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公开(公告)号:US09771643B2
公开(公告)日:2017-09-26
申请号:US14245229
申请日:2014-04-04
申请人: Akihito Ninomiya , Yoshinari Okada , Takahiro Miyazaki , Yasushi Matsumura , Shinichiro Kato , Tetsuya Shimomura
发明人: Akihito Ninomiya , Yoshinari Okada , Takahiro Miyazaki , Yasushi Matsumura , Shinichiro Kato , Tetsuya Shimomura , Katsuya Yamaguchi
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.