US3973952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant alloy casting
Assignee: Huntington Alloys Corp
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Filing: 1973-06-11
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Granted: 1976-08-10
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Expires: 1993-06-11
Abstract
Abstract Heat-resistant alloy containing specially controlled proportions of nickel, chromium, titanium, aluminum, tungsten, molybdenum and tantalum is especially advantageous for production of heat resistant castings having strength and ductility throughout a broad range of temperatures, particularly including stress-rupture strength at 1850°F. and ductility at intermediate temperatures such as 1400°F.
Inventors
- 👤 Clarence George Bieber
- 👤 John Raymond Mihalisin
- 👤 John Joseph Galka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:01
CPC Classifications
C; C30; C30B; C30B11/00; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/057; C30B29/00; C30B29/10; C30B29/52; C30B29/60; C30B29/605; C30B33/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
167 words
A cast article composed of an alloy comprising 5% to 9% chromium, 7.5% to 12% tungsten and 1% to 4% molybdenum with the total of tungsten-plus-molybdenum not greater than 14% and the total of chromium-plus-tungsten-plus-molybdenum not greater than 20%, 7% to 16% cobalt, 3% to 6% tantalum, 2.5% to 5% aluminum and 2.5% to 5% titanium with the total of aluminum-plus-titanium being 6.5% to 8.5%, 0.01% to 0.2% carbon, 0.01% to about 0.2% zirconium, 0.01% to about 0.1% boron, up to about 3% hafnium, up to about 2% columbium, up to about 2% iron, up to about 1% vanadium, up to 0.02% yttrium and balance essentially nickel in an amount comprising at least 50% of the alloy and characterized, after a double heat treatment comprising heating at least one hour at 1975°F. to 2200°F., air cooling, thereafter heating at least 12 hours at 1500°F. to 1600°F., and air cooling, by a stress rupture life of at least 20 hours at 29,000 pounds per square inch and 1850°F.
Claim 2
Dependent Claim
167 words
A cast article composed of an alloy comprising 5% to 9% chromium, 7.5% to 12% tungsten and 1% to 4% molybdenum with the total of tungsten-plus-molybdenum not greater than 14% and the total of chromium-plus-tungsten-plus-molybdenum not greater than 20%, 7% to 16% cobalt, 3% to 6% tantalum, 2.5% to 5% aluminum and 2.5% to 5% titanium with the total of aluminum-plus-titanium being 6.5% to 8.5%, 0.01% to 0.2% carbon, 0.01% to about 0.2% zirconium, 0.01% to about 0.1% boron, up to about 3% hafnium, up to about 2% columbium, up to about 2% iron, up to about 1% vanadium, up to 0.02% yttrium and balance essentially nickel in an amount comprising at least 50% of the alloy and characterized, after a double heat treatment comprising heating at least one hour at 1975°F. to 2200°F., air cooling, thereafter heating at least 12 hours at 1500°F. to 1600°F., and air cooling, by a stress rupture life of at least 20 hours at 29,000 pounds per square inch and 1850°F.
Claim 3
Dependent Claim
13 words
An alloy as set forth in claim 1 containing 6% to 8% chromium.
Claim 4
Dependent Claim
13 words
An alloy as set forth in claim 1 containing 2% to 4% molybdenum.
Claim 5
Dependent Claim
13 words
An alloy as set forth in claim 1 containing 8% to 10% tungsten.
Claim 6
Dependent Claim
22 words
An alloy as set forth in claim 1 containing 6% to 8% chromium, 2% to 4% molybdenum, and 8% to 10% tungsten.
Claim 7
Dependent Claim
27 words
An alloy as set forth in claim 1 wherein the total of tungsten-plus-molybdenum is 10% to 12% and the total of chromium-plus-tungsten-plus molybdenum is at least 16%.
Claim 8
Dependent Claim
17 words
An alloy as set forth in claim 1 wherein the total of aluminum-plus-titanium is at least 7.5%.
Claim 9
Dependent Claim
24 words
An alloy as set forth in claim 1 wherein the titanium content exceeds the aluminum content by a ratio of 1.2 to 1.8 titanium-to-aluminum.
Claim 10
Dependent Claim
24 words
An alloy as set forth in claim 1 wherein the aluminum content exceeds the titanium content by a ratio of 1.5 to 2 aluminum-to-titanium.
Claim 11
Dependent Claim
26 words
An alloy as set forth in claim 1 wherein the total of chromium-plus-tungsten-plus-molybdenum is 17% or greater and the tantalum content is not greater than 5%.
Claim 12
Dependent Claim
17 words
An alloy as set forth in claim 1 wherein the carbon content is not greater than 0.15%.
Claim 13
Dependent Claim
26 words
An alloy as set forth in claim 1 containing metal from the group consisting of up to 3% hafnium, up to 0.02% yttrium and mixtures thereof.
Claim 14
Dependent Claim
58 words
An alloy as set forth in claim 1 containing 7% to 8% chromium, 8% to 12% cobalt, 7.5% to 10.5% tungsten, 1.5% to 2.5% molybdenum, 3% to 4.5% tantalum, 2.5% to 3.5% aluminum, 4% to 5% titanium, 0.06% to 0.15% carbon, .05% to 0.15% zirconium, .01% to 0.08% boron and having a nickel content of at least 55%.
Claim 15
Dependent Claim
13 words
An alloy as set forth in claim 13 containing 9% to 10.5% tungsten.
Claim 16
Dependent Claim
13 words
An alloy as set forth in claim 13 containing 7.5% to 8.5% tungsten.
Claim 17
Dependent Claim
14 words
An article as set forth in claim 1 having a directionally solidified grain structure.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |