Aisin Takaoka Co., Ltd.

Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Katsuji Nakashima

Shinichi Suzuki

Toshimasa Tomokiyo

Masashi Ozawa

Shuuji Souma

Kiyohito Kondou

The high-strength quenched formed body contains a layer, in which Zn is a major component and which is formed of Fe: 30% by mass or less, in an amount of 30 g/mor more on the surface of an after-quenching formed-body steel material, and accordingly is good in corrosion resistance. A quenched formed body is produced by quenching a zinc-plated steel material, which includes a zinc-plated layer which contains each of Al and Si having alloying-retarding function and readily-oxidizing function independently or compositely, in an amount of 0.15% by mass or more, after heating it to 800&#xb0; C. or more and 950&#xb0; C. or less in an oxidizing atmosphere of oxygen: 0.1% by volume or more.

High-strength quenched formed body with good corrosion resistance

A high-strength quenched formed body containing a layer on the surface of an after-quenching formed-body steel material in which layer Zn is a major component and which layer contains 30% by mass or less of Fe, and which layer is present in an amount of 30 g/mor more. A quenched formed body is produced by quenching a zinc-plated steel material which includes a zinc-plated layer containing each of Al and Si having alloying-retarding function and readily-oxidizing function independently or compositely, in an amount of 0.15% by mass or more, after heating it to 800&#xb0; C. or more and 950&#xb0; C. or less in an oxidizing atmosphere containing 0.1% by volume or more of oxygen.

High-strength quenched formed body with good corrosion resistance and process for producing the same

Growing community of inventors

Toyota, Japan

Katsuji Nakashima