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针对不锈钢氧化脱磷容易导致合金元素铬损耗的问题,在中频感应炉中采用20%CaO-45%BaO-15%Fe2O3-10%Cr2O3-10%CaF2渣系进行氧化脱磷试验。在热力学计算的基础上,通过调配BaO含量、钢液中初始碳含量和钢水处理温度,获得脱磷率不低于50%,脱磷过程中铬氧化量不超过8%的试验结果。试验研究表明:该试验渣系的脱磷效果比CaO渣系好,与BaO渣系相当;随着钢液中碳含量的提高,脱磷率增加、铬损减小;随着熔炼温度的升高,脱磷率降低、铬损减小,在1 750 K时脱磷率和铬损耗处于最优化水平。
Aiming at the problem that stainless steel oxidative dephosphorization easily lead to chromium loss of alloying elements, oxidative dephosphorization was carried out in a medium frequency induction furnace with 20% CaO-45% BaO-15% Fe2O3-10% Cr2O3-10% CaF2 slag system. On the basis of thermodynamic calculation, the results of the experiment were obtained by adjusting the content of BaO, the initial carbon content in molten steel and the temperature of molten steel treatment. The results showed that the dephosphorization rate was not less than 50% and the amount of chromium oxidation did not exceed 8% during dephosphorization. The experimental results show that the dephosphorization effect of the test slag system is better than that of CaO slag system and that of BaO slag system. With the increase of carbon content in molten steel, the dephosphorization rate increases and the chromium loss decreases. With the increase of melting temperature High, dephosphorization rate decreases, chromium loss decreases, at 1 750 K dephosphorization rate and chromium loss at the optimal level.