电渣重熔过程钢中氧含量预测及控制

为降低电渣钢锭中的总w_○O,建立了预测界面传质速率的同步反应热-动力学模型,对电渣重熔过程的氧传递行为与电磁-流动-传热-传质进行耦合分析,并提出钢液中w_○O的控制方法.结果表明,随重熔过程的进行,熔渣中w_○FeO和钢液中w_○O均升高,呈现重熔前期“脱氧”、后期“增氧”的现象,渣池-电极端部和渣池-金属熔滴界面是w_○O升高的主要位置.当电流为1200~1800A时,熔炼相同长度电极时的钢液中w_○O从82.4×10^-6降低到70.6×10^-6;采用惰性气体保护,使钢液中w_○O从78.7×10^-6降低到15.3×10^-6;使用70% CaF₂+30% Al₂O₃渣系控制钢液中w_○O的效果最佳,低w_○Al2O3的渣系有利于降低钢液中w_○O.

Prediction and Control of Oxygen Content in Steel During Electroslag Remelting Process

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_○Al2O3 is beneficial to reduce the w_○O of molten steel.