According to the issue of high phosphorus content in liquid with great fluctuation at end-point of converter

the difficult points for control of deep dephosphorization of liquid and the influence factors on dephosphorization are analyzed

and to use the deep dephosphorization process scheme of “double slagging catch carbon method” is proposed. With the dephosphorization measures including optimizing slagging

oxygen supplying

bottom gas blowing and lance level and end point control

the results of 9 heats of steel 34CrMo4 steelmaking shows that the dephosphorization rate of liquid is up to 84.6%

the end slag-steel phosphor partition ratio Lp is up to 90.1 to realize the stable control on converter liquid end [P]≤0.006%

and with using the technology measures of skateboard and reformed top slag to reduce rephosphorization

the ability of batch steelmaking low phosphorus steel with phosphorus content less than 0. 010% is qualified.