Japan Atomic Energy Research Institute

Mitsubishi Kinzoku Kabushiki Kaisha

Japan Atomic Energy Res. Institute

Masami Shindo

Tatsuo Kondo

Hajime Nakajima

Ryohei Tanaka

Hirokazu Tsuji

Sadao Ohta

Rikizo Watanabe

Susumu Isobe

Taizo Ohmura

Noboru Yonezawa

Toshio Kojima

Watanabe Rikizo

Susumi Isobe

Akira Kawagoe

The improved superalloy that possesses all the characteristics required of the high-temperature structural material of high-temperature gas-cooled reactors (i.e., high-temperature strength, corrosion resistance, good producibility, good hot workability and resistance to embrittlement due to thermal aging) consists essentially of 16-28% Cr, 15-24% W (provided that Cr+W=39-44%), 0.01-0.1% Zr, 0.001-0.015% Y, 0.0005-0.01% B, up to 0.05% C, up to 0.1% Si, up to 0.1% Mn (provided that Si+Mn.ltoreq.0.1%), up to 0.1% Ti, up to 0.1% Al and up to 0.1% Nb (provided that Ti+Al.ltoreq.0.1% and Ti+Al+Nb.ltoreq.0.15%), with the balance being Ni and inevitable impurities and all percentages being on a weight basis.

Nickel-chromium-tungsten base superalloy

The improved superalloy that possesses all the characteristics required of the high-temperature structural material of high-temperature gas-cooled reactors (i.e., high-temperature strength, corrosion resistance, good productibility, good hot workability and resistance to embrittlement due to thermal aging) consists essentially of 16-28% Cr. 15-24% W (provided that Cr+W=39-44%), 0.01-0.1% Zr, 0.001-0.015% Y, 0.0005-0.01% B, up to 0.05% C, up to 0.1% Si, up to 0.1% Mn (provided that Si+Mn.gtoreq.0.1%), up to 0.1% Ti, up to 0.1% Al and up to 0.1% Nb (provided that Ti+Al.gtoreq.0.1% and Ti+Al+Nb.gtoreq.0.15%), with the balance being Ni and inevitable impurities and all percentages being on a weight basis.

A nickel-base alloy excellent in corrosion resistance at high temperatures, which consists essentially of, in weight percentage:

Nickel-base alloy excellent in corrosion resistance at high temperatures

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Ibaraki, Japan

Masami Shindo