Abstract
In order to analyse the influence of the soft reduction of secondary cooling zone on the flow field of molten steel in the mold and the secondary cooling zone, a three-dimensional model including the submerged entry nozzle, the mold and the secondary cooling zone was established. The influence of the soft reduction of secondary cooling zone on the flow characteristics and the fluctuation of free surface in the mold and the secondary cooling zone is analyzed. The results show that: (1) There are two vortex regions in the mold and the secondary cooling zone, which are above and below the nozzle jet. Compared with the slab thickness of 52 mm, the vortex area above and below the nozzle jet is larger when the slab thickness is 72 mm.
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