Patent US4026699A successfully refreshed from Google Patents.
US4026699A
Expired / Lapsed
US
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Matrix-stiffened heat and corrosion resistant alloy
Assignee: Huntington Alloys Corp
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Filing: 1976-02-02
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Granted: 1977-05-31
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Expires: 1996-02-02
Abstract
Abstract Matrix-stiffened nickel-iron-chromium-columbium solid-solution alloy with excellent metallurgical stability has heat-resistant and corrosion resistant characteristics especially useful for articles needed to sustain stress in long-time service at elevated temperatures, particularly including superheater tubing in steam power plants. Alloy also has good workability and thermal response characteristics for commercial production of heat-treated wrought products.
Inventors
- 👤 Herbert Louis Eiselstein
- 👤 Edward Frederick Clatworthy
- 👤 Darrell Franklin Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:13
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/48
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
An alloy consisting essentially of 17% to 22% chromium, nickel in an amount up to 44% and at least sufficient to satisfy the relationship % Ni equal at least 4/3(% Cr) plus 8.8 1.75% to 3.0% columbium, up to about 1% manganese, up to about 1% silicon, up to about 0.1% carbon, up to about 0.5% titanium provided the total of % Ti plus 0.216(% Cb) does not exceed 0.85%, up to about 0.5% aluminum and balance iron with any presence of molybdenum and tungsten not exceeding 0.5% molybdenum and 0.5% tungsten.
Claim 2
Dependent Claim
92 words
An alloy consisting essentially of 17% to 22% chromium, nickel in an amount up to 44% and at least sufficient to satisfy the relationship % Ni equal at least 4/3(% Cr) plus 8.8 1.75% to 3.0% columbium, up to about 1% manganese, up to about 1% silicon, up to about 0.1% carbon, up to about 0.5% titanium provided the total of % Ti plus 0.216(% Cb) does not exceed 0.85%, up to about 0.5% aluminum and balance iron with any presence of molybdenum and tungsten not exceeding 0.5% molybdenum and 0.5% tungsten.
Claim 3
Dependent Claim
13 words
An alloy as set forth in claim 1 containing at least 35% nickel.
Claim 4
Dependent Claim
13 words
An alloy as set forth in claim 1 containing 38% to 42% nickel.
Claim 5
Dependent Claim
30 words
An alloy as set forth in claim 1 containing 38% to 42% nickel, 18% to 22% chromium, 1.75% to 2.25% columbium, 0.02% to 0.07% carbon and 0.1% to 0.5% titanium.
Claim 6
Dependent Claim
25 words
An alloy as set forth in claim 1 containing about 40% nickel, about 20% chromium, about 2% columbium, about 0.05% carbon and about 0.3% titanium.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |