Posco

Posco Co., Ltd

Byung Deug Hong

Chang Soo Park

Jong Ho Park

Hyung Don Joo

Min Soo Han

Min Serk Kwon

Taeyoung No

Yun Su Kim

Heon Jo Choi

A method for manufacturing grain-oriented electrical steel sheet includes: manufacturing a steel slab having at least one of 2 wt % to 7 wt % of Si, 0.03 wt % to 0.10 wt % of Sn, and 0.01 wt % to 0.05 wt % of Sb; hot-rolling the steel slab to produce a hot-rolled sheet; cold-rolling the hot-rolled sheet to produce a cold-rolled sheet; primary recrystallization-annealing the cold-rolled sheet; applying an annealing separator to the primary recrystallization-annealed cold-rolled sheet and drying the same; and secondary recrystallization-annealing the cold-rolled sheet on which the annealing separator is applied. The primary recrystallization-annealing is performed so that the thickness of an oxide layer formed on the surface of the cold-rolled sheet is 0.5 &#x3bc;m to 2.5 &#x3bc;m, and the oxygen amount of the oxide layer is 600 ppm or more after the primary recrystallization-annealing, and in which a forsterite (MgSiO) film can be removed in the secondary recrystallization-annealing.

Method for manufacturing grain-oriented electrical steel sheet

An annealing separator for an oriented electrical steel sheet includes: a first component including a Mg oxide or a Mg hydroxide; and a second component including one kind among oxides and hydroxides of a metal selected from Al, Ti, Cu, Cr, Ni, Ca, Zn, Na, K, Mo, In, Sb, Ba, Bi, and Mn, or two or more kinds thereof.

Annealing separator for oriented electrical steel sheet, oriented electrical steel sheet, and manufacturing method of oriented electrical steel sheet

Provided is an oriented electrical steel sheet including: a forsterite film formed on one side or both sides of an oriented electrical steel sheet substrate; and a ceramic layer formed on an entire or partial region of the forsterite film. Provided is a manufacturing method for an oriented electrical steel sheet including: preparing an oriented electrical steel sheet having a forsterite film formed on one surface or both surfaces thereof; and forming a ceramic layer by spraying ceramic powder on the forsterite film.

Grain-oriented electrical steel sheet and method for manufacturing grain-oriented electrical steel sheet

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Pohang-si, South Korea

Byung Deug Hong