DUPLEX STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE IN HYDROGEN SULFIDE ATMOSPHERE

摘要

PURPOSE: To obtain a two-phase stainless steel excellent in hydrogen sulfide corrosion resistance under atmosphere containing high concn. of the hydrogen sulfide. ;CONSTITUTION: The duplex stainless steel containing, by wt., 0.01-1.0% Si, 0.1-1.5% Mn, 20.0-30.0% Cr, 5.0-10.0% Ni, 0.01-0.2% sol-Al, 0.2 to 0.4% N and 2.0-5.0% Cu, and 2.5-5.0% Mo and/or 2.0-3.0% W, and further, one or more kinds among 0-0.10% REM, 0-0.20% Y, 0-0.10% Mg and 0-0.10% Ca, and the balance Fe with inevitable impurities, in which C, P and S are ≤0.030%, ≤0.03% and ≤0.01%, respectively is used. By this constitution, the two layer structural films composed of the corrosion resistant film of mainly Ni sulfide containing copper sulfide at the outer layer on the steel surface by adding Cu and the passive film composed of densified Cr oxide at the inner layer are produced and formed.;COPYRIGHT: (C)1996,JPO