HOT-DIP GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR
    2.
    发明申请
    HOT-DIP GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR 审中-公开
    热镀锌钢板及其生产方法

    公开(公告)号:US20140220383A1

    公开(公告)日:2014-08-07

    申请号:US14131957

    申请日:2012-08-01

    IPC分类号: C23C2/02 C23C2/06

    摘要: Provided are a high-strength hot-dip galvanized steel sheet having excellent formability and a tensile strength of 440 MPa or more and a method for manufacturing the same. A steel sheet has a microstructure containing a ferrite phase having an area fraction of 60% or more, a pearlite phase having an area fraction of 20% to 30%, and a bainite phase having an area fraction of 1% to 5%, the area fraction of a cementite phase present in a grain of the ferrite phase being 5% or less. Upon manufacture, a hot-rolled sheet or a cold-rolled sheet is heated to a temperature of 650° C. or higher at an average heating rate of 10° C./s or more, is held at a temperature of 700° C. to (Ac3-5)° C. for ten seconds or more, is cooled to a temperature of 300° C. to 500° C. at an average cooling rate of 10° C./s to 200° C./s, is held at a temperature of 300° C. to 500° C. for 30 seconds to 300 seconds, and is then hot-dip galvanized.

    摘要翻译: 本发明提供一种成型性,拉伸强度为440MPa以上的高强度热浸镀锌钢板及其制造方法。 钢板具有含有面积率为60%以上的铁素体相,面积率为20%〜30%的珠光体相和面积分数为1%〜5%的贝氏体相的微结构, 存在于铁素体相的晶粒中的渗碳体相的面积率为5%以下。 制造时,将热轧板或冷轧板以平均加热速度10℃/ s以上加热到650℃以上的温度,保持在700℃ 至(Ac3-5)℃10秒以上,以10℃/秒至200℃/秒的平均冷却速度冷却至300℃至500℃的温度 在300〜500℃的温度下保持30秒〜300秒,然后进行热浸镀锌。