HIGH-STRENGTH AUSTENITIC HEAT RESISTANT STEEL EXCELLENT IN WELDABILITY AND SATISFACTORY IN HIGH TEMPERATURE CORROSION RESISTANCE

摘要

PURPOSE: To provide austenitic heat resistant steel showing excellent performance in the case of use for a boiler in a severe using environment. ;CONSTITUTION: This steel contains, by mass, 0.02% C, ≤1.5% Si, 0.3 to 1.5% Mn, ≤0.02% P, ≤0.005% S, 18 to 26% Cr, 20 to 40% Ni, 0.5 to 10.0% W, 0.05 to 0.4% Nb, 0.01 to 0.2% Ti, 0.003 to 0.008% B and 0.05 to 0.3% N, furthermore contains, as necessary, 0.5 to 2.0% Mo and/or one or ≥ two kinds among 0.001 to 0.05% Mg, 0.001 to 0.05% Ca and 0.001 to 0.15% rare earth elements, and the balance Fe with inevitable impurities.;COPYRIGHT: (C)1994,JPO