Austenitic Fe-Ni-Cr alloy
AssigneeSumitomo Metal Industries, Ltd.
InventorsHirokazu Okada, Masaaki Igarashi, Kazuhiro Ogawa, Yasutaka Noguchi
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Abstract
An austenitic stainless steel improved in creep strength, creep ductility, weldability and also hot workability. The steel, consisting of, by mass %, C: 0.05-0.15%, Si: not more than 2%, Mn: 0.1-3%, P: 0.05-0.30%, S: not more than 0.03%, Cr: 15-28%, Ni: 8-55%, Cu: 0-3.0%, Ti: 0.05-0.6%, REM: 0.001-0.5%, sol. Al: 0.001-0.1%, N: not more than 0.03%, and the balance being Fe and incidental impurities. This steel may contain one or more of Mo, W, B, Nb, V, Co, Zr, Hf, Ta, Mg and Ca. It is preferable that REM is Nd.
Claims4
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.
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:
- 0.05-5%, W:
- 0.05-10%, but “Mo+(W/2y” is not more than S %, 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%, either one or both of Mg:
- 0.0005-0.05% and Ca:
- 0.0005-0.05%, and the balance being Fe and incidental impurities.
Dependencies are inferred from the claim text.