Abstract: 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.

摘要： 当临氢用12Cr2Mo1R钢采用转炉+LF脱磷工艺时,转炉终点控制[P]<0.010%,[O]>0.06%,LF平均脱磷率73%。通过LF扒渣后钢水平均返磷率为28%,中间包[P]稳定控制在0.005%以下,较"留渣+双渣"工艺平均[P]降低了0.001%,吨钢生产成本降低了约30元,磷的控制不再是生产和低磷钢品种升级的限制性环节。