Abstract: This study utilizes a low-Reynolds number k-εturbulence model to construct a three-dimensional magnetohydrodynamic coupling numerical model,investigating the impact of electromagnetic stirring（EMS）current intensity and stirrer positioning on the flow,heat transfer,and solidification behavior of molten steel within the continuous casting mold for 140 mm×140 mm billets of 82 Bsteel at a particular steel plant.The results demonstrate that the current intensity is a critical determinant of stirring efficacy;increasing the current intensity leads to a reduction in the depth of the primary steel jet impact,an increase in tangential velocity,and accelerated dissipation of superheat within the mold,resulting in a thinner solidified shell and a scouring effect on the shell due to backflow near the mold,which appears a slow growth zone in shell thickness.Variations in stirrer positioning also alter the flow field characteristics;the lower the position,the more the main flow core descends,and the position and shape of the vortex change accordingly,reducing liquid surface fluctuations,although an excessively high exit tangential velocity may lead to uneven shell growth.For the continuous casting production of high-carbon steel billets at this plant,it is beneficial to appropriately elevate the EMS installation to 515 mm and enhance the stirring current intensity to the rated 600A.This configuration keeps the liquid surface fluctuations within a controllable range and further promotes rapid dissipation of superheated molten steel,while also ensuring a certain degree of undercooling at the center of the foot rolling area,facilitating early nucleation of molten steel and enhancing the ratio of equiaxed grains,which is advantageous for improving the center segregation of the billet.