METHOD FOR PRODUCING HIGH-STRENGTH Cr-Ni ALLOY SEAMLESS PIPE

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A method for producing a high-strength Cr—Ni alloy seamless pipe comprising preparing an alloy billet with a chemical composition consisting, by mass %, of C : 0.05% or less, Si : 1.0% or less, Mn : less than 3.0%, P : 0.005% or less, S : 0.005% or less, Cu : 0.01 to 4.0%, Ni : 25% or more and less than 35%, Cr : 20 to 30%, Mo : 0.01% or more and less than 4.0%, N : 0.10 to 0.30%, Al : 0.03 to 0.30%, O (oxygen) : 0.01% or less, REM (rare earth metal) : 0.01 to 0.20%, and the balance being Fe and impurities, and satisfying the formula N×P/REM≦0.10, wherein P, N and REM represent the contents (mass %) of P, N and REM, respectively. The pipe is hot worked using cross roll piercing, solution heat treated, and cold worked. The pipe is excellent in hot workability, stress corrosion cracking and does not laminate during cross piercing.