Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1988-03-25
1990-02-06
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148112, 148122, H01F 104
Patent
active
048986267
ABSTRACT:
Ultra-rapid annealing of grain oriented electrical steel to a temperature prior to the final high temperature anneal results in improved texture and smaller secondary grain size. The ultra-rapid anneal requires heating the strip to a temperature above about 675.degree. C. (1250.degree. F.) at a rate above 100.degree. C. per second (180.degree. F. per second). The ultra-rapid anneal is performed after the first stage of cold rolling and prior to or as part of the decarburization anneal. The material will survive a subsequent stress relief anneal and may be further improved by various domain treatments. The ultra-rapid anneal increases productivity and procedures improved core loss properties.
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Margerum David E.
Shoen Jerry W.
Armco Advanced Materials Corporation
Bunyard R. J.
Fillnow L. A.
Johnson R. H.
Sheehan John P.
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