DUPLEX STAINLESS STEEL EXCELLENT IN HYDROGEN SULFIDE CORROSION RESISTANCE

摘要

PURPOSE: To provide duplex stainless steel in which H₂S corrosion resistance is improved and hot workability is scarcely deteriorated comparted to that of the conventional steel SUS 320J₂L. ;CONSTITUTION: The amounts of S, O and Ca to be added are limited as well as the amounts of Cr, Ni, Mo and N to be added contributing to the phase balance affecting its hot workability are limited, by which, while hot workability equal to that of the conventional steel is maintained, the amounts of Cr, Ni, Mo and N controlling its H₂S corrosion resistance are optimized within the limiting range. The compsn. of the steel is constituted of ≤0.03% C, ≤1.0% Si, ≤1.5% Mn, ≤0.03% P, ≤0.0015% S, 24 to 26% Cr, 9 to 13% Ni, 4 to 5% Mo, 0.03 to 0.20% N, 0.01 to 0.04% Al, ≤0.005% O and 0.001 to 0.005% Ca.;COPYRIGHT: (C)1993,JPO&Japio