Posco

Posco Co., Ltd

Min Soo Han

Chang Soo Park

Jong-Tae Park

Hyung Don Joo

Soon-Bok Park

Yunsu Kim

Hyung Ki Park

Jong Ho Park

Yun Su Kim

Min Serk Kwon

Jin-Wook Seo

Sang Woo Lee

Chan-Hee Han

Byung Deug Hong

Ho-Kyung Shim

Dae-Uk Kim

Chang-Soo Kim

Bungkwan Shon

Jae-Keun Shin

An oriented electrical steel sheet according to an embodiment of the present invention includes: a base texture; an AI permeation layer positioned on the base texture; and a film positioned on the AI permeation layer, wherein the AI permeation layer includes AI at 0.5 to 5 wt %, and the film includes an Al—Mg composite.

Annealing separator composition for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for manufacturing grain-oriented electrical steel sheet

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 composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention includes: 100 parts by weight of at least one of a magnesium oxide and a magnesium hydroxide; and 30 to 250 parts by weight of a metal hydroxide including at least one of a nickel hydroxide and a cobalt hydroxide, wherein an average particle diameter of the metal hydroxide is 0.01 to 80 &#x3bc;m.

The present invention relates to a composition for forming an insulation coating film of an oriented electrical steel sheet, including a first component (A) including a composite metal phosphate, a derivative thereof, or a mixture thereof, and a second component (B) including at least two colloidal silicas having different average particle diameters, a method for forming an insulation coating film using the same, and an oriented electrical steel sheet having an insulation coating film formed thereon.

Composition for forming insulation film of oriented electrical steel sheet, method for forming insulation film by using same, and oriented electrical steel sheet having insulation film formed therein

A grain-oriented electrical steel sheet according to an embodiment of the present includes Si at 1.0 wt % to 7.0 wt %, C at 0.005 wt % or less (excluding 0 wt %), In at 0.001 wt % to 0.5 wt %, and the remainder including Fe and other impurities unavoidably added thereto.

Grain-oriented electrical steel sheet and manufacturing method therefor

The present invention has been made in an effort to provide an annealing separator component for an oriented electrical steel sheet, an oriented electrical steel sheet, and a manufacturing method thereof. According to an exemplary embodiment of the present invention, an annealing separator composition for an oriented electrical steel sheet, includes: 100 weight parts of at least one of magnesium oxide and magnesium hydroxide; and 5 to 200 weight parts of aluminum hydroxide.

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

The present invention provides an annealing separator composition for a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet and a method for manufacturing a grain-oriented electrical steel sheet. An annealing separator composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: 100 parts by weight of at least one of magnesium oxide and magnesium hydroxide; 5 to 200 parts by weight of aluminum hydroxide; and 0.1 to 20 parts by weight of a boron compound.

A manufacturing method of an oriented electrical steel sheet according to an exemplary embodiment of the present invention includes: a step of manufacturing a steel slab including one kind or more among Si at 2 to 7%, Sn at 0.03 to 0.10%, and Sb at 0.01 to 0.05% as wt %; a step of hot-rolling the steel slab to manufacture a hot rolled sheet; a step of cold-rolling the hot rolled sheet to manufacture a cold rolled sheet; a step of decarburizing and nitriding the cold rolled sheet for primary recrystallization annealing; a step of coating and drying an annealing separating agent on the primary recrystallization-annealed cold rolled sheet; and a step of secondary recrystallization-annealing the cold rolled sheet coated with the annealing separating agent.

A pre-coating agent composition for a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet including the same, and a manufacturing method thereof are provided. Particularly, a pre-coating agent composition for a grain-oriented electrical steel sheet including an acid containing boron (B); and a solvent, a grain-oriented electrical steel sheet including the same, and a manufacturing method thereof are provided.

Pre-coating agent composition for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet comprising same, 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

An oriented electrical steel sheet and a method of manufacturing the same are provided, and in a method of manufacturing an oriented electrical steel sheet including processes of producing a hot rolled plate by hot rolling a steel slab, performing or omitting hot rolled plate annealing, performing cold rolling, performing decarburization and nitride annealing, and performing final high temperature annealing, the decarburization and nitride annealing process is performed in a dew point range of 35-55&#xb0; C., and in the final annealing process, a glassless additive including MgO is applied.

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Pohang-si, South Korea

Min Soo Han