Patent US4318758A successfully refreshed from Google Patents.
US4318758A
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US
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Method for producing a grain-oriented magnetic steel sheet having good magnetic properties
Assignee: Nippon Steel Corp
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Filing: 1979-12-13
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Granted: 1982-03-09
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Expires: 1999-12-13
Abstract
Abstract A grain oriented magnetic steel sheet having excellent magnetic properties containing not more than 4.5% silicon, in which a <001> axis of individual grains coincides with a rolling direction of the steel sheet, a crystal plane parallel to the steel sheet surface is composed of a {h, k, o} plane which is rotated and dispersed about an axis in the rolling direction, and a tension ranging substantially from 350 to 1500 g/mm2 is given to the steel sheet in the rolling direction.
Inventors
- 👤 Katsuro Kuroki
- 👤 Kenzo Iwayama
- 👤 Takashi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:08
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1277; C21D8/1288; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A method for producing a grain oriented magnetic steel sheet having excellent magnetic properties and containing not more than 4.5% silicon, comprising hot rolling a steel slab prepared by continuous casting, subjecting the hot rolled steel sheet thus obtained to intermediate annealing, then to cold rolling by means of a grooved roll to produce a steel structure in which a <001> axis of individual grains coincides with a rolling direction of the steel sheet, a crystal plane (h, k, o) parallel to the steel sheet surface plane is rotated and dispersed about an axis in the rolling direction in a range from 0° to ±20°, subjecting the cold rolled steel sheet thus obtained to decarburizing annealing, magnesium oxide coating, final annealing and then coating the steel sheet with a coating liquid containing colloidal silica, aluminum phosphate, chromic anhydride and boric acid so as to give a tension during cooling, ranging substantially from 350 to 1500 g/mm 2 in the rolling direction to the steel sheet.
Claim 2
Independent Claim
165 words
A method for producing a grain oriented magnetic steel sheet having excellent magnetic properties and containing not more than 4.5% silicon, comprising hot rolling a steel slab prepared by continuous casting, subjecting the hot rolled steel sheet thus obtained to intermediate annealing, then to cold rolling by means of a grooved roll to produce a steel structure in which a <001> axis of individual grains coincides with a rolling direction of the steel sheet, a crystal plane (h, k, o) parallel to the steel sheet surface plane is rotated and dispersed about an axis in the rolling direction in a range from 0° to ±20°, subjecting the cold rolled steel sheet thus obtained to decarburizing annealing, magnesium oxide coating, final annealing and then coating the steel sheet with a coating liquid containing colloidal silica, aluminum phosphate, chromic anhydride and boric acid so as to give a tension during cooling, ranging substantially from 350 to 1500 g/mm 2 in the rolling direction to the steel sheet.
Claim 3
Dependent Claim
39 words
The process of claim 1 wherein the coating liquid is an aqueous coating liquid containing the solid components in the ratio of 20 parts colloidal silica, 30 parts aluminum phosphate, 6 parts chromic anhydride and 2 parts boric acid.
Claim 4
Dependent Claim
36 words
The process of claim 2 where is employed a final annealing coating composition containing on a solid basis 100 parts magnesium oxide, 5 parts titanium oxide and 0.5 parts Na 2 S 2 O 3 .
Claim 5
Dependent Claim
37 words
The process of claim 1 wherein there is employed a final annealing coating composition containing on a solid basis 100 parts magnesium oxide, 5 parts titanium oxide and 0.5 parts Na 2 S 2 O 3 .
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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) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |