# US 10,870,908 B2 · Hardening nickel-chromium-iron-titanium-aluminium alloy with good wear resistance, creep strength, corrosion resistance and processability

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- Number: US 10,870,908 B2
- Document ID: US10870908B2
- Status: Granted
- Kind: B2
- Application number: 15/105,636
- Filed: 2015-01-12
- Published: 2016-11-03
- Granted: 2020-12-22
- Earliest claimed: 2014-02-04
- Assignees: VDM Metals International GmbH
- Applicants: VDM Metals International GmbH
- Inventors: Heike Hattendorf
- Web page: https://patentgrep.com/patent/US10870908B2

## CPC

- C22C 30/02: containing copper
- C22C 19/05: with chromium
- C22C 19/056: {with the maximum Cr content being at least 10% but less than 20%}
- C22C 30/00: Alloys containing less than 50% by weight of each constituent
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

Age-hardening nickel-chromium-cobalt-titanium-aluminum wrought alloy with very good wear resistance combined with very good creep strength, good high-temperature corrosion resistance and good processability, the alloy including (in % by mass) >18 to 26% chromium, 1.5 to 3.0% titanium, 0.6 to 2.0% aluminum, 5.0 to 40% cobalt, 0.005 to 0.10% carbon, 0.0005 to 0.050% nitrogen, 0.0005 to 0.030% phosphorus, max. 0.010% sulfur, max. 0.020% oxygen, max. 0.70% silicon, max. 2.0% manganese, max. 0.05% magnesium, max. 0.05% calcium, max. 0.5% molybdenum, max. 0.5% tungsten, max. 0.2% niobium, max. 0.5% copper, max. 0.5% vanadium, optionally 0 to 20% Fe, optionally 0 to 0.20% Zr, optionally 0.0001 to 0.008% boron, optionally 0-0.20% Y, La, Ce, Ce mixed metal, and/or Hf, and/or 0-0.60% Ta, remainder nickel and the conventional process-related impurities are adjusted in contents of max. 0.002% Pb, max. 0.002% Zn, max. 0.002% Sn, wherein the nickel content is greater than 35%, wherein the relationship Cr+Fe+Co≥25% (1) has to be satisfied in order to achieve good wear resistance, and the relationship fh≥0 (2a), where fh=6.49+3.88 Ti+1.36 Al−0.301 Fe+(0.759−0.0209 Co) Co−0.428 Cr−28.2 C, (2) has to be satisfied in order that an adequate strength at higher temperatures is provided, wherein Ti, Al, Fe, Co, Cr and C are the concentration of the elements in question in % by mass and fh is given in %.

## Claims

### Claim 1

An age-hardened nickel-chromium-cobalt-titanium-aluminum wrought alloy with (in mass-%) >19 to 22% chromium, 1.5 to 3.0% titanium, 0.6 to 1.69% aluminum, 29.21 to 35% cobalt, 0.005 to 0.10% carbon, 0.0005 to 0.050% nitrogen, 0.0005 to 0.030% phosphorus, max. 0.010% sulfur, max. 0.020% oxygen, max. 0.2% silicon, max. 2.0% manganese, max. 0.05% magnesium, max. 0.05% calcium, max. 0.05% molybdenum, max. 0.05% tungsten, max. 0.2% niobium, max. 0.015% copper, max. 0.5% vanadium, 0 to 20% Fe, 0 to 0.20% Zr, wherein the alloy may also contain at least one element from the group consisting of:
B 0.0001-0.008%
Y 0-0.20%;
La 0-0.20%;
Ce 0-0.20%;
Ce mixed metal 0-0.20%;
Hf 0-0.20%; and
Ta 0-0.40%,
the rest nickel and the usual process-related impurities are adjusted in contents of max. 0.002% Pb, max. 0.002% Zn, max. 0.002% Sn, wherein the nickel content is greater than 35% and the following relationships must be satisfied:
Cr+Fe+Co≥25% (1)
fh≥0 with (2a)
fh=6.49+3.88 Ti+1.36 Al−0.301 Fe+(0.759−0.0209 Co)Co−0.428 Cr−28.2 C (2)
wherein Ti, Al, Fe, Co, Cr and C are the concentrations of the elements in question in mass-% and fh is expressed in %.

### Claim 2 (depends on 1)

Alloy according to claim 1, with an aluminum content of 0.9 to 1.69%.

### Claim 3 (depends on 1)

Alloy according to claim 1, with a carbon content of 0.01-0.10%.

### Claim 4 (depends on 1)

Alloy according to claim 1, with an iron content of >0 to 15.0%.

### Claim 5 (depends on 1)

Alloy according to claim 1, with a boron content of 0.0005 to 0.006%.

### Claim 6 (depends on 1)

Alloy according to claim 1, in which the nickel content is greater than 40%.

### Claim 7 (depends on 1)

Alloy according to claim 1, in which the nickel content is greater than 45%.

### Claim 8 (depends on 1)

Alloy according to claim 1, in which the nickel content is greater than 50%.

### Claim 9 (depends on 1)

Alloy according to claim 1, with
Cr+Fe+Co≥26% (1a)
wherein Cr, Fe and Co are the concentrations of the elements in question in mass-%.

### Claim 10 (depends on 1)

Alloy according to claim 1, with
fh≥1 with (2b)
fh=6.49+3.88 Ti+1.36 Al−0.301 Fe+(0.759−0.0209 Co)Co−0.428 Cr−28.2 C (2)
wherein Ti, Al, Fe, Co, Cr and C are the concentrations of the elements in question in mass-% and fh is expressed in %.

### Claim 11 (depends on 1)

Alloy according to claim 1, in which the following relationship between Cr, Mo, W, Fe, Co, Ti, Al and Nb is satisfied, in order that processability is achieved:
fver=≤7 with (3a)
fver=32.77+0.5932 Cr+0.3642 Mo+0.513 W+(0.3123−0.0076 Fe)Fe+(0.3351−0.003745 Co−0.0109 Fe)Co+40.67 Ti*Al+33.28 Al2−13.6 Ti*Al2−22.99 Ti−92.7 Al+2.94 Nb (3)
wherein Cr, Mo, W, Fe, Co, Ti, Al and Nb are the concentrations of the elements in question in mass-% and fver is expressed in %.

### Claim 12 (depends on 1)

A product comprising the alloy according to claim 1, wherein the product is selected from the group consisting of: a strip, a sheet, a wire, a rod, a longitudinally welded pipe, and a seamless pipe.

### Claim 13 (depends on 1)

A valve comprising the alloy according to claim 1.

### Claim 14 (depends on 1)

A product comprising the alloy according to claim 1, wherein the product is selected from the group consisting of: components of gas turbines, fastening bolts, springs, and turbochargers.

### Claim 15 (depends on 1)

Alloy according to claim 1, with a zirconium content of 0.01 to 0.20%.