Based on theoretical analysis on dephosphorization in steelmaking process
the off-gas analysis is used to control steel melting process and end-point temperature of molten steel
control slag melting process
forecast end-point phosphorus content in steel and get low phosphorus molten steel. For 100 t top and bottom combined blown converter at Shouqin Metal Materials Co Ltd
the silicon content in hot metal is 0. 2% ~ 0. 8% and the phosphorus content is 0. 052% ~ 0. 090%
the pipeline steel production results show that by off-gas analysis the percentage of hits for end-point temperature of molten steel (1 580 ~ 1 650 ℃)is more than 95%
and the forecasting by model and the measuring BOF end-point phosphorus content are respectively 0.007 6% and 0.007 4%. The aim of BOF end-point phosphorus content ≤ 0. 010% is realized by off-gas analysis.