PROCESS FOR PRODUCING GRAIN-ORIENTED MAGNETIC STEEL SHEET WITH HIGH MAGNETIC FLUX DENSITY

摘要

The present invention provides a method of production of grain-oriented electrical steel sheet comprising making a slab heating temperature 1280oC or less, annealing hot rolled sheet by (a) a process of heating it to a predetermined temperature of 1000 to 1150°C to cause recrystallization, then annealing by a temperature lower than that of 850 to 1100°C or by (b) decarburizing in annealing the hot rolled sheet so that a difference in amounts of carbon of the steel sheet before and after annealing the hot rolled sheet becomes 0.002 to 0.02 mass% and performing the heating in the temperature elevation process of the decarburization annealing under conditions of a heating rate of 40°C or more, preferably 75 to 125°C/s while the temperature of the steel sheet is in a range from 550°C to 720°C and utilizing induction heating for rapid heating in the temperature elevation process of decarburization annealing.