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US4050928A
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Corrosion-resistant matrix-strengthened alloy
Assignee: Huntington Alloys Corp
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Filing: 1976-02-17
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Granted: 1977-09-27
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Expires: 1996-02-17
Abstract
Abstract Iron-based alloy composition containing special proportions of nickel, chromium, aluminum, copper and carbon provides good corrosion-resistance characteristics for service in caustic media, e.g., sodium hydroxide, chloride media, e.g., magnesium chloride, caustic-chloride media, e.g., sodium hydroxide-sodium chloride mixtures, and also when exposed to some acid media, e.g., nitric acid. Special utility particularly includes resistance to stress-corrosion-cracking in hot caustic and chloride media. Alloy has good workability for production of wrought products such as plate, bar and sheet and is also suitable for making corrosion-resistant castings and welded structures, e.g., chemical plant equipment.
Inventors
- 👤 James Roy Crum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:31
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
An alloy consisting essentially of 18% to 30% nickel and 20% to 30% chromium with the nickel-to-chromium ratio of up to 1.0, 1.7% to about 3% aluminum, 1% to about 5% copper, 0.03% to 0.08% carbon, up to 0.6% silicon, up to about 1.5% manganese, up to 0.06% calcium and balance essentially iron in an amount at least 44% of the alloy.
Claim 2
Dependent Claim
62 words
An alloy consisting essentially of 18% to 30% nickel and 20% to 30% chromium with the nickel-to-chromium ratio of up to 1.0, 1.7% to about 3% aluminum, 1% to about 5% copper, 0.03% to 0.08% carbon, up to 0.6% silicon, up to about 1.5% manganese, up to 0.06% calcium and balance essentially iron in an amount at least 44% of the alloy.
Claim 3
Dependent Claim
16 words
An alloy as set forth in claim 1 having a nickel-to-chromium ratio of 0.6 to 0.8.
Claim 4
Dependent Claim
24 words
An alloy as set forth in claim 1 wherein the nickel content is 18% to 24% and the chromium content is 22.5% to 30%.
Claim 5
Dependent Claim
16 words
An alloy as set forth in claim 1 wherein the aluminum content is 1.7% to 2.2%.
Claim 6
Dependent Claim
16 words
An alloy as set forth in claim 1 wherein the copper content is 1% to 1.8%.
Claim 7
Dependent Claim
26 words
An alloy as set forth in claim 1 containing 18% to 20% nickel, 25% to 28% chromium, 1.7% to 2.2% aluminum and 1% to 1.8% copper.
Claim 8
Dependent Claim
28 words
An alloy as set forth in claim 1 containing about 19% nickel, about 26% chromium, about 2% aluminum, about 1.4% copper, about 0.75% manganese and about 0.3% silicon.
Claim 9
Dependent Claim
18 words
A product composed of the alloy set forth in claim 1 and characterized by a wrought metal microstructure.
Claim 10
Dependent Claim
24 words
An annealed wrought product composed of the alloy set forth in claim 1 and having a grain size of ASTM 8 to ASTM 10.
Claim 11
Dependent Claim
21 words
A cold-worked and annealed metal product composed of the alloy set forth in claim 1 and characterized by a multiphase microstructure.
Claim 12
Dependent Claim
18 words
An alloy as set forth in claim 1 wherein any presence of molybdenum does not exceed 0.2% molybdenum.
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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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |