The water modelling experiments of 300tconverter concerning combined blowing parameters,the number,and configuration of bottom nozzles are carried out.The results show that the arrangement of 16bottom nozzles at 0.40 Dand 0.45 D(hearth diameter)concentric circles is the reasonable solution.The combined blowing steelmaking technique of 300tconverter has been developed through experiments and studies relating to optimizing the topbottom combined blowing pattern,the number and configuration of the bottom nozzles,the type selection of bottom nozzle,and bottom nozzle maintenance techniques.The results show that the product of w[C] ·w[O]at endpoint is reduced from 0.002 62to 0.002 43,average TFe content is decreased by 2%,phosphorus distribution is raised from 70.85to 78.95,sulfur distribution is raised from 3.43to 4.32and manganese content is raised by 0.02%.
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