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    High yield ratio-type, hot rolled high strength steel sheet excellent in formability or in both of formability and spot weldability, and production thereof
    3.
    发明授权
    High yield ratio-type, hot rolled high strength steel sheet excellent in formability or in both of formability and spot weldability, and production thereof 失效
    成形性优异，成形性和点焊性均优异的高屈服比型热轧高强度钢板及其制造方法

    公开(公告)号：US5505796A

    公开(公告)日：1996-04-09

    申请号：US107833

    申请日：1993-08-27

    申请人： Osamu Kawano ,  Junichi Wakita ,  Kazuyoshi Esaka ,  Norio Ikenaga ,  Hiroshi Abe

    发明人： Osamu Kawano ,  Junichi Wakita ,  Kazuyoshi Esaka ,  Norio Ikenaga ,  Hiroshi Abe

    IPC分类号： C21D8/02 ,  C21D8/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

    CPC分类号： C21D8/0426 ,  C22C38/02 ,  C22C38/04 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005

    摘要： A high yield ratio-type, hot rolled high strength steel sheet excellent in both formability and spot weldability, containing not less than 5% of retained austenite, and a process for producing the same are provided. The steel sheet contains 0.05 to less than 0.15% by weight or 0.15 to less than 0.30% by weight of C, 0.5 to 3.0% by weight of Si, 0.5 to 3.0% by weight of Mn, more than 1.5 to 6.0% by weight of Si and Mn in total, not more than 0.02% by weight of P, no more than 0.01% by weight of S, and 0.005 to 0.10% by weight of Al, the balance essentially being Fe, and is composed of three phases of ferrite, bainite and retained austenite as a microstructure, and having a ratio (V.sub.F /d.sub.F) of ferrite volume fraction (V.sub.F) to ferrite grain size (d.sub.F) of not less than 20 (not less than 7 in case of 0.15 to less than 0.30% by weight of C), a volume fraction of retained austenite having grain sizes of not more than 2 .mu.m being 5% or more, a yield ratio (YR) of not less than 60%, a strength-ductility balance (tensile strength.times.total elongation) of not less than 2,000 (kgf/mm.sup.2.%), an enlargement ratio (d/d.sub.o) of not less than 1.4 (not less than 1.1 in case of 0.15 to less than 0.30% by weight of C), and a uniform elongation of not less than 15% (not less than 10% in case of 0.15 to less than 0.30% by weight of C).

    摘要翻译： PCT No.PCT / JP92 / 00698 Sec。 371日期：1993年8月27日 102（e）日期1993年8月27日PCT提交1992年5月28日PCT公布。 出版物WO92 / 21784 日本1992年12月10日。具有优异的成形性和点焊性的高屈服比型热轧高强度钢板，其含有不少于5％的残留奥氏体及其制造方法。 钢板含有0.05〜0.15重量％以下或0.15〜0.30重量％的C，0.5〜3.0重量％的Si，0.5〜3.0重量％的Mn，1.5〜6.0重量％ 的Si和Mn总计不超过0.02重量％，不超过0.01重量％的S和0.005至0.10重量％的Al，余量基本上为Fe，并且由三相 铁素体，贝氏体和残余奥氏体作为微结构，并且铁素体体积分率（VF）与铁素体晶粒尺寸（dF）的比（VF / dF）不小于20（在不小于20的情况下不小于7） 0.30重量％的C），晶粒尺寸不大于2μm的残留奥氏体的体积分数为5％以上，屈服比（YR）为60％以上，强度 - 延展性平衡（拉伸强度 强度×伸长率）不小于2000（kgf / mm2。％），增大比（d / do）不小于1.4（在0.15至小于0.30重量％的情况下不小于1.1），以及 一个unif 粒径伸长率不小于15％（在0.15至小于0.30重量％的C的情况下不小于10％）。