	US 12,215,399 B2
	Non-oriented electrical steel sheet and method for producing same
Hiroyasu Fujii, Tokyo (JP); Jun Maki, Tokyo (JP); Kazutoshi Takeda, Tokyo (JP); Hiroyuki Mimura, Tokyo (JP); Yusuke Kanto, Tokyo (JP); and Shuichi Yamazaki, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/440,646
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Apr. 17, 2020, PCT No. PCT/JP2020/016809 § 371(c)(1), (2) Date Sep. 17, 2021, PCT Pub. No. WO2021/210149, PCT Pub. Date Oct. 21, 2021.
Prior Publication US 2022/0316022 A1, Oct. 6, 2022
Int. Cl. C21D 8/12 (2006.01); H01F 1/18 (2006.01)

CPC C21D 8/1283 (2013.01) [H01F 1/18 (2013.01)]

10 Claims

1. A non-oriented electrical steel sheet, comprising:

a base metal steel sheet, and

a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet,

wherein:

a molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and

after boiling the non-oriented electrical steel sheet for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more;

where, a method for determining the amount of soluble Zn is in accordance with JIS K 0102:2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”.