US4080202A
Expired / Lapsed
US
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Cobalt base alloy
Assignee: Hitachi Ltd
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Filing: 1976-03-12
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Granted: 1978-03-21
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Expires: 1996-03-12
Abstract
Abstract A cobalt base alloy consisting essentially of, in weight percent, about 0.1% to about 0.5% carbon, about 0.3% to about 2.0% silicon, about 0.3% to about 2.0% manganese, about 5.0% to about 15.0% nickel, about 26.0% to about 35.0% chromium, about 3.0% to about 10.0% tungsten, about 0.003% to about 0.1% boron, about 0.01% to about 1.0% titanium, about 0.01% to about 1.0% niobium and optionally about 0.05% to about 1.0% mischmetal and the balance being essentially cobalt together with impurities and incidental elements normally associated with a cobalt base alloy, which has high strength and high ductility even at high temperatures and is especially suitable as a material to be used at high temperatures under high thermal stress, such as a material for a nozzle of a gas turbine engine.
Inventors
- 👤 Yutaka Fukui
- 👤 Tetsuo Kashimura
- 👤 Fumio Hataya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:52
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A cobalt base alloy consisting essentially of, in weight percent, about 0.2% to about 0.3% carbon, about 0.3% to about 2.0% silicon, about 0.3% to about 2.0% manganese, about 5.0% to about 15.0% nickel, about 26% to about 35% chromium, about 6.5% to about 7.5% tungsten, about 0.003% to about 0.1% boron, about 0.1% to 0.4% titanium and about 0.1% to about 0.6% niobium, and the balance being essentially cobalt together with impurities and incidental elements normally associated with a cobalt base alloy.
Claim 2
Dependent Claim
83 words
A cobalt base alloy consisting essentially of, in weight percent, about 0.2% to about 0.3% carbon, about 0.3% to about 2.0% silicon, about 0.3% to about 2.0% manganese, about 5.0% to about 15.0% nickel, about 26% to about 35% chromium, about 6.5% to about 7.5% tungsten, about 0.003% to about 0.1% boron, about 0.1% to 0.4% titanium and about 0.1% to about 0.6% niobium, and the balance being essentially cobalt together with impurities and incidental elements normally associated with a cobalt base alloy.
Claim 3
Dependent Claim
87 words
A cobalt base alloy consisting essentially of, in weight percent, about 0.2% to about 0.3% carbon, about 0.3% to about 2.0% silicon, about 0.3% to about 2.0% manganese, about 5.0% to about 15.0% nickel, about 26.0% to about 35.0% chromium, about 6.5% to about 7.5% tungsten, about 0.003% to about 0.1% boron, about 0.1% to about 0.4% titanium, about 0.1% to about 0.6% niobium and about 0.3% mischmetal, and the balance being essentially cobalt together with impurities and incidental elements normally associated with a cobalt base alloy.
Claim 4
Dependent Claim
87 words
A cobalt base alloy consisting essentially of, in weight percent, about 0.2% to about 0.3% carbon, about 0.3% to about 2.0% silicon, about 0.3% to about 2.0% manganese, about 5.0% to about 15.0% nickel, about 26.0% to about 35.0% chromium, about 6.5% to about 7.5% tungsten, about 0.003% to about 0.1% boron, about 0.1% to about 0.4% titanium, about 0.1% to about 0.6% niobium and about 0.3% mischmetal, and the balance being essentially cobalt together with impurities and incidental elements normally associated with a cobalt base alloy.
Claim 5
Dependent Claim
30 words
A cobalt base alloy as set forth in claim 2, wherein said nickel is 9.5% to 11.5%, said chromium is 28.5% to 30.5%, and said boron is 0.005% to 0.015%.
Claim 6
Dependent Claim
89 words
A cobalt base alloy consisting essentially of, in weight percent, about 0.2% to about 0.3% carbon, about 0.3% to about 2.0% silicon, about 0.3% to about 2.0% manganese, about 5.0% to about 15.0% nickel, about 26% to about 35% chromium, about 6.5% to about 7.5% tungsten, about 0.003% to about 0.1% boron, about 0.1% to 0.4% titanium, about 0.05% to about 1.0% mischmetal, and about 0.1% to about 0.6% niobium, and the balance being essentially cobalt together with impurities and incidental elements normally associated with a cobalt base alloy.
Claim 7
Dependent Claim
89 words
A cobalt base alloy consisting essentially of, in weight percent, about 0.2% to about 0.3% carbon, about 0.3% to about 2.0% silicon, about 0.3% to about 2.0% manganese, about 5.0% to about 15.0% nickel, about 26% to about 35% chromium, about 6.5% to about 7.5% tungsten, about 0.003% to about 0.1% boron, about 0.1% to 0.4% titanium, about 0.05% to about 1.0% mischmetal, and about 0.1% to about 0.6% niobium, and the balance being essentially cobalt together with impurities and incidental elements normally associated with a cobalt base alloy.
References Cited (Backward Citations)
US3582320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |