Nosov Magnitogorsk state technical university (Magnitogorsk, Russia):

V. A. Chaikin, Dr. Eng., Prof., e-mail: sro_ral@mail.ru

Smolensk regional branch of the Russian association of foundrymen (Smolensk, Russia):
A. V. Chaikin, Cand. Eng., Technical director, e-mail: chaika1983@inbox.ru

“Casting” LLC (Pavlodar, Kazakhstan):
A. D. Kasimgazinov, Chief technologist, e-mail: kasimgazinov@pf.casting.kz

Toraygirov Pavlodar state university (Pavlodar, Kazakhstan):
P. O. Bykov, Cand. Eng., Vice rector on academic work, e-mail: bykov_petr@mail.ru

Efficiency of diffusive steel deoxidizing by dispersing mixtures has been proven theoretically and confirmed in comparison with traditional mixtures. Deoxidizing and desulfurization processes were conducted in the units for complex steel treatment. Steel grades 25G2S (25Г2С), 35GS (35ГС), 65G (65Г), 70G (70Г) were used as a research material. The diffusive deoxidizer RDA presented by a mixture of carbon and silicon powders, as well as aluminium-containing materials was used to improve the deoxidizing effeciency. These powders have the especial properties, the main of which is their high dispersity, which brings new features to the mixture. RDA usage does not need any additional preparation. The mixture is packed in plastics bags in the amount of 10 kg each, which allows to decrease the amount of steelmakers’ hand labor and recovering period time by 10 minutes. RDA usage finalized in lowering of FeO concentration in a slag by 29.3% and MnO — by 60.2%, while desulfurization coefficient increased from 25.48 to 41.33%. The amount of used ferroalloys and fluorspar decreased by half. The expected economic effect is more than 3 million rubles.

1. Steel at the turn of the century. Under scientifi c edition of Karabasov Yu. S. Moscow: “MISiS”, 2001. 664 p.
2. Zolotukhin V. I., Gordeev E. I., Provotorov D. A., Golovko A. G. Stateof-the-art steel pouring systems for foundries and machine building plants. Liteyshchik Rossii. 2016. No. 9. pp. 15–17.
3. Dorantes M., Noradino P.; Maximiliano M. G. Type-2 fuzzy logic systems for temperature evaluation in ladle furnace. IEEE Latin America Transactions. 2016. Vol. 14, Iss. 8. pp. 3914–3920.
4. Attila G. C. Refining steel in an induction ladle furnace. Annals of the Faculty of Engineering Hunedoara. 2015. Vol. 13, Iss. 3. pp. 197–200.
5. Severstal plans upgrades to steel works, orders new ladle furnace. Iron & Steel Technology. 2016. Vol. 13, Iss. 4. p. 8.
6. Chaikin V. A., Chaikin A. V., Kolkolova A. V. et al. Improvement of the technology for melting steels in the “Samara Plant for technical castings” company using disperse materials. Proceedings of the XI Congress of Russia`s foundry workers. Yekaterinburg. 16–20 September 2013. pp. 78-83.
7. Chaikin V. A., Chaikin A. V. Refi ning of steels and iron by disperse modifies during melting in electricarc and induction furnaces. Proceedings of the XII Congress of Russia’s foundry workers. Nizhny Novgorod. 2015. pp. 155–159.
8. Vdovin K. N., Feoktistov N. A., Pivovarova K. G. et al. Fluxes for electro slag remelting of structural steels. Elektrometallurgiya. 2017. No. 4. pp. 13–19.
9. Chaikin V. A., Chaikin A. V. Application of diffusion deoxidizing and refining mixtures during melting steels and irons in electric arc furnaces. Proceedings of International scientific and practical conference: Foundry today and tomorrow. Edited by Kosnikov G. A. St. Petersburg: Kult-inform-press. 2014, pp. 161-164.
10. Hepuţ T., Ardelean E., Socalici A., Osaci M., Ardelean M. Steel deoxidation with synthetic slag. Metalurgia International. 2010. Vol. 15, Iss. 7. pp. 22–28.
11. Zherebtsov S. N., Chernyshev E. A. Effect of modification by ultradispersed powder complexes on alloy structure. Proceedings of XIII International scientific and practical conference “Advanced foundry technologies”. 16 – 20 November 2015, “MISiS”, pp. 142–145.
12. Kozhukhov A. A. Estimation of electric arcs available heat factor during melting under foamed slag in the state-of-the art EAFs. Elektrometallurgiya. 2015. No. 6. pp. 3–9.
13. Sidnyaev N. I. Probability theory and mathematical statistics: tutorial for bachelors. Moscow: Yurayt, 2015. 219 p.
14. Sidnyaev N. I. The theory of planning an experiment and analysis of statistical data. Moscow: Yurayt, 2014. 495 p.
15. Guo J., Cheng S., Cheng Z. Characteristics of Deoxidation and Desulfurization during LF Refining Al-killed Steel by Highly Basic and Low Oxidizing Slag. Journal of Iron and Steel Research International. 2014. Vol. 21. Iss. 2. pp. 166–173.
16. Tursunov N. K., Sanokulov E. A., Semin A. E. Study of desulfurization process of structural steel using solid slag mixtures and rare earth metals. Chernye metally. 2016. No. 4. pp. 32–37.
17. Kozlov L. Ya., Kolokoltsev V. M., Vdovin K. N. et al. Production of steel castings: tutorial. Edited by Kozlov L. Ya. Moscow: “MISiS”, 2003. 352 p.
18. Putan V., Putan A., Ardelean E. Influence of the addition of a reducing mixture slag and duration of treatment on the desulphurization and deoxidation efficiency. Solid State Phenomena. 2016. Vol. 254. pp. 144–148.