Martensitic stainless seamless steel pipe for oil country tubular goods and method for producing the same

摘要

Provided are a martensitic stainless seamless steel pipe for oil country tubular goods having high strength and excellent resistance to sulfide stress corrosion cracking, and a method for producing the same. % By mass, C: 0.0100% or more, Si: 0.5% or less, Mn: 0.25 to 0.50%, P: 0.030% or less, S: 0.005% or less, Ni: 4.6 to 8.0%, Cr: 10.0 to 14.0%, Mo : 1.0-2.7%, Al: 0.1% or less, V: 0.005-0.2%, N: 0.1% or less, Ti: 0.06-0.25%, Cu: 0.01-1.0%, Co: 0.01-1.0%, and For oil country tubular goods having a yield stress of 758 MPa or more, with C, Mn, Cr, Cu, Ni, Mo, W, Nb, N, and Ti satisfying a predetermined relational expression, the composition having the balance Fe and unavoidable impurities, and having a yield stress of 758 MPa or more. Martensitic stainless steel seamless steel pipe.