下:H3值= C / 0.2 + Si / 5.0 + Mn / 1.3 + Cr /1.0+Mo/1.2+0.4t-0.7(Cr+Mo)1/2(3)