In an eleetroslag remelting (ESR) process, gas protection is the most effective method to control the oxidation of easily oxidized elements in steel, but the protection effect mostly depends on the process parameters of the gas injection inside the protective atmosphere hood. In this work, the characteristic of shielding gas flow in protective atmosphere hood is analyzed based on the mathematical model of turbulent flow in the protective atmosphere hood established with a software-FLUENT. The optimal process parameters including pumping speed, argon injection angle, blowing flow have been obtained by simulation of flow field above the slag bath which is based on the basic conservation laws and equations of turbulence control. By changing the exhaust velocity of the exhaust port, the injection angle and flow rate of argon, gas domain above the slag bath was calculated. The flow field and the concentration field of argon and air in the gas domain were obtained. The results show that the optimal pumping speed is 3m/s, the optimal argon injection angle is 75°and the optimal argon flow rate is 60m3/h under the experimental conditions.
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