Long-life induction-hardened bearing steel

Details Long-life induction-hardened bearing steel Long-life induction-hardened bearing steel

C - Chemistry, Metallurgy

22

C

C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C22C 38/40 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2181918

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 0.039% of S, 0.01 to 0.07% of A? 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.

Acier pour roulements trempé par induction et à longue durée de vie, capable de produire, à faible coût, des parties de roulement présentant une excellente résistance à la fatigue. Ledit acier contient, sur une base en poids, 0,45 à 0,7 % de C, 0,05 à 1,7 % de Si, 0,35 à 2 % de Mn, 0,001 à 0,03 % de S, 0,01 à 0,07 % de Al, 0,003 à 0,015 % de N, 0,0005 à 0,03 % de T.Mg, éventuellement 0,05 à 1,2 % de Mo, éventuellement une quantité spécifiée d'au moins un élément choisi parmi Cr, Ni, V, Nb et B, au plus 0,025 % de P, au plus 0,004 % de Ti et au plus 0,002 % de T.O, et possède une teneur en particules d'oxyde de magnésium de 0,8 ou plus.

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