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    STEEL WIRE FOR HIGH-STRENGTH SPRING
    2.
    发明公开
    STEEL WIRE FOR HIGH-STRENGTH SPRING 有权
    STAHLDRAHTFÜREINE HOCHFESTE FEDER

    公开(公告)号：EP2453033A1

    公开(公告)日：2012-05-16

    申请号：EP10797220.0

    申请日：2010-07-09

    申请人： Nippon Steel Corporation ,  Suzuki Metal Industry Co., Ltd. ,  Honda Motor Co., Ltd.

    发明人： HASHIMURA, Masayuki ,  DEMACHI, Hitoshi ,  KISU, Takayuki ,  SUZUKI, Shoichi ,  SUEHIRO, Motonobu ,  KAWAGUCHI, Jun ,  MAEKAWA, Keiichi ,  MURAKAMI, Atsushi

    IPC分类号： C22C38/00 ,  C22C38/34 ,  C21D8/06 ,  C21D9/52 ,  F16F1/02

    CPC分类号： C22C38/34 ,  C21D6/008 ,  C21D8/065 ,  C21D9/52 ,  C21D2211/001 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24

    摘要： High strength steel wire for spring containing, by mass%, C: 0.67% to less than 0.75%, Si: 2.0 to 2.5%, Mn: 0.5 to 1.2%, Cr: 0.8 to 1.3%, V: 0.03 to 0.20%, Mo: 0.05 to 0.25%, W: 0.05 to 0.30%, and N: 0.003 to 0.007%, having a total of contents of Mn and V of 0.70%≤Mn+V≤1.27% and a total of contents of Mo and W of 0.13%≤Mo+W≤0.35%, limiting P: 0.025% or less, S: 0.025% or less, and Al: 0.003% or less, and having a balance of iron and unavoidable impurities, having a microstructure comprised of, by volume percent, over 6% to 15% of retained austenite and tempered martensite, having a prior-austenite grain size number of 10 or more, having a density of presence of spheroidal carbides with a circle equivalent diameter of 0.2 to 0.5 µm of 0.06 particles/µm 2 or less, having a density of presence of spheroidal carbides with a circle equivalent diameter of over 0.5 µm of 0.01 particles/µm 2 or less, and having a tensile strength of 2100 to 2350 MPa.

    摘要翻译： 弹性高强度钢丝以质量％计含有C：0.67〜0.75％，Si：2.0〜2.5％，Mn：0.5〜1.2％，Cr：0.8〜1.3％，V：0.03〜0.20％ Mo：0.05〜0.25％，W：0.05〜0.30％，N：0.003〜0.007％，Mn和V的含量总和为0.70％‰Mn+ V‰×1.27％，Mo含量 W为0.13％≤Mo+ W‰±0.35％，限制P：0.025％以下，S：0.025％以下，Al：0.003％以下，余量由铁和不可避免的杂质构成，具有 具有以体积％计超过6％至15％的残留奥氏体和回火马氏体的组织，具有先前奥氏体晶粒度为10或更大的具有圆形当量直径为0.2至 0.5μm的0.06粒子/μm2以下，具有0.01当量/μm2以下的圆当量直径超过0.5μm的球状碳化物的密度，并且拉伸强度为2100〜2350MPa。