Aisin Aw Co., Ltd.

Daido Tokushuko Kabushiki Kaisha

Kohki Mizuno

Toshiyuki Morita

Kouji Ohbayashi

Taro Matsukawa

Yutaka Eto

Masaki Kuwabara

The present invention relates to a mechanical part, which is obtained by: processing a steel into a shape of a part, the steel having an alloy composition containing, by weight percent, C: 0.10 to 0.30%, Si: 0.50 to 3.00%, Mn: 0.30 to 3.00%, P: 0.030% or less, S: 0.030% or less, Cu: 0.01 to 1.00%, Ni: 0.01 to 3.00%, Cr: 0.20 to 1.00%, Al: 0.20% or less, N: 0.05% or less, and the remainder of Fe and inevitable impurities, and the alloy composition satisfying the following condition:[Si %]+[Ni %]+[Cu %]&#x2212;[Cr %]&#x3e;0.50,in which [Si %], [Ni %], [Cu %] and [Cr %] represent the concentration of Si, the concentration of Ni, the concentration of Cu and the concentration of Cr in the alloy composition, respectively; subjecting the steel to a carburizing treatment in a vacuum, followed by gradually cooling the steel; and subsequently subjecting the steel to a high-frequency hardening to thereby harden a surface of the steel.

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Anjo, Japan

Kohki Mizuno