Abstract: The effect of stand electromagnetic stirring on the fluid flow and heat transfer behavior of molten steel during continuous casting ofφ800mm round billet was investigated.The results indicate that the stirring position has an important influence on the flow state,flow direction,stirred volume,and cooling rate in the molten steel.Within the strand zone,lowering the stirring position reduces the angle between the radio flow direction of the solidification front from 30°to 0°,while the helical angel of the longitudinal flow trajectory increases from 30°to 55°．The flow tendency toward the core weakened,and the stirring velocity at the solidification front decreased from 0.008m/s to 0.003 6m/s.Among them,when the stirrer is located in the upper-middle section of the CET zone,the flow stability of the molten steel is significantly improved.The stirring speed at the solidification front is 0.005 6m/s,and the effective stirring volume of molten steel is the largest,which is 0.045 3m3,with a tendency to flow to the core.In terms of heat transfer,the heat loss of molten steel in the stirring zone is faster.When the stirring is in the upper-middle section of the CET zone,it is beneficial to improve the equiaxed crystal rate and accelerate the solidification rate of the billet.Therefore,the stand electromagnetic stirring position in the upper-middle section of the CET zone is the best,which provides an important guiding significance for the optimization of the electromagnetic stirring process.