US3930904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nickel-iron-chromium alloy wrought products
Assignee: Huntington Alloys Corp
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Filing: 1974-10-29
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Granted: 1976-01-06
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Expires: 1994-10-29
Abstract
Abstract Nickel-iron-chromium-molybdenum-columbium alloy of specially controlled composition has heat and corrosion resistance characteristics particularly useful for, inter alia, use in aqueous solutions containing chlorides.
Inventors
- 👤 Herbert L. Eiselstein
- 👤 James C. Hosier
- 👤 Ralph C. Scarberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:53
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A high strength, corrosion-resistant, wrought and heat treated nickel-chromium-molybdenum-columbium-iron alloy product having the microstructural condition that results from annealing at about 1800°F and having a fine-grain annealed microstructure characterized by grain size of ASTM 7 and finer, a metallurgically stable solid-solution austenitic phase structure that remains essentially devoid of sigma phase and resists embrittlement when heated at 1400°F., and a room temperature yield strength of at least 65,000 pounds per square inch and composed of an alloy consisting essentially of 38% to 42% nickel, 14% to 17% chromium, 5% to 7% molybdenum, 1.5% to 2.5% columbium, up to 0.08% carbon, up to 1.5% manganese and balance essentially iron in a proportion whereby iron is at least 29% and not greater than 40% of the alloy.
Claim 2
Dependent Claim
125 words
A high strength, corrosion-resistant, wrought and heat treated nickel-chromium-molybdenum-columbium-iron alloy product having the microstructural condition that results from annealing at about 1800°F and having a fine-grain annealed microstructure characterized by grain size of ASTM 7 and finer, a metallurgically stable solid-solution austenitic phase structure that remains essentially devoid of sigma phase and resists embrittlement when heated at 1400°F., and a room temperature yield strength of at least 65,000 pounds per square inch and composed of an alloy consisting essentially of 38% to 42% nickel, 14% to 17% chromium, 5% to 7% molybdenum, 1.5% to 2.5% columbium, up to 0.08% carbon, up to 1.5% manganese and balance essentially iron in a proportion whereby iron is at least 29% and not greater than 40% of the alloy.
Claim 3
Dependent Claim
12 words
A fume scrubber made of the product set forth in claim 1.
Claim 4
Dependent Claim
12 words
A propeller shaft made of the product set forth in claim 1.
Claim 5
Dependent Claim
21 words
A product as set forth in claim 1 wherein the alloy contains 39% to 40% nickel and 14.8% to 15.9% chromium.
Claim 6
Dependent Claim
19 words
A product as set forth in claim 1 wherein the alloy contains carbon in an amount not exeeding 0.05%.
Claim 7
Dependent Claim
29 words
A product as set forth in claim 1 wherein the alloy contains about 40% nickel, about 15.5% chromium, about 6% molybdenum, about 2% columbium and up to 0.05% carbon.
Claim 8
Dependent Claim
46 words
A product as set forth in claim 1 wherein the balance of essentially iron is restricted to not exceeding 0.5% copper, not exceeding 0.5% silicon, not exceeding 0.5% aluminum, not exceeding 0.5% titanium, not exceeding 0.05% calcium, not exceeding 0.015% sulfur and not exceeding 0.03% phosphorus.
Claim 9
Dependent Claim
21 words
A product as set forth in claim 7 containing 0.05% to 0.5% metal from the group aluminum, titanium and mixtures thereof.
References Cited (Backward Citations)
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US2994605A
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US3243287A
Cited
GB980357A
Cited
GB1018149A
Cited
US3547625A
Cited
US3492117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |