The 655Nmm2 class which possesses high resistance stress corrosion crack Characteristic it is low C high Cr alloy oil well pipe and its production manner

摘要

PROBLEM TO BE SOLVED: To provide a 655Nmm-2 class low-C high-Cr alloy oil well pipe usable without causing stress corrosion cracking even under the environment containing hydrogen sulfide in large amounts while maintaining corrosion resistance by simultaneously improving the stress corrosion cracking resistance and toughness of the conventional high strength martensitic stainless steel, and its manufacturing method.;SOLUTION: The 655Nmm-2 class low-C high-Cr alloy oil well pipe having high stress corrosion cracking resistance is composed of an alloy steel which has a composition consisting of, by weight, 0.005-0.05% C, 12-16% Cr, ≤1.0% Si, 0.05-0.3% Mn, 3.5-6.0% Ni, 1.5-2.5% Mo, 0.01-0.05% V, ≤0.02% N, and the balance Fe with inevitable impurities and satisfying the relation of 705-25[% Ni]+5[%Cr]+25[%Mo]≥680.;COPYRIGHT: (C)2000,JPO