US 11,732,319 B2
Non-oriented electrical steel sheet
Yoshihiko Oda, Tokyo (JP); Yoshiaki Zaizen, Tokyo (JP); Tomoyuki Okubo, Tokyo (JP); Takaaki Tanaka, Tokyo (JP); and Yukino Miyamoto, Tokyo (JP)
Assigned to JFE Steel Corporation, Tokyo (JP)
Appl. No. 17/414,042
Filed by JFE Steel Corporation, Tokyo (JP)
PCT Filed Dec. 10, 2019, PCT No. PCT/JP2019/048175
§ 371(c)(1), (2) Date Jun. 15, 2021,
PCT Pub. No. WO2020/137500, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-245590 (JP), filed on Dec. 27, 2018; and application No. PCT/JP2019/034896 (WO), filed on Sep. 5, 2019.
Prior Publication US 2022/0049323 A1, Feb. 17, 2022
Int. Cl. C21D 9/46 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/28 (2006.01); C22C 38/34 (2006.01); C22C 38/40 (2006.01); H01F 1/147 (2006.01)
CPC C21D 9/46 (2013.01) [C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/28 (2013.01); C22C 38/34 (2013.01); C22C 38/40 (2013.01); H01F 1/147 (2013.01); C22C 2202/02 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A non-oriented electrical steel sheet
characterized by having
a chemical composition comprising C: not more than 0.005 mass %, Si: 3 to 5 mass %, Mn: not more than 5 mass %, P: not more than 0.1 mass %, S: not more than 0.01 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Zn: 0.0005 to 0.003 mass %, and the remainder being Fe and inevitable impurities,
an average crystal grain size being not more than 40 μm,
a number of inclusions having a diameter of not less than 5 μm being not more than 5/mm2,
a tensile strength being not less than 600 MPa, and
a fatigue strength being not less than 450 MPa.