超低碳IF钢中夹杂物来源的示踪分析

为了分析超低碳IF钢中夹杂物来源，采用在转炉出钢后及中间包覆盖剂添加示踪剂的方法，确定夹杂物的来源。并在相关工序取钢样或渣样，利用扫描电镜观察分析夹杂物的形貌和成分。研究表明，RH进站顶渣w(TFe)控制为2.54%~4.49%，RH出站顶渣w(TFe)控制为4.56%~5.23%，RH钢包顶渣w(CaO)/w(Al2O3)控制为1.20~1.93，顶渣改质效果良好。正常坯进行分析含有少量的钡，未发现铈元素，在换包时取样第6炉和第7炉中间坯进行分析，可发现含有钡即钢包下渣情况，少量的铈成分。第6炉正常坯w(TO)为0.001 4%，第6炉和第7炉中间坯w(TO)为0.001 6%，第7炉正常坯w(TO)为0.001 5%，可见正常铸坯与交接坯相比w(TO)略有降低。

Analysis of inclusions source in ultra low #br# carbon IF steel by tracer method

In order to analyze the sources of inclusions in ultra low carbon IF steel, the tracer was added after converter tapping and tundish flux to determine the source of inclusions. Steel samples and slag samples were taken in the relevant processes, and the morphology and composition of inclusions were observed and analyzed by SEM. The results showed that when w（TFe） in the top slag were controlled in 2.54% 4.49 % and 4.56% 5.23% for the RH station and RH end, respectively, and the w(CaO)/w(Al2O3) ratio of the RH top slag was controlled in 1.20 1.93, the modification effect of the top slag was good. By analyzing the normal slab, it was found that there was a small amount of Ba and no Ce. The transition slabs between the sixth and seventh heat were analyzed. It was found that there was some Ba and a small amount of Ce. w（TO） of normal slabs in the sixth heat was 0.001 4%, w（TO） of the transition slabs in the sixth and seventh heat was 0.001 6%, w（TO） of the normal slabs in the seventh heat reduced to 0.001 5%, which indicated that w（TO） in the normal slabs was lower than that of the transition slab.