Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

M. I. Rumyantsev, Cand. Eng., Prof., Chair of Materials Processing Technology, e-mail: mikhail.rumyantsev54@bk.ru
A. N. Zavalishchin, Dr. Eng., Prof., Chair of Metallurgy and Casting Technology, e-mail:  zaval1313@mail.ru

Corporate Center of Personnel Training (KZPK) “Personal” (Magnitogorsk, Russia):

V. L. Kornilov, Cand. Eng., Head of the Chair of Metallurgical Production Technology, e-mail: Kornilov.VL@mmk.ru

Despite the growth in consumption of cold-rolled high and extra-high strength steel, so-called soft (Mild) steel, which includes lowcarbon quality grades without the addition of micro-alloying elements, remains in demand. Cold-rolled sheet is made from this steel and intended for the production of products with significant degrees of extraction. The high yield in the production of such products is ensured by the compliance of the hot and cold rolling modes with the chemical composition of the steel, which, for various reasons, may change markedly. It has been established that during melting steel with the content of not more than 0.2% manganese and the low carbon content (0.004–0.02% instead of 0.04–0.06%), the properties corresponding to the CQ, DQ and DDQ quality classes are provided by increasing the temperature of the end of the hot rolling, the temperature of the coiling in a coil and the total reduction during cold rolling. The rational values of the indicated temperatures as well as the thickness of the hot-rolled strip which provide an increase in the total reduction at the maximum performance of the technological system “wide-strip hot rolling mill - two-stand reversing cold rolling mill” have been determined. Mild-steel also enables to increase the resource efficiency of rolling production by replacing cold-rolled products with products of the same purpose and quality, but supplied in the hot-rolled state. The conditions for the production of thin hot-rolled strips in the wide-strip hot-rolling mill, the quality of which corresponds to the quality of general-purpose cold-rolled steel, including hot-dip galvanized, have been determined. It has been established that the price of hot-rolled steel for deliveries instead of cold-rolled for ones general purposes can be set by 20% lower than the price of the products of this range.

1. Blumel К. Prospects of application of steels for car body manufacture. Chernye Metally. No. 10. 1995. pp. 65–71.
2. Meincke A., Mohr L. The eff ect of steel products deliveries on development of automotive industry. Chernye Metally. 2016. No. 4. pp. 52–56.
3. Keeler S., Kimchi M., Mooney P. J. Advanced High-Strength Steels. Application Guidelines. Version 6.0. WorldAutoSteel : April 2017. 314 p. Available at www.worldautosteel.org/downloads/599700/ (accessed: 06.06.2018).
4. Benyakovsky M. A., Maslenikov V. A. Automotive steel and thin sheet. Cherepovets: Izdatelsky dom «Cherepovets». 2007. 636 p.
5. Ivoditov V. A. Automotive steel. Part 2. Proizvodstvo prokata. 2005. No. 1. pp. 37–44.
6. Deep drawing. Published by ArcelorMittal Europe Communications 01/2016. Available at http://fce.arcelormittal.com/repository/fce/PDF-technical-chapters/Prcat_Deepdrawing.pdf (accessed: 06.06.2018).
7. GOST 16523-97. Rolled sheets from quality and ordinary carbon steel for general purposes. Specifi cations. Introduced: 01.01.2000. Moscow: Standartinform. 2009. 12 p.
8. GOST 1050-2013. Metals products from nonalloyed structural qua lity and special steels. General specifi cation. Introduced: 01.01.2015. Moscow : Standartinform. 2014. 32 p.
9. GOST 9045-93. Cold-rolled thin sheets of low-carbon steel for cold stamping. Specifications. Introduced: 01.01.1997. Moscow: IPK Izdatelstvo standartov. 2003. 10 p.
10. Rumyantsev M. I. State-of-the-art types of sheet structure steel for manufacturing products by cold deformation. Available at: https://dpklms.magtu.ru/pluginfile.php/21746/mod_resource/content/0/СОВРЕМЕННЫЕ%20ТИПЫ%20ЛИСТОВОЙ%20КОНСТРУКЦИОННОЙ%20СТАЛИ%20ДЛЯ%20ПОЛУЧЕНИЯ%20ИЗДЕЛИЙ%20ХОЛОДНЫМ%20ДЕФОРМИРОВАНИЕМ.pdf (accessed: 02.09.2018).
11. Rumyantsev M. I.. Some results of development and application of the method for improving sheet rolling systems. Vestnik Magnitogorskogo gosudarstvennogo technicheskogo universiteta im. G. I. Nosova. 2017. Vol. 15. No. 1. pp. 45–55.
12. Rumyantsev M. I. Methods for development and improvement of rolling technologies to upgrade sheet rolling technological systems. Teoriya i tekhnologiya metallurgicheskogo proizvodstva. 2017. No. 4(23). pp. 26–36.
13. Rumyantsev М. I. Some approaches to improve the resource efficiency of production of flat rolled steel. CIS Iron and Steel Review. 2016. Vol. 12. pp. 32–36.
14. Kotsar S. L., Belyansky A. D., Mukhin Yu. A. Technology of sheet rolling production. Moscow: Metallurgiya. 1997. 272 p.
15. Frantsenyuk I. V., Frantsenyuk L. I. State-of-the-art technologies for production of rolled metal at Novolipetsk Metallurgical Plant. Moscow: IKTs «Akademkniga». 2003. 208 p.
16. Mukhin Yu. A., Solovyev V. N., Shunin A. V., Makarov E. V. et al. Rational temperature and speed modes of sheet rolling in the continuous wide-strip hot mill. Theory and praxis of rolled sheet production: collection of scientific works. Lipetsk: LGTU. 2008. pp. 107–115.
17. Wolanska N., Lis A. K., Lis J. Microstructure investigation of low carbon steel after hot deformation. Journal of Achievements in Materials and Manufacturing Engineering. 2007. Vol. 20. pp. 291–294.
18. Akpan E., Idoko A. Structural Evolution and Properties of Hot Rolled Steel Alloys. Journal of Minerals & Materials Characterization & Engineering. 2012. Vol. 11, Iss. 4. pp. 417–426.
19. Erdem G., Taptik Y. Effect of hot rolling conditions to produce deep drawing quality steels for continuous annealing process. Journal of Materials Processing Technology. 2005. Vol. 170. pp. 17–23.
20. Zavalishchin G. A. Improvement of production of cold-rolled sheet made of steels with decreased content of carbon to increase service properties: Dissertation … of Candidate of Engineering Sciences. Magnitogorsk: Magnitogorsky gosudarstvenny technicheski universitet im. G. I. Nosova. 2008. 183 p.
21. Rumyantsev M. I., Gorbunov A. V., Popov A. O., Vetrenko A. G., Molostov М. А. Development of technologies for hot rolling of widestrip steel of various purposes in rolling mills of different types. Computer program registration certificate. No. 2013612426 dated 27.02.2013. OBPBT. 2013. No. 1.

22. Rumyantsev M. I., Gorbunov A. V., Mitasov V. S. CR CAD. Computer program registration certifi cate. No. 2013611300 dated 09.01.2013. OBPBT. 2013. No. 5. Part. 3. p. 982.
23. Bald V., Kneppe G., Rosental D. Et. al. Innovation technologies for production of hot-rolled strip. МРТ. Metallurgicheskoe proizvodstvo i tekhnologiya metallurgicheskikh protsessov. 2000. pp. 26–41.
24. Ganzhin V., Kisilev Yu. Technology of the XXI century. Prospects of Russia. National metallurgy. 2003. No. 1. pp. 77–85.
25. Rosenthal D., Geerkens С., Kramer S., Klein C., Muller J. Twenty years of CSP. Success story of an extraordinary technology. Stahl und Eisen. 2009. Vol. 127, Iss. 11. pp. 73–87.
26. Ginzburg V. В. Flat-Rolled Steel Processes: Advanced Technologies. London (New York): Taylor & Francis Group. LLC. 2009. pp. 15–34.
27. Rumyantsev M. I., Shubin I. G., Zavalishchin A. N. et al. Estimation of quality of thin hot-rolled strips to determine the possibility of replacement of cold-rolled sheet steel of general purposes. Vestnik Magnitogorskogo gosudarstvennogo technicheskogo universiteta im. G. I. Nosova. 2007. No. 4. pp. 69–73.
28. Margan Mutkhukumarasvami K., Rokhanna Mark A., Das Bino K., Kumar Ashok, Sandkhu Khardzhit S. Agglomeration by adding reinforcing agent into sintering mixture. Patent RF No. 2365639: Applied: 16.09.2004. Published: 27.08.2009. Bulletin No. 24.
29. Rumyantsev M. I., Tsepkin A. S., Oplachko T. V. Unified approach for calculation of diff erential estimates at quality metering rolled products. Vestnik Magnitogorskogo gosudarstvennogo technicheskogo universiteta im. G. I. Nosova. 2007. No. 3. pp. 61–64.
30. Rumyantsev M. I., Ismagilov R. A., Zavalishchin A. N., Shubin I. G., Kornilov V. L., Antipanov V. G. Method of production of hot rolled sheet for zinc plating. Patent RF No. 2366731. Applied: 09.06.2008. Published: 10.09.2009. Bulletin No. 25.