US4338143A
Expired / Lapsed
US
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Non-oriented silicon steel sheet with stable magnetic properties
Assignee: Nippon Steel Corp
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Filing: 1981-03-27
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Granted: 1982-07-06
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Expires: 2001-03-27
Abstract
Abstract A non-oriented silicon steel sheet with a low watt loss value as well as uniform magnetic properties which contains 1.5-3.5% Si, an exceedingly low C content, and a low soluble Al content, and has a ratio of B to N in the range of 0.4 to 2.0, and further contains at least one rare earth element.
Inventors
- 👤 Yoshiaki Shimoyama
- 👤 Shigenobu Koga
- 👤 Katsuyki Ohba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:34
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A non-oriented silicon steel sheet having uniform magnetic properties characterized by possessing a watt loss value of 4.10 or less at 15000 gauss/50 cycle, and magnetic flux density B50 of at least 1.65 W/m 2 , said sheet consisting essentially of ≦0.015% % C, 1.5-3.5% Si, 0.05-1.0% Mn, 0.005-0.08% acid-soluble Al, ≦0.015% S, ≦0.010% O, ≦0.005% N, B in such amount that the ratio of B to N is in the range of 0.4-2.0, 0.001-0.020% of at least one rare earth element, and the remainder of Fe and unavoidable impurities.
Claim 2
Dependent Claim
90 words
A non-oriented silicon steel sheet having uniform magnetic properties characterized by possessing a watt loss value of 4.10 or less at 15000 gauss/50 cycle, and magnetic flux density B50 of at least 1.65 W/m 2 , said sheet consisting essentially of ≦0.015% % C, 1.5-3.5% Si, 0.05-1.0% Mn, 0.005-0.08% acid-soluble Al, ≦0.015% S, ≦0.010% O, ≦0.005% N, B in such amount that the ratio of B to N is in the range of 0.4-2.0, 0.001-0.020% of at least one rare earth element, and the remainder of Fe and unavoidable impurities.
Claim 3
Dependent Claim
16 words
A non-oriented silicon steel sheet according to claim 1 containing of ≦0.005% C and 0.001-0.020% Ce.
Claim 4
Dependent Claim
12 words
A non-oriented silicon steel sheet according to claim 1 containing ≦0.010% C.
References Cited (Backward Citations)
US4043805A
Cited
US3960616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |