PROBLEM TO BE SOLVED: To solve such a problem that inclusions in a cast slab may increase according to casting conditions and conditions for applying an electromagnetic force when both of a movable magnetic field generating device arranged in the upper portion of a casting mold and a stationary magnetic field generating device arranged in the lower portion of the casting mold are used simultaneously aiming at improving the cleanliness of the cast slab.;SOLUTION: When a DC magnetic field is applied in the direction of the thickness of the cast slab in the casting mold by means of a DC magnetic field generating device arranged in the continuous casting mold and a continuous flow of molten steel is formed in front of the solidified shell in the surface position of the molten steel by means of the movable magnetic field generating device arranged in the neighborhood of the position of the surface of the molten steel in the casting mold, a relational expression is controlled so as to satisfy a certain range, wherein relational expression is composed of a thrust force in the movable magnetic field generating device, the density of the magnetic flux in the DC magnetic field generating device, a casting speed, the width of the casting mold, and the flow rate of Ar gas to be injected into the casting mold via an injection nozzle.;COPYRIGHT: (C)2008,JPO&INPIT
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