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In order to study the formation processes of deoxidation products with manganese during the solidification of iron, inclusions in iron ingots, which were deoxidized with 2% manganese or with 0.2% silicon-2% manganese in an alumina crucible and solidified unidirectionally, were investigated. Almost all the deoxidation products in all the ingots deoxidized with both kinds of deoxidizers, were of nearly spherical shape, and usually contained aluminum and silicon besides manganese, oxygen and sulfur. The oxygen content of the ingot did not vary significantly with the kind of the above two deoxidizers. From such experimental results and the estimation of the supersaturation for the formation of some kinds of deoxidation products, it was considered that the deoxidation products with manganese during the solidification of iron in the alumina crucible had nucleated as MnO•Al2O3(s) and grown in liquid state, reacting with Mn, Si, S and O.

Inclusions in Iron Ingots Deoxidized with Manganese or Silicon-Manganese in an Alumina Crucible and Solidified Unidirectionally