Ni-based alloy for hot-working die, and hot-forging die using same

Patent metadata

Field	Value
Publication number	US-11326231-B2
Application number	US-201816767455-A
Country	US
Kind code	B2
Filing date	Sep 21, 2018
Priority date	Nov 29, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Provided are a Ni-based alloy for hot die having a high high-temperature compressive strength and a good oxidation resistance and being capable of suppressing the deterioration in the working environment and the shape deterioration, and a hot forging die made of the Ni-based alloy for hot die. The Ni-based alloy for hot die comprises, in mass %, W: 7.0 to 15.0%, Mo: 2.5 to 11.0%, Al: 5.0 to 7.5%, Cr: 0.5 to 3.0%, Ta: 0.5 to 7.0%, S: 0.0010% or less, one or two or more selected from rare-earth elements, Y, and Mg in a total amount of 0 to 0.020%, and the balance of Ni with inevitable impurities. In addition to the composition described above, one or two elements selected from Zr and Hf can further be contained in a total amount of 0.5% or less.

First claim

The invention claimed is:

1. A hot forging die made of a Ni-based alloy, comprising, in mass %, W: 7.0 to 15.0%, Mo: 2.5 to 11.0%, Al: 5.0 to 7.5%, Cr: 0.5 to 3.0%, Ta: 0.5 to 7.0%, S: 0.0010% or less, one or two or more selected from rare-earth elements, Y, and Mg in a total amount of 0 to 0.020%, and the balance of Ni with inevitable impurities.

2. The hot forging die according to claim 1 , wherein the Ni-based alloy further comprises, in mass %, one or two elements selected from Zr and Hf in a total amount of 0.5% or less.

3. The hot forging die according to claim 1 , wherein the Ni-based alloy further comprises, in mass %, one or two elements selected from Ti and Nb in a total amount of 3.5% or less, wherein a total content of Ta, Ti, and Nb is 1.0 to 7.0%.

4. The hot forging die according to claim 1 , wherein the Ni-based alloy further comprises, in mass %, 15.0% or less of Co.

5. The hot forging die according to claim 1 , wherein the Ni-based alloy further comprises, in mass %, one or two elements selected from C: 0.25% or less and B: 0.05% or less.

6. The hot forging die according to claim 1 , wherein the Ni-based alloy has 0.2% compressive strength at a test temperature of 1000° C. and a strain rate of 10 −3 /sec is 500 MPa or more.

7. The hot forging die according to claim 1 , wherein the Ni-based alloy has 0.2% compressive strength at a test temperature of 1100° C. and a strain rate of 10 −3 /sec is 300 MPa or more.

Assignees

• Hitachi Metals Ltd

Inventors

• Suzuki Shogo
• Ueno Tomonori
• Aoki Chuya

Classifications

• C22C19/057 Primary

  with the maximum Cr content being less 10% · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• B21J13/02

  Dies or mountings therefor · CPC title

• C22C19/05

  with chromium · CPC title