Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

D. Yu. Alekseev, Engineer of the Engineering Center of the Scientific-Innovation Sector
A. E. Gulin, Cand. Eng., Associate Professor, Dept. of Materials Processing Technologies, Junior Scientific Employee of the Engineering Center of the Scientific-Innovation Sector, e-mail: a.gulin@magtu.ru
D. G. Emaleeva, Cand. Eng., Associate Professor, Dept. of Materials Processing Technologies, Junior Scientific Employee of the Engineering Center of the Scientific-Innovation Sector, e-mail: emaleevadg@mail.ru
A. S. Kuznetsova, Junior Scientific Employee of the Engineering Center of the Scientific-Innovation Sector, Senior Lecturer, Dept. of Materials Processing Technologies

A finite element model has been developed in the Deform-3D software package for calculating the thermal field of low-alloy steel coil rolled products during rolling in the finishing group of stands and cooling on the discharge roller table of the 2000 wide-strip hot rolling mill of PJSC Magnitogorsk Iron and Steel Works (PJSC MMK). The proposed model takes into account heat release during plastic deformation, cooling of the strip due to metal contact with air, heat transfer to the work rolls, cooling of the strip by water supplied in the process of interstand cooling and in the accelerated cooling unit on the discharge roller table. At the same time, the features of cooling by both upper and lower collectors are taken into account. To achieve the required coiling temperature, the possibility of differentiated activation of collectors of the upper and lower sections of the accelerated cooling unit was implemented, which was introduced into the finite element model. Cooling by water jets was updated by dividing the contact of the cooled strip with water into two zones - the area of water impact with the sheet surface and the area of film boiling. As a result of the analysis of the thermal state of the sheet, an assessment was made of the nature of its change depending on the characteristics of each stage of thermomechanical treatment (TMT). The use of the presented model in the development of TMT technological modes makes it possible to evaluate their correctness, as well as to provide the possibility of predicting the structure and properties formed over the thickness of rolled steel in the process of controlled rolling with accelerated cooling.
P. P. Poletskov, S. V. Denisov, P. A. Stekanov, E. V. Braichev, and P. G. Adishchev, post-graduate student of the MTa-21-2 group, took part in the work.
The work was carried out at the Nosov Magnitogorsk State Technical University with the financial support of the Ministry of Education and Science of Russia as part of the implementation of a comprehensive project to create high-tech production (Agreement with the Ministry of Education and Science of Russia No. 075-11-2021-063 dated 06/25/2021).

1. Bernshtein М. L., Zaimovskiy V. А., Kaputkina L. М. Thermomechanical processing of steel. Moscow: Metallurgiya, 1983. 480 p.
2. Pickering F. B. High strength, low allow steels a decade of progress. New York: Union Carbide Corporation, 1977. pp. 9–31.
3. Makarov Е. V. Research and development of hot strip rolling modes using forced cooling systems: Dissertation … of Candidate of Engineering Sciences. Moscow: NUST «MISiS», 2012. 23 p.
4. Nenakhov V. А. Increasing the efficiency of hot-rolled strip production by optimizing the rolling production program: Dissertation … of Candidate of Engineering Sciences. Lipetsk: Lipetsk State Technical University, 2007. 9 p.
5. Podkustov V. P., Alekseev P. L. Determination of the temperature field of rolled products. Izvestiya vuzov. Chernaya metallurgiya. 1999. No. 9. pp. 40–42.
6. Tkalich К. N., Goncharov N. V., Brittov N. А. Change in the temperature field of the slab during rolling. Stal. 1977. No. 1. pp. 52–55.
7. Redr М., Przhigoda М., Toman Z. et. al. Determination of the temperature field of rolled products during rolling on a four-high mill. Izvestiya vuzov. Chernaya metallurgiya. 1979. No. 5. pp. 56–60.
8. Nanba S., Kitamura M., Shimada M. et al. Prediction of microstructure distribution in the trough-thickness direction during and after hot rolling in carbon steels. ISIJ International. 1992. Vol. 32, Iss. 3. pp. 377–386.
9. Kwak W. J., Kim Y. H., Park H. D. et al. Fe-based on-line model for the prediction of roll force and roll power in hot strip rolling. ISIJ International. 2000. Vol. 40. No. 10. pp. 1013–1018.
10. Yanagimoto J., Ito T., Liu J. FE-based analysis for the microstructure evolution in hot bar rolling. ISIJ International. 2000. Vol. 40, Iss. 1. pp. 65–70.
11. Poletskov P. P., Kuznetsova A. S., Nikitenko O. A., Alekseev D. Y. The study of influence of heat treatment procedures on structure and properties of the new high-strength steel with increased cold resistance. CIS Iron and Steel Review. 2020. Vol. 20. pp. 50–54.
12. Konstantinov D. V., Bzowski K., Korchunov A. G., Kuznetsova A. S., Shiryaev О. Multiscale computer simulation of metastable steel rod drawing by using statistical representation of microstructure. METAL 2017 – 26^th International Conference on Metallurgy and Materials METAL. 2017. pp. 863–868.
13. Konstantinov D., Korchunov A., Emaleeva D., Chukin M., Shiryaev O.P. Microstructure-based computer simulation of pearlitic steel wire drawing. METAL 2017 – 26^th International Conference on Metallurgy and Materials, Conference Proceedings. 2017. pp. 642–647.
14. Konstantinov D., Korchunov A. Multiscale simulation of cold axisymmetric deformation processes. Key Engineering Materials. 2016. Vol. 685. pp. 18–22.
15. Korchunov A. G., Konstantinov D. V., Polyakova M. A., Dabalá M. Mechanical properties of prestressing strands and how they tend to change under thermo-mechanical treatment. CIS Iron and Steel Review. 2019. Vol. 18. pp. 14–19.
16. Poletskov P. P., Alekseev D. Yu., Kuznetsova А. S., Nikitenko О. А. Analysis of the technical requirements to semi-finished rolled products for coil tubing. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2020. Vol. 18. No. 1. pp. 49–54.
17. Poletskov P. P., Nikitenko O. A., Kuznetsova A. S., Alekseev D. Y. Development of heat treatment modes for novel structural sparingly alloyed high-strength steel for arctic and far north applications. Metal Science and Heat Treatment. 2021. Vol. 63. No. 3–4. pp. 171–177.
18. Poletskov P. P., Nikitenko O. A., Kuznetsova A. S., Salganik V. M. The study of transformation kinetics for overcooled austenite of the new high-strength steel with increased cold resistance. CIS Iron and Steel Review. 2020. Vol. 19. pp. 56–59.
19. Welty J. R., Wicks C. E., Wilson R. E., Rorrer G. L. Fundamental of momentum, heat and mass transfer, 5^th edition. New York: John Wiley and Sons, 2007. 729 p.
20. Sokolov S. F., Ogoltsov А. А., Sokolov D. F., Vasilyev А. А. Mathematical model for calculating the temperature of the strip during hot rolling at the PJS Severstal`s 2000 mill. Stal. 2017. No. 2. pp. 35–41.
21. Panjkovic V. Model for prediction of strip temperature in hot strip steel mill. Applied Thermal Engineering. 2007. Vol. 27. pp. 2404–2414.
22. Wells M. A., Militzer M., Prodanovic V. Heat transfer during run-out table cooling — effect of jet configuration. Detroit: Proceeding of the MST’2007 Conference, 2007. 10 p.