in a continuous casting method including applying an ac magnetic field to the molten steel in the mold, thereby creating a swirling and stirring flux in the molten steel in the mold, an appropriate ac magnetic flux density is provided according to the submergence depth of a submerged inlet valve and the distance from the surface of the molten steel in the mold to the location of the peak of the ac magnetic field to produce a high quality bead. a continuous steel casting method according to the present invention is a continuous steel casting method including applying an ac magnetic field to the molten steel in the mold by means of ac magnetic field generation devices, thereby creating a horizontal swirl flow and stirring the molten steel in the mold, each of the magnetic field generating devices being placed on a rear surface of a corresponding side of a pair of long mold sides, the magnetic field generating devices being turned together. a spacing between the long sides of the mold facing each other is 200 to 300 mm, a submerged inlet valve has two discharge ports, each discharge port having a discharge angle within a range of 5 ° in a downward direction at 50 ° in a downward direction, the ac magnetic field has a frequency of 0.5 hz or greater and 3.0 hz or less, and, according to a location of a peak in the ac magnetic field, a submergence depth of the valve submerged input and magnetic flux density at the location of the peak magnetic field ac generated by the magnetic field generation devices ac are controlled to be within a predetermined range.
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