The paper presents the results of operating experiments focused on the study of the formation and modification of non-metallic inclusions during treatment of aluminium-killed steels at units of secondary metallurgy. The process melts were focused on analysis of the influence of deoxidizing and slag-making agents and wear of the lining on the steel microcleanness. The experiments were aimed at studying the patterns of formation, origin and conditions of elimination of non-metallic inclusions during treatment of steels on the homogenization station and ladle furnace. The actual evaluation of microcleanness was executed by means of SEM microscope. The results present the number, ratio and analysis of chemical composition of non-metallic inclusions including their plotting in ternary diagrams. The evaluation indicated in the paper represents basic information on the achieved microcleanness, and thus also the produced steel quality.Keywords: steel, slag, secondary metallurgy, microcleanness, non-metallic inclusions
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