Ural Institute of Metals

Yekaterinburg, Russia

Ural Institute of Metals

Yekaterinburg, Russia
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Panfilova L.M.,Ural Institute of Metals | Smirnov L.A.,RAS Institute of Metallurgy | Yakovleva I.L.,RAS Institute of Metal Physics | Tereshchenko N.A.,RAS Institute of Metal Physics
Metallurgist | Year: 2017

Research results are provided for creation of high-strength economically alloyed corrosion-resistant steel 14Kh17N2AF for submersible centrifugal electric pump shafts. Tests are conducted for steel mechanical properties and corrosion resistance. The fine structure and composition of carbide and carbonitride phases are studied and grain structure and precipitating phase distribution are evaluated. The new steel 14Kh17N2AF is not inferior to the mechanical properties of steel 03Kh14N7B used normally for these purposes, and it has an advantage with respect to corrosion resistance indices, machining, and economy. Results of full-scale testing of electric pump shafts in boreholes establish that shaft service life increases by 30%, and pitting corrosion resistance improves by 20%. © 2017 Springer Science+Business Media New York


Kazak A.K.,Ural Institute of Metals | Didenko V.V.,Emal Stavan Company
Metallurgist | Year: 2016

The article considers high-temperature enamel coatings prepared from charges synthesizing enamel with a sufficiently high fi ring temperature and providing the required protective properties and heat resistance. Brief scientific and experimental research is given for the coatings obtained based on compositions modified with additions of refractory fillers added in the form of nanosize oxide powders. © 2016 Springer Science+Business Media New York


Frolov Y.A.,Research and Production Enterprise Uralelektra | Polotsky L.I.,Ural Institute of Metals
6th Int. Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Including Proceedings from the 42nd Ironmaking and Raw Materials Seminar, and the 13th Brazilian Symp. on Iron Ore | Year: 2012

This paper proposes the three-dimensional mathematical model of sintering process which developed for decision of theoretical and practical problems. The model allows to achieve dynamic distribution of temperatures and chemical composition of mix, smelt, cake, and gas in volume of the sintering bed in a real operating mode of sinter machine, taking into account transient processes, as well as parameters of a gas stream in waste gases system with account of air leakages in elements of waste gas system. Sintering process is presented through differential equations system in private derivatives for the mix parameters and ordinary differential equations for gas stream parameters. To describe chemical reactions in a bed the frontal model is accepted. A grain of ore part is considered as a sphere of determinate diameter in which fronts CaCO 3→CaO, MgCO3→MgO, Fe2O 3→FeO, FeO→Fe2O3 are moving inside. A particle of solid fuel is considered as a sphere of variable diameter decreasing during carbon burning process. Moving fronts speeds are function of temperature of material and gas composition. For research purposes the model is used particularly to develop a theory of mix drying in a bed and gas dynamic of sintering process. For applied problems the model is used for calculation of sintering and cooling zones of sinter machine in Dneprodzerzhinsk (Ukraine) with the area of 520 M2, and for reconstruction of sinter machines of the Chelyabinsk Steel Plant (Russia) with the area of 240 M2.


Krutikova I.A.,Uralmashzavod Company | Panfilova L.M.,Ural Institute of Metals | Smirnov L.A.,Ural Institute of Metals
Metallurgist | Year: 2010

Results are presented for laboratory and industrial studies of the influence of microalloying steels with vanadium and nitrogen on static strength, resistance to brittle and delayed failure of bolt joints. Dissolution in austenite and precipitation during tempering of carbide and nitride phases, microstructure and hardenability of bolts, and the results of fractographic study of fractures are studied. Features of the effect of various factors on an increase in strength, cold resistance, and resistance to slow failure of bolt steels microalloyed with vanadium and nitrogen are discussed. © 2010 Springer Science+Business Media, Inc.


Frolov Y.A.,Uralelektra Scientific and Production Enterprise | Polotskii L.I.,Ural Institute of Metals
Metallurgist | Year: 2015

This article presents a three-dimensional mathematical (dynamic) model of the sintering process. The model was developed to solve theoretical and practical problems. It allows real-time determination of the distributions of the temperatures and the chemical compositions of the charge, the melt, the sinter cake, and the gas in the bed of charge materials with allowance for transients. The model also permits real-time determination of the temperatures in the pallets and the parameters of the gas flow (including infiltrating air) in the flue system of the sintering machine. © 2015 Springer Science+Business Media New York.


Frolov Y.A.,Uralelektra Scientific and Production Enterprise | Polotskii L.I.,Ural Institute of Metals
Metallurgist | Year: 2015

A three-dimensional mathematical (dynamic) model is presented to describe the sintering process. The model was developed to solve theoretical and practical problems. It allows real-time determination of the dynamic distribution of the temperature and chemical composition of the charge, the melt, the sinter cake, and the gas in the bed with allowance for transients, as well as the temperatures in the pallets and the parameters of the gas flow in the flue channel – including air infiltration. © 2015, Springer Science+Business Media New York.


Nechkin G.A.,Ural Institute of Metals | Kobelev V.A.,Ural Institute of Metals | Chernavin A.Y.,Ural Institute of Metals | Chernavin D.A.,Ural Institute of Metals
Metallurgist | Year: 2016

One way of increasing the smelting rate in a blast furnace is to increase the gas permeability of the lower part of the stock. Gas permeability in this zone and the smoothness of the furnace’s operation depend on the ability of the intermediate slag to filter through the coke column. A method of studying filterability has been developed and introduced, the method making it possible to reliably assess the behavior of the iron-orebearing materials in a blast furnace at high temperatures. It was established by laboratory studies and confirmed by factory tests that the filterability of molten blast-furnace slag is affected by the presence of the oxides MgO, MnO, and CaO, which are added to charge that is used to make sinter. The magnitude of this effect depends on the composition of the minerals that contain these oxides. © 2016 Springer Science+Business Media New York


Panfilova L.M.,Ural Institute of Metals | Smirnov L.A.,Ural Institute of Metals
Metallurgist | Year: 2016

The effect of microalloying additions of N, V, Ti, Al, and Nb on structure formation and properties of medium-carbon steels alloyed mainly with chromium (30Kh2AF–40Kh2FABT type) is considered. Steel microalloying makes it possible to provide marked austenite structure refinement due to grain growth limitation by (Ti, V)N particles, retardation of austenite recrystallization and grain growth during stamping by Nb(C, N) particles (and Nb in solid solution), which leads to the formation of a fine final steel structure, as a result of which there is improvement of both strength properties and impact strength. Steel of the class in question may be produced by economic controlled stamping technology with cooling from rolling heating and subsequent tempering instead of heat treatment with quenching and separate heating and tempering. As a result, a unique set of properties is achieved: mechanical properties, brittle failure resistance, corrosion resistance, seismic resistance, fire resistance of long rolled product, building structure components, engineering components, oil recovery equipment, etc. © 2016 Springer Science+Business Media New York


Lazutkina O.R.,Ural State Technical University | Kazak A.K.,Ural Institute of Metals | Ponomareva M.V.,Ural State Technical University
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2011

The dependence of the oxidation rate of steel under a film of enamel at the firing temperatures of the enamel is examined. The size of the critical gas bubble which breaks through the enamel film during annealing is calculated and determined experimentally. © 2011 Springer Science+Business Media, Inc.


Smirnov L.A.,Ural Institute of Metals | Rovnushkin V.A.,Ural Institute of Metals | Smirnov A.L.,Ural Institute of Metals
Russian Metallurgy (Metally) | Year: 2015

Vanadium slag samples, which are taken at various stages of the converter devanadation of lowsilicon (0.05–0.15% Si) cast iron and after cooling in converter pans, are studied by electron-probe microanalysis and X-ray diffraction. The evolution of the compositions of spinelide, silicate, and metallic phases is investigated. The experimental results are compared with the well-known formation mechanism and the phase composition of the slags of the devanadation of silicon cast irons during oxygen or air blowing. It is shown that, despite the differences in the compositions and the grain sizes of a spinelide phase, the mechanism of its formation at the initial stages of oxidation of cast iron elements with different silicon contents is the same. The spinelide composition and the element distribution over a grain depend on the cast iron composition and the quantity and composition of the silicate phases that form during devanadation in a converter and upon cooling of a slag ingot © 2015, Pleiades Publishing, Ltd.

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