Grain oriented silicon steel sheet having low core loss and method of manufacturing same

摘要

Grain oriented silicon steel sheet on which is formed an insulating coating having a thickness that is not less than 2.5 mu m that imparts tension to the steel sheet which does not have an inorganic mineral layer formed during a final annealing step (glass film) and a method of forming on grain oriented silicon steel sheet an insulating coating that is not less than 2.5 mu m thick and which imparts tension to the steel sheet which does not have the inorganic mineral layer (glass film) that forms during finish annealing, and a method of forming a tensioning insulating coating on grain oriented silicon steel sheet which has been finish annealed and does not have an inorganic mineral surface layer (glass film), after first forming a layer of SiO2 not less than 0.001 mu m thick on the oriented silicon steel sheet.