Patent ID: 6432222
Filing Date: 2002-08-13
Classification: C21D,C22C,C23C

Abstract:
A method for producing a grain-oriented electrical steel sheet excellent in magnetic properties, comprising the steps of:heating a slab containing 0.01 to 0.10 mass % of acid soluble Al (sAl) to a temperature (slab heating temperature Ts (Â° C.)) lower than 1350Â° C. and higher than complete solution temperature of substances having capacities as inhibitors; hot-rolling the heated slab into a hot rolled strip, optionally annealing the hot rolled strip, cold-rolling the hot rolled strip, in one stage or in two or more stages with intermediate annealing(s) to provide a cold rolled sheet; decarburization annealing the cold rolled sheet; nitriding treating the decarburization annealed steel sheet before commencement of secondary recrystallization during final box annealing; final box annealing the decarburization annealed steel sheet after application of an annealing separator to prevent sheet sticking during final box annealing.