| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide high strength heat resistant steel with excellent high-temperature creep rupture strength and excellent Charpy impact values by optimizing the chemical composition of N, Mo, and W-added austenitic heat resistant steel. <P>SOLUTION: The high strength austenitic heat resistant steel includes, by mass%, C: 0.02-0.08%, Si: above 0.3-0.8%, Mn: 0.6-2.0%, P: ≤0.04%, S: ≤0.010%, Ni: above 15-26%, Cr: 18-23%, W: 1.8-4.2%, Mo: ≤0.5%, Nb: 0.2-0.5%, Al: 0.001-0.040%, N: 0.07-0.13% with the balance being Fe and inevitable impurities, and satisfies the following formulae (1) and (2). W+2Mo=2.8 to 4.2% (1). Ni+27C+23N+0.2Mn+0.3Cu-1.2(Cr+Mo+0.5W)-0.5Si-0.3Nb+10≥9.5% (2). <P>COPYRIGHT: (C)2013,JPO&INPIT |
