Daido Tokushuko Kabushiki Kaisha

Nittan Valve Co., Ltd.

Kiyoshi Okawachi

Toshiharu Noda

Michio Okabe

Tomotaka Nagashima

A high corrosion resisting alloy for use in inlet and exhaust valves of diesel engines which is low in cost and excellent in corrosion resistance and strength, which consists by weight percentage of C.ltoreq.0.1%, Si.ltoreq.1.0%, Mn.ltoreq.1.0%, 25%&lt;Cr.ltoreq.32%, 2.0%&lt;Ti.ltoreq.3.0%, 1.0%.ltoreq.Al.ltoreq.2.0% and the balance being Ni and incidental impurities. The valves for the diesel engines are manufactured through the steps of forging the above-mentioned alloy into near net shapes of the valves, performing aging treatment (after solid solution treatment according to demand), and further enhancing hardness of the valves at their valve faces locally through partial cold forging.

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Tokyo, Japan

Kiyoshi Okawachi