US3972713A
Expired / Lapsed
US
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Sulfidation resistant nickel-iron base alloy
Assignee: CRS Holdings LLC
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Filing: 1974-09-30
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Granted: 1976-08-03
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Expires: 1994-09-30
Abstract
Abstract A sulfidation-resistant alloy having high stress-rupture strength at about 1350°-1500°F, containing about 0.02-0.08% carbon, 21-26% chromium, 52-58% nickel, 1-3.5% molybdenum, 1.75-3.25% titanium, 0.75- 2.25% aluminum, 0.50-2.00% columbium, up to 0.02% boron and the balance iron.
Inventors
- 👤 Donald R. Muzyka
- 👤 Clyde Raymond Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:01
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
87 words
A nickel-iron base alloy which is resistant to sulfidation at elevated temperatures in the range of about 1300° to 1500°F and which has good hot strength and stress rupture life at elevated temperatures up to about 1500°F when heat treated, which consists essentially by weight of about Percent
Carbon 0.02-0.08
Manganese 2 Max.
Silicon 0.25 Max.
Phosphorus 0.03 Max.
Sulfur 0.03 Max.
Chromium 21-24.5
Nickel 52-58
Molybdenum 1-3.5
Titanium 1.75-3.25
Aluminum 0.75-2.25
Columbium 0.50-2
Boron up to 0.02 and the balance being essentially iron and incidental impurities.
Claim 2
Dependent Claim
87 words
A nickel-iron base alloy which is resistant to sulfidation at elevated temperatures in the range of about 1300° to 1500°F and which has good hot strength and stress rupture life at elevated temperatures up to about 1500°F when heat treated, which consists essentially by weight of about Percent
Carbon 0.02-0.08
Manganese 2 Max.
Silicon 0.25 Max.
Phosphorus 0.03 Max.
Sulfur 0.03 Max.
Chromium 21-24.5
Nickel 52-58
Molybdenum 1-3.5
Titanium 1.75-3.25
Aluminum 0.75-2.25
Columbium 0.50-2
Boron up to 0.02 and the balance being essentially iron and incidental impurities.
Claim 3
Dependent Claim
18 words
The nickel-iron base alloy set forth in claim 1 containing about 0.02% maximum phosphorus and 0.02% maximum sulfur.
Claim 4
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 2 containing about 0.002-0.008% boron.
Claim 5
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 2 containing about 0.004-0.008% boron.
Claim 6
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 3 containing about 0.04-0.065% carbon.
Claim 7
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 3 containing about 22.0-24.5% chromium.
Claim 8
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 3 containing about 1.5-2.5% molybdenum.
Claim 9
Dependent Claim
17 words
The nickel-iron base alloy set forth in claim 3 containing about 2.25-2.75% titanium and about 1.25-1.75% aluminum.
Claim 10
Dependent Claim
21 words
The nickel-iron base alloy set forth in claim 3 in which the ratio of titanium to aluminum is greater than 1.0.
Claim 11
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 3 containing about 53-56% nickel.
Claim 12
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 3 containing about 0.75-1.50% columbium.
Claim 13
Dependent Claim
40 words
The nickel-iron base alloy set forth in claim 1 containing about Percent
Carbon 0.04-0.065
Manganese 0.25 Max.
Silicon 0.20 Max.
Phosphorus 0.02 Max.
Sulfur 0.02 Max.
Chromium 22.0-24.5
Nickel 53-56
Molybdenum 1.5-2.5
Titanium 2.25-2.75
Aluminum 1.25-1.75
Columbium 0.75-1.50
Boron 0.002-0.008.
Claim 14
Dependent Claim
17 words
The nickel-iron base alloy set forth in claim 12 containing about 0.015 maximum phosphorus and 0.015 sulfur.
Claim 15
Dependent Claim
13 words
The nickel-iron base alloy set forth in claim 12 containing about 0.004-0.008% boron.
Claim 16
Dependent Claim
28 words
The nickel-iron base alloy set forth in claim 14 containing about Percent
Carbon .063
Chromium 23.30
Nickel 54.13
Molybdenum 2.03
Titanium 2.55
Aluminum 1.43
Columbium 1.02
Boron .0062.
Claim 17
Dependent Claim
28 words
The nickel-iron base alloy set forth in claim 14 containing about Percent
Carbon .062
Chromium 23.78
Nickel 54.84
Molybdenum 1.87
Titanium 2.50
Aluminum 1.48
Columbium .99
Boron .0053.
Claim 18
Dependent Claim
19 words
The nickel-iron base alloy set forth in claim 12 containing about Percent
Manganese 0.20 Max.
Chromium 22-23.5
Nickel 54-56.
Claim 19
Dependent Claim
16 words
The nickel-iron base alloy set forth in claim 1 containing from 21% to about 23.5% chromium.
References Cited (Backward Citations)
US2570193A
Cited
US3573901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |