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Sumitomo Metal Industries, Inc.

Takao Kan

Hiroyuki Hirata

Kaori Kawano

Fujimitsu Masuyama

Nobuyoshi Komai

Tomomitsu Yokoyama

Yoshimi Yamadera

Syoji Kinomura

A high strength, low alloy, heat resistant steel having excellent weldability has an average crystal grain diameter of at most 110 &mgr;m and consists essentially of, by mass %: C: 0.03-0.15%, Si: at most 1%, Mn: at most 2%, P: at most 0.03%, S: at most 0.03%, Ni: at most 0.5%, Cu: at most 0.5%, Cr: 1.8-2.8%, V: 0.1-0.3%, Nb: 0.01-0.08%, Mo: 0.05-0.35%, W: 1.2-1.8%, Ti: 0.001-0.05%, B: 0-0.02%, Al: at most 0.1%, O: at most 0.1%, N: in an amount satisfying the formula &lsqb;%N&rsqb;&lE;&lsqb;%Ti&rsqb;&plus;5&lsqb;%B&rsqb;&plus;0.004, and a remainder of unavoidable impurities.

High strength, low alloy, heat resistant steel

An alloy having an excellent corrosion resistance and workability and being suitable particularly for seamless tubes of the industrial waste incineration boiler. The alloy consists essentially of, in weight %,:

Nickel-based alloy excellent in corrosion resistance and workability

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Amagasaki, Japan

Takao Kan