Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

S. A. Levandovskiy, Cand. Eng., Associate Prof., Materials Processing Dept., E-mail: levandovskiy@mail.ru
G. K. Rozhkov, Mag. Student., Materials Processing Dept.
A. B. Moller, Dr. Eng., Prof., Head of Materials Processing Dept.
O. N. Tulupov, Dr. Eng., Prof., Materials Processing Dept.

There are modern conditions for the development of the metallurgical sector of the economy with some new features. The paper provides an overview of the state of modern mini-mills, their extended classification is given. As an example, an approach to formation of new and the development of existing mini-mills for the production of metal using recycled materials is given. The technology of rerolling of used rails into a square billet, reinforced bars and grinding balls is considered. The resulting production line is characterized as highly environmental friendly equipment: electric energy from a hydroelectric power station is used as the main source, secondary scrap remelting technology is not used, production wastes are minimized and secondary metallurgical raw materials are consumed.

1. Danieli Innovaction meeting. Strategies for managing successfully during “new normal”. Danieli News. 2018. January. No. 177. pp. 6–7.
2. Danieli undisputed leadership in mini-mill technology. Danieli News. 2016. March. No. 173. pp. 18–37.
3. Lincoln R. E., Wilson, P. B., Hunt H. D. Chaparral steel. 15 years of innovative steelmaking. Ironmaking and Steelmaking. 1990. Vol. 17, Iss. 3. pp 193–196.
4. Smirnov A. N., Safonov V. M., Dorokhova L. V., Tsuprin A. Yu. Metallurgical mini-mills. Donetsk : Nord-Press. 2005. Vol. 1. 2005. 469 p.
5. Alzetta F., Großmann E., Schröder J. Latest breakthrough technologies in industrial operation. Stahl und Eisen. 2011. Vol. 131. No. 11. pp. 92–108
6. Soifer V. M. Use of DRI products in electric steelmaking furnaces. Vestnik Kharkovskogo natsionalnogo avtomobilno-dorozhnogo universiteta. 2006. No. 33. pp. 32–34.
7. Rozhkov G. K., Levandovskiy S. A., Sarancha S. Yu., Moller A. B., Kinzin D. I., Tulupov O. N. Development of up-to-date resource-saving production technology for reinforced bars and grinding balls. Modelirovanie i razvitie protsessov OMD. 2019. No. 3(30). pp. 18–22.
8. Rozhkov G. K., Levandovskiy S. A. Development of the minimills concept for manufacture of rolled steel products. Kalibrovochnoe byuro. 2018. No 12. pp. 5–9.
9. Rail market review in Russia and other CIS countries. The report of “Infomine” research group. Moscow. 2015. 125 p.
10. Bakhtiniov Yu. B. On expedience of rerolling of worn rails in sections. Proizvodstvo prokata. 2000. No. 7. pp. 2–4.
11. Umanskiy A. A., Dorofeev V. V., Golovatenko A. V., Dobryanskiy A. V. Development and improvement of modes of rolling of asymmetric rail profiles on the modern universal rolling mill. Chernye metally. 2018. No. 10. pp. 38–42.
12. Golovatenko A. V., Dorofeev V. V., Dobryanskiy A. V., Pervushin D. E. Development of energy efficient rolling technology for long-length rails at the universal rail and structural mill of JSC “EVRAZ ZSMK”. Chernye metally. 2019. No. 6. pp. 29–34.
13. MI.DA. ESC-Energy Saving Compact plants [Web resource]. URL: https://www.danieli.com/en/products/processes-technologies/product-lines/mi-da-esc-energy-saving-compactplants_26_188.htm (access date: 13.04.2020).
14. Smirnov V. K., Shilov V. A., Mikhailenko A. M. Et al. Processing technology of railroad rails to rolled sections. Stal. 1995. No. 2. pp. 46–48.
15. Badyuk S. I., Leshchenko A. I. Production of rolled sections from worn railroad rails. Obrabotka metallov davleniem. 2010. No. 4. pp. 162–167.
16. RF Patent RU 2541211 C2, МПК В21В1/08. Matlashov A. M. The method of fabrication of rolled sections from rail fragments. Byulleten izobreteniy. 2014. No. 10.
17. RF Patent RU 2491139 МПК В21В1/08. Volshonok I. Z., Traino A. I., Ivanov D. M., Rusakov A. D., Ryzhik M. P. The method of shape rolled sections production. Declarant and Patent-owner: National University of Science and Technology “MISiS”. Byulleten izobreteniy. 2012. No. 24.
18. Levandovsky S. A., Tulupov O. N., Moller A. B., Kinzin D. I. Improvement of the slitting process for rebar rolling to increase the material yield and rolling mill 370 utilization at PJSC “MMK”. CIS Iron and Steel Review. 2018. Vol. 15. pp. 18–23.