Improvement of Transition Part of Slab Surface Cleanliness with In-mold Electromagnetic Stirring

Abstract

To react to user's quality demands and the needs for saving the production cost to realize the high quality slab, the transition part of slab surface cleanliness has been improved with electromagnetic stirring (EMS). In the present study, experimental investigation and 3-D fluid dynamic calculation have been carried out for analysis of the influence of velocity on the slab surface cleanliness. The following results are obtained.
(1) A steady level of surface cleanliness is possible to be maintained by providing an average velocity of about 0.2 to 0.4 m/s along the solidification front, irrespective of the cleanliness of the molten steel.
(2) According to 3-D magnetohydrodynamics calculation, electromagnetic stirring technique is useful for improvement of transition part of slab surface cleanliness, especially bottom end part of continuously cast slab.