| 摘要 |
This invention aims at providing a induction hardened bearing steel which can produce bearing parts at a low cost and can provide excellent rolling fatigue characteristics, the present invention provides a long life high-frequency-hardened bearing steel comprising, in terms of percent by weight, 0.45 to 0.7% of C, 0.05 to 1.7% of Si, 0.35 to 2.0% of Mn, 0.001 to 0.03% of S, 0.01 to 0.07% of A l 0.003 to 0.015% of N, 0.0005 to 0.03% of T.Mg, 0.005 to 1.2% of Mo, a specific amount of at least one member selected from the group consisting of Cr, Ni, V, Nb and B, and more than 0.025% of P, and not more than 0.004% of Ti and not more than 0.002% of T.O, wherein a number ratio of Mg type oxides contained in the steel is at least 0.8. |
