US4244757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing for cube-on-edge oriented silicon steel
Assignee: Allegheny Ludlum Corp
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Filing: 1979-05-21
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Granted: 1981-01-13
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Expires: 1999-05-21
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 0.015 to 0.15% manganese, from 0.0006 to 0.0080% boron, up to 0.0045% nitrogen, from 0.005 to 0.019% sulfur, no more than 0.0065% phosphorus and from 2.5 to 4.0% silicon; casting the steel; hot rolling the steel; welding the steel to another steel member of like chemistry; cold rolling the steel to a thickness no greater than 0.020 inch; decarburizing the steel; applying a refractory oxide coating to the steel; and final texture annealing the steel.
Inventors
- 👤 Frank A. Malagari, Jr.
- 👤 Richard P. Schrecongost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:53
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C22; C22C; C22C38/00; C22C38/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
A process for producing electromagnetic silicon steel having a cube-on-edge orientation, which comprises the steps of: preparing a melt of silicon steel containing, by weight, from 0.02 to 0.06% carbon, from 0.015 to 0.15% manganese, from 0.0006 to 0.0080% boron, up to 0.0045% nitrogen, from 0.005 to 0.019% sulfur, no more than 0.0065% phosphorus and from 2.5 to 4.0% silicon; casting said steel; hot rolling said steel; welding said steel to another steel member of like chemistry; cold rolling said steel to a thickness no greater than 0.020 inch; decarburizing said steel; applying a refractory oxide coating to said steel; and final texture annealing said steel; said steel having a permeability of at least 1870(G/O e ) at 10 oersteds and a core loss of no more than 0.700 watts per pound at 17 kilogauss--60 Hz.
Claim 2
Dependent Claim
136 words
A process for producing electromagnetic silicon steel having a cube-on-edge orientation, which comprises the steps of: preparing a melt of silicon steel containing, by weight, from 0.02 to 0.06% carbon, from 0.015 to 0.15% manganese, from 0.0006 to 0.0080% boron, up to 0.0045% nitrogen, from 0.005 to 0.019% sulfur, no more than 0.0065% phosphorus and from 2.5 to 4.0% silicon; casting said steel; hot rolling said steel; welding said steel to another steel member of like chemistry; cold rolling said steel to a thickness no greater than 0.020 inch; decarburizing said steel; applying a refractory oxide coating to said steel; and final texture annealing said steel; said steel having a permeability of at least 1870(G/O e ) at 10 oersteds and a core loss of no more than 0.700 watts per pound at 17 kilogauss--60 Hz.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein said melt has at least 0.0008% boron.
Claim 4
Dependent Claim
17 words
A process according to claim 2, wherein the nitrogen content of said melt does not exceed 0.0040%.
Claim 5
Dependent Claim
15 words
A process according to claim 2, wherein said melt has no more than 0.0060% phosphorus.
Claim 6
Dependent Claim
17 words
A process according to claim 4, wherein the nitrogen content of said melt does not exceed 0.0040%.
Claim 7
Dependent Claim
21 words
A process according to claim 2, wherein a hot rolled band of said steel is welded to another hot rolled band.
Claim 8
Dependent Claim
58 words
A process according to claim 1, wherein said melt consists essentially of, by weight, 0.02 to 0.06% carbon, 0.015 to 0.15% manganese, 0.0006 to 0.0080% boron, up to 0.0045% nitrogen, 0.005 to 0.0019% sulfur, no more than 0.0065% phosphorus, 2.5 to 4.0% silicon, up to 1.0% copper, up to 0.1% tin, no more than 0.009% aluminum, balance iron.
Claim 9
Dependent Claim
14 words
A process according to claim 7, wherein said melt has at least 0.0008% boron.
Claim 10
Dependent Claim
27 words
A process according to claim 8, wherein the nitrogen content of said melt does not exceed 0.0040% and wherein said melt has no more than 0.0060% phosphorus.
Claim 11
Dependent Claim
14 words
A cube-on-edge oriented silicon steel made in accordance with the process of claim 2.
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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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |