Nippon Steel Corporation

Japan Atomic Energy Research Institute

Isamu Yamauchi

Susumu Shimamoto

Yasuhiro Nakagawa

Takashi Zaizen

Hideo Nakajima

Setsu Sakamoto

Katsumi Suzuki

Disclosed is a structural austenitic stainless steel with superior proof stress and toughness at cryogenic temperatures. The steel has a composition essentially consisting of, by weight, not greater than 0.05% of carbon, 0.20 to 0.70% of nitrogen, not greater than 1.0% of silicon, not greater than 25% of manganese, 13 to 35% of chromium, 5 to 25% of nickel and the balance substantially iron. The chromium content and manganese content is selected to meet the condition of (Cr+0.9 Mn).gtoreq.20%. The index of cleanliness showing the amount of nonmetallic inclusions is not greater than 0.1%.

Structural austenitic stainless steel with superior proof stress and

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Tokyo, Japan

Isamu Yamauchi