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为了生产超低磷钢,在1600℃用高碱度CaO CaF2 FeO系渣对低磷钢水进行了炉外深脱磷的研究。分析了氧化性和碱度对脱磷效果的影响,确定了合适的渣系组成,测得1600℃下该渣系的磷容量在1018 54～1020 2范围内。实验结果表明:氧化性和碱度是影响脱磷效果的两个制约性因素;在钢水初始磷含量为0 01%左右的条件下,使用该渣获得了大于50%的脱磷率及低于0 005%(最低可达0 0027%)的磷含量;在300t转炉上进行的初步生产试验也获得了50%左右的脱磷率及0 006%左右的成品磷含量。
In order to produce ultra-low phosphorus steel, low phosphorus steel was dephosphorized at 1600 ℃ with high basicity CaO CaF2 FeO system slag. The effects of oxidation and alkalinity on dephosphorization were analyzed, and the appropriate slag composition was determined. The phosphorus content of the slag was measured in the range of 1018 54 ~ 1020 2 at 1600 ℃. The experimental results show that oxidation and alkalinity are the two limiting factors affecting the dephosphorization effect. When the initial phosphorus content of molten steel is about 0.01%, the dephosphorization rate of more than 50% 0 005% (the lowest up to 0 0027%) of phosphorus content; 300t converter on the preliminary production test also got about 50% dephosphorization rate and 0 006% of the finished product phosphorus content.