I. P. Bardin Central Research Institute of Ferrous Metallurgy (Moscow, Russia)

I. A. Krasnyanskaya*, Cand. Eng., Head of the Laboratory of Complex Chemical Researches, N. P. Lyakishev Scientific Center for Complex Processing of Raw Materials, iakrsn@gmail.com
K. N. Anisimov, Cand. Eng., Head of the Laboratory of Refractory Materials

LLC “Cyberphysics” (Moscow, Russia)
M. P. Gusev, Cand. Eng., Chief Business Development Officer

PAO NLMK (Lipetsk, Russia)
M. G. Moshchenko, Cand. Eng., Head of the Programs, Directorate of Researches and Developments
D. V. Karavaev, Engineer, Directorate of Researches and Developments

* Corresponding author

A. I. Volkov took part in the work

In the production of ultra-low carbon steels, it is especially important to prevent the carburization of the melt. The latter can occur as a result of lining corrosion, when carbon ions transfer from the ladle lining to the melted steel. This process is mainly caused by the corrosive effect of slags on the refractory and is associated with their chemical composition and physical properties, such as viscosity. While many slag-refractory systems are currently used in the steel making, such systems often lack sufficient data for the strict modeling of the interaction process. In this work, we investigate the corrosive behavior of various slags on MgO–C lining in order to minimize the increase in carbon during the dynamo steel production. It is established that the main factor influencing the wear of the lining is its phase composition. Spinel, which forms at the slag-refractory interface, can be washed out from the boundaries of the lining, exposing its internal layers to the slag. However, in the presence of calcium aluminate CaAl4O7 in the remaining melt, the intensive washout of the spinel layers is inhibited. These components act as a protective factor even when MgO content in the slag is relatively low. Thus, by changing the composition of the slag, it is possible to obtain extremely low wear of MgO–C refractories even with small MgO content in the slag and therefore reduce the subsequent carburization of the metal caused by corrosion of the refractories in the slag zone.

This research did not receive any specific grant from funding agencies in the public, commercial, or not-forprofit sectors.

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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