GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET

WIPO Patent Application WO/2023/204299

A1

Provided is a grain-oriented electromagnetic steel sheet that enables reduction of iron loss and improvement of adhesiveness of a secondary coating film. In the grain-oriented electromagnetic steel sheet according to the present embodiment, when a glow discharge emission spectrometric analysis is carried out from the surface of the secondary coating film in a thickness direction of a base material steel sheet, a glow emission spectrum indicating relationships between a sputtering time and emission intensity of Mg and between a sputtering time and emission intensity of Sn is obtained, wherein when the maximum emission intensity of Mg is defined as IMg/Mg and the emission intensity of Sn at the sputtering time at which Mg reaches the maximum emission intensity is defined as ISn/Mg in the glow emission spectrum, the intensity ratio Iref defined by formula (1) is between 0.0000 and 0.0006, and the iron loss W17/50 is less than 0.90 W/kg.　(1): Iref=ISn/Mg/IMg/Mg

WO/1993/023576	METHODS AND APPARATUS FOR EFFECTING DOMAIN REFINEMENT OF ELECTRICAL STEELS
JPH05287462	SUPERFINE CRYSTAL ALLOY FOR TRANSFORMER IRON CORE AND ITS PRODUCTION
JPH0668132	PROBLEM TO BE SOLVED: To manufacture a unidirectional silicon steel sheet having excellent magnetic properties

ATSUMI HARUHIKO (JP)
YAMAGATA RYUTARO (JP)
KATAOKA TAKASHI (JP)
KUNITA YUKI (JP)

PCT/JP2023/015892

October 26, 2023

April 21, 2023

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NIPPON STEEL CORP (JP)

C21D8/12; C22C38/00; C22C38/60; H01F1/147

WO2020162611A1

2020-08-13

JP2017101311A	2017-06-08
JP2012180545A	2012-09-20

ASCEND IP LAW FIRM (JP)

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