公开(公告)号：US20140299234A1

公开(公告)日：2014-10-09

申请号：US14245229

申请日：2014-04-04

申请人： Shinichiro KATO ,  Takahiro MIYAZAKI ,  Yoshinari OKADA ,  Akihito NINOMIYA ,  Tetsuya SHIMOMURA ,  Yasushi MATSUMURA

发明人： Akihito NINOMIYA ,  Yoshinari OKADA ,  Takahiro MIYAZAKI ,  Yasushi MATSUMURA ,  Shinichiro KATO ,  Tetsuya SHIMOMURA ,  Katsuya YAMAGUCHI

IPC分类号： C23C8/22 ,  C23C8/02

CPC分类号： C23C8/22 ,  C23C8/02 ,  C23C8/80

摘要： The invention provides a carburized part which has excellent medium-cycle fatigue strength in particular subjected to surface-hardening treatment by carburization. The invention provides a carburized part including a carburized layer formed by performing carburizing treatment to a steel, the steel including, in terms of % by mass: 0.15% to 0.25% of C, 0.15% or less of Si, 0.4% to 1.1% of Mn, 0.8% to 1.4% of Cr, 0.25% to 0.55% of Mo, 0.015% or less of P, and 0.035% or less of S, with the remainder being Fe and unavoidable impurities, and the steel satisfying the following relation; 0.10≦[Mo]/(10[Si]+[Mn]+[Cr])≦0.40, in which [M] represents a content of element M in terms of % by mass.

摘要翻译： 本发明提供一种具有优异的中等循环疲劳强度的渗碳部件，特别是通过渗碳进行表面硬化处理。 本发明提供一种渗碳部分，其包括通过对钢进行渗碳处理而形成的渗碳层，所述钢以质量％计含有：0.15〜0.25％的C，0.15％以下的Si，0.4〜1.1％ 的Mn，0.8〜1.4％的Cr，0.25〜0.55％的Mo，0.015％以下的P和0.035％以下的S，余量为Fe和不可避免的杂质，满足以下关系的钢 ; 0.10＆nlE; [Mo] /（10 [Si] + [Mn] + [Cr]）＆nlE; 0.40，其中[M]表示元素M的含量，以质量％计。