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Yekaterinburg, Russia

Mikhailov G.G.,South Ural State University | Makrovets L.A.,South Ural State University | Smirnov L.A.,OAO Uralskii Institute Metallov
Steel in Translation | Year: 2015

The main reactions of calcium, cerium, lanthanum, silicon, and complex alloys with the active additive Ca–Si, Ca–Al, Ce–Si, La–Si, Ce–La, or Ce–Ca–Al are subjected to thermal analysis. On the basis of binary and ternary fusibility diagrams, the thermodynamic data are refined for the main reactions between complex alloys with rare-earth elements and the oxygen present in the liquid metal. Solubility surfaces are plotted for components of the Fe–Si–Ce–O, Fe–Si–La–O, Fe–Ce–La–O, and Fe–Ca–Al–Ce–O systems. From those diagrams, optimal compositions of complex alloys with rare-earth elements in terms of nonmetallic-inclusion formation are established by plotting the consumption of the active components. For each group of steels, the quantitative elementary composition of the active components used for reduction and modification of the nonmetallic inclusions must be calculated. The chemical and phase composition of the nonmetallic inclusions may be very complex even in the final stages of the reduction of oxides. A method is developed for taking account of the polyvalency of cerium in reduction processes. The thermodynamic data and diagrams obtained help provide a better understanding of the complex heterogeneous processes within multicomponent systems that contain liquid metals. In combination with experimental data for the solubility surfaces of the components and the consumption diagrams, it is possible to track the transitions from the nonequilibrium state of the metallurgical system to the equilibrium state. In other words, the degree of refining of the metal and the equilibrium composition of the nonmetallic inclusions may be determined. © 2015, Allerton Press, Inc.

Deryabin A.A.,OAO Uralskii Institute Metallov | Mogil'nyi V.V.,OAO Novokuznetskii Metallurgicheskii Kombinat NKMK
Steel in Translation | Year: 2010

Thermodynamic analysis of the transition of nonmetallic inclusions from metal to slag shows that, in this transition, breakaway of the inclusions from the metal is thermodynamically impossible and the inclusions accumulate at the interface on the slag side. This obstructs subsequent inclusions arriving at the interface and hinders their removal from the steel. Therefore, the successful assimilation of inclusions by the slag calls for the renewal of the slag layer adjacent to the metal by kinetic means-for example, by injecting inert gas into the steel. Industrial tests of argon injection into the steel in the intermediate ladle in casting confirm that the content of oxide inclusions in the rails is reduced. © 2010 Allerton Press, Inc.

Filatov S.V.,OAO Nizhnetagilskii Metallurgicheskii Kombinat NTMK | Kirichkov A.A.,OAO Nizhnetagilskii Metallurgicheskii Kombinat NTMK | Mikhalev V.A.,OAO Nizhnetagilskii Metallurgicheskii Kombinat NTMK | Zagainov S.A.,Ural State Technical University | And 2 more authors.
Steel in Translation | Year: 2010

In the blast-furnace shop at OAO Nizhnetagil'skii Metallurgicheskii Kombinat (NTMK), the smelting of low-silica vanadium hot metal is being introduced. Theoretical and experimental data reveal the influence of the pressure in the furnace's working space and coke quality on the reduction of titanium and the formation of refractory titanium compounds. The residence time of the melt in the hearth depends on its dimensions. © 2010 Allerton Press, Inc.

Odesskii P.D.,OAO NITs Stroitelstvo | Smirnov L.A.,OAO Uralskii Institute Metallov | Parshin V.A.,OAO Uralskii Institute Metallov | Kirichkov A.A.,OAO EVRAZ NTMK
Steel in Translation | Year: 2015

The influence of nitrogen as a microalloying element in steel for metallic structures is investigated. The use of nitrogen to improve the mechanical properties and low-temperature strength of rolled steel in various strength classes is very promising and permits reduction in the steel’s manganese content. © 2015, Allerton Press, Inc.

Smirnov L.A.,OAO Uralskii Institute Metallov | Kushnarev A.V.,OAO EVRAZ NTMK | Fomichev M.S.,OAO EVRAZ NTMK | Rovnushkin V.A.,OAO Uralskii Institute Metallov | Savel'ev M.V.,OAO EVRAZ NTMK
Steel in Translation | Year: 2013

A duplex process for the smelting of vanadium-bearing hot metal in oxygen converters is considered. Globally, this is one of the most efficient approaches to steel smelting. A wide range of high-quality steel may be produced, as well as vanadium slag for conversion to vanadium pentoxide and vanadium alloys. © 2013 Allerton Press, Inc.

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