Features of the Distribution of Nonmetallic Inclusions in Continuously Cast Billets Made of Sulfur-Containing Steel C45E

• Published in: Steel in translation Vol. 53; no. 11; pp. 1078 - 1082
• Main Authors: Rutskii, D. V., Zyuban, N. A., Kirilichev, M. V., Nikitin, M. S., Chubukov, M. Yu
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-11-2023; Springer Nature B.V
• Subjects: Aluminum oxide; Billets; Calcium aluminate; Chemistry and Materials Science; Continuous casting; Cross-sections; Materials Science; Medium carbon steels; Nonmetallic inclusions; Solidification; Sulfur; Surface layers; oxides; continuous casting; solidification; nonmetallic inclusions; continuous cast billet; oxysulfides; sulfides
• ISSN: 0967-0912; 1935-0988
• DOI: 10.3103/S096709122311027X

The features of the distribution of nonmetallic inclusions (NIs) along the cross-section of the 360 × 360-mm continuous cast billet (CCB) made of C45E steel are considered. Due to the high sulfur content in C45E steel, the proportion of sulfide inclusions is 54% and of oxysulfide inclusions, 35%. NIs are nonuniformly distributed along the CCB cross-section. High content of refractory oxide (refractory calcium aluminates CaO⋅Al
2
O
3
and spinels MgO⋅Al
2
O
3
) and oxysulfide NIs has been found in the surface layer of small differently oriented crystals, which is associated with the formation of oxide inclusions at the stage of melting, in the shell of which CaS/MnS sulfides are formed. Further solidification of the CCB leads to a decrease in the content of oxysulfide inclusions along the cross-section of the billet due to their movement to the axial zone, where the number of sulfide inclusions increases.