Grain-oriented electrical steel sheet and manufacturing method therefor

Abstract

A manufacturing method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes: manufacturing a cold-rolled sheet; forming a groove in the cold-rolled sheet; removing an Fe—O oxide formed on a surface of the cold-rolled sheet; primary recrystallization annealing the cold-rolled sheet; and applying an annealing separating agent to the primary recrystallized cold-rolled sheet, and secondary recrystallization annealing it, wherein a close contacting property coefficient calculated by Formula 1 below is 0.016 to 1.13. close contacting property coefficient (Sad)=(0.8×R)/Hhill-up  [Formula 1] (In Formula 1, R represents the average roughness (μm) of the surface of the cold-rolled sheet after the removing of the oxide, and Hhill-up represents the average height (μm) of the hill-up present on the surface of the cold-rolled sheet after the removing of the oxide.).

Dependencies are inferred from the claim text.