Abstract
Results are presented for the systematization of interaction mechanisms between exogenous and endogenous inclusions in the course of steel solidification, as well as the conditions for the formation of coarse inclusions in modern metallurgical complexes. Based on published data and on the results of the author’s studies, it is shown that coarse inclusions are mainly exoendogenous by nature, whereby the conglomerates of inhomogeneous composition are formed during the entire production cycle until a crystallized casting is obtained. The presence of magnesium in nonmetallic inclusions is affected by the process of out-of-furnace treatment with a profound metal and slag deoxidation, as well as by the use of units having a magnesia lining. The erosion of the refractory lining in steel-smelting (and steel teeming) units should be considered as a significant factor in the formation of magnesium-containing inclusions.
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