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30 years of the Novotroitsk branch of NUST MISIS
ArticleName Application of complex modifiers in the production of steel with increased requirements for non-ferrous metallic inclusions
DOI 10.17580/chm.2022.05.02
ArticleAuthor G. A. Kunitsyn, M. S. Kuznetsov, A. N. Shapovalov, I. V. Bakin

JSC Ural Steel, Novotroitsk, Russia:
G. A. Kunitsyn, Dr. Eng., Technical Director, e-mail:
M. S. Kuznetsov, Cand. Eng., Head of department, e-mail:


Novotroitsk Branch of NUST MISIS, Novotroitsk, Russia:
A. N. Shapovalov, Cand. Eng., Associate Professor, Head of the Dept. of Metallurgical Technologies and Equipment, e-mail:


NPP Tekhnologiya, Chelyabinsk, Russia:
I. V. Bakin, Head of Innovation, Modernization and Technical Development Department, e-mail:


Ladle treatment of steel with calcium-containing flux-cored wires is an integral part of modern production technology. However, using only silicocalcium and aluminum, steelmakers are not always able to change the morphology of non-metallic inclusions (NI) in the right direction and create conditions for their removal from the liquid metal. The results of a pilot-industrial experiment on the production of steel with increased requirements for non-metallic inclusions are presented. During the experiment, instead of a standard wire with SС40 grade silicocalcium, a flux-cored wire with complex modifiers was used. Complex microcrystalline modifiers contained, in addition to calcium, such alkaline earth metals as barium and strontium. It has been established that the replacement of silicocalcium with experimental variants of modifiers provided a decrease in the maximum score for brittle silicates in the sheet metal (according to GOST 1778) from 4.0 to 1.5–2.5. The maximum contamination of sheet metal with non-deforming silicates decreased from 4.0 points according to the standard technology to 3.0–3.5 points when using experimental microcrystalline modifiers. Improvement of the basic physical properties of sheet metal was the result of the reducing the contamination of steel with non-metallic inclusions with experimental modifiers. Thus, the replacement of silicocalcium with experimental modifiers provided an increase in the strength properties of rolled sheets both in static tensile tests and in dynamic impact bending tests at low temperatures. The indicated influence was observed for all variants of experimental modifiers consumption. At the same time, with an increase in the consumption of modifiers, the positive effect on the mechanical properties of steel, as a rule, increased.
V. A. Golubtsov, I. V. Ryabchikov, A. A. Tokarev, V. V. Novokreshchenov, A. O. Ovodov took part in the work.

keywords Pipe steel, ladle treatment, non-metallic inclusions, non-deforming silicates, steel modification, silicocalcium, microcrystalline complex modifiers

1. GOST 1778–70. Steel. Metallographic methods for the determination of nonmetallic inclusions. Introduced: 01.01.1972.
2. Dyudkin D. А., Kisilenko V. V. Modern steel production technology. Moscow: Teplotekhnik, 2007. 529 p.
3. Basak S., Kumar Dhal R., Roy G. G. Efficacy and recovery of calcium during CaSi cored wire injection in steel melts. Ironmaking & Steelmaking. 2010. Vol. 37. Iss. 3. pp. 161–168.
4. Ren Y., Zhang L., Li Sh. Transient Evolution of Inclusions during Calcium Modification in Linepipe Steels. ISIJ International. 2014. Vol. 54, Iss. 12. pp. 2772–2779.
5. Zhao D., Li H., Cui Y., Yang J. Control of Inclusion Composition in Calcium Treated Aluminum Killed Steels. ISIJ International. 2016. Vol. 56, Iss. 7. pp. 1181–1187.
6. Gollapalli V., Venkata Rao M. B., Karamched Phani S., Borra Ch. Rao, Roy Gour G., Srirangam P. Modification of oxide inclusions in calcium-treated Al-killed high sulphur steels. Ironmaking & Steelmaking. 2019. Vol. 46, Iss. 7. pp. 663–670.
7. Liu C., Kumar D., Webler B. A. et al. Calcium Modification of Inclusions via Slag/Metal Reactions. Metall. Mater. Trans. B. 2020. Vol. 51. pp. 529–542.
8. Yang S., Li J., Wang Z. et al. Modification of MgO·Al2O3 spinel inclusions in Al-killed steel by Ca-treatment. Int J Miner Metall Mater. 2011. Vol. 18. pp. 18–23.
9. Yang W., Zhang L., Wang X., Ren Y., Liu X., Shan Q. Characteristics of Inclusions in Low Carbon Al-Killed Steel during Ladle Furnace Refining and Calcium Treatment. ISIJ International. 2013. Vol. 53, Iss. 8. pp. 1401–1410.
10. Zhao D., Li H., Bao Ch., Yang J. Inclusion Evolution during Modification of Alumina Inclusionsb y Calcium in Liquid Steel and Deformation during Hot Rolling Process. ISIJ International. 2015. Vol. 55, Iss. 10. pp. 2115–2124.
11. Zhang T., Liu C., Mu H., Li Y., Jiang M. Inclusion evolution after calcium addition in Al-killed steel with different sulphur content. Ironmaking & Steelmaking. 2018. Vol. 45, Iss. 5. pp. 447–456.
12. Khoroshilov А.D., Grigorovich К.V. Thermodynamic features of the modification of non-metallic inclusions with calcium in low-carbon steels deoxidized with aluminum. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2019. No. 62 (11). pp. 860–869.
13. Kumar B., Mishra S., Rao M. B. V., Roy G. G. Experimental investigation of recovery and efficiency of calcium addition through cored wire in steel melt at Visakhapatnam Steel Plant. Ironmaking & Steelmaking. 2019. Vol. 46, Iss. 5. pp. 454–462.
14. Golubtsov V.А., Milyuts V. G., Tsukanov V. V. The effect of complex modification on the contamination of shipbuilding steel with non-metallic inclusions. Tyazheloe mashinostroenie. 2013. No. 1. pp. 2–5.
15. Bakin I. V., Shaburova N.А., Ryabchikov I. V. et. al. Experimental study of refining and modification of steel with Si–Ca, Si–Sr and Si–Ba alloys. Stal. 2019. No. 8. pp. 14–18.
16. Irons G. A., Tong X.-P. Treatment of Steel with Alkaline-earth Elements. ISIJ International. 1995. Vol. 35, Iss. 7. pp. 838–844.
17. Rozhikhina I. D., Nokhrina О. I., Dmitrienko V. I., Platonov М. А. Modification of steel with barium and strontium. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2015. No. 58 (12). pp. 871–876.
18. Morozov S. S., Kuznetsov А. А., Boldyrev D. А. Increasing the service life of tooling made of heat-resistant austenitic steel by treatment with barium-strontium carbonatites. Stal. 2020. No. 4. pp. 41–43.
19. Mukai K., Han Q. Application of Barium-bearing Alloys In Steelmaking. ISIJ International. 1999. Vol. 39, Iss. 7. pp. 625–636.
20. Grigorovich К. V., Demin К. Yu., Arsenkin А. М. et. al. Prospects for the use of barium-containing ligatures for deoxidation and modification of transport metal. Metally. 2011. No. 5. pp. 146–156.
21. Makrovets L. А., Samoylova О. V., Mikhaylov G. G., Bakin I. V. Phase equilibria realized in the deoxidation of a low-carbon iron-based melt with silicostrontium. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2021. No. 64 (6). pp. 413–419.
22. Shapovalov А. N., Golubtsov V. А., Bakin I. V., Ryabchikov I. V. The use of complex modifiers to reduce the contamination of steel with corrosion-active non-metallic inclusions. Chernye Metally. 2020. No. 6. pp. 4–10.
23. Bakin I. V., Shapovalov А.N., Kuznetsov М. S. et. al. Industrial tests of microcrystalline complex alloys with alkaline earth metals in the smelting of pipe steel. Stal. 2020. No. 11. pp. 21–25.
24. GOST 1497–84. Metals. Methods of tension test. Introduced: 01.01.1986.
25. GOST 9454–78. Metals. Method for testing the impact strength at low, room and high temperature. Introduced: 01.01.1979.

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