Daido Steel Co., Ltd.

Tomoki Hanyuda

Toshiyuki Morita

Disclosed is a carburized machine part which is free from the problem of decreased strength at edge-shaped parts due to excess introduction of carbon. The machine part is produced by processing a case hardening steel of the alloy composition consisting essentially of, by weight %, C: 0.1-0.3%, Si: 0.5-3.0%, Mn: 0.3-3.0%, P: up to 0.03%, S: up to 0.03%, Cu: 0.01-1.00%, Ni: 0.01-3.00%, Cr: 0.3-1.0%, Al: up to 0.2% and N: up to 0.05% and the balance of Fe and inevitable impurities, and satisfying the following condition:[Si %]+[Ni %]+Cu %]&#x2212;[Cr %]&#x3e;0.5and carburizing by vacuum carburization.

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Aichi, Japan

Tomoki Hanyuda