Abstract: 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.

摘要： 针对转炉终点钢水磷含量高且波动大的问题,对钢水深脱磷控制难点及影响脱磷的因素进行了分析,提出了采用"双渣高拉碳放渣"的深脱磷工艺路线;通过优化造渣制度、供氧和底吹气制度、枪位控制和终点控制等脱磷工艺,9炉34CrMo4钢的冶炼结果表明,钢水脱磷率达84.6%,终点渣-钢磷分配比Lp达到90.1,实现了转炉终点钢水[P]≤0.006%的稳定控制,并通过采用滑板挡渣及顶渣改制等减少回磷的技术措施,具备了批量生产磷含量小于0.010%的低磷钢种的能力。

关键词: 200t顶底复吹转炉, 半钢冶炼, 干法除尘, 转炉脱磷, 工艺实践