Patent ID: 7731895

Claim:
An austenitic Fe—Ni—Cr alloy consisting of, in percent by mass, C: 0.05-0.15%, Si: not more than 2%, Mn: 0.1-3%, P: 0.10-0.30%, S: not more than 0.03%, Cr: 15-28%, Ni: 8-55%, Ti: 0.05-0.6% REM: 0.001-0.5%, sol. Al: 0.001-0.1%, N: not more than 0.03%, one or more elements selected from among Mo: 0.05-50%, W: 0.05-10%, but “Mo+(W/2)” is not more than 5%, B: 0.0005-0.005%, Nb: 0.05-0.8%, Co: 0.05-5%, Zr: 0.0005-0.2%, Hf: 0.0005-1% and Ta: 0.01-8%, and the balance being Fe and incidental impurities.