Ni-based alloy having excellent hot forgeability and corrosion resistance, and large structural member

Patent metadata

Field	Value
Publication number	US-9809873-B2
Application number	US-201415110997-A
Country	US
Kind code	B2
Filing date	Jul 14, 2014
Priority date	Feb 26, 2014
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A Ni-based alloy having excellent hot forgeability and corrosion resistance includes, by mass %, Cr: more than 18% to less than 21%, Mo: more than 18% to less than 21%, Ta: 1.1% to 2.5%, Mg: 0.001% to 0.05%, N: 0.001% to 0.04%, Mn: 0.001% to 0.5%, Si: 0.001% to 0.05%, Fe: 0.01% to 1%, Co: 0.01% or more and less than 1%, Al: 0.01% to 0.5%, Ti: 0.01% or more and less than 0.1%, V: 0.005% or more and less than 0.1%, Nb: 0.001% or more and less than 0.1%, B: 0.0001% to 0.01%, Zr: 0.001% to 0.05%, and a balance consisting of Ni and unavoidable impurities.

First claim

The invention claimed is:

1. A Ni-based alloy having improved hot forgeability and corrosion resistance comprising, by mass%:
Cr: more than 18% to less than 21%;
Mo: more than 18% to less than 21%;
Ta: 1.1% to 2.5%;
Mg: 0.001% to 0.05%;
N: 0.001% to 0.04%;
Mn: 0.001% to 0.5%;
Si: 0.001% to 0.05%;
Fe: 0.01% to 1%;
Co: 0.01% or more and less than 1%;
Al: 0.01% to 0.5%;
Ti: 0.01% or more and less than 0.1%;
V: 0.005% or more and less than 0.1%;
Nb: 0.001% or more and less than 0.1%;
B: 0.0001% to 0.01%;
Zr: 0.001% to 0.05%; and
a balance consisting of Ni and unavoidable impurities.

2. The Ni-based alloy having improved hot forgeability and corrosion resistance according to claim 1 further comprising, by mass %, one or more of
Cu: 0.001% or more and less than 0.1%, and
W: 0.001% or more and less than 0.1%.

3. The Ni-based alloy having improved hot forgeability and corrosion resistance according to claim 1 further comprising, by mass %,
Ca: 0.001% or more and less than 0.05%.

4. The Ni-based alloy having improved hot forgeability and corrosion resistance according to any one of claims 1 further comprising, by mass %,
Hf: 0.001% or more and less than 0.05%.

5. A large structural member formed by the Ni-based alloy having improved hot forgeability and corrosion resistance according to claim 1 .

6. The Ni-based alloy having improved hot forgeability and corrosion resistance according to claim 1 , wherein an amount of Mo is 18.5% to less than 21%.

7. The Ni-based alloy having improved hot forgeability and corrosion resistance according to claim 1 , wherein the amount of Ta is 1.5% to 2.5%.

8. The Ni-based alloy having improved hot forgeability and corrosion resistance according to claim 1 , wherein an amount of Mo is 18.5% to less than 21% and an amount of Ta is 1.5% to 2.5%.

Assignees

• Hitachi Metals Mmc Superalloy Ltd
• Hitachi Metals Ltd

Inventors

• Sugahara Katsuo

Classifications

• C22C19/056 Primary

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• C22C19/05

  with chromium · CPC title

• C22C19/055

  with the maximum Cr content being at least 20% but less than 30% · CPC title