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    STEEL FOR MECHANICAL STRUCTURES
    2.
    发明公开
    STEEL FOR MECHANICAL STRUCTURES 审中-公开

    公开(公告)号：EP3480333A1

    公开(公告)日：2019-05-08

    申请号：EP17824224.4

    申请日：2017-07-04

    申请人： Nippon Steel & Sumitomo Metal Corporation

    发明人： HASHIMURA, Masayuki ,  EGASHIRA, Makoto ,  IWAHASHI, Takanori ,  TOUDOU, Shouji

    IPC分类号： C22C38/00 ,  C22C38/60 ,  B22D11/00 ,  B22D11/124

    摘要： A steel for machine structural use is provided which is excellent in machinability, rusting characteristics, and hot ductility. The steel for machine structural use according to the present embodiment has a chemical composition which consists of, in mass%, C: 0.30 to 0.80%, Si: 0.01 to 0.80%, Mn: 0.20 to 2.00%, P: 0.030% or less, S: 0.010 to 0.100%, Pb: 0.010 to 0.100%, Al: 0.010 to 0.050%, N: 0.015% or less and O: 0.0005 to 0.0030%, with the balance being Fe and impurities, the chemical composition satisfying Formula (1). The total number of specific inclusions included in the steel which are any of MnS inclusions, Pb inclusions and composite inclusions containing MnS and Pb and which have an equivalent circular diameter of 5 µm or more is 40 per mm 2 or more. Mn / S ≥ 8.0 Where, a content (mass%) of a corresponding element is substituted for each symbol of an element in Formula (1).

    STEEL FOR MACHINE STRUCTURES
    6.
    发明公开
    STEEL FOR MACHINE STRUCTURES 审中-公开

    公开(公告)号：EP3492615A1

    公开(公告)日：2019-06-05

    申请号：EP17834454.5

    申请日：2017-07-27

    申请人： Nippon Steel & Sumitomo Metal Corporation

    发明人： HASHIMURA, Masayuki ,  EGASHIRA, Makoto ,  TOUDOU, Shouji ,  IWAHASHI, Takanori

    IPC分类号： C22C38/00 ,  B22D11/124 ,  C21C7/00 ,  C21C7/04 ,  C22C38/60

    摘要： A steel for machine structural use is provided which is excellent in machinability, rusting characteristics, and hot ductility, and with which carburized components that are excellent in rolling contact fatigue properties are obtained. The steel for machine structural use according to the present embodiment has a chemical composition which consists of, in mass%, C: 0.15 to less than 0.30%, Si: 0.01 to 0.80%, Mn: 0.20 to 2.00%, P: 0.030% or less, S: 0.010 to 0.100%, Pb: 0.010 to 0.100%, Al: 0.010 to 0.050%, N: 0.015% or less, O: 0.0005 to 0.0030% and Cr: 0.50 to 2.00%, with the balance being Fe and impurities, the chemical composition satisfying Formula (1). The total number of specific inclusions included in the steel which are any of MnS inclusions, Pb inclusions and composite inclusions containing MnS and Pb and which have an equivalent circular diameter of 5 µm or more is 40 per mm 2 or more. Mn / S ≥ 8.0
    Where, a content (mass%) of a corresponding element is substituted for each symbol of an element in Formula (1).

    STEEL FOR MACHINE STRUCTURES
    7.
    发明公开
    STEEL FOR MACHINE STRUCTURES 审中-公开

    公开(公告)号：EP3492614A1

    公开(公告)日：2019-06-05

    申请号：EP17834453.7

    申请日：2017-07-27

    申请人： Nippon Steel & Sumitomo Metal Corporation

    发明人： HASHIMURA, Masayuki ,  EGASHIRA, Makoto ,  IWAHASHI, Takanori ,  TOUDOU, Shouji

    IPC分类号： C22C38/00 ,  B22D11/124 ,  C21C7/00 ,  C21C7/04 ,  C22C38/60

    摘要： A steel for machine structural use is provided which is excellent in machinability and rusting characteristics, and with which machine components that are excellent in rolling contact fatigue properties are obtained. The steel for machine structural use according to the present embodiment has a chemical composition which consists of, in mass%, C: 0.30 to 0.50%, Si: 0.01 to 0.80%, Mn: 0.20 to 2.00%, P: 0.030% or less, S: 0.010 to 0.100%, Pb: 0.010 to 0.100%, Al: 0.010 to 0.050%, N: 0.015% or less, O: 0.0005 to 0.0030% and Cr: more than 0.70% to 2.00%, with the balance being Fe and impurities, the chemical composition satisfying Formula (1). The total number of specific inclusions included in the steel which are any of MnS inclusions, Pb inclusions and composite inclusions containing MnS and Pb and which have an equivalent circular diameter of 5 µm or more is 40 per mm 2 or more. Mn / S ≥ 8.0
    Where, a content (mass%) of a corresponding element is substituted for each symbol of an element in Formula (1).

    ROLLED ROUND STEEL MATERIAL FOR STEERING RACK BAR, AND STEERING RACK BAR
    8.
    发明公开
    ROLLED ROUND STEEL MATERIAL FOR STEERING RACK BAR, AND STEERING RACK BAR 有权
    用于转向架杆的滚动圆钢材料和转向架杆

    公开(公告)号：EP3040435A1

    公开(公告)日：2016-07-06

    申请号：EP14839024.8

    申请日：2014-06-18

    申请人： Nippon Steel & Sumitomo Metal Corporation

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

    IPC分类号： C22C38/00 ,  C22C38/38 ,  C22C38/58 ,  C21D8/06

    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 1/2 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 4×10 5 pieces/mm 2 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 4×10 5 pieces/mm 2 , 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 1/2 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含有0.38〜0.55％的C，1.0％以下的Si，0.20〜2.0％的Mn，0.005〜0.10％的S， ，Cr：0.01〜2.0％，Al：0.003〜0.10％，B：0.0005〜0.0030％，Ti：0.047％以下，Cu：0〜1.0％ ，Ni 0〜3.0％，Mo 0〜0.50％，Nb 0〜0.10％，V 0〜0.30％，Ca 0〜0.005％ ，Pb：0〜0.30％，剩余部分由Fe和杂质构成，含有P：0.030％以下，N：0.008％以下的杂质，具有化学式 组成满足[3.4N≤Ti≤3.4N+ 0.02]。 微观组织由铁素体（F），层状珠光体（LP）和渗碳体（C）构成，并且在横向截面中​​，在从表面延伸到距半径距离为1/2的位置的区域 ，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）的个数为4×10 5个/ mm 2以上， 中心部分，LP的面积百分比为20％以上，SC的数量小于4×105个/ mm2，纵向截面中的F的平均纵横比从 位于与其半径的1/2的距离的位置的表面为3或更大。 这种钢材不需要进行热精炼就具有高基材韧性和良好的机械加工性。