Toyota Jidosha Kabushiki Kaisha

Aichi Steel Works, Ltd.

Nippon Steel Corporation

Nippon Kinzoku Co., Ltd.

Shigetoshi Sugimoto

Shinzi Shibata

Shinji Kato

Yoshio Fuwa

Yorishige Maeda

Hikaru Aoyagi

Tadahiro Koike

Hiroshi Kaede

Shinichi Matsumoto

Mikio Yamanaka

Toshihiro Takada

Keiichi Ohmura

Akihiko Kasahara

Toshiyuki Yashiro

Hisashi Baba

Hiroo Wakiyama

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

A process for producing a metallic catalyst-carrier, comprising the steps of: preparing a steel sheet containing 9.0 to 25.0 wt % Cr and 0.01 to 6.0 wt % Al, plating the steel sheet with Ni at an amount of from 0.3 to 10.0 g/m.sup.2, then plating with Al or Al-alloy at a plated amount defined by the formula; ##EQU1## and with a provision that the thickness of an Al-Fe alloyed layer is controlled to a thickness of 10 .mu.m or less, cold rolling to a rolled thickness of 0.1 mm or less, working to a body of a required form, and heat-treating the body.

Processes for production of metallic catalyst-carrier and catalytic

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Aichi, Japan

Shigetoshi Sugimoto