Method for manufacturing grain oriented electrical steel sheet
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United States of America Patent
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Nov 17, 2015
Grant Date -
Apr 11, 2013
app pub date -
Jun 17, 2011
filing date -
Jun 18, 2010
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Abstract
The present invention provides a method for manufacturing a grain oriented electrical steel sheet, including preparing as a material a steel slab having a predetermined composition and carrying out at least two cold rolling operations, characterized in that a thermal treatment is carried out, prior to any one of cold rolling operations other than final cold rolling, at temperature in the range of 500° C. to 750° C. for a period in the range of 10 minutes to 480 hours. The grain oriented electrical steel sheet of the present invention exhibits through utilization of austenite-ferrite transformation superior magnetic properties after secondary recrystallization.
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