Toyota Jidosha Kabushiki Kaisha

Aichi Steel Works, Ltd.

Hiroshi Kaede

Shinji Kato

Yoshio Fuwa

Yorishige Maeda

Hikaru Aoyagi

Shinzi Shibata

Shigetoshi Sugimoto

Tadahiro Koike

A steel having good wear resistance which contains 0.55-1.10% of C, up to 2.0% of Si, up to 2.0% of Mn, 12.0-25.0% of Cr and particularly suitable as a material for piston rings or rocker arms. Further addition of 0.05-1.10% of Al to the above steel gives a steel improved in properties for spheroidization of carbides and uniformization of carbide particle size, leading to further enhancement of wear resistance. If required 0.20-2.0% of Ni may be added to the steels, whereby corrosion resistance, toughness and hardenability are improved. An addition of at least one of 0.2-3.0% of Mo, 0.1-1.5% of V and 0.05-0.70% of Nb to the steels improves high-temperature strength and surface hardness. The steel is surface treated by gas nitriding of the like in a surface area for sliding contact with an opponent member.

Steel having good wear resistance

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Nagoya, Japan

Hiroshi Kaede