常规炼钢脱氧元素与氧平衡理论分析

Analysis on Equilibrium Theory between Deoxidizing Elements and Oxygen in Conventional Steelmaking

通过常规脱氧元素与氧平衡的热力学分析,结合工业生产结果,探讨了Al、Ti、Si、Nb、Mn的脱氧能力。得出结论,只有控制顶渣中氧化铁活度<0.1,才可实现与之相平衡的钢液中的氧活度为0.022 9,进而减轻顶渣向钢液供氧;Al是常规脱氧剂中最强的脱氧元素,主要元素的控氧能力依次为Al>Ti>Si>Nb>Mn,体系最终氧活度将取决于与氧结合能力最强的元素。

Based on the thermodynamic analysis on the equilibrium between deoxidizing ele- ments and oxygen in conventional steelmaking the deoxidization power of these elements such as Al, Si, Ti, Nb and Mn were discussed combining with industrial production results. It was conclud- ed that the oxygen activity in molten steel in equilibrium with the FeO activity can be 0.022 9 by only controlling the FeO activity of top slag to be less than 0.1, which can reduce the amount of oxygen supply to molten steel from top slag. Aluminium was the most powerful deoxidizing element among the conventional deoxidizers. So the main elements for deoxidation according to their oxy- gen-controlling power were A1, Ti, Si, Nb, and Mn in proper order. The final oxygen activity in the order would depend on the most powerful element which was united with oxygen.