US 12,215,410 B2
Grain oriented electrical steel sheet, forming method for insulation coating of grain oriented electrical steel sheet, and producing method for grain oriented electrical steel sheet
Ichiro Tanaka, Tokyo (JP); Takashi Kataoka, Tokyo (JP); Kazutoshi Takeda, Tokyo (JP); Tomoya Suenaga, Tokyo (JP); and Yuki Kunita, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/422,517
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Jan. 16, 2020, PCT No. PCT/JP2020/001238
§ 371(c)(1), (2) Date Jul. 13, 2021,
PCT Pub. No. WO2020/149356, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-005237 (JP), filed on Jan. 16, 2019.
Prior Publication US 2022/0090241 A1, Mar. 24, 2022
Int. Cl. C22C 38/06 (2006.01); C21D 3/04 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); H01F 1/147 (2006.01)
CPC C22C 38/06 (2013.01) [C21D 3/04 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); H01F 1/147 (2013.01); C21D 2201/05 (2013.01); C22C 2202/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A grain oriented electrical steel sheet without a forsterite film characterized in that the grain oriented electrical steel sheet comprises:
a base steel sheet;
an oxide layer arranged in contact with the base steel sheet; and
a tension-insulation coating arranged in contact with the oxide layer,
wherein the base steel sheet includes, as a chemical composition, by mass %,
2.5 to 4.0% of Si,
0.05 to 1.00% of Mn,
0 to 0.01% of C,
0 to 0.005% of S+Se,
0 to 0.01% of sol.Al,
0 to 0.005% of N,
0 to 0.03% of Bi,
0 to 0.03% of Te,
0 to 0.03% of Pb,
0 to 0.50% of Sb,
0 to 0.50% of Sn,
0 to 0.50% of Cr,
0 to 1.0% of Cu, and
a balance consisting of Fe and impurities,
the oxide layer is an iron oxide layer,
when the iron oxide layer is analyzed by a fourier transform infrared spectroscopy, when A650 is an absorbance of an absorption peak detected at 650 cm−1 in an infrared absorption spectrum, and when A1250 is an absorbance of an absorption peak detected at 1250 cm−1 in the infrared absorption spectrum, the A650 and the A1250 satisfy 0.2≤A650/A1250≤5.0, and a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.