Aichi Steel Works, Ltd.

Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Koyo Seiko K.k.

Takao Ooki

Yoshihiro Wakikado

Akihiro Mizutani

Masao Goto

Toshihiro Kawaguchi

Masayuki Kitamura

Teruo Hoshino

Yoshitaka Natsume

Yatsuka Takata

Hazime Tazumi

Akira Muroga

Itie Nomura

Jun Eguchi

A bearing steel having long rolling life comprising, by weight, 0.65 to 0.90% of C, 0.15 to 0.50% of Si, 0.15 to 1.0% of Mn and 2.0 to 5.0% of Cr, and the balance of Fe. Austenite grain size can be prevented from becoming coarser to make hardening in high temperature possible by further adding one or more of 0.0090 to 0.0200% of N, 0.010 to 0.050% of Al and 0.005 to 0.500% of Nb as optional elements to the steel. Further, rolling fatigue life can be improved by further adding one or more of 0.20 to 0.50% of Ni, 0.10 to 2.00% Of Mo and 0.05 to 1.00% of V as optional elements, and machinability can be improved by further adding one or more of 0.02 to 0.05% of S, 0.005 to 0.10% of rare earth elements, 0.02 to 0.30% of Pb, 0.0005 to 0.0100% of Ca, 0.001 to 0.200% of Bi, 0.005 to 0.20% of Se and 0.005 to 0.100% of Te in the steel as optional elements.

Bearing steel

A free-cutting steel having a high fatigue strength which consists essentially of 0.30-0.50% C, 0.10-0.50% Si, 0.50-1.00% Mn, 0.04-0.12% S, 0.005-0.20% V, 0.005-0.018% Al, 0.05-0.30% Pb, and 0.001-0.006% Ca by weight, and as the remainder, Fe and inevitable impurities. It may additionally contain 0.50% or less of Cr.

Free-cutting steel having high fatigue strength

Case hardened steel and method of manufacturing the same

Growing community of inventors

Chita, Japan

Takao Ooki