Downward Flow Diffusion and Meniscus Flow by Means of Electromagnetic Stirring

摘要

In order to obtain superior surface steel quality as well as superior inner steel quality, flow dynamic control by electromagnetic force is considered to be an important tool in continuous casting process. To realize not only appropriate velocity at the meniscus but also downward flow diffusion, a new process with rectangular nozzle and electromagnetic stirring (EMS) is proposed. The usefulness is evaluated by magnetohydrodynamic (MHD) calculation. In EMS OFF condition, the downward flow is large at the center of the width and the meniscus velocity is small, because of the submerged nozzle flow. In EMS ON condition, the downward flow becomes small enough and there is appropriate velocity at the meniscus. Since the direction of the downward flow from the submerged nozzle is orthogonal to the electromagnetic force direction, the downward flow can be diffused and diminished, only when the electromagnetic force is too large and the downward flow is small enough.