US4200459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant low expansion alloy
Assignee: Huntington Alloys Corp
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Filing: 1977-12-14
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Granted: 1980-04-29
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Expires: 1997-12-14
Abstract
Abstract Nickel-iron base alloy characterized by controlled thermal expansion coefficient and inflection temperature and by desirable high strength in age-hardened condition has composition specially restricted to overcome detrimental sensitivity to stress-concentrating geometries and aid resistance to long-enduring stress in heated oxidizing atmospheres. The alloy contains, by weight, 34% to 55.3% nickel, up to 25.2% cobalt, 1% to 2% titanium, 1.5% to 5.5% of columbium plus 1/2 the weight percent of any tantalum, up to 1% chromium, not more than 0.2% aluminum and the balance essentially iron.
Inventors
- 👤 Darrell F. Smith, Jr.
- 👤 David G. Tipton
- 👤 Edward F. Clatworthy
- 👤 Donald E. Wenschhof, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:57
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/007; C22C38/00; C22C38/10; C22C38/105
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
111 words
An age-hardenable alloy comprising 34% to 55.3% nickel, up to 25.2% cobalt, 1% to 2% titanium, 1.5% to 11% metal from the group columbium, tantalum and mixtures thereof in an amount providing that the total of columbium plus 1/2 tantalum is 1.5% to 5.5% of the alloy, up to 2% manganese and up to 1% chromium, and balance essentially iron with any presence of aluminum being restricted to 0.20% or lower, and characterized in the age-hardened conditioned by a thermal expansion inflection temperature of at least 650° F., a coefficient of expansion of 5.5%×10 -6 per °F. and a room temperature yield strength of at least 110,000 pounds per square inch.
Claim 2
Dependent Claim
111 words
An age-hardenable alloy comprising 34% to 55.3% nickel, up to 25.2% cobalt, 1% to 2% titanium, 1.5% to 11% metal from the group columbium, tantalum and mixtures thereof in an amount providing that the total of columbium plus 1/2 tantalum is 1.5% to 5.5% of the alloy, up to 2% manganese and up to 1% chromium, and balance essentially iron with any presence of aluminum being restricted to 0.20% or lower, and characterized in the age-hardened conditioned by a thermal expansion inflection temperature of at least 650° F., a coefficient of expansion of 5.5%×10 -6 per °F. and a room temperature yield strength of at least 110,000 pounds per square inch.
Claim 3
Dependent Claim
16 words
An alloy as set forth in claim 1 wherein any aluminum content does not exceed 0.10%.
Claim 4
Dependent Claim
16 words
An alloy as set forth in claim 1 wherein any aluminum content does not exceed 0.05%.
Claim 5
Dependent Claim
75 words
An alloy as set forth in claim 1 containing 35% to 39% nickel, 12% to 16% cobalt, 1.2% to 1.8% titanium, 3.7% to 4.8% columbium plus 1/2 tantalum, up to 1% manganese, up to 1% chromium, up to 0.10% aluminum and characterized in the age-hardened condition by an inflection temperature of at least 780° F., an expansion coefficient not greater than 4.5×10 -6 /°F. and a room temperature yield strength of at least 130,000 psi.
Claim 6
Dependent Claim
103 words
An alloy consisting essentially of 34% to 55.3% nickel, up to 25.2% cobalt, 1% to 2% titanium, 1.5% to 11% metal from the group columbium, tantalum and mixtures thereof in an amount providing that the total of columbium plus 1/2 tantalum is 1.5% to 5.5% of the alloy, up to 2% manganese and up to 1% chromium, up to 0.03% boron and balance essentially iron with any presence of aluminum being restricted to 0.20% or lower and wherein the composition is proportioned according to the following relationships A, B and C A--(%Ni)+0.84(%Co)-1.7(%Ti-%Al)+0.42(%Mn+Cr) at most 51.5 B--(%Ni)+1.1(%Co)-1.0(%Ti)-1.8(%Mn+%Cr)-0.33(%Cb+1/2Ta) at least 44.4 C--(%Cb+1/2%Ta)(%Ti)-0.33(%Cr) at least 2.7.
Claim 7
Dependent Claim
103 words
An alloy consisting essentially of 34% to 55.3% nickel, up to 25.2% cobalt, 1% to 2% titanium, 1.5% to 11% metal from the group columbium, tantalum and mixtures thereof in an amount providing that the total of columbium plus 1/2 tantalum is 1.5% to 5.5% of the alloy, up to 2% manganese and up to 1% chromium, up to 0.03% boron and balance essentially iron with any presence of aluminum being restricted to 0.20% or lower and wherein the composition is proportioned according to the following relationships A, B and C A--(%Ni)+0.84(%Co)-1.7(%Ti-%Al)+0.42(%Mn+Cr) at most 51.5 B--(%Ni)+1.1(%Co)-1.0(%Ti)-1.8(%Mn+%Cr)-0.33(%Cb+1/2Ta) at least 44.4 C--(%Cb+1/2%Ta)(%Ti)-0.33(%Cr) at least 2.7.
Claim 8
Dependent Claim
13 words
An alloy as set forth in claim 5 containing less than 0.10% aluminum.
Claim 9
Dependent Claim
13 words
An alloy as set forth in claim 5 containing less than 0.05% aluminum.
Claim 10
Dependent Claim
32 words
An alloy as set forth in claim 5 proportioned to provide that Rel. A is not greater than 47.5, Rel. B is at least 48.8 and Rel. C is at least 4.8.
Claim 11
Dependent Claim
19 words
An alloy as set forth in claim 5 wherein the total of nickel plus cobalt is 51% to 53%.
Claim 12
Dependent Claim
34 words
An alloy set forth in claim 5 wherein the total of nickel plus cobalt is 51% to 53%, the titanium content is about 1.5%, and the total of manganese plus chromium is about 0.3%.
Claim 13
Dependent Claim
13 words
An alloy as set forth in claim 5 containing at least 10% cobalt.
Claim 14
Dependent Claim
26 words
An alloy as set forth in claim 5 containing at least 1.5% columbium and wherein any tantalum present does not exceed 10% of the columbium content.
Claim 15
Dependent Claim
26 words
An alloy as set forth in claim 5 containing 3.7% to 4.8% columbium and wherein any tantalum present does not exceed 10% of the columbium content.
Claim 16
Dependent Claim
13 words
An alloy as set forth in claim 5 containing 0.003% to 0.012% boron.
Claim 17
Dependent Claim
52 words
An alloy as set forth in claim 5 containing 35% to 39% nickel, 12% to 16% cobalt, 1.2% to 1.8% titanium, 3.7% to 4.8% columbium plus 1/2 tantalum, up to 1% manganese, up to 1% chromium, up to 0.012% boron, and balance essentially iron with any aluminum restricted to 0.1% or lower.
Claim 18
Dependent Claim
13 words
An alloy as set forth in claim 15 containing at least 0.003% boron.
Claim 19
Dependent Claim
43 words
A wrought-and-age hardened alloy product characterized by the alloy composition set forth in claim 5, an inflection temperature of at least 650° F., an expansion coefficient of 5.5×10 -6 /°F. or lower and a room temperature yield strength of at least 110,000 psi.
Claim 20
Dependent Claim
20 words
A product as set forth in claim 17 having a recrystallized grain structure of ASTM size No. 2 or finer.
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |