A three-dimensional flow

heat transfer and solidification coupling mathematical model of ultrathick slab mold was established.According to the actual working condition of slab

effects of the width and thickness change of ultra-thick slab mold on flow and temperature field in mold were analyzed.The results show that with the increase of width of the mold

impacting depth of the liquid steel on the shell is increased and impacting intensity is weaken.Compared with continuous casting conventional slab

liquid surface velocities of the ultra-thick slab are decreased

and then it is decreased with increasing in mold width.In addition

there exists a low flow velocity zone at the nozzle

which is harmful for the protective slag melting.With the increase of mold width

shell thickness tends to uniform.Impact strength of liquid steel at the center is the main reason affecting the uniformity of the shell.With the increase of thickness

impact on the shell of narrow side and velocities of the liquid surface is weaker

while depth of impingement keeps constant.With the increase of thickness

shell heterogeneity becomes serious.The uniformity of the shell is controlled by uniformity of temperature field.