| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a Ni-based heat-resistant alloy weld joint that has an excellent anti-crack property in a heat affected zone, and to provide a weld joint.SOLUTION: The method for manufacturing a Ni-based heat-resistant alloy weld joint is provided in which an alloy base metal that has a chemical composition containing, by mass%, C: 0.03 to 0.12%, Si: 1% or less, Mn: 1% or less, P: 0.015% or less, S: 0.005% or less, Co: 8 to 25%, Cr: 18 to 27%, Ti: 0.1 to 2.5%, Al: 0.2 to 2.0%, B: 0.0001 to 0.01%, REM: 0.001 to 0.5%, N: 0.02% or less, O: 0.01% or less, Ca: 0 to 0.05%, Mg: 0 to 0.05%, Fe: 0 to 15%, Mo: 0 to 12%, W: 0 to 10%, Cu: 0 to 4%, Nb: 0 to 2.5%, V: 0 to 0.5%, and the balance Ni and impurities and that has been used under the condition that heating holding temperature T(°C) in use and heating holding time t(h) in use satisfy [600≤T≤850] and [1700≤T×(1.0+log t)], is subjected to heat treatment under the condition that a heat treatment holding temperature T(°C) and heat treatment holding time t(h) satisfy [1050≤T≤1250] and [-0.1×(T/50-30)≤t≤-0.1×(T/10-145)], then the alloy base metal is welded.SELECTED DRAWING: None |
