US3873380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making copper-containing oriented silicon steel
Assignee: Allegheny Ludlum Corp
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Filing: 1973-10-01
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Granted: 1975-03-25
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Expires: 1993-10-01
Abstract
Abstract A grain-oriented silicon steel made by constituting a silicon steel to contain from about 2.2-4.0% silicon and from about 0.240.75% copper, hot rolling it to a thickness of about 0.075-0.1 inches, cold rolling in one cold reduction to a thickness of 0.025 inches or less and then texture annealing for a time sufficient for secondary recrystallization and grain growth to be effected is disclosed.
Inventors
- 👤 Jr Frank A Malagari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1233; C22; C22C; C22C38/00; C22C38/02; C21D8/1244; C21D8/1272
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A PROCESS FOR PRODUCING GRAIN-ORIENTED SILICON STEEL WHICH COMPRISES: A. HOT ROLLING A SILICON STEEL CONSISTING ESSENTIALLY OF FROM ABOUT 2.20-4.0% SILICON AND FROM ABOUT 0.24-0.75% COPPER TO A THICKNESS OF FROM ABOUT 0.075-0.10 INCHES, B. CODL ROLLING THE HOT ROLLED STEEL IN ONE COLD REDUCTION TO 0.025 INCH THICKNESS OR LESS, AND C. TEXTURE ANNEALING THE COLD ROLLED STEEL AT A TEMPERATURE OF FROM ABOUT 2,000*-2,300*F AND FOR ATIME SUFFICIENT FOR SECONDARY RECRYSTALLIZATION AND GRAIN GROWTH TO BE EFFECTED.
Claim 2
Dependent Claim
80 words
A PROCESS FOR PRODUCING GRAIN-ORIENTED SILICON STEEL WHICH COMPRISES: A. HOT ROLLING A SILICON STEEL CONSISTING ESSENTIALLY OF FROM ABOUT 2.20-4.0% SILICON AND FROM ABOUT 0.24-0.75% COPPER TO A THICKNESS OF FROM ABOUT 0.075-0.10 INCHES, B. CODL ROLLING THE HOT ROLLED STEEL IN ONE COLD REDUCTION TO 0.025 INCH THICKNESS OR LESS, AND C. TEXTURE ANNEALING THE COLD ROLLED STEEL AT A TEMPERATURE OF FROM ABOUT 2,000*-2,300*F AND FOR ATIME SUFFICIENT FOR SECONDARY RECRYSTALLIZATION AND GRAIN GROWTH TO BE EFFECTED.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the steel contains about 0.3 to 0.5% copper.
Claim 4
Dependent Claim
16 words
The process of claim 1 in which the steel contains between about 2.5 and 3.0% silicon.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein texture annealing is effected at 2,150*F.
Claim 6
Dependent Claim
42 words
The process of claim 1 wherein said texture annealing is effected for a time sufficient to produce a product having a permeability of at least 1,550 Mu at 10 H and a core loss of at most 1.40 WPP at 15 KB.
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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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |