Most of the reactions of reducing gas (CO) interaction with an oxide melt flow in a mixed regime, which is realized at the comparable diffusion rates (υ) of the components to the point of the reaction and an adsorptive-and-chemical act. For the theoretical calculations of the rate it is necessary to fi nd the value υ in a kinetic regime. In assumption of electrochemical nature of interaction of reducing gas (CO) with an oxide melt, which contains metallic ions MenOm , a kinetic equation has been deduced for the calculation of the rate of a reduction process in the kinetic regime. The equation takes into account physical and chemical properties of interfacial phases. A good correspondence of the calculations and experimental data have been shown at the example of interaction of oxide melt system of CaO – SiO2 – Al2O3 containing up to 5.7 % (wt.) of Fe2O3 with a gas phase of carbon monoxide at partial pressure (5.0)102 MPa and 1623 K.

In the paper the author sets out the results of a stressed state by an asymmetrical rolling of a band in rolls with a reverse taper. The analysis of the results shows that by an asymmetrical rolling of a band in rolls with a reverse tape more favourable conditions of the stressed state are provided. They promote the removal of all internal defects of a blank at the expense of a high hydrostatic pressure, as well as the decrease of an axial tension. That reduces the probability of metal destruction in a lengthwise direction.

The paper presents the analytical expression of the effective heat capacity of steels with a carbon content of less than 0.5%. This expression takes into account all the phase transformations occurring during the crystallization of these steels. The derived expression enables to improve the accuracy of the mathematical modeling of the process of solidification of carbon steels.

Influence of the thin metal layer coating a disperse spherical particle on the melting temperature of this layer is investigated by the method of thermodynamic analysis. It is shown that the melting temperature of such layer considerably exceeds the melting temperature of the coating substance, if the surface tension of the melt – refractory particle is larger than that of the coating layer – particle. This can be applied to increase stability of the exogenous nano- and ultradisperse particles used for modifiсation of high-temperature alloys.

Article describes the method of steel alloying by vanadium with the use of converter vanadium slag. Thermodynamic evaluation of the process of oxides reduction contained in the vanadium slag during the metal processing by vanadium slag in the ladle was performed, which allowed to determine the technological parameters of the process. Assessment of reduction of oxide elements contained in vanadium slag, in particular, vanadium, iron, manganese, was conducted on the residual content of oxides in the slag. On the basis of results of thermodynamics calculations and experiments authors defined that at optimal correlations of reducing agents (carbon and ferrosilicon) successful reduction of vanadium (98 – 99 %) and iron from converter vanadium slag takes place with the limited recovery of titanium and manganese.

The article is devoted to the choice of the optimal, in terms of structure, insulation material, which largely determines the efficiency of heat use in thermal units. The results of a new approach to interpretation of the coefficient of thermal conductivity of porous thermal insulating materials are provided. Experimental verification of this hypothesis is given.

The changes in the composition, structure and dispersion of chromium carbonitride during storage and heating in gas media are investigated. It is found that during annealing in argon and nitrogen at a temperature of 1273 – 1373 K carbonitride becomes carbide Cr3C2 , and during annealing in hydrogen – carbide Cr7C3 . The transformation of carbonitride into carbide Cr3C2 is accompanied by enlargement of the nanopowder that takes place in accordance with the mechanism of solid-state coalescence. Carbonitride interaction with atmospheric gases (oxygen and moisture) occurs in accordance with the adsorption-diffusion mechanism and it is accompanied by a significant increase in oxidation in the first 24 hours. The temperature at the beginning of oxidation in the air depends on the nanoscale and due to the change in particle size from 22 to 53 nm increases from 542 to 568  K. The size dependences for oxidation and the oxidation onset temperature are obtained.

Viscosity of СаО – Al2O3 – SiO2 – 8 % MgO – 4 % B2O3 slag system has been studied in a wide range of chemical compositions. The simplex-lattice method has been used to plan the experiment. It is shown the slag containing 15 – 25 mass % Al2O3 , 8 mass % MgO and 4 mass % B2O3 have 6 – 8 units basicity and they are characterized by high values of viscosity changing within the limits of 9,4 – 26,4 P in the temperature range of 1500 – 1530 °С. The high enough liquid mobility is provided by the shift of slag with 5 – 8 units basicity in the right region of local simplex, i.e. it depends on Al2O3 concentration. In the temperature range the viscosity of the slag is changed within the limits of 1,5 – 6,1 P.

The experimental study of the effect of carbon-fluorine containing additives in flux OK 10.71 for 10HSND steel welding has been carried out. The studies have shown, that the additive in the composition of an aluminate-base flux has a positive effect on the weld quality. It has been found out that using carbon-fluorine containing additives in an amount of 4 and 6 % in OK 10.71 flux by 10HSND steel welding the total oxygen content in the weld decreases, but the value of required mechanical properties and the impact viscosity at low temperatures increase, at the expense of reducing the impurity of the weld by oxide nonmetallic inclusions, besides the carbon concentration in the welds remains at the carbon concentration level of base metal.

In this paper the results of the investigations of the wet laboratory separation of the primary concentrates from the Siberian iron-ore deposits (raw materials of Abagurskya concentrating mill –“Evrazruda” JSC) are shown. Wet magnetic analysis has been carried out on nine samples (0.07 mm class) of two ores types – magnetite and sub-acidulate at the magnetic field (H = 80 kA/m) ores. The quantity of the obtained largest magnetic product output is above 68 % (Abakan) for magnetite ores and 43 – 45 % for sub-acidulate ores, i.e. the yield diminishes with a decrease of the magnetite content at the initial material. Practical guidelines: it is appropriate to concentrate sub-acidulate ores at the common charge with the magnetite ores to decrease the losses of the iron with tailings; it is necessary to complete the reconstruction of the magnetic systems of PBM 90/250 separators with using the high-insensitive magnets.

By high-temperature X-ray diffraction during thermal cycling tests in vacuum λ-abnormal effects of thermal deformation of crystalline lattice boiler steel 10, 08H18N10T, 12H1MF, D-59 (10H13G12BS2N2TS2) in a narrow temperature range are set. They are not explained by the known phase transitions I and II, and are associated according to the analysis of the relative integrated intensities of the diffraction lines with the grain-boundary transformations and changes of the orientations of grains, having an influence on physical, mechanical characteristics and the efficiency resource of the heat transfer surfaces.

The effect of regimes of heat treatment, as well as acid and mechanical methods of removing rolled scale on the regularities of mechanical properties change of low carbon steel wire rod of 1kp grade are studied. 

The effect of ion-beam nitriding on a structure, and phase composition as well as tribological properties of thermal-sprayed coating obtained by supersonic deposition of austenitic steel 06X19H9T was investigated. It was shown that ion-beam treatment results in an increase of microhardness of coatings surface layer up to 785 – 1410 HV 0.025 and wear resistance up to 35 times. Based on the obtained results the temperature regime of ion-beam nitriding which ensures the highest tribological and strength properties was chosen.

The production and use of profile pipes grows steadily in construction. In comparison with pipes of round section their advantages are: metal economy, big mechanical durability, smaller wind loading. In the paper the authors show the results of the researches on development of the production technology of triangular cross-section pipes on a rolling mill unit.

In this paper we study examined the impact of various options and parameters of melting temperature of the melt composition AK7 fill in lost foam casting for the content of nonmetallic inclusions in the cast state. It was found that the minimum content of γ-Al2O3 in the finished alloy provide temperature melt overheating – up to 880 – 890 or 950 – 940 °C, the temperature in the casting mold – 820 – 830 °C.