| 摘要 |
Either the outer or the inner race of a bearing is made from C; 0.5 to 0.65%, Si; 0.07 to 0.15%, Mn; 0.05 to 0.35%, Cr; 0.25 to 0.55%, and B; 0.0035% or less, balance Fe, having Hv 230 in maximum hardness where the high-frequency hardened steel is subjected to hot forging.
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