US 12,448,662 B2
Non-oriented electrical steel sheet and method for producing same
Yoshiaki Zaizen, Tokyo (JP); Yoshihiko Oda, Tokyo (JP); Tomoyuki Okubo, Tokyo (JP); Takaaki Tanaka, Tokyo (JP); and Yukino Miyamoto, Tokyo (JP)
Assigned to JFE Steel Corporation, Tokyo (JP)
Appl. No. 17/413,752
Filed by JFE Steel Corporation, Tokyo (JP)
PCT Filed Aug. 27, 2019, PCT No. PCT/JP2019/033418
§ 371(c)(1), (2) Date Jun. 14, 2021,
PCT Pub. No. WO2020/136993, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-245507 (JP), filed on Dec. 27, 2018.
Prior Publication US 2022/0056548 A1, Feb. 24, 2022
Int. Cl. C21D 9/46 (2006.01); C21D 1/74 (2006.01); C21D 6/00 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/60 (2006.01); H01F 1/147 (2006.01)
CPC C21D 9/46 (2013.01) [C21D 1/74 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1266 (2013.01); C21D 8/1272 (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); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/60 (2013.01); H01F 1/147 (2013.01); C21D 2241/00 (2013.01); C22C 2202/02 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.0050 mass %, Si: 3.6 to 6.5 mass %, Mn: 0.05 to 2.0 mass %, P: not more than 0.10 mass %, S: not more than 0.0050 mass %, Al: 0.7 to 2.0 mass %, N: not more than 0.0050 mass %, Zn: 0.0005 to 0.0050 mass %, Ti: not more than 0.0030 mass %, Nb: not more than 0.0030 mass %, O: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities, characterized in that t, N1 and N2 satisfy the following equation (1):
(t×N2)/{(t/10)×N1}≥5.0  (1),
where t (mm) represents a steel sheet thickness, N1 (mass %) represents a concentration of nitrogen present as AlN in a layer from a one-side surface of the steel sheet to a depth of 1/20 of the sheet thickness, and N2 (mass %) represents a nitrogen concentration present as AlN in an entire sheet thickness.