US4946519A
Expired / Lapsed
US
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Semi-processed non-oriented electromagnetic steel strip having low core loss and high magnetic permeability, and method of making
Assignee: JFE Steel Corp
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Filing: 1988-06-16
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Granted: 1990-08-07
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Expires: 2008-06-16
Abstract
Abstract A semi-processed non-oriented electromagnetic steel strip having low core loss and high magnetic permeability is provided which consists essentially of, in % by weight, up to 0.02% of C, 0.2 to 2.0% of Si, 0.1 to 0.6% of Al, 0.02 to 0.10% of P, 0.5 to 1.5% of Mn, 0.1 to 1.0% of Ni, and optionally up to 0.6% of Cu, and optionally 0.01 to 0.2% of Sb and/or Sn, and a balance of iron and inevitable impurities. Magnetic properties are further improved when it is manufactured by hot rolling a slab having the composition at a temperature of from 1,100° to 1,200° C., completing hot finish rolling at a temperature of at least 700° C. in the austenite region, annealing the strip at a temperature from 800° to 880° C. for at least one hour, cold rolling and annealing the strip, and optionally, skin pass rolling with a reduction of 2 to 12%.
Inventors
- 👤 Atsuhito Honda
- 👤 Michiro Komatsubara
- 👤 Ko Matsumura
- 👤 Keiji Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:51
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1222; C21D8/1244
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.21 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, and a balance of iron and inevitable impurities.
Claim 2
Dependent Claim
57 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.21 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, and a balance of iron and inevitable impurities.
Claim 3
Dependent Claim
61 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.21 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, Cu: up to 0.6%, and a balance of iron and inevitable impurities.
Claim 4
Dependent Claim
61 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.21 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, Cu: up to 0.6%, and a balance of iron and inevitable impurities.
Claim 5
Dependent Claim
67 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.1 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, one or both of Sb and Sn: 0.01 to 0.2%, and a balance of iron and inevitable impurities.
Claim 6
Dependent Claim
67 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.1 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, one or both of Sb and Sn: 0.01 to 0.2%, and a balance of iron and inevitable impurities.
Claim 7
Dependent Claim
71 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.1 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, Cu: up to 0.6%, one or both of Sb and Sn: 0.01 to 0.2%, and a balance of iron and inevitable impurities.
Claim 8
Dependent Claim
71 words
A semi-processed non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, said strip consisting essentially of, in % by weight, C: up to 0.02%, Si: 0.2 to 2.0%, Al: 0.1 to 0.6%, P: 0.02 to 0.10%, Mn: 0.5 to 1.5%, Ni: 0.1 to 1.0%, Cu: up to 0.6%, one or both of Sb and Sn: 0.01 to 0.2%, and a balance of iron and inevitable impurities.
Claim 9
Dependent Claim
26 words
A semi-processed non-oriented electromagnetic steel strip as recited in claim 1, wherein nickel is present in an amount sufficient to improve magnetic properties of said strip.
Claim 10
Dependent Claim
26 words
A semi-process non-oriented electromagnetic steel strip as recited in claim 2, wherein nickel is present in an amount sufficient to improve magnetic properties of said strip.
Claim 11
Dependent Claim
26 words
A semi-processed non-oriented electromagnetic steel strip as recited in claim 3, wherein nickel is present in an amount sufficient to improve magnetic properties of said strip.
Claim 12
Dependent Claim
26 words
A semi-processed non-oriented electromagnetic steel strip as recited in claim 4, wherein nickel is present in an amount sufficient to improve magnetic properties of said strip.
Claim 13
Dependent Claim
23 words
A semi-processed non-oriented electromagnetic steel strip as recited in claim 1, wherein nickel is present in an amount greater than 0.1% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |