Patent ID: 8071020

Claim:
A high strength Crâ€”Ni alloy material which consists of, by mass percent, C: 0.05% or less, Si: 0.05 to 1.0%, Mn: 0.01% to 1.0%, P: 0.05% or less, S: 0. 005% or less, Cu: 0.1 to 4%, Ni: 25% or more and less than 33%, Cr: 20 to 30%, Mo: 0.01% or more and less than 3.5%, N: 0.10 to 0.30%, Al: 0.10 to 0.30%, O (oxygen): 0.01% or less, and REM (rare earth metal): 0.01 to 0.20%, with the balance being Fe and impurities, and also satisfies the conditions in the following formula (1). NÃ—P /REMâ‰¦0.40â€ƒâ€ƒformula (1) where P, N, and REM in the formula (1) respectively denote the contents (mass %) of P, N, and REM.