Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

E. M. Golubchik, Dr. Eng., Prof., M. I. Boyarshinov Dept. of Materials Forming, Associate Prof., e-mail: e.golubchik@magtu.ru
M. A. Polyakova, Dr. Eng., Prof., M. I. Boyarshinov Dept. of Materials Forming, Associate Prof., e-mail: m.polyakova@magtu.ru
A. V. Markevich, Cand. Eng., Associate Prof., Dept. of Casting Processes and Materials Science, e-mail: artemiy.markevich@bk.ru

Current metallurgical production is characterized by a wide range of manufactured products. The production process at a metallurgical plant is organized so that the billets obtained in the early stages of the process cycle serve as semi-finished material for subsequent stages of finished article production. This production organization requires the use of specialized approaches to designing process modes to ensure the required level of properties and quality indicators for the semi-finished material at all stages of the complete metal production cycle. Rolled steel products are produced sequentially through hot and then cold rolling mills. The same type of hot-rolled steel can serve as semi-finished material for the production of steel strip for various applications. Therefore, the hot-rolling stage must ensure the properties and microstructure of the hot-rolled product are such that the finished steel strip meets the specified quality standards. Hot-rolling modes are highly variable, allowing them to be adapted to subsequent cold-rolling modes. This article examines options for adapting the quality parameters of the initial billet to control the properties of hot-rolled coiled stock made of grades 50 and 65G steel and low-alloy grades 30G2 and 35G2 steel to ensure the required microstructure. It is shown that adapting hot rolling conditions involves regulating surface cooling in the interstand spaces and on the discharge roller table, taking into account the thickness of the hot-rolled product, or regulating the temperatures at the end of rolling and coiling the strip, as well as the deformation modes of roughing and finishing hot rolling within narrow ranges, taking into account the specific chemical composition of the steel.

1. Golubchik E. M. Development of methodological foundations for adaptive quality control of metal products in multivariate technological systems: Dissertation … of Doctor of Engineering Sciences. Magnitogorsk, 2014. 417 p.
2. Kunitsyn G. A., Smirnov P. N., Golubchik E. M., Avdonin N. V. Regulation of transverse thickness variation of the strip during cold rolling on a continuous mill. Stal. 2008. No. 7. pp. 68–70.
3. Smirnov P. N., Kunitsyn G. A., Golubchik E. M. Operational control of transverse thickness variation in the process of cold rolling of high-strength steel strip. Stal. 2009. No. 10. pp. 58–60.
4. Kunitsyn G. A., Golubchik E. M., Smirnov P. N. Features of the production of cold-rolled strip from hot-rolled rolled stock of multiple widths. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2007. No. 2. pp. 46–48.
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6. Salganik V. M., Poletskov P. P. Improving the application of the quarto roller system in sheet rolling under conditions of asymmetric impacts. Proizvostvo prokata. 2004. No. 6. pp. 8–14.
7. Poletskov P. P. Systematization of the process of forming of shape and planeness of thin sheet steel at Magnitogorsk Integrated Metallurgical Works. Chernye Metally. 2011. No. S6. pp. 43–46.
8. Pimenov V. A., Blyumin S. L., Larina Yu. A. Formation of assembly lots on a wide-strip hot rolling mill based on the criterion of minimizing the “flatness” defect. Proizvostvo prokata. 2003. No. 1. pp. 7–10.
9. Chernov P. P., Dolmatov A. P., Milovanov A. A., Ryndin V. A., Shamrin A. V. On the influence of distortion of the transverse profile of rolled products of electrical and carbon steel grades and wear of rolls during hot rolling on the sorting of cold-rolled annealed strips. Proizvostvo prokata. 2004. No. 1. pp. 11–23.
10. Degner M. Development trends in the field of hot and cold rolling of flat and long products. Chernye Metally. 2007. No. 3. pp. 42–43.
11. Koynov T. Dynamics of formation of longitudinal thickness variations and methods for increasing the accuracy of hot-rolled strip during rolling. Proizvostvo prokata. 2005. No. 2. pp. 2–5.
12. Denisov S. V., Smirnov P. N., Golubchik E. M., Kuznetsov V. G., Galkin V. V. Method of production of the wide hot-rolled steel strips. Patent RF, No. 2277129. Applied: 29.11.2004. Published: 27.05.2006. Bulletin No. 15.
13. Denisov S. V., Smirnov P. N., Golubchik E. M., Kuznetsov V. G., Posazhennikov G. N. Method of the production of the wide hot-rolled strips made out of the high-carbon steel grades. Patent RF, No. 2277128. Applied: 29.11.2004. Published: 27.05.2006. Bulletin No. 15.
14. Denisov S. V., Smirnov P. N., Golubchik E. M., Kuznetsov V. G., Galkin V. V. Strip hot rolling method. Patent RF, No. 2288051. Applied: 30.05.2005. Published: 27.11.2006. Bulletin No. 33.
15. Denisov S. V., Smirnov P. N., Golubchik E. M., Torokhtiy V. P. Manufacturing method of broad hot-rolled strips. Patent RF, No. 2356657. Applied: 16.07.2007. Published: 27.05.2009. Bulletin No. 15.
16. Golubchik E. M., Chikishev D. N. Development of a new indicator for assessing the quality of rolled metal products for enameling and methods for its determination. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2022. Vol. 20. No. 4 (42). pp. 95-101.
17. Chikishev D. N., Golubchik E. M., Nikitenko O. A., Shiryaeva E. N., Kolyada T. V. Implementation of new approaches to the production of high-quality rolled metal products for enameling. Byulleten nauchno-tekhnicheskoy i ekonomicheskoy informatsii. Chernaya metallurgiya. 2022. Vol. 78. No. 1. pp. 46–52.
18. Golubchik E. M., Chikishev D. N., Nikitenko O. A. Development of new approaches to improve the technology for production of high-quality rolled metal for enameling. Chernye Metally. 2023. No. 5. pp. 3135.
19. Vasiliev I. S., Golubchik E. M., Kurban V. V., Kuznetsov A. V., Semenov P. P. Method to produce hot-rolled coiled stock of low-alloyed steel. Patent RF, No. 2450061. Applied: 20.01.2011. Published: 10.05.2012. Bulletin No. 13.
20. Denisov S. V., Smirnov P. N., Golubchik E. M., Torokhtiy V. P. Production method of hot-rolled steel reels. Patent RF, No. 2351413. Applied: 27.08.2007. Published: 10.04.2009. Bulletin No. 10.
21. Golubchik E. M., Vasiliev I. S., Kuznetsov A. V., Stekanov P. A. Method of producing hot-rolled low-alloy steel reels. Patent RF, No. 2455088. Applied: 07.10.2010. Published: 20.04.2012. Bulletin No. 11.
22. Golubchik E. M., Gorbunov A. V., Shpak A. I., Galkin V. V., Kryukova N. V. Method of strip coldrolling from low-alloy steel of strength class 220. Patent RF, No. 2452778. Applied: 15.04.2011. Published: 10.06.2012. Bulletin No. 14.
23. Golubchik E. M., Gorbunov A. V., Shpak A. I., Galkin V. V., Kryukova N. V. Method of strip coldrolling from low-alloy steel of strength class 260. Patent RF, No. 2432404. Applied: 05.04.2010. Published: 27.10.2011. Bulletin No. 30.
24. Denisov S. V., Smirnov P. N., Golubchik E. M., Kazakov I. V. Method for production of hot-rolled semi-finished rolled products on continuous broad-strip rolling mill with two groups of reels. Patent RF, No. 2343018. Applied: 26.12.2006. Published: 10.01.2009. Bulletin No. 1.
25. Denisov S. V., Smirnov P. N., Kuznetsov V. G., Golubchik E. M., Kazakov O. V. Hot-rolled etched strip producing method. Patent RF, No. 2296634. Applied: 29.09.2005. Published: 10.04.2007. Bulletin No. 10.
26. Denisov S. V., Smirnov P. N., Kuznetsov V. G., Golubchik E. M., Kazakov O. V. Hot rolling method of low alloy steel in continuous wide strip rolling mill with two groups of coilers. Patent RF, No. 2312720. Applied: 26.10.2005. Published: 20.12.2007. Bulletin No. 35.
27. Denisov S. V., Smirnov P. N., Kuznetsov V. G., Golubchik E. M., Laskov S. A. Method for making hot rolled hot zinc-plated strip. Patent RF, No. 2310528. Applied: 26.10.2005. Published: 20.11.2007. Bulletin No. 32.