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针对莱钢用高磷铁水冶炼高碳低磷钢容易出现终点碳过低和终点磷超标的问题,通过将脱磷渣碱度控制在1.5左右,实行双渣留渣工艺,提高前期底吹强度改善动力学条件,使用无氟化渣剂和增上滑板挡渣优化挡渣效果等措施,实现了高磷铁水冶炼低磷钢的高效生产。其中,终点磷质量分数可稳定控制在0.010%以下,脱磷率由89.80%提高到94.67%,终点碳质量分数控制在0.15%以上,钢水氧化性降低,钢包渣厚降低了40mm,精炼成白渣时间减少,满足了高碳低磷钢洁净度的要求,取得了良好的经济效益。
Aiming at the problem of too low end point and excessive end point of phosphorus in Laigang smelting high-phosphorus and low-phosphorus steel with high-phosphorus molten iron, by controlling the basicity of the dephosphorization slag to about 1.5, the double slag- Improve kinetic conditions, the use of non-fluoride slag agent and skateboard slag by increasing the slag effect and other measures to optimize the high-phosphorus molten iron to achieve low-phosphorus steel production. Among them, the end point phosphorus content can be controlled below 0.010%, the dephosphorization rate increased from 89.80% to 94.67%, the end point carbon content above 0.15%, the oxidation of molten steel decreased, the ladle slag thickness reduced by 40mm, Slag time reduced to meet the cleanliness of high-carbon low-phosphorus steel requirements, and achieved good economic benefits.