Title:
GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MAGNETIC-DOMAIN-REFINEMENT THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/121253
Kind Code:
A1
Abstract:
A grain-oriented electrical steel sheet according to one embodiment of the present invention comprises a plurality of line-shaped deformation parts formed in the rolling direction, and at least two regions, in which intervals between the deformation parts are changed in response to a sensitivity index (Ks) calculated through the following formula 1 over the full length of the steel sheet and differ from each other, are present. [Formula 1] Ks=(0.7×Ds+0.3×B8)/10 (wherein Ks denotes a sensitivity index, Ds is the particle diameter (mm) of crystal grain, and B8 denotes magnetic flux density (T) measured in a magnetic field strength of 800A/m.)
Inventors:
KWON OHYEOUL (KR)
KIM WOOSIN (KR)
HAN KYUSEOK (KR)
KIM WOOSIN (KR)
HAN KYUSEOK (KR)
Application Number:
PCT/KR2022/020884
Publication Date:
June 29, 2023
Filing Date:
December 20, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C21D8/12; B23K26/364; C22C38/34; H01F1/147
Domestic Patent References:
| WO2016171129A1 | 2016-10-27 |
Foreign References:
| KR20200076508A | 2020-06-29 | |||
| JPH1187122A | 1999-03-30 | |||
| KR20210079129A | 2021-06-29 |
Other References:
SUZUKI HIROSHI, AKITA KOICHI, MISAWA HIROSHI, IMAFUKU MUNEYUKI: "Mechanism of Magnetic Domain Refinement on Grain-Oriented Silicon Steel by Laser Irradiation", JOURNAL OF THE SOCIETY OF MATERIALS SCIENCE, vol. 8, no. 4, 15 December 2002 (2002-12-15), JP , pages 207 - 212, XP093074481, ISSN: 0514-5163, DOI: 10.2472/jsms.51.12Appendix_207
Attorney, Agent or Firm:
YOU ME PATENT AND LAW FIRM (KR)
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