中间包通道式过滤器对硅钢W470中夹杂物的影响

利用小样电解+ASPEX扫描电镜等夹杂物检测方法，研究了使用中间包通道式过滤器前后的冲击区和浇注区的钢液以及铸坯中非金属夹杂物类型和尺寸的变化规律。结果表明,使用过滤器后，浸入式水口基本未 堵塞;过滤器对夹杂物尺寸大于30以上的夹杂物颗粒有良好的去除效果;从夹杂物总数来看，冲击区〉铸坯〉浇注区，这是因为浇注区钢水夹杂物有一部分上浮和被过滤器吸附，且浇注区的A1₂O₃单位面积数量较冲击区有显著减少,说明过滤器Al₂O₃对系列夹杂去除效果较好;绝大多数夹杂物尺寸分布在10um以下，使用过滤器后，浇注区钢水单位面积夹杂物数量较冲击区夹杂物数量减少23.3% 。中间包合理工艺参数为:通钢量5.38 t/min、过滤器与长水口距离为1200 mm。

Influence of Tundish Channel Filter on Inclusions in Silicon Steel W470

The inclusion detection methods such as sample electrolysis and ASPEX scanning electron microscope were used, the change law of type and size of nonmetallic inclusions in molten steel and cast slab of impact zone and pouring zone before and after using tundish channel filter has been studied. The results show that the submerged nozzle is not blocked after using the filter；the filter has good removal effect on inclusion particles larger than 30um. In terms of total number of inclusions ,the impact zone inclusions > billet inclusions ; the pouring zone inclusions,this is because the molten steel partial inclusions in pouring zone float up and absorb by the filter, and the Al₂0₃ number of unit area in the pouring zone is significantly reduced compared with the impact zone, indicating that the filter has best removal effect on Al₂0₃ series inclusions ； the size distribution of most inclusions is below 10um. After using the filter, the number of inclusions per unit area in the pouring zone is less than that in the impact zone by 23. 3%. Reasonable process parameters of tundish: molten steel flow rate 5.38 t/min,and distance between filter and long nozzle is 1200 mm.