Abstract：In order to resolve the strand break caused by P segregation of cord steel and according to the existing equipment and production organization, the double- slag dephosphorization technology test of 120 t converter was conducted, the feeding system, the oxygen operation and the bottom blowing operation of the BOF steelmaking process were studied and the influences of semi steel temperature, basicity, oxide on dephosphorization were analyzed. The test results showed the optimal process condition for dephosphorization was the end of dephosphorization rate increased to 92.8% on the condition of the deslagging temperature of 1 320- 1 400 ℃ and the slag basicity of 1.8- 2.0 in the early stage of converter. At the same time, the average tapping P mass fraction decreased from 0.011% to 0.008 5%, and the average endpoint C mass fraction increased from 0.13% to 0.205%.
2018, Vol. 28 
