ABSTRACT

In the present study, some steel and slag samples were taken in industry to investigate the effect of slag adjustment on the inclusions in tyre cord steel. The disadvantage of slag adjustment process was discussed in contrast to the process with low basicity slag. The results show that the overall evolution routes of inclusions are the same in both processes with and without slag adjustment. The inclusions transform from MnO–SiO₂ inclusions to CaO–MnO–SiO₂ system inclusions, and even CaO–SiO₂ system inclusions during LF refining process. The adjustment of slag influences the dissolved oxygen in liquid steel evidently, thus impacts the dissolved elements e.g. Ca, Mg, and Al in liquid steel, and the evolution of inclusions. The composition fluctuations of the inclusions caused by slag adjustment increase the risk of non-deformable inclusions. Low slag basicity during the whole refining process is strongly recommended.

摘要

在本研究中，在工业中采集了一些钢和炉渣样品，以研究炉渣调整对轮胎帘子线钢中夹杂物的影响。对比低碱度炉渣工艺，讨论了炉渣调整工艺的缺点。结果表明，有和无渣调整过程中夹杂物的总体演化路线是相同的。在LF精炼过程中夹杂物由MnO-SiO ₂夹杂物转变为CaO-MnO-SiO ₂系夹杂物，甚至CaO-SiO ₂系夹杂物。炉渣的调整对钢液中的溶解氧有明显的影响，从而影响溶解元素，如钢液中的 Ca、Mg、Al 及夹杂物的演化. 夹渣调整引起的夹杂物成分波动增加了不可变形夹杂物的风险。强烈建议在整个精炼过程中保持低渣碱度。