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US3754898A
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Austenitic iron alloys
Assignee: Individual
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Filing: 1972-01-07
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Granted: 1973-08-28
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Expires: 1992-01-07
Abstract
Abstract The production of an austenitic iron base alloy with relatively high aluminum and chromium content which forms an aluminum oxide protective film in the presence of yttrium and/or rare earth elements and has high temperature resistance.
Inventors
- 👤 Gurty J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:44
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
An austenitic alloy of iron, nickel, chromium, aluminum, and yttrium consisting essentially of 16 to 45 weight percent of nickel, 4 to 25 weight percent of chromium, 3.5 to 5.5 weight percent aluminum, 0.1 to 5 weight percent yttrium and the balance consisting essentially of iron.
Claim 2
Dependent Claim
51 words
An austenitic alloy of iron consisting essentially of nickel, chromium, aluminum, manganese, copper and yttrium which consists of 15.0 weight percent of nickel, 10.0 weight percent of chromium, 4.0 weight percent aluminum, 5.0 weight percent manganese, 1.0 weight percent copper, 1.0 weight percent yttrium and the balance consisting essentially of iron.
Claim 3
Dependent Claim
90 words
An austenitic alloy of iron consisting essentially of nickel, chromium, aluminum, yttrium and containing additions of manganese, carbon, nitrogen and copper as a partial substitution of the austenite stabilizing nickel content within the following ranges, 10.0 to 45.0 weight percent nickel, 4 to 25.0 weight percent chromium, 3.5 to 5.5 weight percent aluminum, 0.1 to 5.0 weight percent yttrium and containing 0. to 20 weight percent manganese, 0. to 0.5 weight percent carbon, 0. to 0.5 weight percent nitrogen and/or 0. to 1 weight percent copper with the balance iron.
Claim 4
Dependent Claim
106 words
An austenitic iron base alloy as described in claim 4 having improved high temperature strength and including iron, 8 to 45 weight percent nickel, 4 to 25 weight percent chromium, 3.5 to 5.5 weight percent aluminum, 0.1 to 5 weight percent yttrium, and contain 0. to 20 weight percent manganese, 0. to 0.5 weight percent carbon, 0. to 0.5 weight percent nitrogen, 0 to 1 weight percent copper, and/or as a partial substitution of the austenite stabilizing nickel content and for increased high temperature strength 0.1 to 10 weight percent tungsten and/or molybdenum, and/or 0.1 to 2 weight percent columbium and/or tantalum, titanium, zirconium or hafnium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |