US3941623A
Expired / Lapsed
US
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Method for producing a grain-oriented electrical steel sheet using separators comprising metal nitrides
Assignee: Nippon Steel Corp
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Filing: 1974-08-23
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Granted: 1976-03-02
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Expires: 1994-08-23
Abstract
Abstract Method for producing a grain-oriented electrical steel sheet or strip having uniform magnetic and film properties said method comprising applying an annealing separator containing one or more metal nitrides, such as, chromium nitride, titanium nitride and vanadium nitride to the steel sheet and annealing the steel sheet at a temperature not lower than 1,100 DEG C.
Inventors
- 👤 Kikuo Takashina
- 👤 Minoru Kitayama
- 👤 Motoharu Nakamura
- 👤 Yozo Suga
- 👤 Kiyoshi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:08
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; C21D1/00; C21D1/68; C21D1/70; C23; C23C; C23C24/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
In a method for producing a grain-oriented electrical steel sheet having highly stabilized magnetic and film properties of the type comprising cold rolling hot rolled steel sheet containing not more than 4.5% Si into a final thickness, annealing the cold rolled sheet, applying an annealing separator to the steel sheet and subjecting the thus coated steel sheet to high-temperature annealing, the improvement which comprises said annealing separator containing one or more of metal nitrides selected from the group consisting of chromium nitride, titanium nitride, vanadium nitride, and combinations thereof in an amount not less than 0.5 part by weight to 100 parts of the annealing separator, and carrying out said annealing at a temperature not lower than 1,100°C.
Claim 2
Dependent Claim
118 words
In a method for producing a grain-oriented electrical steel sheet having highly stabilized magnetic and film properties of the type comprising cold rolling hot rolled steel sheet containing not more than 4.5% Si into a final thickness, annealing the cold rolled sheet, applying an annealing separator to the steel sheet and subjecting the thus coated steel sheet to high-temperature annealing, the improvement which comprises said annealing separator containing one or more of metal nitrides selected from the group consisting of chromium nitride, titanium nitride, vanadium nitride, and combinations thereof in an amount not less than 0.5 part by weight to 100 parts of the annealing separator, and carrying out said annealing at a temperature not lower than 1,100°C.
Claim 3
Dependent Claim
82 words
An annealing separator useful for production of a grain-oriented electrical steel sheet which is subjected to annealing at a temperature not lower than 1,100°C, comprising a metal oxide selected from the group consisting of MgO, CaO and Al 2 O 3 and a metal nitride selected from the group consisting of chromium, nitride, titanium nitride, vanadium nitride, and combinations thereof, said metal nitride being present in an amount not less than 0.5 part by weight to 100 parts of the metal oxide.
Claim 4
Dependent Claim
82 words
An annealing separator useful for production of a grain-oriented electrical steel sheet which is subjected to annealing at a temperature not lower than 1,100°C, comprising a metal oxide selected from the group consisting of MgO, CaO and Al 2 O 3 and a metal nitride selected from the group consisting of chromium, nitride, titanium nitride, vanadium nitride, and combinations thereof, said metal nitride being present in an amount not less than 0.5 part by weight to 100 parts of the metal oxide.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |