US4089711A
Expired / Lapsed
US
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Antiferromagnetic chromium base invar-type alloys and a method of producing the same
Assignee: Research Institute for Iron Steel and Other Metals of Tohoku University
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Filing: 1977-03-30
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Granted: 1978-05-16
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Expires: 1997-03-30
Abstract
Abstract Antiferromagnetic chromium base invar-type alloys and a method of producing the same are disclosed. These alloys are produced by adding 0.05-10 wt% of at least one rare earth element to antiferromagnetic chromium base invar-type alloy consisting of 0.5-6 wt% of iron and/or silicon, 1.5-6 wt% of cobalt and/or manganese and remainder of chromium, and then subjecting the resulting alloy ingot to a primary hot working by heating at a temperature of 800°-1200° C, and have a reduction ratio of not less than 60% and a thermal expansion coefficient of not more than 4×10 -6 /° C.
Inventors
- 👤 Hideo Saito
- 👤 Kazuaki Fukamichi
- 👤 Yoshinobu Saito
- 👤 Sakae Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:42
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
An antiferromagnetic chromium base Invar-type alloy consisting of 0.5-6% by weight of either iron or silicon or both, 1.5-6% by weight of either cobalt or manganese or both, 0.05-10% by weight of at least one rare earth element and remainder of chromium, said alloy having a reduction ratio of not less than 60% and a thermal expansion coefficient of 4×10 -6 /° C.
Claim 2
Dependent Claim
63 words
An antiferromagnetic chromium base Invar-type alloy consisting of 0.5-6% by weight of either iron or silicon or both, 1.5-6% by weight of either cobalt or manganese or both, 0.05-10% by weight of at least one rare earth element and remainder of chromium, said alloy having a reduction ratio of not less than 60% and a thermal expansion coefficient of 4×10 -6 /° C.
Claim 3
Independent Claim
101 words
A method of producing an antiferromagnetic chromium base invar-type alloy, comprising adding 0.05-10% by weight of at least one rare earth element to a melt of an antiferromagnetic chromium base invar-type alloy consisting of 0.5-6% by weight of either iron or silicon or both, 1.5-6% by weight of either cobalt or manganese or both and remainder of chromium, and then subjecting the resulting alloy ingot to a primary hot working by heating at a temperature of 800°-1200° C to provide a reduction ratio of not less than 60% and a thermal expansion coefficient of not more than 4×10 -6 /° C.
Claim 4
Independent Claim
101 words
A method of producing an antiferromagnetic chromium base invar-type alloy, comprising adding 0.05-10% by weight of at least one rare earth element to a melt of an antiferromagnetic chromium base invar-type alloy consisting of 0.5-6% by weight of either iron or silicon or both, 1.5-6% by weight of either cobalt or manganese or both and remainder of chromium, and then subjecting the resulting alloy ingot to a primary hot working by heating at a temperature of 800°-1200° C to provide a reduction ratio of not less than 60% and a thermal expansion coefficient of not more than 4×10 -6 /° C.
Claim 5
Dependent Claim
29 words
A method as claimed in claim 2, wherein said rare earth element is selected from rare earth elements, mischmetal and mother alloy consisting of chromium and rare earth elements.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 3, wherein said rare earth element is selected from the group consisting of lanthanum, yttrium, cerium, praseodymium, samarium, europium, gadolinium and dysprosium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |