US 12,451,277 B2
Non-oriented electrical steel sheet and method for manufacturing same
Hyung Don Joo, Pohang-si (KR); Il-Nam Yang, Pohang-si (KR); Junesoo Park, Pohang-si (KR); and Chang Soo Park, Pohang-si (KR)
Assigned to POSCO, Pohang-si (KR)
Appl. No. 17/786,508
Filed by POSCO, Pohang-si (KR)
PCT Filed Dec. 17, 2020, PCT No. PCT/KR2020/018609
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2021/125855, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0172471 (KR), filed on Dec. 20, 2019.
Prior Publication US 2023/0025678 A1, Jan. 26, 2023
Int. Cl. H01F 1/147 (2006.01); C21D 1/06 (2006.01); C21D 6/00 (2006.01); C21D 8/12 (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); C23C 8/26 (2006.01); C23C 8/80 (2006.01); H01F 41/02 (2006.01)
CPC H01F 1/14775 (2013.01) [C21D 1/06 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1255 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C23C 8/26 (2013.01); C23C 8/80 (2013.01); H01F 41/02 (2013.01); C22C 2202/02 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A non-oriented electrical steel sheet, including, in wt %, Si: 2.2 to 4.5%, Mn: 0.5% or less (excluding 0%), Al: 0.001 to 0.5%, Sn: 0.07 to 0.25%, and N: 0.0010 to 0.0090%, and the balance of Fe and inevitable impurities; and
a surface layer portion existing in an inner direction from a surface of the steel sheet and a central portion existing inside the surface layer portion,
wherein the central portion includes N at 0.005 wt % or less, and the surface layer portion further includes N at 0.001 wt % or more compared to the central portion;
the surface layer portion has an average grain size of 60 μm or less, and the central portion has an average grain size of 70 to 300 μm, and wherein among grains of the central portion, a fraction of grains having an angle between a {100} plane and a rolling surface of 150 or less is 30% or more.