Effect of High Frequency Electromagnetic Field on Initial Solidification of Molten Steel in Soft-Contact Mold

摘要

Aiming at the process of electromagnetic soft-contact continuous casting, a three dimensional finite element model of electromagnetic field and temperature field was developed to research the effects of high frequency electromagnetic field on the process of billet initial solidification in soft contact mold under various conditions of casting speeds and mold structural parameters. The results show that the Joule heat induced by the high frequency electromagnetic field in molten steel has significant effects on the initial solidification process, which appear as lowering the starting point of the initial solidification, thinning the initial solidified shell and increasing the billet surface temperature. These effects of high frequency electromagnetic field can be greatly weakened by increasing the casting speed, whereas these effects are remarkably enhanced by increasing the slit width and slit number on mold wall.