US4073668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing silicon steel strip
Assignee: Bethlehem Steel Corp
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Filing: 1976-09-15
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Granted: 1978-02-14
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Expires: 1996-09-15
Abstract
Abstract A slurry of ferrosilicon powder is applied to both sides of a low carbon steel strip. The particle size of the ferrosilicon powder is controlled so that, after the slurry coatings are dried, there exists on each side of the steel strip at least a single layer of closely packed particles. The coated strip is then compacted. It is next heated in a protective environment to cause uniform diffusion of silicon throughout the strip.
Inventors
- 👤 George E. Wieland, Jr.
- 👤 Eugene M. Rudzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:34
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1244; C21D8/1255; B; B22; B22F; B22F3/00; B22F3/18; B22F7/00; B22F7/02; B22F7/04; C23; C23C; C23C10/00; C23C10/28; C23C10/30; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F41/00; H01F41/02; H01F41/0206; C21D8/1277
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
150 words
A method of producing silicon sheet steel comprising: a. coating both sides of a low carbon steel substrate with a slurry of a silicon-containing powder, at least 90% of the particles of said powder having a diameter equal to or less than d, and the maximum diameter of the particles being 1.25d, where: ##EQU17## in microns, and where t is the thickness of the substrate in inches, %Si pr is the desired silicon in the final product, %Si p is the amount of silicon in the powder, and ρ p is the density of the powder in g/cm 3 , b. drying said slurry on said substrate to provide a coating, c. compacting said powder particles on said substrate, and d. heating said substrate with the compacted powder thereon in a protective environment for a time and at a temperature sufficient to cause uniform diffusion of silicon throughout said substrate.
Claim 2
Independent Claim
150 words
A method of producing silicon sheet steel comprising: a. coating both sides of a low carbon steel substrate with a slurry of a silicon-containing powder, at least 90% of the particles of said powder having a diameter equal to or less than d, and the maximum diameter of the particles being 1.25d, where: ##EQU17## in microns, and where t is the thickness of the substrate in inches, %Si pr is the desired silicon in the final product, %Si p is the amount of silicon in the powder, and ρ p is the density of the powder in g/cm 3 , b. drying said slurry on said substrate to provide a coating, c. compacting said powder particles on said substrate, and d. heating said substrate with the compacted powder thereon in a protective environment for a time and at a temperature sufficient to cause uniform diffusion of silicon throughout said substrate.
Claim 3
Dependent Claim
39 words
The method as recited in claim 1, in which all of said powder has a diameter equal to or less than d, and the substrate is heated to within the range of 930° to 1040° C during step (d).
References Cited (Backward Citations)
US2109485A
Cited
US3421925A
Cited
US3423253A
Cited
US3700506A
Cited
US3634148A
Cited
US3615917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |