GRAIN-ORIENTED ELECTRICAL STEEL SHEET, TRANSFORMER STACKED CORE USING SAME, AND METHOD FOR PRODUCING STACKED CORE

WIPO Patent Application WO/2019/151401

A1

Provided is a grain-oriented electrical steel sheet with the outstanding effect of reducing transformer core loss when used in the stacked core of a transformer. This grain-oriented electrical steel sheet is used in the stacked core of a transformer, and a sheet thickness t of the steel sheet and the deterioration of core loss if the steel sheet is subjected to elliptical magnetization as defined by formula (1) satisfy the following relationships. If sheet thickness t≤0.20 mm, deterioration of core loss does not exceed 85%, if 0.20 mm