01-07-2015 дата публикации
Номер: KR1020150073795A
Принадлежит:
The present invention relates to a grain-oriented electrical steel sheet, and a manufacturing method thereof. The method to manufacture a grain-oriented electrical steel sheet comprises: a step of providing a slab composed of 2.0-4.5 wt% of Si, 0.005-0.040 wt% of acid soluble Al, 0.20 wt% or less of Mn (excluding 0 wt%), 0.01 wt% or less of N (excluding 0 wt%), 0.01 wt% or less of S (excluding 0 wt%), 0.005-0.05 wt% of P, 0.03-0.08 wt% of C, 0.02-0.08 wt% of Sn, 0.01-0.1 wt% of Mo, and the remainder consisting of Fe and other inevitable impurities; a step of reheating the slab; a step of cold-rolling the slab after hot-rolling the slab; a step of annealing the cold-rolled steel sheet for decarburization and nitriding; and a step of finally annealing the steel sheet by spreading an annealing separator. According to the present invention, a silicon content in the steel sheet is increased and the steel sheet is heated at relatively high temperatures by optimally controlling the component system ...
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