METHOD FOR PRODUCING A GRAIN-ORIENTED ELECTRICAL STEEL STRIP

摘要

The invention relates to a method for producing a high-grade grained-oriented electric steel strip, in particular to a method for producing so-called HGO-material (Highly Grain Oriented-Material) by a continuous thin slab casting method from a steel alloy containing 2,5-4.0 mass % Si, 0.02-0.10 mass % C, and 0.01-0.50 % Al wherein said invention offers an operation sequence, whose individual stages are co-ordinated in such a way that they make it possible to obtain an electric steel sheet exhibiting optimised properties by means of conventional units, wherein said individual stages consist in carrying out a secondary metallurgical treatment of a melt, in continuously casting the melt for forming a bar, in dividing said bar into thin slabs, in heating said slabs, in continuously carrying out hot rolling of said thin bars for forming a hot-rolled strip, in cold-rolling the hot strip for obtaining a cold strip, in carrying out a recrystallisation and decarbonisation annealing of the cold strip, in applying an annealing separator on the strip surface and in finely annealing the cold strip exposed to the recrystallisation and decarbonisation annealing for shaping a Goss structure in such a way that it makes it possible to produce an electric steel sheet exhibiting optimised electromagnetic properties by using conventional units.