| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a carbonitrided bearing steel superior in rolling fatigue life to those prepared by applying carbonitriding treatment to conventional steels represented by SUJ2, SCr420 and SCM420 even under debris-contaminated environments. <P>SOLUTION: The carbonitrided bearing steel has a composition consisting of, by weight, 0.1 to 0.4% C,≤1.0% Si, >1.5 to 3% Mn,≤0.03% P,≤0.03% S, 0.3 to 2.5% Cr, 0.005 to 0.050% Al,≤0.003% Ti,≤0.0015% O,≤0.025% N and the balance Fe with inevitable impurities. In the steel, surface hardness after carbonitriding treatment or subsequent secondary quench-and-temper treatment is≥58 HRC and the amount of surface retained austenite is 20 to 50% . <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
