| 摘要 |
A rolling bearing has an inner race, an outer race and a roller, at least one of the inner race, outer race and roller being made with an alloy steel consisting of two or more of 0.2 to 1.7% by weight of Mn, 0.2 to 1.2% by weight of Si, 0.2 to 1.7% by weight of Cr, 0.1 to 0.3% by weight of Mo and 0.1 to 1.0% by weight of Ni, 0.4 to 0.7% by weight of C and the balance of Fe, and by subjecting the alloy steel to carburizing hardening to obtain (a) an additional carbon content at the surface portion of 0.35 to 0.6% by weight and (b) a dissolved carbon content at the surface portion of 0.75 to 1.1% by weight, and having: (c) a hardness at the core portion as HRC of 57 to 64 and (d) a difference in hardness between the surface portion and the core portion within +/-5 of HRC.
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