Abstract: The flow behavior of molten steel in the Ruhrstahl-Heraeus（RH）furnace critically influences the efficiency of refining processes,including decarburization and impurity removal.While the widely employed gas-stirring technique effectively enhances molten steel circulation,the associated bubble flow is difficult to control precisely,potentially leading to flow instabilities and uneven energy distribution that limit further gains in refining efficiency.Therefore,in order to optimize the flow behavior within the RH furnace,this paper conducts an optimization simulation of the electromagnetic stirrer in the RH riser.The results show that the inner diameter of the iron core should be minimized to 750 mm to maximize the magnetic field strength;The outer diameter and thickness are optimized to1 500 mm and 100 mm respectively,at which point the magnetic field performance and material cost are balanced;The stirrer is positioned 125 mm from the top to generate the maximum force.When the coil is 75 mm away from the molten steel,the magnetic field distribution of the iron core is the most uniform,without local magnetic concentration areas,and the magnetic field strength of the molten steel reaches a relatively high level;The simulation determines that 110 turns of coil,a frequency of 5 Hz,and an current below 250 Aare the optimal combination,which can generate an average magnetic induction intensity of over 0.04 Tand achieve the best matching of electromagnetic force and penetration depth.After coupling the optimized electromagnetic field into the flow field,the circulation flow increases by 6.3%,which proves the optimization effect of the electromagnetic stirrer.This study clearly defines a set of optimal three-phase six-level electromagnetic stirrer parameters for the RH riser when the inner diameter is 650 mm,providing theoretical basis and parameter guidance for its industrial design.