| 摘要 |
PURPOSE:To manufacture a heat resistant member capable of withstanding high temp. and pressure and having improved resistance to stress corrosion cracking by subjecting an Ni alloy material contg. specified amounts of Cr, Fe and Zr to soln. heat treatment at a proper temp. CONSTITUTION:An Ni alloy material contg. 10-20wt% Cr, 4-10wt% Fe and <=0.01wt% Zr or one or more among Mg, Ca and Y is subjected to soln. heat treatment at 1,000-1,100 deg.C. Since sulfide is precipitated in the grains by the addition of Zr or one or more among Mg, Ca and Y, the sulfide is uniformly dispersed to inhibit the segregation of S on the grain boundaries, and a heat resistant member usable well at high temp. and pressure without causing stress corrosion cracking is obtd. The soln. heat treatment is carried out for 10-60min per 1in. thickness of the material. A heat resistant material having much superior resistance to stress corrosion cracking can be obtd. by carrying out age hardening at 690-720 deg.C after the soln. heat treatment.
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