PROBLEM TO BE SOLVED: To propose an Fe-Ni-Cr-Mo alloy having excellent corrosion resistance and strength when receiving a thermal effect and a method for producing the Fe-Ni-Cr-Mo alloy.;SOLUTION: An Fe-Ni-Cr-Mo alloy contains, in mass%, C: 0.005-0.03%, Si: 0.02-0.70%, Mn: 0.01-1.50%, P: 0.010-0.050%, S: 0.002% or less, Ni: 30.0-32.0%, Cr: 26.0-28.0%, Mo: 3.0-4.0%, N: 0.01-0.10%, Al: 0.015-0.20%, and further contains Cu: 0.7-1.4% and/or Co: 0.003-0.30% with the balance being Fe and inevitable impurities, satisfying the following (1), (2) formulae. 0.8≤[%Cu]+15×[%Co]≤5.5 (1). 2.1≤100×[%Al]+66.7×[%N]≤22.7 (2). There is also provided a method for producing the alloy that includes annealing a hot-rolled steel plate or cold-rolled steel plate produced by conventional methods at 1100-1190°C.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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