Abstract: This paper studied the cause and the improvement measures of common defects in Fe-Cr-Al alloy ingots smelted by 150kg VIM furnace. Through four experiments, the influence of pouring temperature, pouring time, the lining use times and whether the tundish used a filter are studied on the surface quality and the internal shrinkage. The results show that the surface quality of the ingot is better and there is no shrinkage cavity defect under the condition that the pouring temperature is 1640 ℃, the pouring time is 0.56 min, the lining is used less and the tundish uses the filter.

Key words: VIM, Fe-Cr-Al alloy, defect, measures