Grain-oriented electrical steel sheet having high tensile strength insulating film and method of treatment of such insulating film
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United States of America Patent
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Aug 16, 2011
Grant Date -
Sep 17, 2009
app pub date -
May 18, 2007
filing date -
May 19, 2006
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Abstract
Grain-oriented electrical steel sheet having a chrome-free high tensile strength insulating film characterized by comprising steel sheet on the surface of which is formed an insulating film containing a phosphate and colloidal silica as main ingredients and containing crystalline magnesium phosphate uniformly dispersed over the entire surface.
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