Abstract: Since the phosphorus content in hot metal at Shuisteel is up to 0. 104% ~ 0. 157% , the 30^# ~ 80^#, SWRH82B, ER70S-6, SWRCH22A and 40Cr etc high quality steels are melted by 100 t top and bottom combined blown converter using double-slag operation to reduce the phosphorous content in liquid, in this case the metal consumption is 1 054 kg/t and the lime consumption is 32. 4 kg/t. Based on the analysis o£ thermal equilibrium of single-slag process, increasing early slag dephosphorizing ability, optimization of slagging schedule in middle and latter period and oxygen supply schedule, and optimization of furnace capacity ratio, the single-slag deep dephosphorization process for high quality steels is established. The application results show that metal consumption for melting high quality steels decreases to 1047 kg/t, the lime consumption decreases to 29. 4 kg/t, the tapping [C] = 0. 14% ~ 0. 28% and the tapping [P] = 0.014%〜0.020%.

摘要： 由于水钢铁水[P]高达0.104%~0.157%,100 t顶底复吹转炉在冶炼30^#~80^#、SWRH82B、ER70S-6、SWRCH22A、40Cr等优质钢时,采用双渣操作降低钢中磷含量,钢铁料消耗为1 054kg/t,石灰消耗为32.4 kg/t。通过单渣法热平衡,提高初期渣脱磷能力,中、后期造渣制度、供氧制度和炉容比优化的分析,建立了优质钢单渣法深脱磷工艺。应用结果表明,优质钢的钢铁料消耗降低到1 047 kg/t,石灰消耗降低到29.4 kg/t,出钢[C]=0.14%~0.28%,出钢[P]=0.014%~0.020%。

关键词: 100t转炉, 单渣法, 双渣法, 脱磷, 优质钢, 钢铁料消耗