STEEL PARTS FOR MACHINE STRUCTURE, MATERIAL THEREFOR, AND METHOD FOR MANUFACTURE THEREOF
    6.
    发明公开
    STEEL PARTS FOR MACHINE STRUCTURE, MATERIAL THEREFOR, AND METHOD FOR MANUFACTURE THEREOF 有权
    STAHLTEILEFÜREINE MASCHINENKONSTRUKTION,材料DAFÜRUND HERSTELLUNGSVERFAHRENDAFÜR

    公开(公告)号:EP1669469A1

    公开(公告)日:2006-06-14

    申请号:EP04747934.0

    申请日:2004-07-16

    IPC分类号: C22C38/00 C21D8/00 C21D9/28

    摘要: The present invention provides a machine structural part composed of 0.3% to 0.7% of C, 0.30% or less of Si, 0.2% to 2.0% of Mn, 0.005% to 0.25% of Al, 0.005% to 0.1% of Ti, 0.05% to 0.6% of Mo, 0.0003% to 0.006% of B, 0.06% or less of S, 0.020% or less of P, 0.0030% or less of O on a mass basis, and the balance being Fe and unavoidable impurities. In addition, the machine structural part has a hard layer on at least a part of a surface thereof formed by induction quenching, an average prior austenite grain diameter of the hard layer is 7 µm or less, and the maximum diameter of a non-metal inclusion composed of oxides is 15 µm or less. Since having a high fatigue strength, this machine structural part is suitable for an automobile drive shaft, constant velocity joint, and the like.

    摘要翻译: 本发明提供一种机械结构部件,其由C:0.3%〜0.7%,Si:0.30%以下,Mn:0.2〜2.0%,Al:0.005〜0.25%,Ti:0.005〜0.1% Mo:0.000〜0.006%,S:0.06%以下,P:0.020%以下,O:0.0030%以下,余量为Fe和不可避免的杂质。 此外,机械结构部件在其通过感应淬火形成的表面的至少一部分上具有硬质层,硬质层的平均先前的奥氏体晶粒直径为7μm以下,非金属的最大直径 由氧化物构成的夹杂物为15μm以下。 由于具有高的疲劳强度,该机械结构部件适用于汽车传动轴,等速万向节等。