材料期刊网

利用自行设计的实验装置研究了电磁出钢装置中上水口填充Fe-C合金时, 在承装钢水后Fe-C合金的状态. 实验结果表明, 在上水口处Fe-C合金自上而下将形成液态Fe-C合金、凝固的Fe-C合金、液态烧结的Fe-C合金、固态烧结的Fe-C合金和原始松散的Fe-C合金等5层. 凝固层、液态烧结层和固态烧结层可以在上水口中形成阻挡钢液下流的阻挡层, 防止钢液对滑板进行侵蚀, Fe-C合金所形成的阻挡层在感应加热的作用下可以全部或部分熔化来完成钢包出钢. 在此基础上, 发现钢包承装钢水后 Fe-C合金熔化高度随时间的增加呈现先增大后保持不变的变化趋势, 当钢液的温度降低时,  Fe-C合金熔化高度会减小, 并在相应的平衡位置保持不变. 通过调节Fe-C合金成分可以调节Fe-C合金固/液界面位置, 为电磁出钢系统的线圈布置、结构优化和技术开发提供参考.

A new method (electromagnetic steel-teeming method) using electromagnetic induction heating in slide-gate was proposed to overcome the disadvantage of the pollution of the traditional nozzle sand on the molten steel. The basic idea of this new process is to melt part or whole of the new ladle well-packing material (i.e. Fe-C alloy with similar composition of the molten steel), which becomes the substitute of the traditional nozzle sand, and achieve smoothly molten steel-teeming. In the experiment, the state of the Fe-C alloy well-packed in the upper nozzle was examined when the ladle held molten steel using the self-designed electromagnetic steel-teeming simulation facility. The results showed that the F-C alloy in the upper nozzle were divided into liquid Fe-C alloy, solidified Fe-C alloy, liquid-sintered, solid-sintered and original layers. The solidified, liquid-sintered and solid-sintered layers could prevent the molten steel flow into the upper nozzle from destroing the slide plate. The blocking layers could be melted with induction heating to achieve electromagnetic steel-teeming. In addition, the position of the liquid/solid interface of the Fe-C alloy in the upper nozzle was investigated. The length of liquid Fe-C alloy increased with the increase of time after molten steel poured into the ladle and then kept in a certain length. Furthermore, the position of the interface increased with the increase of melting points which were related to the composition of the Fe-C alloy. The experimental results indicated that 100% automatically teeming of the ladle would be achieved after using the electromagnetic steel-teeming technology.