Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1989-12-11
1992-03-17
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, H01F 104
Patent
active
050965107
ABSTRACT:
The thermal flattening of grain oriented silicon steel which is in the semi-processed condition has improved magnetic properties after a stress relief anneal by using a low temperature and high tension flattening anneal. The flattening process is conducted at a temperature between 1000.degree. to 1435.degree. F. (540.degree. to 780.degree. C.) with a tension selected to produce a yield strength/tension ratio from above 5 to about 20 and preferably from 7 to 13. The yield strength of the material will vary depending on the length of the time at peak temperature but are typically from 400 to 4000 psi (29,200 to 292,000 gm/cm.sup.2). The material as thermally flattened will have at least about 10% stress. After a stress relief anneal above about 1450.degree. F. (785.degree. C.), the material has significantly improved core loss compared to conventional thermally flattened material. The material is particularly suited for wound transformer core applications.
REFERENCES:
patent: 2104169 (1938-06-01), Schorschu
patent: 2282163 (1942-11-01), Burgwin
patent: 2351922 (1944-06-01), Burgwin
patent: 2412041 (1946-09-01), Gifford et al.
patent: 2980561 (1961-04-01), Ford et al.
patent: 3130088 (1964-05-01), Cook
patent: 3161225 (1964-04-01), Ward et al.
patent: 3421925 (1969-01-01), Hair et al.
Loudermilk Dannie S.
Schoen Jerry W.
Armco Inc.
Bunyard Robert J.
Fillnow Larry A.
Johnson Robert H.
Sheehan John P.
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