US 12,404,572 B2
Oriented electrical steel sheet and method for preparing same
Jae Kyoum Kim, Pohang-si (KR); Kyu-Seok Han, Pohang-si (KR); Chang Soo Park, Pohang-si (KR); Jin-Wook Seo, Pohang-si (KR); and Yujun Park, Pohang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Filed by POSCO CO., LTD, Pohang-si (KR)
Filed on Mar. 30, 2023, as Appl. No. 18/128,650.
Application 18/128,650 is a division of application No. 16/957,943, abandoned, previously published as PCT/KR2018/005676, filed on May 17, 2018.
Claims priority of application No. 10-2017-0179927 (KR), filed on Dec. 26, 2017.
Prior Publication US 2023/0235434 A1, Jul. 27, 2023
Int. Cl. C22C 38/16 (2006.01); C21D 8/02 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)
CPC C22C 38/16 (2013.01) [C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 9/0081 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01)] 4 Claims
 
1. A preparing method of an oriented electrical steel sheet, comprising:
preparing a slab including, in a unit of wt %, Si at 1.0 wt % to 5.0 wt %, C at 0.001 wt % to 0.10 wt %, Mn at 0.001 wt % to 0.1 wt %, Cu at 0.001 wt % to 0.1 wt %, S at 0.001 wt % to 0.020 wt %, Se at 0.001 wt % to 0.050 wt %, Al at 0.0005 wt % to 0.010 wt %, N at 0.0005 wt % to 0.005 wt %, and the remainder of Fe and inevitable impurities, and satisfying Equation 1;
heating the slab;
hot rolling the slab to prepare a hot rolled sheet;
cold rolling the hot rolled sheet to prepare a cold rolled sheet;
primary recrystallization annealing the cold rolled sheet; and
secondary recrystallization annealing the cold rolled sheet in which the primary recrystallization annealing is completed:
16≤(10×[Mn]+[Cu])/([S]+[Se])+(0.02−[Al])/[N]≤20  [Equation 1]
wherein in Equation 1, [Mn], [Cu], [S], [Se], [Al], and [N] represent contents (wt %) of Mn, Cu, S, Se, Al, and N, respectively.