Grain oriented electrical steel sheet and method

C - Chemistry – Metallurgy – 25 – D

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C25D 5/36 (2006.01) C21D 8/12 (2006.01) C23C 28/00 (2006.01) C25D 5/26 (2006.01) C25D 5/48 (2006.01) C25F 3/24 (2006.01) H01F 1/147 (2006.01)

Patent

CA 2249749

Grain oriented electrical steel sheet witha very low iron loss and a method for producing the same, wherein the surface of the iron substrate of the grain oriented electrical steel sheet is subjected to an enhancement treatment of crystal grain orientation or surface smoothing to a mean roughness of about 0.20 µm or less, electroplating a chromium et al plating layer on the substrate with heterogeneous growth, and applying a tension coating film to the plating layer.

Divulgation d'une feuille d'acier électrique à grains orientés présentant une très faible perte de fer et d'une méthode pour produire celle-ci, au cours de laquelle la surface du substrat de fer de la feuille d'acier électrique à grains orientés est soumise à un traitement d'amélioration de l'orientation du grain ou de polissage superficiel jusqu'à l'obtention d'une rugosité moyenne d'environ 0,20 µm ou moins, à une électrodéposition d'une couche de chrome sur le substrat par croissance hétérogène, et à l'application d'un film de tension protecteur sur la couche de placage.

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