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US4203784A
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Grain oriented electromagnetic steel sheet
Assignee: Nippon Steel Corp
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Filing: 1978-05-04
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Granted: 1980-05-20
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Expires: 1998-05-04
Abstract
Abstract A grain oriented electromagnetic steel sheet has a plurality of linear fine strains having a traverse section of a concave hollow on it in the steel sheet shows a very low iron loss in its use.
Inventors
- 👤 Katsuro Kuroki
- 👤 Osamu Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:11
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; H01F1/14783; C; C21; C21D; C21D8/00; C21D8/12; C21D8/1294
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
124 words
A method of treating a grain oriented steel to improve the iron loss which comprises treating a grain oriented electromagnetic steel sheet containing a glassy film formed by an annealing separator on the surface thereof and which sheet has been subjected to a finished annealing operation by imparting a plurality of linear strains to the base steel sheet through the glassy film by forcefully moving a rotatable body over the glassy film, said linear fine strains being formed at an angle of 45° or more to be the rolling direction of the steel sheet said linear strain having a depth of 5 μm or less, a width of 600 μm or less and wherein the distance between adjacent strains is 2.5 to 15 mm.
Claim 2
Independent Claim
124 words
A method of treating a grain oriented steel to improve the iron loss which comprises treating a grain oriented electromagnetic steel sheet containing a glassy film formed by an annealing separator on the surface thereof and which sheet has been subjected to a finished annealing operation by imparting a plurality of linear strains to the base steel sheet through the glassy film by forcefully moving a rotatable body over the glassy film, said linear fine strains being formed at an angle of 45° or more to be the rolling direction of the steel sheet said linear strain having a depth of 5 μm or less, a width of 600 μm or less and wherein the distance between adjacent strains is 2.5 to 15 mm.
Claim 3
Dependent Claim
71 words
A method according to claim 1 in which a secondary coating is formed over said glassy film and the rotatable body is forcefully moved over the secondary coating to impart the linear fine strains to the base steel sheet through the coatings, said secondary coating being selected from the group consisting of compounds of phosphoric acid, organic compounds and an ultraviolet ray-hardening resin to improve the insulation of the steel sheet.
Claim 4
Dependent Claim
19 words
A method according to claim 1, wherein the rotatable body is a spherical roller having a convex contact surface.
Claim 5
Dependent Claim
23 words
A method according to claim 1 in which the direction of the strains to be imparted is substantially traverse to the rolling direction.
Claim 6
Dependent Claim
26 words
A method according to claim 1 in which the excitation characteristics (B8) of the base steel sheet subjected to the finishing annealing is 1.90 or more.
Claim 7
Dependent Claim
17 words
A method according to claim 11 wherein the distance between adjacent strains is 2.5 to 10 mm.
Claim 8
Dependent Claim
110 words
A grain oriented magnetic steel sheet having a glassy film on the surface thereof, which steel sheet has been subjected to a finishing annealing, said steel sheet containing silicon in an amount of 4.0% or less and being characterized in that it contains a plurality of strains imparted through the glassy film by a rotatable body, in which the strains have a depth of 5 μm or less, a width of 600 μm or less and the distance between the adjacent strains being 2.5 to 15 mm and wherein the direction of the fine strains is at an angle of 30° or more to the rolling direction of the steel.
Claim 9
Dependent Claim
110 words
A grain oriented magnetic steel sheet having a glassy film on the surface thereof, which steel sheet has been subjected to a finishing annealing, said steel sheet containing silicon in an amount of 4.0% or less and being characterized in that it contains a plurality of strains imparted through the glassy film by a rotatable body, in which the strains have a depth of 5 μm or less, a width of 600 μm or less and the distance between the adjacent strains being 2.5 to 15 mm and wherein the direction of the fine strains is at an angle of 30° or more to the rolling direction of the steel.
Claim 10
Dependent Claim
23 words
A grain oriented electromagnetic steel sheet according to claim 7 in which the direction of the strain is traverse to the rolling direction.
Claim 11
Dependent Claim
30 words
A grain oriented electromagnetic steel sheet according to claim 7 in which the excitation characteristics (B8) of the base steel sheet subjected to the final annealing is 1.90 or more.
Claim 12
Dependent Claim
48 words
A grain oriented electromagnetic steel sheet according to claim 7 in which the base steel sheet has a further coating consisting essentially of one member of the group consisting of compounds of phosphoric acid system, compounds of organic system and a ultraviolet ray hardening resin on the film.
Claim 13
Dependent Claim
30 words
A grain oriented electromagnetic steel sheet according to claim 7 in which the direction of the fine strains is 45° or more to the rolling direction of the steel sheet.
Claim 14
Dependent Claim
18 words
A steel sheet according to claim 7, wherein the distance between adjacent strains is 2.5 to 10 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-20 | 1983-11-19 | 1984-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-20 | 1987-11-19 | 1988-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-20 | 1991-11-19 | 1992-05-20 | $7700.00 | Window Closed / Lapsed |