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Title:
INSULATING FILM TREATMENT AGENT, GRAIN-ORIENTED ELECTRICAL STEEL SHEET COATED WITH THE FILM TREATMENT AGENT AND INSULATING FILM TREATMENT METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2010013692
Kind Code:
A
Abstract:

To improve the magnetic properties of a grain-oriented electrical steel sheet free from chromic acid by increasing tensile strength of an electrical insulating film of the grain-oriented electrical steel sheet higher than before.

An insulating film treatment agent contains a phosphate and colloidal silica as principal elements, wherein the ratio of the colloidal silica to 100 pts.wt. of the phosphate is 30 to 70 pts.wt. and in metal components in the phosphate, the content of bivalent metallic elements is 20 to 80 wt.%, the content of trivalent metals is 10 to 70 wt.% and the content of metallic elements having 4 or more valences is 3 to 20 wt.%. The grain-oriented electrical steel sheet has a high tensile strength insulating film with a composition obtained by applying the above treatment liquid onto the surface of the steel sheet and baking the liquid.


Inventors:
TAKEDA KAZUTOSHI
TAKAHASHI FUMIAKI
YAMAZAKI SHUICHI
FUJII HIROYASU
ANDO FUMIKAZU
NATORI YOSHIAKI
Application Number:
JP2008174103A
Publication Date:
January 21, 2010
Filing Date:
July 03, 2008
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C23C22/00; C21D9/46; H01F1/18
Domestic Patent References:
JP2007023329A2007-02-01
JP2000169973A2000-06-20
JP2000178760A2000-06-27
JP2007217758A2007-08-30
JP2004068031A2004-03-04
Foreign References:
WO2007136115A12007-11-29
Attorney, Agent or Firm:
Hiroaki Tamura
Tsugeko Shigeo
Yoshiyuki Watanabe



 
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