Title:
GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/096082
Kind Code:
A1
Abstract:
The objective of the present invention is to provide a grain-oriented electromagnetic steel sheet with low iron loss that does not have a forsterite coating (glass coating) and is heat-resistant domain-controlled. A grain-oriented electromagnetic steel sheet according to the present invention comprises: no forsterite coating on the surface of a base steel sheet; a tension coating (insulation coating); a plurality of grooves on the surface; and a SiO2 intermediate layer and an insulation coating in this order on the surface of the steel sheet, the tension coating having a coating tension of 10 MPa or greater. The grain-oriented electromagnetic steel sheet further comprises a SiO2 internally oxidized layer immediately below the surface of the base steel sheet. The recess-protrusion of the surface of the steel sheet and the internally oxidized layer is between 0.001 µm and 0.100 µm both inclusive.
Inventors:
YASUDA MASATO (JP)
MORISHIGE NOBUSATO (JP)
TAKATANI SHINSUKE (JP)
YAMAMOTO SHINJI (JP)
HAMAMURA HIDEYUKI (JP)
MORISHIGE NOBUSATO (JP)
TAKATANI SHINSUKE (JP)
YAMAMOTO SHINJI (JP)
HAMAMURA HIDEYUKI (JP)
Application Number:
PCT/JP2023/039510
Publication Date:
May 10, 2024
Filing Date:
November 01, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C23C22/00; H01F1/147; C21D8/12; C21D9/46; C22C38/60
Foreign References:
| JP2002309381A | 2002-10-23 | |||
| JP2003301272A | 2003-10-24 | |||
| JPH083648A | 1996-01-09 | |||
| JPH06184762A | 1994-07-05 | |||
| JP2015086426A | 2015-05-07 | |||
| JP2001026847A | 2001-01-30 | |||
| CN114561512A | 2022-05-31 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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