Title:
GRAIN ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD OF SAME
Document Type and Number:
WIPO Patent Application WO/2023/121273
Kind Code:
A1
Abstract:
A manufacturing method of a grain oriented electrical steel sheet according to one embodiment of the present invention comprises: a step of manufacturing a hot-rolled steel sheet by hot-rolling a slab; a step of hot-rolled sheet annealing the hot-rolled steel sheet; a step of primarily cold-rolling the hot-rolled sheet annealed hot-rolled steel sheet; a step of primarily decarburization annealing the primarily cold-rolled steel sheet; a step of secondarily cold-rolling the decarburization annealed steel sheet; a step of secondarily decarburization annealing the secondarily cold-rolled steel sheet; a primary non-oxidative annealing step of annealing the secondarily decarburization annealed steel sheet at a temperature of 1000℃ to 1200℃ and a dew point temperature of -20℃ or lower; a step of tertiarily cold-rolling the primarily non-oxidative annealed steel sheet; and a secondary non-oxidative annealing step of annealing the tertiarily cold-rolled steel sheet at a soaking temperature of 800℃ to 1000℃ for 30 seconds to five minutes.
Inventors:
KO HYUN-SEOK (KR)
SEO JIN-WOOK (KR)
HAN MINSOO (KR)
SEO JIN-WOOK (KR)
HAN MINSOO (KR)
Application Number:
PCT/KR2022/020912
Publication Date:
June 29, 2023
Filing Date:
December 21, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C21D8/12; C22C38/02; C22C38/04; H01F1/147
Foreign References:
| KR20210079753A | 2021-06-30 | |||
| KR20160074350A | 2016-06-28 | |||
| JP2019123892A | 2019-07-25 | |||
| JP2020063473A | 2020-04-23 | |||
| JP2001316775A | 2001-11-16 |
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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