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Pavlov A.V.,Magnitogorsk Metallurgical Combine MMK | Onorin O.P.,Ural Federal University | Spirin N.A.,Ural Federal University | Polinov A.A.,Magnitogorsk Metallurgical Combine MMK
Metallurgist | Year: 2016

Results are given for analysis of agglomerate and pellet physicochemical properties. It is shown that with transfer of blast furnace smelting into an operating regime with a high proportion unfluxed pellets in a charge requires changing the main slag regime parameters, and also the furnace charging regime. It is established that due to the difference in agglomerate and pellet physicomechanical properties, and also as a result the high corrosiveness of primary slag obtained using unfluxed pellets, it is necessary to change the regime for material charging into a furnace. With an increase in the proportion of Sokolovo-Sarbaiskii Ore Mining and Processing Combine pellets in Magnitogorsk Metallurgical Combine blast furnace charge, there is a reduction in amount of magnesium in final blast furnace slags. This is accompanied by an increase in molten slag viscosity, a reduction in its sulfur absorbing capacity, and also an increase in the temperature range for iron ore mix melting with an increase in bottom gas pressure drop and limiting melt blast force. © 2016 Springer Science+Business Media New York


This article examines the energy content of steel production in an arc steelmaking furnace (ASF), the effect of furnace performance on the energy content of the combine's products, the feasibility of optimizing the energy balance of the ASF so as to minimize energy costs while still providing the energy resources necessary to execute the production process, and the effect of various factors on the technical and economic indices of ASF operation. It is found that making the operation of the furnace more cost-effective will require multiparameter optimization of its operating regime both for individual heats and for the shop as a whole on a week-to-week or month-to-month basis. © 2011 Springer Science+Business Media, Inc.


Spirin N.A.,Ural Federal University | Lavrov V.V.,Ural Federal University | Burykin A.A.,Ural Federal University | Rybolovlev V.Yu.,Magnitogorsk Metallurgical Combine MMK | And 2 more authors.
Metallurgist | Year: 2011

This article presents mathematical models, algorithms, and computer programs to solve a series of engineering problems in blast-furnace operation for MES-level automated information systems. The software that has been developed can be recommended for use in the real-time control of blast-furnace smelting, the design of automated work stations for engineers and technicians, the solution of a range of strategic problems encountered in production planning and the shipment of fuels and raw materials, and optimization of energy-resource management at Russian metallurgical plants. © 2011 Springer Science+Business Media, Inc.


Zaitsev A.I.,Bardin Central Research Institute for The Iron And Steel Industry | Stepanov A.B.,Bardin Central Research Institute for The Iron And Steel Industry | Sarychev B.A.,Magnitogorsk Metallurgical Combine MMK | Dzyuba A.Y.,Magnitogorsk Metallurgical Combine MMK | Shaposhnikov N.G.,Bardin Central Research Institute for The Iron And Steel Industry
Metallurgist | Year: 2015

A detailed study is made of the effect of the form and content of impurities and nonmetallic inclusions on the quality characteristics of spring steels of type 60C2XA. It is established that to prevent the formation of “blowhole” defects it is necessary to limit the steel’s content of gas-forming elements as follows: [H] < < 3.5 ppm, [N] < 60 ppm, [O] < 11 ppm, and [C] < 0.54%. It is shown that the hydrogen content of the steel has the strongest effect on the formation of such defects. To make the steel cleaner in terms of its content of nonmetallic inclusions, it is best to make a metallic semifinished product with a high carbon content and a low (200–400 ppm) content of active oxygen, add carbon-bearing materials early during tapping, and proportion the additions of manganese- and silicon-bearing ferroalloys in a regime which leads to the formation of easily removed silicate inclusions. Another effective measure is to use assimilating covering slags composed of two layers in the tundish. To obtain good quality characteristics for rolled products, it is necessary ensure that the combined content of Sn, Pb, and Zn does not exceed 0.008–0.013% and to use a certain temperature-time regime for the casting operation. Here, the optimum degree to which the steel is heated above the liquidus temperature in the tundish is 23–30°C. Experimental results confirmed the adequacy of the principles that were formulated and the effectiveness of the technological measures that were developed. © 2015 Springer Science+Business Media New York


Nastich S.Y.,Bardin Central Research Institute for The Iron And Steel Industry | Soya S.V.,Bardin Central Research Institute for The Iron And Steel Industry | Molostov M.A.,Magnitogorsk Metallurgical Combine MMK | Vasiliev I.S.,Magnitogorsk Metallurgical Combine MMK | Dyakonova N.B.,Bardin Central Research Institute for The Iron And Steel Industry
Metallurgist | Year: 2012

Microstructural parameters, impact strength, and DWTT properties of coil steel X70 are governed to a considerable degree by a sufficiently high temperature for the start of rolling in 2000 mill finish stands (T sfr). Results are provided for a study of steel microstructure in relation to cold brittleness threshold during DWTT (T 90) and proportion of bainitic ferrite on T sfr. Rolling with T sfr close to a temperature for retarding recrystallization (T 5 or T NR) causes a difference in steel matrix grain size and an increase in volume fraction of bainitic transformation products with lath morphology (bainitic ferrite) due to partial austenite recrystallization. This structure leads to the worsening of steel impact strength and DWTT properties. The properties of coil steel may be improved by increasing steel niobium content and rolled product interim cooling. © 2012 Springer Science+Business Media New York.


Nastich S.Yu.,Bardin Central Research Institute for The Iron And Steel Industry | Morozov Yu.D.,Bardin Central Research Institute for The Iron And Steel Industry | Matrosov M.Yu.,Bardin Central Research Institute for The Iron And Steel Industry | Denisov S.V.,Magnitogorsk Metallurgical Combine MMK | And 2 more authors.
Metallurgist | Year: 2012

Results are presented for development and introduction into production in a new MMK 5000 mill for thick rolled sheet from low-alloy steels with increased strength properties (σ y ≥ 500 N/mm 2 and σ y ≥ 570 N/mm 2), impact strength (KCV -40 ≥ 200-270 J/cm 2), and cold resistance. Features of structure formation are studied in sheet of considerable thickness in the course of controlled rolling with accelerated cooling. The effect of the amount of reduction in subsequent passes of the roughing stage for sheet on cold resistance during the FWT is revealed. Transmission electron microscopy is used to show that the optimum set of properties for high-strength sheet is achieved with formation of a fine steel ferrite-bainite microstructure whose main structural components are quasipolygonal and acicular ferrite. © 2012 Springer Science+Business Media, Inc.


Pak Y.A.,Bardin Central Research Institute for The Iron And Steel Industry | Filippov G.A.,Bardin Central Research Institute for The Iron And Steel Industry | Yusupov D.I.,Bardin Central Research Institute for The Iron And Steel Industry | Tyuftyaev A.S.,AGNI K Company | And 2 more authors.
Metallurgist | Year: 2014

An improved design of tundish which has chambers for the plasma heating of liquid steel has been developed and tested. The design of the tundish improves heat and mass transfer processes inside it. The new design elements of the tundish accelerate the entry of the metal into zone occupied by the high-temperature plasma in order to improve the conditions for its heating and making the metal’s temperature uniform throughout the volume of the tundish. Two tundishes of the new design were made and the plasma heating unit was factory-tested during the casting of steel on continuous caster No. 4 in the oxygen converter shop at the Magnitogorsk Metallurgical Combine. © 2014, Springer Science+Business Media New York.


Talanov O.P.,Bardin Central Research Institute for The Iron And Steel Industry | Nastich S.Yu.,Bardin Central Research Institute for The Iron And Steel Industry | Nikitin V.N.,Bardin Central Research Institute for The Iron And Steel Industry | Denisov S.V.,Magnitogorsk Metallurgical Combine MMK | And 5 more authors.
Metallurgist | Year: 2014

A technology is developed under MMK conditions for industrial production of steel 18KhGNMFTR plate 9-25 mm thick for platforms of heavy-duty quarry dump trucks and mining equipment. The set of mechanical properties is achieved by thermal improvement (double quenching and tempering) by which property stability is achieved with the formation of a uniform fine-grained martensitic microstructure. © 2014 Springer Science+Business Media New York.


Shemshurova N.G.,Magnitogorsk State Technical University | Urmatskikh A.V.,Magnitogorsk Metallurgical Combine MMK | Lokotunina N.M.,Magnitogorsk State Technical University
Metallurgist | Year: 2014

This article examines features and practical introduction of a technology for making high-rigidity special sections on section-bending machines at the Magnitogorsk Metallurgical Combine. It also describes characteristics of the configurations of these products and their main service properties. © 2014, Springer Science+Business Media New York.

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