| 摘要 |
An inner ring 3 of the rolling bearing is formed by a steel material having the following composition. This steel material contains as alloying constituents C, Si, Mn and Cr in an amount of from 0.65 to 1.20% by weight, from 0.10 to 0.70% by weight, from 0.20 to 1.20% by weight and from 0.20 to 1.80% by weight, respectively, and has an oxygen content of not more than 16 ppm. The content of retained austenite left after heat treatment is from 0 to 6% by volume and the surface hardness HRC of the bearing surface is from not less than 57 to not more than 65. Accordingly, it is possible to drastically prolong the lifetime of a rolling bearing operating under high vibration and load such as bearing for alternator.
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