Nippon Steel Corporation

Thyssenkrupp Electrical Steel Gmbh

Koji Kanehashi

Kazutoshi Takeda

Masaru Takahashi

Shuichi Yamazaki

Hiroyasu Fujii

Ludger Lahn

Carsten Schepers

Hirohiko Sato

Regis Lemaitre

Régis LEMAîTRE

A solution for forming an insulation coating of grain-oriented electrical steel sheet includes an aqueous solution prepared by mixing a phosphate solution and colloidal silica. Chromium is not added to the aqueous solution. The colloidal silica includes silica particles surface-modified by an aluminate or is prepared by adding an aluminate to colloidal silica such as conventional colloidal silica.

Solution for forming insulation coating and grain-oriented electrical steel sheet

An electrical steel sheet () includes a base material () of electrical steel, and an insulating film () formed on a surface of the base material (). The insulating film () contains a phosphates of one or more selected from the group consisting of Al, Zn, Mg and Ca. The phosphate exhibits a specific peak having a top within a range of &#x2212;26 ppm to &#x2212;16 ppm in a solidP-NMR spectrum, and a proportion of an integrated intensity of the specific peak relative to an integrated intensity of all peaks in the solidP-NMR spectrum is 30% or more.

Electrical steel sheet

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Tokyo, Japan

Koji Kanehashi