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Continuous casting and foundry production
ArticleName The influence of steel chemical composition on structural features of a continuously cast billet with a diameter of 410 mm
ArticleAuthor M. Yu. Chubukov, D. V. Rutsky, N. А. Zyuban, M. V. Kirilichev

Volgograd State Technical University (Volgograd, Russia):

M. Yu. Chubukov, Post-graduate
D. V. Rutskiy, Cand. Eng., Associate Prof.
N. A. Zyuban, Dr. Eng., Prof., Head of the Chair “Technology of Materials”, e-mail:
M. V. Kirilichev, Post-graduate


The research of the structure of continuous-cast billets made of preperitectic and peritectic steel classes with different content of alloying elements is presented. Differences in the structure and development of structural zones are shown. It has been shown that the pre-peritectic class 06ГФБА steel has the greatest intensive heat removal zone (1.5–2.0 times) length, while the size of the crystals it consists of is minimal and does not exceed 10 mm. As the grade carbon content in steel increases, the parameters under consideration change. For 13ГФА steel (C = 0.14%), the length of intensive heat removal zone is reduced and does not exceed 17 mm, thus the crystallite size increases to 30 mm. The density of the dendritic axes is maximum for 06ГФБА steel and minimum for 13 ГФА steel. The greater development of intensive heat removal zone leads to a more uniform and, accordingly, favorable distribution of non-metallic inclusions, over the cross section of continuously cast billets from steel 06ГФБА. The absence of peritectic transformation during hardening, a decrease in the hardening interval, an increase in the development of zones of intensive heat removal favorably affect a decrease in the degree of segregation and, consequently, contributes to obtaining a continuously cast billet with a uniform distribution of chemical elements and lower segregation level.
This work has been supported by the Russian Foundation for Basic Research, project No. 18-08-00050

keywords Solidification, continuously cast billet, cast structure, crystal size, dendritic parameter, non-metallic inclusions

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