Patent ID: 8047265
Filing Date: 2011-11-01
Classification: B22D

Abstract:
1. A method for stirring molten steel, comprising (i) providing an apparatus containing molten steel, said apparatus comprising a mold and an electromagnetic stirrer coil comprising a coil formed by a water cooled copper pipe having an outer diameter of 4 mm or less wound around a yoke for stirring molten steel in said mold by electromagnetic force, wherein said electromagnetic stirrer coil is arranged along a length direction of a side of said mold and is parallel to said length direction of said side of said mold and is characterized in that a space factor of a yoke sectional area located within an inside area of a vertical cross-section of said coil formed by the copper pipe with respect to said inside area is in the range of 0.5 to 0.9 and a yoke width B is 100 mm to 300 mm; and (ii) stirring molten steel in said mold by supplying a current through said electromagnetic stirrer coil wherein said electromagnetic stirrer coil generates a magnetomotive force F wherein F/B is in the range from 800 kAT/m to 1400 kAT/m.