DOI: 10.52150/2522-9117-2024-38-265-281

Tohobytska Daria Mykolaivna, D. Sc. (Tech.), Professor, Head of Department, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-6413-4823. E-mail: dntog@ukr.net

Belkova Alla Ivanivna, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-8519-9351. E-mail: iro4ka01091990@gmail.com

Stepanenko Dmytro Oleksandrovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-5913-2284

Povorotnia Iryna Romanivna, Ph. D. (Tech.), Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-5872-7403

Grekov Stanislav Viktorovych, Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0003-2849-0999. E-mail: gsv12345679@gmail.com

SELECTION OF CRITERIA AND DEVELOPMENT OF MODELS FOR PREDICTION OF ELEMENTS DISTRIBUTION COEFFICIENTS IN THE “METAL- SLAG” SYSTEM DURING STEEL PROCESSING AT THE LADLE-FURNACE UNIT

Abstract. The main principles of the developed method of forecasting the distribution coefficients of sulfur, silicon, manganese and aluminium between the final products of melting after ladle finishing of steel are presented, based on the concept of directional chemical communication and the analytical apparatus of multidimensional data analysis. An evaluation of the interrelationships of the indicators of the “metal-slag” system before and after proofing the steel with appropriate additives at the ladle-furnace unit was performed according to the SAE1006 steel grades. Reasoned informativeness and application of parameters of interatomic interaction that characterize the chemical composition of steel, slag and additives, and indicators of the technological regime as model parameters of predictive models for calculating the distribution coefficients of the elements of impurity (S, P) and matrix (Mn, Si) subsystems of the metal system at non-furnace processing of steel. The generation of the structure of complex indicators of the “metal-slag” and “metal-additive” systems was carried out, taking into account their chemical composition and physical-chemical properties, using the mathematical apparatus of the generalized Harrington desirability function, which allows various indicators to be “collapsed” into a single generalized indicator. Predictive models were developed for calculating the distribution coefficients of elements using complex indicators in the form of L_el = A · F_ms^α1 · F_md^α2· F_t^α3, where F_ms, F_md, F_t are complex indicators, respectively, of the “metal-slag”, “metal-additive” systems and the technological mode of melting,
A, α₁, α₂, α₃ – coefficients of the equations, which are determined for a specific grade of steel. The proposed approach differs from the traditional methods of considering the distribution coefficients of charge elements as constant values and lays down the prerequisites for the development of an algorithm for forecasting and directed formation of the chemical composition of the final melts, taking into account the initial composition of the metal and slag fed into the ladle, and the selection of the optimal composition of slag mixtures, alloying and microalloying additives.

Key words: “metal-slag” system, parameters of interatomic interaction in melts, distribution coefficients of sulfur, silicon, manganese, and aluminium, complex indicators of “metal-slag” and “metal-additive” systems, desirability function.

DOI: https://doi.org/10.52150/2522-9117-2024-38-265-281

For citation: Tohobytska, D. M., Belkova, A. I., Stepanenko, D. O., Povorotnia, I. R., & Grekov, S. V. (2024). Selection of criteria and development of models for prediction of elements distribution coefficients in the “metal- slag” system during steel processing at the ladle-furnace unit. Fundamental and applied problems of ferrous metallurgy, 38, 265-281. https://doi.org/10.52150/2522-9117-2024-38-265-281

References

Tohobytska, D. M., & Snihura, I. R. (2022). Modeliuvannia metalevykh rozplaviv na rivni mizhatomnoi vzaiemodii. Fundamental and applied problems of ferrous metallurgy, 36, 404-413. https://doi.org/10.52150/2522-9117- 2022-36-404-413
Tohobytska, D. M., Kuksa, O. V., Hrekov, S. V., Povorotnia, I. R., Likhachev, Yu. M., & Khodotova, N. E. (2023). Prohnozuvannia teplofizychnykh vlastyvostei khromovmisnykh ferosplaviv. Fundamental and applied problems of ferrous metallurgy, 37, 287-294. https://doi.org/10.52150/2522-9117-2023-37-287-294.
Togobitska D. & Belkova A. (2024). New approach to evaluating the thermodynamic consistency of melts in the “Metal-Slag” system based on interatomic interaction parameters Lithuanian Journal of Physics, 64(1), 58-71. https://doi.org/10.3952/physics.2024.64.1.6
Togobitska, D., Bielkova, A., & Stepanenko, D. (2023). Model decision-making system in the task of choosing the optimal composition of the blast furnace burden under specific operating conditions of BF. Acta Metallurgica Slovaca, 29(2), 67–74. https://doi.org/10.36547/ams.29.2.1764
Adler, Yu. P., Markova, E. V., & Hranovskyi, Yu. V. (1976). Planirovanie eksperimenta pri poiske optimalnykh uslovii. Nauka