GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
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May 31, 2016
filing date -
Jun 29, 2010
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Abstract
A method of manufacturing a grain oriented electrical steel sheet includes a rolling a slab for a grain oriented electrical steel sheet to obtain a steel sheet having final sheet thickness; subjecting the steel sheet to decarburizing annealing; coating a surface of the steel sheet with annealing separator mainly composed of MgO; subjecting the steel sheet thus coated to final annealing; providing a tension coating to the steel sheet; and subjecting the steel sheet to magnetic domain refinement by laser irradiation after either the final annealing or provision of the tension coating, wherein (1) the coating weight of the anneal separator is at least 10.0 g/m2; (2) coiling tension at which the steel sheet is coiled after being coated with the annealing separator is 30 N/mm2 to 150 N/mm2; and (3) the average cooling rate in cooling process of the final annealing down to 700° C. is 50° C./hour or less.
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