Patent US3180767A successfully refreshed from Google Patents.
US3180767A
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Process for making a decarburized low carbon, low alloy ferrous material for magnetic uses
Assignee: Armco Inc
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Filing: 1962-10-08
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Granted: 1965-04-27
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Expires: 1982-10-08
Abstract
No abstract record available.
Inventors
- 👤 Robert W Easton
- 👤 Victor W Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:09
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1222; C21D8/1244; C21D8/1261; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; C21D8/1255
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A PROCESS FOR MAKING A FERROUS MAGNETIC MATERIAL WHICH COMPRISES FORMING A STEEL CONTAINING ABOUT 0.05% TO 0.1% CARBON, ABOUT 0.15% TO 1% MANGANESE, UP TO ABOUT 0.15% PHOSPHORUS, AND UP TO ABOUT 0.1% SILICON, THE BALANCE BEING SUBSTANTIALLY ALL IRON WITH NORMAL RESIDUAL IMPURITIES, AND (1) CASTING THE STEEL INTO A SHAPE SUITABLE FOR HOT ROLLING, (2) HOT ROLLING THE STEEL TO AN INTERMEDIATE GUAGE AND COILING THE HOT MATERIAL AS ROLLED AT A TEMPERATURE NOT ABOVE ABOUT 1150*F. TO PRODUCE FINELY DIVIDED DISPERSED CARBIDS THEREIN, AND PICKING THE HOT ROLLED MATERIAL, (3) SUBJECTING THE HOT ROLLED AND PICKLED MATERIAL TO A DECARBURIZING ANNEAL AT A TEMPERATURE OF SUBSTANTIALLY 1250* TO 1600*F. SO AS TO REDUCE THE CARBON THEREIN TO A VALUE NOT GREATER THAN AOBUT 0.0005% AND TO CAUSE COLUMNAR GRAIN GROWTH TO OCUR BECAUSE OF A PHASE CHANGE, AND (4) COLD ROLLING THE DECARBURIZED MATERIAL WITH A REDUCTION OF SUBSTANTIALLY 40% TO 80%
Claim 2
Dependent Claim
156 words
A PROCESS FOR MAKING A FERROUS MAGNETIC MATERIAL WHICH COMPRISES FORMING A STEEL CONTAINING ABOUT 0.05% TO 0.1% CARBON, ABOUT 0.15% TO 1% MANGANESE, UP TO ABOUT 0.15% PHOSPHORUS, AND UP TO ABOUT 0.1% SILICON, THE BALANCE BEING SUBSTANTIALLY ALL IRON WITH NORMAL RESIDUAL IMPURITIES, AND (1) CASTING THE STEEL INTO A SHAPE SUITABLE FOR HOT ROLLING, (2) HOT ROLLING THE STEEL TO AN INTERMEDIATE GUAGE AND COILING THE HOT MATERIAL AS ROLLED AT A TEMPERATURE NOT ABOVE ABOUT 1150*F. TO PRODUCE FINELY DIVIDED DISPERSED CARBIDS THEREIN, AND PICKING THE HOT ROLLED MATERIAL, (3) SUBJECTING THE HOT ROLLED AND PICKLED MATERIAL TO A DECARBURIZING ANNEAL AT A TEMPERATURE OF SUBSTANTIALLY 1250* TO 1600*F. SO AS TO REDUCE THE CARBON THEREIN TO A VALUE NOT GREATER THAN AOBUT 0.0005% AND TO CAUSE COLUMNAR GRAIN GROWTH TO OCUR BECAUSE OF A PHASE CHANGE, AND (4) COLD ROLLING THE DECARBURIZED MATERIAL WITH A REDUCTION OF SUBSTANTIALLY 40% TO 80%
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) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |