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    ROLLED ROUND STEEL MATERIAL FOR STEERING RACK BAR, AND STEERING RACK BAR
    2.
    发明申请
    ROLLED ROUND STEEL MATERIAL FOR STEERING RACK BAR, AND STEERING RACK BAR 有权
    用于转向架条的滚动钢材和转向架条

    公开(公告)号：US20160186300A1

    公开(公告)日：2016-06-30

    申请号：US14911804

    申请日：2014-06-18

    申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

    发明人： Makoto EGASHIRA ,  Sadanori HORIKAMI ,  Masashi HIGASHIDA ,  Takahiro OKADA ,  Yutaka NEISHI ,  TATSUYA HASEGAWA ,  Hitoshi MATSUMOTO

    IPC分类号： C22C38/60 ,  C22C38/50 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21B1/16 ,  B21B3/02 ,  B62D3/12 ,  C22C38/54

    CPC分类号： C22C38/60 ,  B21B1/16 ,  B21B3/02 ,  B62D3/12 ,  C21D1/10 ,  C21D1/18 ,  C21D7/06 ,  C21D8/06 ,  C21D9/0075 ,  C21D9/28 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

    摘要： A rolled round steel material for a steering rack bar contains C in an amount of 0.38 to 0.55%, Si in an amount of 1.0% or less, Mn in an amount of 0.20 to 2.0%, S in an amount of 0.005 to 0.10%, Cr in an amount of 0.01 to 2.0%, Al in an amount of 0.003 to 0.10%, B in an amount of 0.0005 to 0.0030%, Ti in an amount of 0.047% or less, Cu in an amount of 0 to 1.0%, Ni in an amount of 0 to 3.0%, Mo in an amount of 0 to 0.50%, Nb in an amount of 0 to 0.10%, V in an amount of 0 to 0.30%, Ca in an amount of 0 to 0.005%, and Pb in an amount of 0 to 0.30%, a remaining portion being constituted by Fe and an impurities, the impurities containing P in an amount of 0.030% or less and N in an amount of 0.008% or less, and has a chemical composition satisfying [3.4N≦Ti≦3.4N+0.02]. The microstructure is constituted by ferrite (F), lamellar pearlite (LP), and cementite (C), and in the latitudinal cross-section, in a region extending from a surface to a position located a distance of ½ the radius therefrom, the average particle diameter of F is 10 μm or less, the area percentage of LP is less than 20%, and the number of pieces of spheroidal cementite (SC) in C is 4×105 pieces/mm2 or more, and, in a central portion, the area percentage of LP is 20% or more and the number of pieces of SC is less than 4×105 pieces/mm2, and in the longitudinal cross-section, the average aspect ratio of F in a region extending from a surface to a position located a distance of ½ the radius therefrom is 3 or more. This steel material has a high base material toughness and good machinability without performing thermal refining.

    摘要翻译： 用于转向齿条的轧制圆钢材料含有C为0.38〜0.55％，Si为1.0％以下，Mn为0.20〜2.0％，S为0.005〜0.10％ ，0.01〜2.0％的Cr，0.003〜0.10％的Al，0.0005〜0.0030％的B，0.047％以下的Ti，0〜1.0％的Cu， ，0〜3.0％的Ni，0〜0.50％的Mo，0〜0.10％的Nb，0〜0.30％的V，0〜0.005％的Ca， ，Pb为0〜0.30％，余量由Fe和杂质构成，杂质含量为0.030％以下，N为0.008％以下，含有化学物质 组成满足[3.4N＆nlE; Ti＆nlE; 3.4N + 0.02]。 微结构由铁素体（F），层状珠光体（LP）和渗碳体（C）构成，并且在横截面中，从表面延伸到位于半径的1/2的位置的区域中， F的平均粒径为10μm以下，LP的面积率小于20％，C中的球状渗碳体（SC）的片数为4×10 5个/ mm 2以上，在中央 部分，LP的面积百分比为20％以上，SC的片数少于4×105个/ mm 2，纵向剖面中，从表面延伸的区域的F的平均长宽比 位于其半径的1/2的距离处的位置为3以上。 该钢材具有高基材韧性和良好的机械加工性，而不进行热精炼。