ELECTRICAL STEEL SHEET WITH INSULATING COATS DIFFERENT IN THICKNESS

PURPOSE:To improve the weldability of an electrical steel sheet as well as the suitability to blanking by forming org. insulating coating films different in thickness on the front and rear sides of the steel sheet. CONSTITUTION:Org. insulating coating films or org.-inorg. mixed insulating coating fi...

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Bibliographische Detailangaben
Hauptverfasser:	JITSUKAWA MASAHARU, KAKIMOTO HISAYOSHI, MITSUNARI MOTONOBU, TANABE SHUNICHI, KAZAMA SHINICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE:To improve the weldability of an electrical steel sheet as well as the suitability to blanking by forming org. insulating coating films different in thickness on the front and rear sides of the steel sheet. CONSTITUTION:Org. insulating coating films or org.-inorg. mixed insulating coating films are formed on both sides of an electric steel sheet so that the film on the front side is made thicker than the film on the rear side. When the steel sheet is blanked from the front side with a punch, satisfactory suitability to blanking is ensured by the lubricity of the film. Since the suitability to blanking is not largely dependent on the film on the rear side, the film is made thin so as to prevent the deterioration of weldability. The pref. total thickness of the org. insulating coating films is 0.4-2.5mum and that of the org.- inorg. mixed insulating coating films is 0.4-3.0mum.