US4000015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing for cube-on-edge oriented silicon steel using hydrogen of controlled dew point
Assignee: Allegheny Ludlum Corp
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Filing: 1975-05-15
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Granted: 1976-12-28
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Expires: 1995-05-15
Abstract
Abstract A process for producing electromagnetic silicon steel having a cube-on-edge orientation. The process includes the steps of: preparing a melt of silicon steel containing from 0.02 to 0.06% carbon, from 0.0006 to 0.0080% boron, up to 0.0100% nitrogen and from 2.5 to 4.0% silicon; casting said steel; hot rolling said steel; cold rolling said steel; decarburizing said steel to a carbon level below 0.02% in a hydrogen-bearing atmosphere havng a dew point of from +20° F to +60° F; and final texture annealing said steel.
Inventors
- 👤 Frank A. Malagari, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:23
CPC Classifications
C; C21; C21D; C21D3/00; C21D3/02; C21D3/04; C21D8/00; C21D8/12; C21D8/1244; C21D8/1255; C22; C22C; C22C38/00; C22C38/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
In a process for producing boron-bearing, electromagnetic silicon steel having a cube-on-edge orientation, which process includes the steps of: preparing a melt of silicon steel containing from 0.02 to 0.06% carbon, from 0.0006 to 0.0080% boron, up to 0.0100% nitrogen and from 2.5 to 4.0% silicon; casting said steel; hot rolling said steel; cold rolling said steel; decarburizing said steel; and final texture annealing said steel; the improvement comprising the step of decarburizing said steel to a carbon level below 0.02% in a hydrogen bearing atmosphere having a controlled dew point of from +20° F to +60° F, said controlled dew point selected to yield a decrease in said steel's core loss.
Claim 2
Dependent Claim
112 words
In a process for producing boron-bearing, electromagnetic silicon steel having a cube-on-edge orientation, which process includes the steps of: preparing a melt of silicon steel containing from 0.02 to 0.06% carbon, from 0.0006 to 0.0080% boron, up to 0.0100% nitrogen and from 2.5 to 4.0% silicon; casting said steel; hot rolling said steel; cold rolling said steel; decarburizing said steel; and final texture annealing said steel; the improvement comprising the step of decarburizing said steel to a carbon level below 0.02% in a hydrogen bearing atmosphere having a controlled dew point of from +20° F to +60° F, said controlled dew point selected to yield a decrease in said steel's core loss.
Claim 3
Dependent Claim
26 words
An improvement according to claim 1, wherein said steel is decarburized in a hydrogen-bearing atmosphere having a dew point of from +30° F to +45° F.
Claim 4
Dependent Claim
14 words
An improvement according to claim 1, wherein said hydrogen-bearing atmosphere consists essentially of hydrogen.
Claim 5
Dependent Claim
48 words
An improvement according to claim 1, wherein said melt consists essentially of, by weight, 0.02 to 0.06% carbon, 0.015 to 0.11% manganese, 0.015 to 0.05% sulfur, 0.0006 to 0.0080% boron, up to 0.0100% nitrogen, 2.5 to 4.0% silicon, up to 0.5% copper, up to 0.008% aluminum, balance iron.
Claim 6
Dependent Claim
16 words
An improvement according to claim 1, wherein said hydrogen-bearing atmosphere consists essentially of hydrogen and nitrogen.
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |