基于洁净度控制的IF钢精炼工艺优化

Optimization of Secondary Refining Process for the Cleanness Controlling of IF Steel

摘要: 针对IF (Interstitial Free)钢冷轧板缺陷发生率较高的问题，在历史生产数据分析和工业试验基础上，以钢水洁净度控制为目标，优化了钢包渣改质工艺、确定了合适的RH合金化后钢水净循环时间、钢水静置时间。结果表明，工艺优化后，钢包渣FeO含量可稳定控制在10%以下；钢水洁净度提高明显，全氧含量可以稳定控制在30 ppm以下，平均为24.3 ppm；由Al₂O₃基夹杂物引起的冷轧板缺陷发生率由优化前的平均0.78%降低到优化后的平均0.62%。

Abstract: Focused on the problem of high defect rate of cold rolled plate, based on the analysis of history industrial data and the results of industrial experiments, the modification technology was opti-mized and the circulation time after alloying in RH refining process and the standing time after RH refining were determined to enhance the cleanness of the IF liquid steel. Results showed that, after process optimization, the FeO content in ladle slag can be controlled less than 10% steadily, the total oxygen content in liquid steel can be controlled less than 30 ppm (average content 24.3 ppm). Moreover, the average defect rate of cold rolled plate induced by the Al₂O₃-base inclusion decreased from 0.78% to 0.62%.