[Challenge] the coarse columnar crystals near the center of the coarse granular crystals and surrounding it of the slab, to provide a stable together continuous casting slab continuous casting method that can fine isometric.
The invention relates to using a continuous casting apparatus having an inductive electromagnetic stirring device 7 between the mold in the meniscus 12 to mold under 10m, acid-soluble Al: 0.03% by mass or less, acid-soluble Ti: 0.014~ 0.1 mass%, Mg: 0.0003~0.006% by weight containing the mold while blowing an inert gas containing molten steel from the gas blowing type immersion nozzle 3 N ₂ gas or N ₂ at least 2% by volume It poured into, allowed to added to the molten steel in the mold 11 from among Bi and Sn to be 0.0005 to 0.01 wt% of one or more in total, to pivot the molten steel in a horizontal plane by the inductive electromagnetic stirring apparatus 7 while casting. Accordingly, the slab surface portion and the slab inside the solidification structure, it is possible to produce a stable continuous casting slab were equiaxed crystallization both fine.
.FIELD 1