US4671931A
Expired / Lapsed
US
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Nickel-chromium-iron-aluminum alloy
Assignee: Haynes International Inc
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Filing: 1984-05-11
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Granted: 1987-06-09
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Expires: 2004-05-11
Abstract
Abstract A yttrium-free, nickel-chromium-iron-aluminum alloy characterized by excellent oxidation resistance at very high temperatures. The alloy consists essentially of, by weight, from 14 to 18% chromium, from 4 to 6% aluminum, from 1.5 to 8% iron, up to 12% cobalt, up to 1% manganese, up to 1% molybdenum, up to 1% silicon, up to 0.25% carbon, up to 0.03% boron, up to 1% tungsten, up to 0.5% tantalum, up to 0.2% titanium, up to 0.5% hafnium, up to 0.2% zirconium, up to 0.2% rhenium, balance essentially nickel. The nickel plus the cobalt content is at least 66%.
Inventors
- 👤 Robert B. Herchenroeder
- 👤 Krishna V. Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:22
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
102 words
A yttrium-free high-temperature, oxidationresistant alloy consisting essentially of, by weight, from 14 to 18% chromium, from 1.5 to 8% iron 0.005 to 0.2% zirconium. 4.1 to 6% aluminum, up to 12% cobalt, up to 1% manganese, up to 1% molybdenum, up to 1% silicon, up to 0.25% carbon, up to 0.03% boron, up to 1% tungsten, up to 0.5% tantalum, up to 0.2% titanium, up to 0.5% hafnium, up to 0.2% zirconium, up to 0.2% rhenium, said nickel plus said cobalt being at least 66% and the balance essentially nickel plus normal impurities wherein yttrium is not added as an alloying element.
Claim 2
Dependent Claim
102 words
A yttrium-free high-temperature, oxidationresistant alloy consisting essentially of, by weight, from 14 to 18% chromium, from 1.5 to 8% iron 0.005 to 0.2% zirconium. 4.1 to 6% aluminum, up to 12% cobalt, up to 1% manganese, up to 1% molybdenum, up to 1% silicon, up to 0.25% carbon, up to 0.03% boron, up to 1% tungsten, up to 0.5% tantalum, up to 0.2% titanium, up to 0.5% hafnium, up to 0.2% zirconium, up to 0.2% rhenium, said nickel plus said cobalt being at least 66% and the balance essentially nickel plus normal impurities wherein yttrium is not added as an alloying element.
Claim 3
Dependent Claim
12 words
An alloy according to claim 1, having from 15 to 17% chromium.
Claim 4
Dependent Claim
12 words
An alloy according to claim 1, having from 4.1 to 5.1% aluminum.
Claim 5
Dependent Claim
12 words
An alloy according to claim 1, having from 2 to 6% iron.
Claim 6
Dependent Claim
11 words
An alloy according to claim 1, having up to 0.8% manganese.
Claim 7
Dependent Claim
11 words
An alloy according to claim 1, having up to 0.2% silicon.
Claim 8
Dependent Claim
11 words
An alloy according to claim 1, having up to 2% cobalt.
Claim 9
Dependent Claim
16 words
An alloy according to claim 1, having up to 0.1% carbon and up to 0.015% boron.
Claim 10
Dependent Claim
20 words
An alloy according to claim 1, having up to 1% of elements from the group consisting of molybdenum and tungsten.
Claim 11
Dependent Claim
22 words
An alloy according to claim 1, having up to 0.2% of elements from the group consisting of tantalum, titanium, hafnium and rhenium.
Claim 12
Dependent Claim
16 words
An alloy according to claim 1, having at least 5% aluminum and at least 3% iron.
Claim 13
Dependent Claim
19 words
An alloy according to claim 11, wherein said iron content is in accordance with the relationship Fe≧3+4 (% Al-5).
Claim 14
Dependent Claim
16 words
An alloy according to claim 1, having a nickel plus cobalt content of at least 71%.
Claim 15
Dependent Claim
9 words
An alloy according to claim 1, in wrought form.
Claim 16
Dependent Claim
16 words
An article for use as hardware in ceramic kilns, made from the alloy of claim 1.
Claim 17
Dependent Claim
17 words
An article for use as hardware in heat treating furnaces, made from the alloy of claim 1.
References Cited (Backward Citations)
US2460590A
Cited
US4460542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |