The paper mainly discusses the ultra-low phosphorus steel with double slag process in 120 t convert-er,analyzes the principle of converter dephosphorizing process and performs the smelting test,the results show that the molten steel temperature,the slag basicity and the FeO content in slag are the major factors influencing the converter dephosphorization,rational slag basicity,FeO content and end point temperature can effectively improve the converter dephosphorization rate,stably produce the ultra-low phosphorus steel,which lays solid foundation for the enterprise to produce high end steel grade and is of positive significance for improving the competitive power of the enterprise.
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