US 11,773,490 B2
Method for producing oriented electrical steel sheet with ultra-low iron loss
Sang-Won Lee, Pohang-si (KR); Min-Serk Kwon, Pohang-si (KR); and Jin-Su Bae, Pohang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Appl. No. 16/957,502
Filed by POSCO, Pohang-si (KR)
PCT Filed Dec. 13, 2018, PCT No. PCT/KR2018/015801
§ 371(c)(1), (2) Date Jun. 24, 2020,
PCT Pub. No. WO2019/132333, PCT Pub. Date Jul. 4, 2019.
Claims priority of application No. 10-2017-0179514 (KR), filed on Dec. 26, 2017; and application No. 10-2018-0154473 (KR), filed on Dec. 4, 2018.
Prior Publication US 2021/0062342 A1, Mar. 4, 2021
Int. Cl. C21D 8/12 (2006.01); C21D 9/46 (2006.01); C23C 16/40 (2006.01); C23C 16/453 (2006.01); C23C 16/505 (2006.01); C23C 16/56 (2006.01); C23C 16/452 (2006.01)
CPC C23C 16/505 (2013.01) [C21D 9/46 (2013.01); C23C 16/40 (2013.01); C23C 16/405 (2013.01); C23C 16/452 (2013.01); C23C 16/453 (2013.01); C23C 16/56 (2013.01); C21D 8/1272 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of manufacturing an oriented electrical steel sheet including processes of reheating a steel slab, hot-rolling the steel slab to obtain a steel sheet, hot-rolled sheet annealing, cold-rolling the steel sheet, the method further comprising:
primary recrystallization annealing the steel sheet;
forming a ceramic coating layer by allowing a gas-phase ceramic precursor to contact-react with a portion or an entire portion of one surface or both surfaces of the primary recrystallization annealed steel sheet in a plasma state using an atmospheric pressure plasma CVD process (APP-CVD); and
secondary recrystallization annealing the steel sheet on which the ceramic coating layer is formed.