CORROSION RESISTANT STEEL HAVING EXCELLENT CARBON DIOXIDE GAS CORROSION RESISTANCE AND WELD ZONE TOUGHNESS, AND CORROSION RESISTANT LINE PIPE USING THE STEEL

摘要

PROBLEM TO BE SOLVED: To provide a corrosion resistant steel which has excellent carbon dioxide gas corrosion resistance and weld zone toughness and suitable as oil well pipes and line pipes for the production and transportation of gas, petroleum or the like used in an energy field or steel for plants, and to provide a corrosion resistant line pipe.;SOLUTION: The corrosion resistant steel having carbon dioxide gas corrosion resistance and weld zone toughness has a composition containing, by mass, ≤0.30% C, 2.0 to 13.0% Cr and 0.0001 to 0.01% Mg, and, if required, containing ≤0.5% Si, 0.2 to 2.0% Mn, 0.001 to 0.20% Al and ≤0.015% N, and, if required, further containing Ti, Nb, Cu, Ni and Mo, and balance iron with inevitable impurities. The corrosion resistant line pipe uses the steel.;COPYRIGHT: (C)2002,JPO