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1. (WO2018159390) GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRODUCTION METHOD THEREFOR

Pub. No.:    WO/2018/159390    International Application No.:    PCT/JP2018/006040
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Wed Feb 21 00:59:59 CET 2018
IPC: C21D 8/12
C22C 38/00
H01F 1/147
C22C 38/60
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: OMURA Takeshi
大村 健
INOUE Hirotaka
井上 博貴
TAKAJO Shigehiro
▲高▼城 重宏
Title: GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRODUCTION METHOD THEREFOR
Abstract:
According to the present invention, it is possible to inhibit the deterioration of magnetostrictive characteristics and core loss for discontinuous regions that are inevitably generated when magnetic domain refinement is performed with multiple irradiation devices by: the steel sheet having flux closure domains that extend in orientations within 30° with respect to the direction perpendicular to the rolling direction of the steel sheet while partially having discontinuous regions; making the length α of a flux closure domain overlap section in said discontinuous region on one surface of the steel sheet in the direction perpendicular to the rolling direction be longer than the length β of the overlap section on the other surface of the steel sheet in the direction perpendicular to the rolling direction; said length α satisfying 0.5≤α≤5.0; and said length β satisfying 0.2α≤β≤0.8α.