Posco

Posco Co., Ltd

Dae-Uk Kim

Chang Soo Park

Jong-Tae Park

Min Soo Han

Oh-Yeoul Kwon

Woo-Sin Kim

Soon-Bok Park

Ho-Kyung Shim

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 ()=(0.8×)/  [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 Hrepresents the average height (μm) of the hill-up present on the surface of the cold-rolled sheet after the removing of the oxide.).

Grain-oriented electrical steel sheet and manufacturing method therefor

A coating agent for an electrical steel sheet and a manufacturing method therefor are disclosed. A coating agent for an electrical steel sheet according to an example embodiment of the present invention includes a metal phosphate derivative solution, colloid silica, chromium oxide, and solid silica, and a solvent, wherein the metal phosphate derivative is a single material of a magnesium phosphate derivative or a mixed material of an aluminum phosphate derivative and a magnesium phosphate derivative, and in the mixed material, an amount of aluminum phosphate derivative is 10 wt % or less (not including 0%).

Coating agent for electrical steel sheet, manufacturing method therefor and electrical steel sheet coating method using same

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Pohang-si, South Korea

Dae-Uk Kim