Title:
ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/130646
Kind Code:
A1
Abstract:
A method for producing an oriented electrical steel sheet according to one embodiment of the present invention includes: a step for producing a cold rolled sheet; a step for forming a groove by emitting a laser onto the cold rolled sheet; and a step for removing a portion of an oxide layer formed on the surface of the cold rolled sheet, and thereby keeping the thickness of the oxide layer between 1-5 nm, wherein the oriented electrical steel sheet has no more than 0.25/µm2 of islands exhibiting a sphericity of 0.5-0.9 below the oxide layer in a lower part of the groove.
Inventors:
KWON OH-YEOUL (KR)
KIM WOO-SIN (KR)
PARK JONG-TAE (KR)
KIM WOO-SIN (KR)
PARK JONG-TAE (KR)
Application Number:
PCT/KR2019/018034
Publication Date:
June 25, 2020
Filing Date:
December 18, 2019
Export Citation:
Assignee:
POSCO (KR)
International Classes:
H01F1/16; H01F41/02
Foreign References:
| KR20160078247A | 2016-07-04 | |||
| KR20180073306A | 2018-07-02 | |||
| KR20150012205A | 2015-02-03 | |||
| KR101719231B1 | 2017-04-04 | |||
| KR20170107085A | 2017-09-22 |
Other References:
See also references of EP 3901969A4
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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