Browsing by Author "Zotov, Dmytro"

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Characterization of Thermophysical Properties and Crystallization Behavior of Industrial Mold Fluxes
(MDPI, Basel, Switzerland, 2025) Bellé, Matheus Roberto; Yehorov, Anton; Chebykin, Dmitry; Zotov, Dmytro; Volkova, Olena
ENG: This study explores the thermophysical properties and crystallization behavior of two industrial Mold Fluxes (MF1 and MF2) used in continuous steel casting. Viscosity, density, and surface tension were measured using the Rotating Bob Viscometry (RBV) and the Maximum Bubble Pressure (MBP) method, while crystallization dynamics were assessed via the Single Hot Thermocouple Technique (SHTT). Both fluxes showed temperature-dependent viscosity with distinct break temperatures influenced by chemical composition. MF1 had higher viscosity and activation energy (127.72 kJ mol−1) than MF2 (112.11 kJ mol−1) due to its higher Al2O3 content. Density and surface tension decreased linearly from 1523 to 1623 K, with values of 2642–2618 kg m−3 and 299–291 mN m−1 for MF1, and 2708–2656 kg m−3 and 348–305 mN m−1 for MF2. Crystallization analysis showed that MF1 required higher cooling rates (critical cooling rates: 21 K s−1 vs. 18 K s−1 for MF2) for glass formation, highlighting its greater glass-former content.
Improving the Cleanness of Low-Carbon Tube Steel Under Steel Plant Conditions
(John Wiley & Sons Ltd., 2026) Zotov, Dmytro; Niziaiev, Kostiantyn H.; Uzlov, Oleg; Puchykov, Oleksandr
ENG: Reducing the number of nonmetallic inclusions in high-quality steel rolled products is of great importance for all steel plants. One of the ways to decrease the size and quantity of alumina and silicate nonmetallic inclusions could be suppressing their formation during steel tapping from the BOF converter to the ladle. This could be achieved by changing part of the aluminum for alternative deoxidizers which do not remain in crude steel. Steel deoxidation with the help of calcium and carbon compounds may allow for a drastic decrease in the quantity of alumina nonmetallic inclusions because of the positive effect on their solubility in liquid steel as well as redundant oxygen removal as a gas in CO and CO2 compounds. Another way to eliminate endogenous Al and Si inclusions is to create favorable thermodynamic conditions to maximize the transfer of nonmetallic inclusions into slag during subsequent ladle furnace treatment. Establishing an optimum range of slag basicity may allow to suppress the harmful spinel inclusions. The effect of calcium carbide preliminary deoxidation during pouring of the semifinished product from BOF converter on the content of nonmetallic inclusions in flat-rolled product has been analyzed. It has been shown that partial replacement of aluminum with calcium carbide during deoxidation of crude steel by BOF tapping together with liquid slag basicity control during ladle furnace treatment allows to reduce content of nonmetallic inclusions in low-carbon steel.
Phosphorus Partition in an Industrial Basic Oxygen Furnace Process in Ukraine
(Wiley-VCH GmbH, Weinheim, 2024) Volkova, Olena; Tinkova, Nataliia; Onaa, Rapuruchukwu Ifeyinwa; Neubert, Lukas; Niziaiev, Kostiantyn H.; Zotov, Dmytro
ENG: Phosphorus partition data from Ukrainian integrated steel plants are analyzed, focusing on the influence of parameters such as the basicity (CaO/SiO2), optical basicity, tapping temperature, and the contents of (FeO), (MgO), and (Al2O3) in the slag. It is found that the phosphorus partition decreases with increase in tapping temperature and increases with the optical basicity. An increase in the phosphorus partition (P)/[P] followed by a decrease with increase of (CaO/SiO2) are observed. It is found that the optimal value, break point at which phosphorus partition changes its dependence to opposite, has a direct dependence on tapping temperature. At (CaO/SiO2) = 1.9–2.1, (P)/[P] increases linearly with increasing (FeO). However with higher value of (CaO/SiO2) the breaking point when (P)/[P] starts to decrease with increase in (FeO) is noticed. Thereby the optimal value of (FeO) decreases with increasing tapping temperature. In case of (Al2O3) there is only decreasing of (P)/[P] with all (CaO/SiO2) and tapping temperatures. Moreover, the effect of (MgO) varies with (CaO/SiO2). These industrial results are supported by thermodynamic simulations using FactSage 8.1 and aligned with existing results from the literature.