AUSTENITIC STEEL FOR WET AND CORROSIVE ENVIRONMENT

摘要

PURPOSE:To obtain the titled steel having superior toughness, weldability and strength as well as satisfactorily superior corrosion resistance by combinedly adding Mo and W to a high Cr-high Ni steel having a specified composition. CONSTITUTION:This austenitic steel consists of, by weight, =0.04% C, =2.0% Si, =2.0% Mn, 18.5-22.5% Cr, 16.0-30.0% Ni, 0.4-4.0% Mo, 0.05-4.0% W [Mo (%)+W(%)=1.0] and the balance Fe or further contains 0.02-0.25% N and/ or =1.5% Ti and/or =1.5% Nb. The steel has satisfactorily superior corrosion resistance even in various wet and corrosive environments and also has satisfactory toughness, weldability and strength required as a structural material.