| 摘要 |
A Ni base alloy pipe stock having a chemical composition comprising, by mass %, C<=0.04%, Si<=0.50%, Mn: 0.01 to 6.0%, P<=0.03%, S<=0.01%, Cr: 15 to 30%, Ni: more than 45% to not more than 60%, Mo: 0 to 18%, W: 0 to 36%, with Mo(%)+0.5W(%): more than 1.5% to not more than 18%, Cu: 0.01 to 1.5%, Al<=0.01% and N: 0.0005 to 0.20%, and the balance substantially being Fe, with 1380-5000P-100S-4400C>=1300, Ni+10(Mo+0.5W)+100N<=200, (Ni-50)+10(N-0.1)-2(Cr-25)-5(Mo+0.5W-6)+12>=0, can be manufactured into a seamless pipe by use of a Mannesmann piercing and rolling mill because of its excellent inner surface properties. The resulting seamless pipe has excellent mechanical properties and moreover has excellent corrosion resistance in a sour gas environment, and thus, the Ni base alloy pipe stock can be used as a pipe stock for oil country tubular goods and line pipes and further as a pipe stock for various structural members of nuclear power plants and chemical industrial plants.
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