帘线钢精炼与连铸过程中夹杂物的研究

Research on the inclusion during refining and continuous casting process of tire cord steel

对“LD→LF→VD→CC”工艺流程生产帘线钢各工位夹杂物类型、形貌和分布进行了研究。研究结果表明：帘线钢转炉出钢过程中加入帘线钢精炼渣对钢脱硫不利，但为后续精炼预造渣和对钢中夹杂物的变性提供了条件；为了使夹杂物获得良好的塑性，精炼过程中采用中性渣，调渣时禁止使用铝矾土，要求终渣碱度为0．9～1．1；对钢中大型夹杂物的分析发现，多数夹杂物成分为SiO2-Al2O3，部分存在Na2O和K2O，应该是耐火材料卷入造成的。选用优质耐火材料，控制钢水温度、铸坯拉速显得尤为重要。

The type, morphology and distribution of the inclusion in tire cord steel at each operation position of ＂LD→LF→VD→CC＂ production process were investigated. The result shows that it is bad for desulfurization to add refining slag during LD tapping, but it provides conditions for pre-slagging and inclusion modification in the following process. In order to gain a good plasticity of inclusion, neutral slag was used during refining process, it is forbidden to use bauxite at adjusting slag process, and the basicity of final slag was required at 0.9- 1.1. Through analyzing the large inclusion, it can be found that most composition of inclusion is SiO2-Al2O3 and a small portion include NaaO and K2O. It should be involved refractories. Therefore, it is very important to use high quality refractories and control temperture of the molten steel and casting speed.