US3969162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing silicon steel strip
Assignee: Allegheny Ludlum Corp
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Filing: 1974-08-01
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Granted: 1976-07-13
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Expires: 1994-08-01
Abstract
Abstract A method of producing silicon steel strip from slabs is provided which includes the steps of reducing the slabs in a planetary mill to a thickness of 0.060 to 0.10 inch at a temperature above that at which MnS will precipitate, cooling to between 300°F to 1500°F and reducing the strip at that temperature to a thickness of 0.020 to 0.030.
Inventors
- 👤 Robert H. Henke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:03
CPC Classifications
B; B21; B21B; B21B13/00; B21B13/18; B21B13/20; B21B3/00; B21B3/02; C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1222; C21D8/1227
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
The method of producing oriented silicon steel strip of improved physical properties having a silicon content in the range 2.5 to 4.0 percent comprising the steps of: a. bringing hot rolled strip having a thickness in the range 0.060 to 0.150 inch following normalizing to a temperature below 1500°F. and above 600°F., b. reducing the strip in thickness to final finish thickness prior to recrystallize normalizing to about 0.020 to 0.030 inch while in said temperature range 600°F. to 1500°F., c. normalizing at about 1725°F. to recrystallize grain strength, and d. cold rolling to a selected thickness without further heating.
Claim 2
Independent Claim
100 words
The method of producing oriented silicon steel strip of improved physical properties having a silicon content in the range 2.5 to 4.0 percent comprising the steps of: a. bringing hot rolled strip having a thickness in the range 0.060 to 0.150 inch following normalizing to a temperature below 1500°F. and above 600°F., b. reducing the strip in thickness to final finish thickness prior to recrystallize normalizing to about 0.020 to 0.030 inch while in said temperature range 600°F. to 1500°F., c. normalizing at about 1725°F. to recrystallize grain strength, and d. cold rolling to a selected thickness without further heating.
Claim 3
Dependent Claim
28 words
The method of producing silicon steel strip as claimed in claim 1 wherein the strip is reduced to about 0.026 inch while in the range 600°F. to 1500°F.
Claim 4
Dependent Claim
58 words
The method of producing silicon steel strip as claimed in claim 1 wherein hot rolled strip from a hot rolling mill is cooled to a temperature range below 1500° and above 600°F. and while in said temperature range and without intermediate cooling and heating reduced in thickness by rolling to a thickness of about 0.020 to 0.030 inch.
References Cited (Backward Citations)
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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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |