Patent US4255215A successfully refreshed from Google Patents.
US4255215A
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Oriented low-alloy iron containing critical amounts of silicon and chromium
Assignee: ABB Inc USA
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Filing: 1979-05-11
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Granted: 1981-03-10
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Expires: 1999-05-11
Abstract
Abstract This is a low-alloy iron having desirable magnetic characteristics suitable for electrical applications such as transformer cores. This material has improved texture and reduced core losses. The alloys contain 0.6-1.0% silicon and 0.4-0.8% chromium along with controlled levels of manganese, sulfur, carbon and oxygen. These alloys are preferably processed to about 0.006 inch (0.015 cm) final gauge using schedules with three coldrolling steps. B10 values above 19 kG and 17 kG losses below 0.72 watts per pound are obtained with these alloys.
Inventors
- 👤 Gary C. Rauch
- 👤 Donald R. Thornburg
- 👤 Karl Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:17
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1233; C22; C22C; C22C38/00; C22C38/18; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
69 words
An improved composition of primarily recrystallized low-alloy iron having improved magnetic characteristics having a major proportion of the grains exhibiting a (110) [001] texture and having a primary recrystallized microstructure, said alloy consisting essentially of 0.6-1.0% silicon, 0.4-0.8% chromium, up to 0.15% manganese, up to 0.001% carbon, up to 0.005% sulfur, up to about 0.01% oxygen, up to 3% cobalt, with the balance being essentially iron with incidental impurities.
Claim 2
Dependent Claim
69 words
An improved composition of primarily recrystallized low-alloy iron having improved magnetic characteristics having a major proportion of the grains exhibiting a (110) [001] texture and having a primary recrystallized microstructure, said alloy consisting essentially of 0.6-1.0% silicon, 0.4-0.8% chromium, up to 0.15% manganese, up to 0.001% carbon, up to 0.005% sulfur, up to about 0.01% oxygen, up to 3% cobalt, with the balance being essentially iron with incidental impurities.
Claim 3
Dependent Claim
36 words
The alloy of claim 1, wherein the silicon content is about 0.8% and the chromium content is about 0.6%, said alloy having core loss values at 17 kG of about 0.7 watts per pound or below.
References Cited (Backward Citations)
US436497A
Cited
US3368887A
Cited
US3849212A
Cited
US3881967A
Cited
US3892605A
Cited
US3892604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |