Posco Co., Ltd

Posco

Se-Min Park

Seong-Cheol Hong

Ki-Young Min

Won-Gul Lee

Jong-Tae Park

Oh-Yeoul Kwon

Chang-Ho Kim

Dong-geun Kim

Oho-Cheal Kwon

Jung-Moon Kang

Chang Soo Park

Min Serk Kwon

Hyun-Chul Park

Jin-Wook Seo

Heon-Jo Choi

Hyun-Seok Ko

Ju Seung Lee

Sang-Uk Ha

Hongwook Jung

Jae Soo Kim

According to an exemplary embodiment of the present invention, a method for manufacturing a grain-oriented electrical steel sheet includes: a step of hot-rolling a slab to manufacture a hot-rolled steel sheet; a step of performing hot-rolled sheet annealing on the hot-rolled steel sheet; a step of performing primary cold-rolling on the hot-rolled sheet annealed hot-rolled steel sheet; a step of performing primary decarburization annealing on the primarily cold-rolled steel sheet; a step of performing secondary cold-rolling on the decarburization-annealed steel sheet; a step of performing secondary decarburization annealing on the secondarily cold-rolled steel sheet; and a step of performing continuous annealing on the secondarily decarburization-annealed steel sheet.

Grain-oriented electrical steel sheet and method for manufacturing same

A grain-oriented electrical steel sheet includes a plurality of linear deformable portions formed on a surface of the electrical steel sheet in a rolling direction, wherein an interval between the deformable portions changes to correspond to a grain size of grains over the entire length of the steel sheet, and at least two regions in which intervals between the deformable portions are different exist.

Grain-oriented electrical steel sheet and manufacturing method therefor

An alien substance removing apparatus according to one embodiment of the present invention may comprise: a hood unit provided adjacent to an electrical steel sheet and for collecting an alien substance generated in the electrical steel sheet by laser irradiation; and a scraping unit coupled to the hood unit and scraping and removing the alien substance attached to one surface of the hood unit facing the electrical steel sheet.

Alien substance removing apparatus and electrical steel sheet manufacturing facility having thereof

A foreign substance collecting apparatus according to one embodiment of the present disclosure may comprise: a collection body unit formed with a suction port through which air including foreign substances flows in and a discharge port through which air removed of the foreign substances is discharged; and a mixing unit provided inside the collection body unit and disposed on a flow passage of the air, and forming a vortex in washing water contained therein by inducing a rotary flow of the air.

Foreign substance collecting apparatus and electrical steel sheet manufacturing facility including same

A grain-orientation electrical steel sheet according to an exemplary embodiment of the present invention includes a linear groove formed in a direction intersecting with the rolling direction, the groove includes the gradient section and the uniform section on a cross section including the transverse direction of the groove and the rolling surface normal direction of the steel sheet, and a length of the gradient section (GS) and the length of the uniform section (US) satisfy Equation 1 below.0.1≤[GSL]/[USL]≤0.5  [Equation 1]

Grain-oriented electrical steel sheet and magnetic domain refinement method thereof

The present invention provides an annealing separator composition, 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 present invention comprising: on the basis of total solid 100 wt %, 5 to 70 wt % of mullite; and the remainder being magnesium oxide or magnesium hydroxide.

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

A grain-oriented electrical steel sheet incudes a groove formed on a surface and a solidified alloy layer formed under the groove, wherein the solidified alloy layer includes particles of a certain average diameter.

Grain-oriented electrical steel sheet and magnetic domain refinement method therefor

A grain-oriented electrical steel sheet according to an embodiment of the present invention includes: a groove on a line formed on one surface of an electrical steel sheet in a direction crossing a rolling direction; and a thermal shock portion on a line formed on one surface of the electrical steel sheet in the direction crossing the rolling direction, wherein a distance between the groove and the thermal shock portion is 1 mm or less.

Grain-oriented electrical steel sheet and magnetic domain refining method therefor

A grain-oriented electrical steel sheet includes a groove formed on a surface and a solidified alloy layer formed under the groove, wherein the solidified alloy layer includes particles of a certain average diameter.

A method for refining magnetic domains of a grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes: a step of preparing a grain-oriented electrical steel sheet; and a step of forming a groove by irradiating a quasi-continuous laser beam of which a duty is from 98.0 to 99.9% on a surface of the grain-oriented electrical steel sheet.

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Pohang-si, South Korea

Se-Min Park