Procduction Practice of Q345qE Steel with Fluorine-free Slag System in LF Refining
Based on the characteristics of different refining slag systems,a fluorine-free CaO-Al2O3-SiO2 slag system is selected,and the optimal chemcial composition of the refining final slag for aluminum containing steel is de-termined,i.e.,w(CaO)of 51％～54％,w(SiO2)of 4％～7％,and w(Al2O3)of 28％～31％.The deoxidation process of the converter is optimized,and the top slag control is implemented during the converter steelmaking to obtain the target slag system.The slag recycling technique is applied,the fluorite addition operation during refining is can-celled.The production practice shows that the fluorine-free slag system satisfies the requirements of Q345qE steel pro-duction by BOF-LF-CC process,which lays the solid foundation for efficient and clean production.
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