Optimum magnetic flux density in quality control of casts with level DC magnetic field in continuous casting mold

Application of level DC magnetic field (LMF) in continuous casting mold dec reases the mixing length at the ladle change region in sequential casting o f different steel grades and improves the inclusion quality of cast slabs. Until now control condition for the mixing of steel compositions which depe nds on the fluid flow of molten steel has only been clarified. However, con trol condition for the inclusion whose behavior is not always the same as t he behavior of the molten steel flow has not been clarified yet. In this st udy, continuous casting experiment and numerical analysis were conducted to derive the control index for inclusion and to estimate the optimum conditi on for improvement of inclusion quality In cast slabs with LMF. The followi ngs are results: Optimum magnetic flux density exists to control the inclus ion quality in cast slabs with LMF Inclusion behavior is explained by the b alance between the penetration of inclusion controlled by magnetic field an d the floatation of inclusion. This optimum magnetic flux density can be ch aracterized by the interaction parameter, which is expressed by the ratio o f inertial force caused by pouring flow to magnetic braking force (Lorentz' s force) caused by magnetic field.