Title:
GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND PRODUCTION METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2023/195466
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a grain-oriented electromagnetic steel sheet for which iron loss is further improved in magnetic domain control for forming a laser groove in a cold rolled steel sheet. The present invention provides a grain-oriented electromagnetic steel sheet provided with the following requirements for achieving the abovementioned purpose. In other words, this grain-oriented electromagnetic steel, which comprises a base steel sheet having a plurality of grooves on the surface thereof, and a glass coating on the surface of the base steel sheet, is characterized in that: the absolute value of the angle θ formed by the direction perpendicular to the rolling direction of the base steel sheet and to the sheet thickness direction, and the longitudinal direction of the grooves is 0-40°; the width W of the grooves is 20-300 μm, the depth D of the grooves is 1-40 μm, and the gap P between the grooves in the rolling direction is 1.0-30 mm; and the formula (1) is satisfied, where t1 is the thickness of the glass coating in a flat section of the surface of the base steel sheet, t2 is the thickness of the glass coating at the deepest section of the grooves in the recess of the groove, and t3 is the thickness of the glass coating in the side surface sections of the grooves. (1): (t2＋t3)/2≥t1
Inventors:
YASUDA MASATO (JP)
HAMAMURA HIDEYUKI (JP)
MORISHIGE NOBUSATO (JP)
YAMAMOTO SHINJI (JP)
SUGIYAMA KIMIHIKO (JP)
HAMAMURA HIDEYUKI (JP)
MORISHIGE NOBUSATO (JP)
YAMAMOTO SHINJI (JP)
SUGIYAMA KIMIHIKO (JP)
Application Number:
PCT/JP2023/013939
Publication Date:
October 12, 2023
Filing Date:
April 04, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/12; C22C38/00; H01F1/147; C22C38/06
Domestic Patent References:
| WO2019156127A1 | 2019-08-15 |
Foreign References:
| JP2022022494A | 2022-02-07 | |||
| JP2022509866A | 2022-01-24 | |||
| KR20210080085A | 2021-06-30 |
Other References:
KEIJI SATO: "Heat-resistant magnetic zone subdivided directional electromagnetic steel plate", MATERIA JAPAN, NIHON KINZOKU GAKKAI, SENDAI, JP, vol. 29, no. 3, 1 January 1997 (1997-01-01), JP , pages 153 - 158, XP093097674, ISSN: 1340-2625, DOI: 10.2320/materia.34.777
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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