This article is aimed to study theoretical knowledges related to deep steel desulfurization and their practical application in specific production conditions. The main goal of this study was to verify the efficiency of added CaSi to processed heats in two batches, i.e., first for deep desulfurization at the beginning of the secondary metallurgy and then in a second smaller batch at the end of that process for final modification. At the beginning of the secondary metallurgy process, it was crucial to prepare a suitable chemical composition of ladle slag with advantageous properties for good assimilation of sulfur-based inclusions from desulfurization reactions. Samples were taken of final basic oxygen furnace slag, ladle slag before the deep desulfurization process at the beginning of secondary metallurgy and ladle slag at the end of processing. Detailed cleanliness analyses of steel samples taken from mold during the casting were performed using the Automated Steel Cleanliness Analyses Tool. For better understanding and interpretation of the obtained cleanliness results and their relationship, the following defined parameters were used: ratio of “Ca/Al” oxide inclusions, percentage of “liquid” inclusions and area of CaS inclusions.

本文旨在研究钢铁深度脱硫相关的理论知识及其在特定生产条件下的实际应用。本研究的主要目的是验证将 CaSi 添加到加工炉中的效率分两批，即首先在二次冶金开始时进行深度脱硫，然后在该过程结束时在第二批较小的批次中进行最终改性. 在二次冶金过程开始时，关键是要制备合适的钢包渣化学成分，该钢包渣具有良好的特性，以良好地同化脱硫反应中的硫基夹杂物。对二次冶金开始深度脱硫前的最终碱性氧气炉渣、钢包渣和处理结束时的钢包渣进行取样。使用自动钢清洁度分析工具对铸造过程中从模具中取出的钢样品进行详细清洁度分析。为了更好地理解和解释获得的清洁度结果及其关系，使用了以下定义的参数：“Ca/Al”氧化物夹杂物的比率、“液体”夹杂物的百分比和 CaS 夹杂物的面积。