Abstract
In the rimming steel ingots, large inclusions exist characteristically in the bottom part of ingots. The formation of large inclusions is related to the formation of “mushy zone” which grows up from bottom of molten steel in mold during the period of rimming action.“Mushy zone” can be observed macro-scopically at the cross-section of solidified ingot.
The result of investigation of tested ingots under the various conditions indicates that amount of large inclusions in “mushy zone” increases with increase of height of “mushy zone”. Rimming time and height of ingot have an important influence on the growth of“mushy zone” or amount of large inclusions. It is observed that when rimming time becomes longer or ingot becomes higher, both height of “mushy zone” and amount of large inclusions increase.
