# US 10,119,182 B2 · Ni-based superalloy for hot forging

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- Number: US 10,119,182 B2
- Document ID: US10119182B2
- Status: Granted
- Kind: B2
- Application number: 15/405,204
- Filed: 2017-01-12
- Published: 2017-08-24
- Granted: 2018-11-06
- Earliest claimed: 2016-02-18
- Assignees: Daido Steel Co., Ltd.
- Applicants: Daido Steel Co., Ltd.
- Inventors: Mototsugu Osaki; Shigeki Ueta; Kohki Izumi
- Web page: https://patentgrep.com/patent/US10119182B2

## CPC

- C22C 19/056: {with the maximum Cr content being at least 10% but less than 20%}
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

The present invention relates to an Ni-based superalloy for hot forging, containing, in terms of % by mass, C: more than 0.001% and less than 0.100%, Cr: 11% or more and less than 19%, Co: more than 5% and less than 25%, Fe: 0.1% or more and less than 4.0%, Mo: more than 2.0% and less than 5.0%, W: more than 1.0% and less than 5.0%, Nb: 2.0% or more and less than 4.0%, Al: more than 3.0% and less than 5.0%, and Ti: more than 1.0% and less than 3.0%, with the balance being unavoidable impurities and Ni, in which the component composition satisfies the following two relationships: 3.5≤([Ti]+[Nb])/[Al]×10<6.5 and 9.5≤[Al]+[Ti]+[Nb]<13.0.

## Claims

### Claim 1

An Ni-based superalloy for hot forging, having a component composition consisting of, in terms of % by mass,
C: more than 0.001% and less than 0.100%,
Cr: 11% or more and less than 19%,
Co: more than 5% and less than 25%,
Fe: 0.1% or more and less than 4.0%,
Mo: more than 2.0% and less than 5.0%,
W: more than 1.0% and less than 5.0%,
Nb: more than 2.6% and less than 3.2%,
Al: more than 3.0% and less than 5.0%, and
Ti: more than 1.0% and less than 3.0%,
with the balance being unavoidable impurities and Ni,
wherein, when a content of an element M in terms of atomic % is represented by [M], the component composition satisfies the following two relationships:
5.0≤([Ti]+[Nb])/[Al]×10<6.5 and
10.1≤[Al]+[Ti]+[Nb]≤11.6.

### Claim 2 (depends on 1)

The Ni-based superalloy according to claim 1, wherein the component composition satisfies the following relationship:
10.5≤[Al]+[Ti]+[Nb]<11.6.

### Claim 3 (depends on 1)

The Ni-based superalloy according to claim 1, wherein the amount of C in the component composition in terms of % by mass is:
C: more than 0.001% and less than 0.06%.

### Claim 4 (depends on 1)

The Ni-based superalloy according to claim 1, wherein the amount of Cr in the component composition in terms of % by mass is:
Cr: 13% or more and less than 19%.

### Claim 5 (depends on 1)

The Ni-based superalloy according to claim 1, wherein the amount of Co in the component composition in terms of % by mass is:
Co: more than 15% and less than 25%.

### Claim 6 (depends on 1)

The Ni-based superalloy according to claim 1, wherein the amount of Fe in the component composition in terms of % by mass is:
Fe: 0.1% or more and less than 3.0%.

### Claim 7 (depends on 1)

A high temperature part for a gas turbine or steam turbine, comprising:
the Ni-based superalloy according to claim 1.

### Claim 8

An Ni-based superalloy for hot forging, having a component composition consisting of, in terms of % by mass,
C: more than 0.001% and less than 0.100%,
Cr: 11% or more and less than 19%,
Co: more than 5% and less than 25%,
Fe: 0.1% or more and less than 4.0%,
Mo: more than 2.0% and less than 5.0%,
W: more than 1.0% and less than 5.0%,
Nb: more than 2.6% and less than 3.2%,
Al: more than 3.0% and less than 5.0%,
Ti: more than 1.0% and less than 3.0%, and
at least one selected from the group consisting of
B: less than 0.03%,
Zr: less than 0.1%,
Mg: less than 0.030%,
Ca: less than 0.030%, and
REM: 0.200% or less,
with the balance being unavoidable impurities and Ni,
wherein, when a content of an element M in terms of atomic % is represented by [M], the component composition satisfies the following two relationships:
5.0≤([Ti]+[Nb])/[Al]×10<6.5 and
10.1<[Al]+[Ti]+[Nb]≤11.6.

### Claim 9 (depends on 8)

The Ni-based superalloy according to claim 8, wherein the component composition comprises, in terms of % by mass, at least one element selected from the group consisting of:
Mg: 0.0001% or more and less than 0.030%,
Ca: 0.0001% or more and less than 0.030%, and
REM: 0.001% or more and 0.200% or less.

### Claim 10 (depends on 8)

The Ni-based superalloy according to claim 8, wherein the component composition comprises, in terms of % by mass, at least one element selected from the group consisting of:
B: 0.0001% or more and less than 0.03% and
Zr: 0.0001% or more and less than 0.1%.

### Claim 11 (depends on 10)

The Ni-based superalloy according to claim 10, wherein the component composition comprises, in terms of % by mass, at least one element selected from the group consisting of:
Mg: 0.0001% or more and less than 0.030%,
Ca: 0.0001% or more and less than 0.030%, and
REM: 0.001% or more and 0.200% or less.

### Claim 12 (depends on 8)

A high temperature part for a gas turbine or steam turbine, comprising:
the Ni-based superalloy according to claim 8.

### Claim 13

An Ni-based superalloy for hot forging, having a component composition consisting of, in terms of % by mass,
C: more than 0.001% and less than 0.06%,
Cr: 13% or more and less than 19%,
Co: more than 15% and less than 25%,
Fe: 0.1% or more and less than 3.0%,
Mo: more than 2.0% and less than 5.0%,
W: more than 1.0% and less than 5.0%,
Nb: more than 2.6% and less than 3.2%,
Al: more than 3.0% and less than 5.0%, and
Ti: more than 1.0% and less than 3.0%,
with the balance being unavoidable impurities and Ni,
wherein, when a content of an element M in terms of atomic % is represented by [M], the component composition satisfies the following two relationships:
5.0≤([Ti]+[Nb])/[Al]×10<6.5, and
10.1≤[Al]+[Ti]+[Nb]≤11.6.