	US 12,331,370 B2
	Grain-oriented electrical steel sheet and manufacturing method therefor
Chang-Soo Park, Pohang-si (KR); Kyu-Seok Han, Pohang-si (KR); Jin-Wook Seo, Pohang-si (KR); and Yu-Jun Bak, Pohang-si (KR)
Assigned to POSCO, Pohang-si (KR)
Appl. No. 17/786,267
Filed by POSCO, Pohang-si (KR)
PCT Filed Dec. 15, 2020, PCT No. PCT/KR2020/018330 § 371(c)(1), (2) Date Jun. 16, 2022, PCT Pub. No. WO2021/125738, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0169752 (KR), filed on Dec. 18, 2019.
Prior Publication US 2023/0029310 A1, Jan. 26, 2023
Int. Cl. C21D 8/02 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)

CPC C21D 8/0273 (2013.01) [C21D 1/26 (2013.01); C21D 6/008 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0284 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C21D 2201/05 (2013.01)]

13 Claims

1. A grain-oriented electrical steel sheet comprising, by wt %: 3.0 to 4.5% of Si; 0.05 to 0.2% of Mn; 0.015 to 0.035% of Al; 0.0015% or less (excluding 0%) of C; 0.0015% or less (excluding 0%) of N; 0.0015% or less (excluding 0%) of S; and a balance of Fe and other unavoidable impurities,

wherein the grain-oriented electrical steel sheet satisfies the following Relational Expressions 1 and 2:

(W_13/50/W_17/50)≤0.57 [Relational Expression 1]

(W_15/50/W_17/50)≤0.76 [Relational Expression 2]

where Wx/y represents a core loss value under conditions in which a magnitude of an applied magnetic field is x/10 T and a frequency is y Hz.