| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a case-hardened steel not only having good cold forgeability but also having high fatigue strength. <P>SOLUTION: A component composition includes, by mass, 0.10 to 0.35% C; 0.01 to 0.50% Si; 0.40 to 1.50% Mn; no more than 0.02% P; no more than 0.03% S; 0.04 to 0.10% Al; 0.5 to 2.5% Cr; 0.0005 to 0.0050% B; 0.003 to 0.080% Nb; no more than 0.003% Ti; and less than 0.0080% N, with the remainder comprising Fe and unavoidable impurities. <P>COPYRIGHT: (C)2011,JPO&INPIT |
