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Mikhailov G.G.,South Ural State University | Makrovets L.A.,South Ural State University | Smirnov L.A.,OAO Ural Institute of Metals | Dresvyankina L.E.,ML NITs PAO Seversk Pipe Plant
Russian Metallurgy (Metally) | Year: 2016

Analysis of the ternary phase diagrams of Ce2O3- and CeO2-containing oxide systems allowed us to find the oxide compounds that form during steel deoxidizing with cerium and with cerium together with aluminum, calcium, magnesium, or silicon. The temperature dependences of the equilibrium constants of formation of Ce2O3 oxides and Ce2O3 · Al2O3, Ce2O3 · 11Al2O3, Ce2O3 · 2SiO2, 7Ce2O3 · 9SiO2 and Ce2O3 · SiO2 compounds are found. Surfaces for the component solubility in metallic melts Fe–Al–Ce–O–C, Fe- Ca–Ce–O–C, Fe–Mg–Ce–O–C, and Fe–Si–Ce–O–C are constructed. Nonmetallic inclusions that form in the course of experimental melts of St20 steel after its deoxidizing with silicocalcium and rare-earth metal (REM)-containing master alloys in a ladle furnace after degassing are studied. Phase inhomogeneity of the inclusions is found. As a rule, they consist of phases classified into the following three groups: oxide–sulfide, sulfide–oxide, and multiphase oxide–sulfide melt. Calcium aluminates are found to be components of complex sulfide-oxide noncorrosive inclusions. © 2016, Pleiades Publishing, Ltd.

Rovnushkin V.A.,OAO Ural Institute of Metals | Aksel'rod L.M.,OOO Gruppa Magnezit | Smirnov L.A.,OAO Ural Institute of Metals | Spirin S.A.,OOO Gruppa Magnezit | And 4 more authors.
Refractories and Industrial Ceramics | Year: 2015

Results are provided for a laboratory study of the reaction of industrial self-dissociating slag after steel treatment in an OAO NTMK furnace-ladle unit and synthetic slag of the system CaO–SiO2–Al2O3 with five forms of periclase-spinelid refractories produced by enterprises of Gruppa Magnezit in Russia and Slovakia (Slovmag), and also two Chinese producers. Refractory slag resistance is compared, and their mineral and phase compositions are studied before and after testing. © 2015 Springer Science+Business Media New York

Demidov K.N.,OAO Ural Institute of Metals | Vitushchenko M.F.,AO Arselormittal Temirtau | Smirnov L.A.,OAO Ural Institute of Metals | Zolin A.N.,AO Arselormittal Temirtau | And 9 more authors.
Refractories and Industrial Ceramics | Year: 2013

Processes are considered for conversion of high-phosphorus cast iron during steel smelting in 300-ton oxygen converters of AO Arselormittal Temirtau beneath magnesia slags of sensible composition. Technology is developed and assimilated, including application towards the end of blowing with oxygen of saturated magnesia slag (8-11% MgO) with basicity 3.0-3.4 and formation of a wear-resistant skull coating (with resistance of 1-2 melts) on the lining during slag blowing with high-pressure nitrogen with additions of magnesia alumina flux (MAF). Use of MAF flux provides an increase in slag MgO content (up to 9-10%) with maintenance of required metal dephosphorizing within the limits 97.1-98.1% with a phosphorus content in metal on average of 0.013-0.017%. © 2013 Springer Science+Business Media New York.

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