US4066447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low expansion superalloy
Assignee: Huntington Alloys Corp
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Filing: 1976-07-08
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Granted: 1978-01-03
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Expires: 1996-07-08
Abstract
Abstract Nickel-iron and nickel-iron-cobalt alloys contain chromium and gamma-prime hardening elements in proportions balanced according to special compositional relationships providing desired thermal expansion, inflection temperature, strength and ductility characteristics, particularly including notch strength needed in machinery and structures subjected in use to varying temperatures and thermal gradients where operating temperatures become elevated above 500 DEG F.
Inventors
- 👤 Darrell Franklin Smith, Jr.
- 👤 Edward Frederick Clatworthy
- 👤 Donald Edward Wenschhof, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:13
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058; C22C38/00; C22C38/18; C22C38/40; C22C38/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
An alloy consisting essentially of 30% to 57% nickel, 1.7% to 8.3% chromium, 1 to 2% titanium, metal from the group columbium, tantalum and mixtures thereof in proportions providing the total percentage of columbium plus one-half the percentage of tantalum is 1.5 to 5%, up to 31% cobalt, up to 1.5% aluminum, up to 0.2% carbon, up to about 2% manganese, up to about 1% silicon, up to 0.03% boron and balance essentially iron in an amount of at least 34% of the alloy and having the composition proportioned in accordance with the following four relationships A, B, C' and D' whereby: A. %ni+0.88(%Co)-1.70(%Al)-2.01(%Ti)+ 0.26(%Mn+% Cr) equal up to 51.8 B. %ni+1.13(%Co)-2.69(%Al)-1.47(%Ti)-1.93(%Mn)- 2.51(%Cr)+1.87(√%Cr) at least 40.8 C. %al+1.3(%Ti)+1.44(%Cb+1/2%Ta)-0.12(%Cb+1/2%Ta) 2 - 0.37(%Cr)+0.03(%Cr) 2 at least 3.81 D. %al+1.3(%Ti)+0.25(%Cb+1/2% Ta)-0.125(%Cr) up to 3.18
Claim 2
Dependent Claim
131 words
An alloy consisting essentially of 30% to 57% nickel, 1.7% to 8.3% chromium, 1 to 2% titanium, metal from the group columbium, tantalum and mixtures thereof in proportions providing the total percentage of columbium plus one-half the percentage of tantalum is 1.5 to 5%, up to 31% cobalt, up to 1.5% aluminum, up to 0.2% carbon, up to about 2% manganese, up to about 1% silicon, up to 0.03% boron and balance essentially iron in an amount of at least 34% of the alloy and having the composition proportioned in accordance with the following four relationships A, B, C' and D' whereby: A. %ni+0.88(%Co)-1.70(%Al)-2.01(%Ti)+ 0.26(%Mn+% Cr) equal up to 51.8 B. %ni+1.13(%Co)-2.69(%Al)-1.47(%Ti)-1.93(%Mn)- 2.51(%Cr)+1.87(√%Cr) at least 40.8 C. %al+1.3(%Ti)+1.44(%Cb+1/2%Ta)-0.12(%Cb+1/2%Ta) 2 - 0.37(%Cr)+0.03(%Cr) 2 at least 3.81 D. %al+1.3(%Ti)+0.25(%Cb+1/2% Ta)-0.125(%Cr) up to 3.18
Claim 3
Dependent Claim
16 words
An alloy as set forth in claim 1 having a chromium content not exceeding 5.5% chromium.
Claim 4
Dependent Claim
13 words
An alloy as set forth in claim 1 containing 1.8% to 4.8% chromium.
Claim 5
Dependent Claim
13 words
An alloy as set forth in claim 1 containing at least 7% cobalt.
Claim 6
Dependent Claim
14 words
An alloy as set forth in claim 1 containing 0.1% to about 0.8% aluminum.
Claim 7
Dependent Claim
13 words
An alloy as set forth in claim 1 containing 0.002% to 0.012% boron.
Claim 8
Dependent Claim
14 words
An alloy as set forth in claim 1 containing not more than 0.5% silicon.
Claim 9
Dependent Claim
16 words
An alloy as set forth in claim 1 having a nickel content not exceeding 55% nickel.
Claim 10
Dependent Claim
41 words
An alloy as set forth in claim 1 wherein the total of columbium plus one-half tantalum is at least 2.2%, the nickel content does not exceed 55%, the chromium content does not exceed 5.5% and relationship C is at least 4.9.
Claim 11
Dependent Claim
54 words
An alloy as set forth in claim 1 containing 36% to 40 nickel, 12% to 16% cobalt, 1.8 to 3.2% chromium, 3 to 4% columbium, 1.2 to 1.6% titanium, 0.1 to 0.4% aluminum, up to 0.06 carbon, 0.002 to 0.012% boron and balance essentially iron in an amount at least 36% of the alloy.
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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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |