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:
May. 05, 2026
Filed:
Dec. 18, 2019
Applicant:
Posco, Pohang-si, KR;
Inventors:
Assignee:
POSCO CO., LTD, Pohang-si, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01F 1/18 (2006.01); B23K 26/364 (2014.01); C21D 8/0247 (2026.01); C21D 8/12 (2026.01); C21D 8/1216 (2026.01); C21D 8/1244 (2026.01); C21D 8/1277 (2026.01); C21D 10/00 (2006.01); H01F 27/245 (2006.01); H01F 41/02 (2006.01);
U.S. Cl.
CPC ...
H01F 1/18 (2013.01); B23K 26/364 (2015.10); C21D 8/0273 (2013.01); C21D 8/1233 (2013.01); C21D 8/1272 (2013.01); C21D 8/1283 (2013.01); C21D 10/005 (2013.01); C21D 2201/05 (2013.01); H01F 27/2455 (2013.01); H01F 41/024 (2013.01);
Abstract
A manufacturing method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes producing a cold-rolled plate; forming a groove in the cold-rolled plate; performing primary recrystallization annealing to the cold-rolled plate; and applying an annealing separator to the primary-recrystallized cold-rolled plate and performing secondary recrystallization annealing, wherein a weight ratio of SiO/FeSiOof the surface layer part of the cold-rolled plate is 0.3 to 3 after the primary recrystallization annealing of the cold-rolled plate. (Here, x is an integer from 1 to 2, and y is an integer from 2 to 4.)