Numerical simulation of mold filling and solidification process of liquid for Q215 steel 750 mm x450 mm x 120 mm shaped slab concasting mold with single submerged nozzle and double submerged nozzles has been carried out by u- sing CFD commercial software Flow-3 d to get the distribution diagrams of velocity field and temperature field and the location and shape diagrams of free-surface during mold filling process. The effect of single and double submerged nozzle model on velocity field and solidification is analyzed. Results show that double submerged nozzle model is available to lighten the intensity of circumfluence at upper part of mold

decrease impact depth

increase heat transfer efficiency and quicken solidification speed of liquid steel in mold

that is favorable to improve quality of slab and increase casting speed.