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    ROLLED ROD STEEL FOR HOT FORGING, HOT-FORGED ROUGHLY SHAPED MATERIAL, AND COMMON RAIL AND PROCESS FOR PRODUCING SAME
    2.
    发明公开
    ROLLED ROD STEEL FOR HOT FORGING, HOT-FORGED ROUGHLY SHAPED MATERIAL, AND COMMON RAIL AND PROCESS FOR PRODUCING SAME 审中-公开
    WÄLZDRAHTSTAHL温锻BY温锻GROB成形的材料和普通铁路和方法及其生产

    公开(公告)号：EP2816131A1

    公开(公告)日：2014-12-24

    申请号：EP13749063.7

    申请日：2013-02-05

    申请人： Nippon Steel & Sumitomo Metal Corporation ,  Denso Corporation

    发明人： MATSUI, Naoki ,  HIGASHIDA, Masashi ,  MATSUMOTO, Hitoshi ,  NEISHI, Yutaka ,  MAKINO, Taizo ,  MORITA, Kouji ,  TANIMURA, Yoshihiro ,  SASHIMA, Naoyuki ,  ITOU, Toshimasa

    IPC分类号： C22C38/00 ,  C22C38/12 ,  C22C38/58 ,  C21D8/06

    摘要： A rolled steel bar for hot forging consisting, by mass percent, of C: 0.25-0.50%, Si: 0.40-1.0%, Mn: 1.0-1.6%, S: 0.005-0.035%, Al: 0.005-0.050%, V: 0.10-0.30%, and N: 0.005-0.030%, and the balance of Fe and impurities, the contents of P and O in the impurities being P: 0.035% or less and O: 0.0030% or less, and value represented by Fn1 = C + Si/10 + Mn/5 + 5Cr/22 + 1.65V - 5S/7 being 0.90 to 1.20, wherein the predicted maximum width of nonmetallic inclusions at the time when a cumulative distribution function obtained by extreme value statistical processing by taking the width of nonmetallic inclusion in an R 1 /2 part of a longitudinal cross section of the rolled steel bar as W (µm) is 99.99% is 100 µm or narrower; and the number density of sulfides each having a circle-equivalent diameter of 0.3 to 1.0 µm observed per unit area of the R 1 /2 part of a transverse cross section of the rolled steel bar is 500 pieces/mm 2 or higher;
    where, the symbol of an element in Formula (i) represents the content (mass%) of the element.

    摘要翻译： 甲轧制棒钢热锻由......组成，以质量％计，C的：0:25至12：50％以下，Si：0.40-1.0％以下，Mn：1.0-1.6％，S：0005-0035％以下，Al：0005-0050％，V ：0:10至12：30％，N：从0005至0030％，和Fe和杂质的平衡，P和O中的杂质的含量为P：0.035％以下和O：0.0030％以下，和值由代表 FN1 = C +的Si / 10 +的Mn / 5 + 5CR / 22 + 1.65V - 5S / 7为0.90〜1.20，worin非金属夹杂物的预测最大宽度在时间当累积分布函数所获得由极值统计处理 以非金属夹杂物的宽度在轧制棒钢作为W（微米）的纵向横截面的A R 1/2的部分是99.99％为100微米或更窄; 和具有每轧制棒钢的一个横截面中的R 1/2部分的单位面积的观察0.3〜1.0微米的当量圆直径的每个硫化物的数密度为500个/ mm 2或更高; 其中，元件的在通式（i）的符号darstellt的元素的含量（质量％）。