Abstract: Through thermodynamic calculation and material balance, the total amount of slag that needed for BOF dephosphorization was obtained. Meanwhile, combined with three key elements of BOF dephosphorization, the parameters and measures of BOF steelmaking with less slag were adjusted. The industrial test showed that the total amount of slag was reduced by 11.46 kg/t, oxygen consumption was decreased by 417 m3 per heat, the volume of gas recovery was increased by 57 m3 per heat, and the ferrous charge consumption was declined by 2.08 kg/t on condition that the phosphorus content of steel was kept stable.

Key words: converter steelmaking, gas recovery, ferrous charge consumption, less slag, dephosphorization