Daido Tokushuko Kabushiki Kaisha

Nittan Valve Co., Ltd.

Daido Steel Co., Ltd.

Diado Steel Co., Ltd.

Tomotaka Nagashima

Michio Okabe

Toshiharu Noda

Kiyoshi Okawachi

Shuji Hamano

Disclosed is a method of manufacturing a diesel engine valve for intake and exhaust having good corrosion resistance and increased valve face strength, and therefore, of improved durability. A Ni-base heat resistant alloy of strong precipitation hardening type or an Fe-base heat resistant alloy of the same type is used as the material. The method comprises hot forging to prepare a blank form of the valve to be manufactured, solution treatment, cold processing to form the face part, and age-treating for increasing the hardness of the face part.

Method of manufacturing diesel engine valves

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.

High corrosion resisting alloy for diesel engine valve and method for

High corrosion resisting alloy for diesel engine valve

Improved parts of electronic apparatus made of ferritic free cutting steel, which enjoy high precision in size given by good machinability and free from trouble caused by corrosion of metal due to generation of sulfides. The material steel has an alloy composition consisting essentially of, by weight %, C: up to 0.1%, Si: up to 2.0%, Mn: up to 2.0%, Cr: 19-25% and S: 0.20-0.35% and the balance of Fe and impurities. The parts made by machining can be used without being passivated. The steel may contain, further to the above alloy components, one or more from the following groups: 1) Mo: up to 4.0%; 2) one or more of Pb: up to 0.4%, Bi: up to 0.3%, Te: up to 0.3%, Se: up to 0.4% and Ca: up to 0.3%; 3) one or both of B and Mg: 0.001-0.02%; 4) one or both of Cu and Ni: 0.1-4.0%; 5) one or more of Nb, Ta, Ti, V, W and Al: 0.01-0.50%; and 6) O: 0.01-0.04%.

Parts of electronic devices made of ferritic free cutting stainless steel

A heat resisting steel consists essentially of 0.005-0.20% of C, 0.01-2.0% of Si, 0.1-2.0% of Mn, 20-30% of Ni, 10-20% of Cr, 3.0-4.5% of Ti and 0.1-0.7% of Al with the ratio Ti/Al being 5-20, and the balance being substantially Fe, which is excellent in the tensile properties at the room temperature and 700.degree. C., and the creep rupture properties at the temperature of 700.degree. C.

Growing community of inventors

Tokai, Japan

Tomotaka Nagashima