Excellent and a method of manufacturing the same austenitic heat-resistant steel with a high-temperature strength

摘要

PROBLEM TO BE SOLVED: To provide a high-strength heat-resistant steel excellent in high temperature strength by optimizing chemical component additional quantities and homogenizing composition.;SOLUTION: The high-strength austenitic heat-resistant steel contains, by mass%, 0.02-0.08% C, 0.3-0.8% Si, 0.6-2.0% Mn, ≤0.040% P, ≤0.005% S, 15-26% Ni, 18-23% Cr, 1.8-4.2% W, ≤0.5% Mo, 0.2-0.5% Nb, 0.001-0.040% Al, 0.07-0.13% N, 0.001% B and the balance Fe with inevitable impurities, and satisfies the following three formulas: 0.05%≤Nb-0.031(C+N)^{(-0.744Nb-0.772)}≤0.15%; 2.8%≤W+2Mo≤4.2%; and 9.5%≤Ni+27C+23N+0.2Mn+0.3Cu-1.2(Cr+Mo+0.5W)-0.5Si-0.3Nb+10%.;COPYRIGHT: (C)2013,JPO&INPIT