# US 11,441,217 B2 · Method for producing semi-finished products from a nickel-based alloy

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- Number: US 11,441,217 B2
- Document ID: US11441217B2
- Status: Granted
- Kind: B2
- Application number: 16/761,609
- Filed: 2018-12-07
- Published: 2020-10-15
- Granted: 2022-09-13
- Earliest claimed: 2017-12-14
- Assignees: VDM Metals International GmbH
- Applicants: VDM Metals International GmbH
- Inventors: Jutta Kloewer; Ali Aghajani; Julia Kraemer geb. Rosenberg
- Web page: https://patentgrep.com/patent/US11441217B2

## CPC

- C22C 19/055: {with the maximum Cr content being at least 20% but less than 30%}
- C22F 1/10: of nickel or cobalt or alloys based thereon
- C22C 19/056: {with the maximum Cr content being at least 10% but less than 20%}
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## Abstract

A method produces semi-finished products from a nickel-based alloy having the composition (in wt. %): Ni>50-<55%, Cr>17-<21%, Nb>4.8-<5.2%, Mo>2.8-<3.3%, Ti>0.8-<1.15%, Al>0.4-<0.6%, C maximum 0.045%, Co maximum 1.0%, Mn maximum 0.35%, Si maximum 0.35%, S maximum 0.01%, Cu maximum 0.3%, the remainder iron and unavoidable impurities. B 0.0001-0.01%, P 0.0001-0.02% are added. In the method: the alloy is melted, or remelted, to produce preliminary products that then undergo a hot-forming process and subsequently undergo a multi-stage annealing and aging treatment, a solution heat treatment being carried out between 1000 and 1100° C. for 1-3 hours, then cooled in air, water or oil, and made to undergo a precipitation hardening process between 650° C.-<770° C. for 5-9 hours, then cooled to room temperature, the intermediate products undergoing, if necessary, at least one further heating process.

## Claims

### Claim 1

A method for the manufacture of semifinished products from a nickel-base alloy of the following composition (in mass %)
Ni >50-<55%
Cr >17-<21%
Nb >4.8-<5.2%
Mo >2.8-<3.3%
Ti >0.8 to <1.15%
Al >0.4 to <0.6%
C max. 0.045%
Co max. 1.0%
Mn max. 0.35%
Si max. 0.35%
S max. 0.01%
Cu max. 0.3%
Fe the rest as well as unavoidable impurities,
wherein the following elements are added as alloy constituents within the specified ranges:
B 0.0001-0.01%
P 0.0001-0.02%
wherein, for production of precursor products, the alloy is melted and if necessary remelted, the precursor products are subjected to at least one hot forming, the precursor products are then subjected to a multi-stage annealing and aging treatment,
wherein a solution-annealing treatment is undertaken in the temperature range between 1000 and 1100° C. for a period between 1 hour and 3 hours, the precursor products are cooled in air, water or oil, the precursor products are subjected to a precipitation hardening in the temperature range of 650° C.-<770° C. for a period of 5 hours to 9 hours and the precursor products are cooled to room temperature,
wherein the precursor products are subjected if necessary to at least one further heating, and
wherein specimens of the precursor product are subjected to a corrosion test with low strain rate, wherein a reduction of area at break ratio Z≥0.57 is obtained during the use of an NaCl solution with additions of CO2 and H2S.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the limit values for B and P are given as follows:
B 30-60 ppm
P 70-130 ppm.

### Claim 3 (depends on 1)

The method according to claim 1, comprising the total formula P+B
P+B≤150 ppm.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the reduction of area at break of the specimens exposed to a 24% NaCl solution with additions of CO2 and H2S is brought about at 149° C. and a strain rate of 4×10−6.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the notched-bar impact bend tests performed on the alloy yield a notch impact energy of ≥215 J.

### Claim 6

A method for the manufacture of semifinished products from a nickel-base alloy of the following composition (in mass %)
Ni >50-<55%
Cr >17-<21%
Nb >4.8-<5.2%
Mo >2.8-<3.3%
Ti >0.8 to <1.15%
Al >0.4 to <0.6%
C max. 0.045%
Co max. 1.0%
Mn max. 0.35%
Si max. 0.35%
S max. 0.01%
Cu max. 0.3%
Fe the rest as well as unavoidable impurities,
wherein the following elements are added as alloy constituents within the specified ranges:
B 0.0001-0.01%
P 0.0001-0.02%
wherein, for production of precursor products, the alloy is melted and if necessary remelted, the precursor products are subjected to at least one hot forming, the precursor products are then subjected to a multi-stage annealing and aging treatment,
wherein a solution-annealing treatment is undertaken in the temperature range between 1000 and 1100° C. for a period between 1 hour and 3 hours, the precursor products are cooled in air, water or oil, the precursor products are subjected to a two-stage precipitation hardening, namely in the temperature range of 650° C.-<770° C. at first for a period of 5 hours to 9 hours and then in the temperature range of 600° C.-650° C. for a period of 5 hours to 9 hours and the precursor products are cooled to room temperature,
wherein the precursor products are subjected if necessary to at least one further heating, and
wherein specimens of the precursor product are subjected to a corrosion test with low strain rate, wherein a reduction of area at break ratio Z≥0.57 is obtained during the use of an NaCl solution with additions of CO2 and H2S.