| 摘要 |
PROBLEM TO BE SOLVED: To obtain a seamless tube of martensitic stainless steel containing >0.5 wt.% Cu, free from rolling marks occurring at the time of tube making into a seamless tube by the Mannesman rolling process, and excellent in surface quality. SOLUTION: The steel tube has a composition consisting of, by weight, 0.001-0.05% C, <=0.5% Si, 0.1-1.5% Mn, <=0.03% P, <=0.002% S, 10-14% Cr, 2-8% Ni, 0.5-3% Mo, >0.5-3% Cu, <=0.2% Al, 0.001-0.05% N, 0.0005-0.02% B, and <=0.005% O, and further containing, if necessary, one or more of 0.001-0.01% Ca, 0.0005-0.01% Mg, 0.001-0.05% REM, 0.01-0.05% Zr, 0.005-0.05% Ti, 0.05-0.5% Nb, 0.05-0.5% V, 0.5-3% W and the balance Fe with inevitable impurities.
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