METHOD FOR WORKING FERRITIC HEAT RESISTANT STEEL AND FERRITIC HEAT RESISTANT STEEL HAVING EXCELLENT WATER VAPOR OXIDATION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a method for working ferritic heat resistant steel having water vapor oxidation resistance, by which the formation of oxidized scale can be suppressed, and the peeling of oxidized scale does not substantially occur even in a heating-cooling cycle.;SOLUTION: The ferritic heat resistant steel having a composition containing, by mass, 0.02 to 0.3% C, 0.02 to 0.6% Si, 0.01 to 2% Mn and 9.5 to 15% Cr is subjected to normalizing treatment at ≥900°C, is subjected to tempering treatment at the A₁ transformation point or lower. After that, the surface of the steel is sprayed with grains to form a shot worked layer thereon.;COPYRIGHT: (C)2002,JPO