To stably produce an ultrahigh magnetic flux density grain oriented silicon steel sheet having excellent magnetic properties.
In the method for casting a cast slab for grain oriented silicon steel sheet, the content of Bi in a steel is controlled to 0.0005 to 0.05 mass%, a region divided by providing an upper weir is formed in a molten steel pool on the outlet side of a tundish, and, as an iron-coated wire filled with Bi or a Bi alloy is fed into the region, the flow rate density Q of the molten steel in an immersion nozzle obtained by dividing the flow rate of the molten steel by the inner area of the nozzle, and the thrust F of electromagnetic stirring for forming a rotating flow in the vicinity of the molten steel surface satisfy the relational inequalities of Q≥0.9(ton/m2/s), and 3,000≤F≤10,000(Pa/m). Further, the uniformity standard deviation σ/the average concentration A in the concentration of the Bi in the cast slab satisfies the relational inequalities of 0.0005≤A≤0.05(%), and σ/A≤0.2.
NAGASHIMA MASAKI
KONNO TOSHIHIRO
NANBA HIDEKAZU
MIZUKAMI KAZUSANE
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Hisataka Tanaka