公开(公告)号：EP3570305A1

公开(公告)日：2019-11-20

申请号：EP18739316.0

申请日：2018-01-10

申请人： Nippon Steel Corporation

发明人： MIZUMURA Takahito ,  MIZOKAMI Masato ,  YABUMOTO Masao ,  UEMURA Toshihiko ,  MINEMATSU Eisuke ,  TAKAHASHI Fumiaki

IPC分类号： H01F27/25 ,  H01F1/147 ,  H01F41/02

摘要： A wound core is formed by laminating a plurality of bent bodies formed from a grain-oriented electrical steel sheet having a coating containing phosphorus formed on a surface, in a sheet thickness direction of the grain-oriented electrical steel sheet, in which the bent body is formed in a rectangular shape by having four flat portions and four corner portions adjacent to the flat portions, the corner portion has a bent region having a total bending angle of approximately 90° in a side view, the number of deformation twins present in the bent region in the side view is five or less per 1 mm of a length of a center line in the bent region in the sheet thickness direction, and the amount of phosphorus eluted from the corner portion in a case of being boiled in water for 30 minutes is 6.0 mg or less per 1 m 2 of a surface area of the corner portion.