By converter + LF dephosphorization process for 12Cr2MolR steel for hydrogen atmosphere the BOF end [P] can be controlled <0.010% and end [O] >0.06%
the average dephosphorization rate of steel in LF is 73% and average rephosphoration rate of steel after slagging is 28%
the tundish [P] can be stably controlled below 0.005%. The average phosphorus content is reduced by 0. 001% compared with the initial retained slag + double slag method
the production cost is reduced by about ¥ 30 /t steel. Phosphorus control is no longer a restricted link in production and upgrading of low phosphorus steel grade.