Orientation electric steel plate with excellent film covering characteristics and its making method

Application Number  00128416 Application Date  2000.09.14
Publication Number  1291661 Publication Date  2001.04.18
Priority Information   2000/5/10 JP 137551/2000; 1999/9/14 JP 261050/1999  
Applicant(s) Name  Nippon Steel Corp.  
Inventor(s) Name  Taketa Kazutoshi;Yamazaki Shuichi;Ohayashi Hideyuki  
Patent Agency Code  11038 Patent Agent  duan chengen
AbstractA high permeability grain-oriented electromagnetic steel sheet with a higher tension-imparting effect and more excellent cohesion and magnetic properties compared to the prior art, which also maintains sufficient corrosion resistance to withstand practical use; the grain-oriented electromagnetic steel sheet has on its surface an insulation coating comprising a first layer composed mainly of a divalent or trivalent metal hydrogen phosphate salt and silica, and a second layer composed mainly of aluminum borate and having a surface roughness of 0.1 mu m to 0.35 mu m in terms of Ra (center line average roughness).