Abstract: In order to reduce the total w_○O in electroslag remelting(ESR)ingots， a thermo-kinetic model of simultaneous reaction is established to predict the interface mass transfer rate. The oxygen transfer behavior in ESR process coupled with electromagnetic-flow-heat-mass transfer was analyzed， and the control methods for w_○O of molten steel were proposed. The results show that with the progress of the remelting process， both the w_○FeO of the molten slag and the w_○O of the molten steel increase， showing the phenomenon of "deoxidation" in the early stage of remelting and "reoxidation" in the later stage. The slag pool-electrode end and slag pool-metal droplet interface are the main locations where the w_○O increases. As the current increases from 1200~1800 A， the w_○O decreases from 82.4 ×10^-6 to 70.6 ×10^-6. The implementation of inert gas protection can decrease the w_○O from 78.7 ×10^-6 to 15.3 ×10^-6. Using 70% CaF₂+30% Al₂O₃ slag system to control w_○O of molten steel has the best effect. The slag system with low w_{○Al▲2O▲3} is beneficial to reduce the w_○O of molten steel.

Key words: electroslag remelting; w_○O; w_FeO; mass transfer; thermodynamic equilibrium; mathematical model