CORROSION RESISTANT STEEL EXCELLENT IN GASEOUS CARBON DIOXIDE CORROSION RESISTANCE, AND CORROSION RESISTANT OIL WELL PIPE

摘要

PROBLEM TO BE SOLVED: To produce a corrosion resistant steel most suitably used as a steel for oil well pipe and line pipe for production and transportation of gas, oil, or the like, for use in the field of energy or as a steel for a plant thereof, excellent in strength and toughness at a low temperature, and also excellent in gaseous CO₂ corrosion resistance and seawater corrosion resistance and also to produce a corrosion resistant oil well pipe. ;SOLUTION: This steel has a composition consisting of, by weight, ≤0.30% C, ≤1.0% Si, 0.2-2.0% Mn, 2.1-5.0% Cr, ≤0.03% P, ≤0.02% S, ≤0.10% Al, ≤0.015% N, and the balance iron with inevitable impurities and containing, if necessary, Cu, Ni, Mo, Ti, Nb, and B and also the metallic structure is composed of martensite.;COPYRIGHT: (C)1999,JPO