US3849212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primary recrystallized textured iron alloy member having an open gamma loop
Assignee: ABB Inc USA
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Filing: 1972-12-11
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Granted: 1974-11-19
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Expires: 1992-12-11
Abstract
Abstract An iron base alloy is described which contains low amounts of alloying elements and is suitable for use as a transformer core material. The alloy is characterized by a (110) texture, and a primary recrystallized and normal grain growth microstructure. The process for obtaining the oriented structure is either a two stage or a three stage process in which the final cold reduction effects only a moderate reduction in cross-sectional area to finish gauge. In all cases the alloy is subjected to a final anneal at a temperature below the Ac1 temperature of the alloy.
Inventors
- 👤 D Thornburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:37
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C22; C22C; C22C38/00; C22C38/02; C22C38/10; C22C38/16; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; C21D8/1216; C21D8/1222; C21D8/1227; C21D8/1244; C21D8/1261
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A HEAT TREATED ALLOY MEMBER HAVING AN OPEN GAMMA LOOP AND IMPROVED MAGNETIC CHARACTERISTIC CONSISTING ESSENTIALLY OF UP TO 0.03% CARBON, UP TO 1% MANGANESE, LESS THAN 0.012% SULFUR, FROM ABOUT 0.3% TO ABOUT 4% OF A VOLUME RESITIVITY IMPROVING ELEMENT SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF, UP TO 2% SILICON, UP TO 2% CHROMIUM, AND UP TO 3% COBALT, AND THE BALANCE ESSENTIALLY IRON WITH INCIDENTAL IMPURITIES, THE ALLOY HAVING A MAJOR PORPORTION OF THE GRAINS EXHIBITING A (1109 TEXTURE AND IN WHICH A MAJOR PROPORTION OF THE ORIENTED GRAINS HAVE A CUBE EDGES OF THEIR CRYSTAL LATTICES ALIGNED WITHIN 12* OF THE ROLLING DIRECTION, AND PRIMARY RECRYSTALLIZED AND NORMAL GRAIN GROWTH MICROSTRUCTURE.
Claim 2
Dependent Claim
115 words
A HEAT TREATED ALLOY MEMBER HAVING AN OPEN GAMMA LOOP AND IMPROVED MAGNETIC CHARACTERISTIC CONSISTING ESSENTIALLY OF UP TO 0.03% CARBON, UP TO 1% MANGANESE, LESS THAN 0.012% SULFUR, FROM ABOUT 0.3% TO ABOUT 4% OF A VOLUME RESITIVITY IMPROVING ELEMENT SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF, UP TO 2% SILICON, UP TO 2% CHROMIUM, AND UP TO 3% COBALT, AND THE BALANCE ESSENTIALLY IRON WITH INCIDENTAL IMPURITIES, THE ALLOY HAVING A MAJOR PORPORTION OF THE GRAINS EXHIBITING A (1109 TEXTURE AND IN WHICH A MAJOR PROPORTION OF THE ORIENTED GRAINS HAVE A CUBE EDGES OF THEIR CRYSTAL LATTICES ALIGNED WITHIN 12* OF THE ROLLING DIRECTION, AND PRIMARY RECRYSTALLIZED AND NORMAL GRAIN GROWTH MICROSTRUCTURE.
Claim 3
Dependent Claim
21 words
The alloy member of claim 1 in which the chromium content is within the range between about 0.3 to about 0.9%.
Claim 4
Dependent Claim
20 words
The alloy member of claim 1 in which the silicon content is within the range between about 0.5% and 1.5%.
Claim 5
Dependent Claim
117 words
A heat treated alloy member having an open gamma loop and improved magnetic characteristics consisting essentially of up to 0.03% carbon, up to 0.5% manganese, less than 0.010% sulfur, from 0.3% to 4% of at least one of the volume resistivity improving elements selected from the group consisting essentially of up to 2% silicon, up to 2% chromium, and up to 3% cobalt, the balance being iron with incidental impurities, the alloy having a major proportion of the grains exhibiting a (110) texture and in which a major proportion of the oriented grains have the cube edges of their crystal lattices aligned within 12* of the rolling direction, and a primary recrystallized and normal grain growth microstructure.
Claim 6
Dependent Claim
117 words
A heat treated alloy member having an open gamma loop and improved magnetic characteristics consisting essentially of up to 0.03% carbon, up to 0.5% manganese, less than 0.010% sulfur, from 0.3% to 4% of at least one of the volume resistivity improving elements selected from the group consisting essentially of up to 2% silicon, up to 2% chromium, and up to 3% cobalt, the balance being iron with incidental impurities, the alloy having a major proportion of the grains exhibiting a (110) texture and in which a major proportion of the oriented grains have the cube edges of their crystal lattices aligned within 12* of the rolling direction, and a primary recrystallized and normal grain growth microstructure.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |