HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL WELL, AND METHOD FOR PRODUCING SAME

摘要

Provided are a high-strength stainless steel seamless pipe or an oil well, and a method for producing the same. This high-strength stainless steel seamless pipe for an oil well has a component composition which satisfies a predetermined formula and which contains, in terms of mass%, 0.002-0.05% C, 0.05-0.50% Si, 0.04-1.80% Mn, no more than 0.030% P, no more than 0.002% S, more than 14.0% and no more than 17.0% Cr, 4.0-8.0% Ni, 1.5-3.0% Mo, 0.005-0.10% Al, 0.005-0.20% V, 0.01-1.0% Co, 0.002-0.15% N, and no more than 0.006% O, the remainder comprising Fe and unavoidable impurities, and the high-strength stainless steel seamless pipe for an oil well has a structure in which the average diameter of prior austenite grains is 40 µm or less, and the yield strength thereof is 758 MPa or greater.