US4487743A
Expired / Lapsed
US
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Controlled expansion alloy
Assignee: Huntington Alloys Corp
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Filing: 1982-08-20
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Granted: 1984-12-11
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Expires: 2002-08-20
Abstract
Abstract In an age hardenable controlled expansion alloy essentially devoid of chromium, the combination of short term tensile properties and elevated temperature properties, particularly notch rupture strength, are improved by the inclusion therein of silicon in an amount leass than 1%.
Inventors
- 👤 John S. Smith
- 👤 Darrell F. Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:59
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/10; C22C38/105
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
An age hardenable alloy characterized by controlled expansion properties with an inflection temperature of at least 625.° F. and a coefficient of expansion between ambient and inflection temperatures of 5.5×10 -6 per °F. or less, high strength and good notch rupture strength consisting essentially of about 34% to 55% nickel, up to about 25% cobalt, about 1% to 2% titanium, about 1.5% to 5.5% columbium, about 0.25% to 1% silicon, not more than about 0.2% aluminum, not more than about 0.1% carbon and the balance essentially iron.
Claim 2
Dependent Claim
87 words
An age hardenable alloy characterized by controlled expansion properties with an inflection temperature of at least 625.° F. and a coefficient of expansion between ambient and inflection temperatures of 5.5×10 -6 per °F. or less, high strength and good notch rupture strength consisting essentially of about 34% to 55% nickel, up to about 25% cobalt, about 1% to 2% titanium, about 1.5% to 5.5% columbium, about 0.25% to 1% silicon, not more than about 0.2% aluminum, not more than about 0.1% carbon and the balance essentially iron.
Claim 3
Dependent Claim
37 words
An alloy in accordance with claim 1 having an inflection temperature of at least about 750° F. and a coefficient of expansion at temperatures between ambient and the inflection temperature of 4.5×10 -6 per °F. or lower.
Claim 4
Dependent Claim
44 words
An alloy in accordance with claim 1 containing about 35% to 39% nickel, about 12% to 16% cobalt, about 0.3% to 0.5% silicon, not more than about 0.1% aluminum, about 1.2% to 1.8% titanium, about 4.3% to 5.2% columbium and the balance essentially iron.
Claim 5
Dependent Claim
23 words
An alloy in accordance with either of claims 1 or 3 having the ingredients thereof controlled in accordance with the relationships: COE=-8.698+1.888(%C)+0.367(%Mn+%Cu)+0.145(%Si+%Cr)+0.2683(%Ni)+0.2481(%Co)-0.392(%Ti) IT=-804.4+306.7(%C)-39.8(%Si+%Cr)+32.8(%Ni)+31.9(%Co)-37.8(%Ti).
Claim 6
Dependent Claim
28 words
An alloy in accordance with either claims 1 or 3 having the ingredients thereof controlled in accordance with the relationships: A=(%Ni)+0.93(%Co)-1.46(%Ti)+0.54(%Si+%Cr)+1.37(%Mn+%Cu)+7.04(%C) at most 52.9 B=(%Ni)+0.97(%Co)-1.15(%Ti)-1.21(%Si+%Cr)+9.35(%C) at least 43.6.
Claim 7
Dependent Claim
27 words
An alloy in accordance with either claims 1 or 3 proportioned to provide that relationship A is at most 49.2 and relationship B is at least 47.4.
Claim 8
Dependent Claim
15 words
An alloy in accordance with claim 1 which contains about 0.3% to about 0.7% silicon.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |