| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing steel component whose rolling fatigue life is improved compared with the conventional one. SOLUTION: The steel component for a bearing having excellent fatigue properties is composed of a steel stock having a componential composition comprising, by mass, 0.6 to 1.5% C, 0.1 to 1.0% Si, 0.1 to 1.5% Mn and 0.05 to 2.0% Cr, and the balance Fe with inevitable impurities, and in which the expected maximum diameter of inclusions in the steel is≤8μm, and also, the average retained austenite grain diameter in the quenched surface layer part after quenching is≤3.5μm. COPYRIGHT: (C)2008,JPO&INPIT
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