AUSTENITIC HEAT RESISTANT STEEL EXCELLENT IN PROCESSABILITY, HIGH TEMPERATURE STRENGTH AND TOUGHNESS AFTER AGING

摘要

PROBLEM TO BE SOLVED: To provide an austenitic heat resistant steel having thermal stability, hot processability and toughness after aging.;SOLUTION: There is provided an austenitic heat resistant steel excellent in processability, high temperature strength and toughness after aging, containing, by mass%, C:0.01 to 0.10%, Si:0.20 to 1.00%, Mn:1.00 to 2.50%, Ni:9.5 to 32.5%, Cr:13.0 to 25.0%, Mo:0.01 to 2.00%, Al:0.05% or less, Nb:0.10 to 0.80, W:5.00 to 9.00%, N:0.005 to 0.015%, B:0.001 to 0.005%, further having one or more kind of Ti:0.500% or less, V:0.20% or less, Ta:1.000% or less, {([Mo]+0.5[W])/5}+{(15[C]+13[N])/(3.8[Ti]+1.9[Nb]+3.5[V]+1.1[Ta])}=1.5 to 4.0 and Formula 2:([Cr]+3[Mo]-15.8)/[Ni]≤0.25 and the balance Fe with inevitable impurities.;SELECTED DRAWING: None;COPYRIGHT: (C)2017,JPO&INPIT