Patent US4946519A successfully refreshed from Google Patents.
US4946519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-processed non-oriented electromagnetic steel strip having low core loss and high magnetic permeability, and method of making
Assignee: JFE Steel Corp
•
Filing: 1988-06-16
•
Granted: 1990-08-07
•
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 19:07
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.
References Cited (Backward Citations)
US3873380A
Cited
JPS4938814A
Cited
US3940299A
Cited
JPS5174923A
Cited
US4046602A
Cited
US4204890A
Cited
JPS569356A
Cited
JPS5634616A
Cited
JPS5735628A
Cited
US4529453A
Cited
US4615750A
Cited
JPS6167753A
Cited
US4772341A
Cited
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 |