Abstract
The paper presents the results of identification and features of the distribution of non-metallic inclusions (NMI) along the cross-section of a continuously cast blank (CCB) with a square cross-section of 360x360 mm made of C45E grade steel. Identification of inclusions by optical and electron microscopy showed that three main groups of NMI prevail in the CCB metal: oxides, sulfides and oxysulfides. Oxide inclusions are represented by inclusions of two types (alumagnesial spinel in a shell of calcium aluminate type CaO∙Al2O3, silicates of type 3MnO∙Al2O3∙3SiO2), sulfide inclusions are represented by sulfides MnS and CaS, oxysulfide inclusions (oxides in a shell of sulfides). The distribution of inclusions across the cross-section is uneven, the surface and central layers of the CCB have the maximum contamination. The paper shows that the reason for the increase in the number of inclusions in the center of CCB is caused by an increase in the number of sulfide inclusions (tertiary NMI), the high content of inclusions in the surface layers of CCB, caused by a high content of oxide and oxysulfide inclusions (primary and secondary NMI).
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