| 摘要 |
PURPOSE:To produce a precipitation strenthening type Ni-base alloy by subjecting an alloy having the compsn. consisting of C, Si, Mn, Fe, Cr, Ti, Nb, Al, P, S, N, Ni, etc. to hot working and heat treatment under adequate conditions. CONSTITUTION:An alloy having the compsn. consisting of <=0.05% C, <=0.50% Si, <=1.0% Mn, 5.0-10.0% Fe, <=(18-30%) Cr, <=0.50% Ti, 2.0-5.0% Nb, <=0.40% Al, <=0.015% P, <=0.005% S, <=0.03% N and further, if necessary, consisting of <=7.0% Mo and/or <=0.1% total of at least one kind among REM, Mg, Ca and Y and the balance Ni (but at least >=50%) is subjected to hot working of >=50% draft at 800-1,200 deg.C and after the alloy is held for 5min-5.0hr at 1,000-1,200 deg.C, the alloy is cooled at a cooling rate of air cooling or above and is then subjected to >=1 time of an aging heat treatment for 1.0-150hr at 550-800 deg.C. The precipitation strengthening type Ni-base alloy having excellent resistance to stress corrosion cracking under high-temp. and high-pressure water environment is obtd.
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