The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 2024
Filed:
Dec. 18, 2019
Posco, Pohang-si, KR;
Oh-Yeoul Kwon, Pohang-si, KR;
Woo-Sin Kim, Pohang-si, KR;
Dae-Uk Kim, Pohang-si, KR;
Jong-Tae Park, Pohang-si, KR;
POSCO CO., LTD, Pohang-si, KR;
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 ()=(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.).