Mitsubishi Jukogyo Kabushiki Kaisha

Sumitomo Metal Industries, Inc.

Takaya Kusakabe

Toshio Yonezawa

Hiroo Nagano

Kazuo Yamanaka

Hiroshi Susukida

Takao Minami

Nobuya Sasaguri

Kichiro Onimura

Mamoru Inoue

Katsuji Kawaguchi

Yaautaka Okada

An alloy for heat transfer pipes excellent in an alkali stress corrosion cracking resistance which is obtained by heating and retaining said alloy at a temperature within the range of a temperature (T.degree.C.), at which a carbide in said alloy is thoroughly solubilized, to T+100.degree. C. for 1 minute or more; cooling it once to a level of 200.degree. C. or less; and carrying out a thermal treatment under conditions within a hatched range Z in FIG. 2, said alloy comprising: in terms of % by weight, 0.15% or less of C; 1.0% or less of Si; 1.0% or less of Mn; 25 to 35% of Cr; 40 to 70% of Ni; 0.5% or less of Al; 0.01 to 1.0% of Ti; 0.5 to 5.0%, in all, of one or more of Mo, W and V; 0.30% or less of P; 0.020% or less of S; and the residue of Fe and impurities.

Method for thermal treatment of alloy for heat transfer pipes

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Kobe, Japan

Takaya Kusakabe