| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing steel capable of realizing an excellent rolling fatigue life as a bearing component.SOLUTION: The bearing steel has a chemical composition comprising 0.95 to 1.2% C, 0.15 to 0.35% Si, 0.05 to 0.5% Mn, 0.025% or less P, 0.010% or less S, 0.80 to 1.80% C, above 0.005% to 0.040% Al, 0.0003 to 0.0012% Ca and 0.0010% or less O, and the balance Fe with impurities and satisfying [0.70≤Ca/O≤1.80], [Ca/O≥1250S-5.80] and [20≤Mn/S≤170]. |
