The influence of critical corners of longitudinal and transversal waves propagation on reliability of measurements in the non-destructive method of adhesion control of cast-iron coverages is described. The article considers superficial Love and Rayleigh waves that are formed during the transformation of the longitudinal wave in the sample of metal on which applied a thin solid coating. The model of distribution of surface waves is expounded for gas-thermal chromic coverage in a 0,35 – 0,55 mm thick on cast-iron. The accuracy of the above approach is confirmed by a standardized method of mechanical separation on a tensile testing machine. The errors of determination of adhesion of coverage are appraised.

Destruction of the thermally reinforced steel St3sp is considered at monaxonic tension. Influence of corner of meeting of crack is investigational with the border of division of areas in a metal with a different microstructure. It is shown that at crack movement from structure of less strong in stronger at meeting corners from 0 to the 45°th crack changes the direction and extends on limit of the section. At the further increase of corner of meeting a crack crosses a border and spreads practically on a former trajectory. The maximal rejection of crack on the border of division of two structures is arrived at coal 45°.

The results of experimental studies are shown using new measurement techniques for non-contact measurements of geometric billets on edge-bending press sector of the line 1420. The estimation of the influence of geometry on the edge of the pipe blank form to the marginal zone after subsequent processes is described. The article lists he steps of the pilot study. The experimental data is shown as coordinate points. A comparative analysis of the results of measurements of edges geometry was made in various ways. The advantages and a perspective of photogrammetry are described for the production of large diameter pipes.

This article describes methods allowing to project formation of nitrogen oxides in combustion products of gaseous fuels. The authors claim to have obtained the values of projected concentrations of nitrogen oxides in exhausting gases resulting from burning natural gas in burners using different fuel and air mixing techniques. Other conditions being equal, burners with open torches – plate flame burners (ВPF), radiation burners (BR) and improved fuel mixing burners generate the minimum content of nitrogen oxides in combustion products. Burners without pre-mixing of fuel and air generate a slightly higher content of nitrogen oxides. Injection burners generate the most toxic smoke gases. Heated combustion air increases the oncentration of oxides in the smoke two to three times. Calculations made in accordance with the methods designed for high temperature furnaces coincide within the range of 5 to 7 %, for low temperature furnaces – at 20 and more %. If the combustion air is highly heated the gap is larger.

The structure of interactive operational planning procedure of the technological cold-shaped pipes manufacturing is presented. Generation and search of acceptable schedules of loading of workplaces are realized by using the genetic algorithm, allowing quickly enough to solve complex semistructured optimization challenges in a mode close to a mode of real time.

The mathematical model and software algorithms for finding of polynomial describing forms of electrical arcs axes in cases of two or three arcs of direct current or middle situation of arcs of three-phase alternating current burning among electrodes and current-carrying surface were proposed. The software which allows approximately calculate forms of axes of arcs’ columns in case of electromagnetic coupling of two or three arcs. Results of the modeling for argon arcs are represented. It has been established that in the case of arcs’ coupling with equal currents the form of axis of arc column depends on the kind of the current, number of arcs and distance among them and slightly depends on amperage.

The features of appearance of beats in power chains of beats-machine in electromechanical systems of traction mechanisms are considered. The authors studied the influence on the dynamics of gap transients in elastic connection and scattering of energy oscillation by electric drive, with a decrease of active resistance in the electric motor.

Service conditions and a high-temperature abrasive wear of rolls are observed. Principal causes of roll wear are thermal, oxidative, frictional and abrasive ones, and also thermal cracks are formed on a roll surface as a result of cyclic heating and cooling during operating process. Durability increase measures of mill rolls are shown in the paper.

A mathematical modeling and analysis of the impact of pumps’ construction and working environment on their resistance have been carried out in order to study the possibilities of reducing the time and cost of developing and perfecting of new flow parts of ore pumps. A new construction of the pump’s impeller (type 1GrК 160/31, 5) was offered.

A method for thermodynamic analysis of complex deoxidation process of metallic melts is proposed. This method allows to determine the effect of a weaker element-deoxidizer on increasing deoxidizing ability of a stronger element-deoxidizer. Oxygen solubility curves pass through a minimum. Analysis of the equation of dependence of the concentration of oxygen in the melt on the elements-deoxidizers contents for the presence of extremum possible to obtain an equation for determining the content of a stronger element-deoxidizer, wherein the oxygen concentration is the lowest. A thermodynamic analysis of the joint infl uence of aluminum and silicon on the solubility of oxygen in the melts of Fe – Co system has been performed. Deoxidation reaction products may be formed as mullite (3Al2O3·2SiO2 ) and kyanite (Al2O3·SiO2 ). The presence of silicon in the melt enhances the deoxidizing ability of aluminum: insignificantly in the case of formation of compound 3Al2O3·2SiO2 and significantly in the case of formation of compound Al2O3·SiO2 . Oxygen solubility curves in the case of formation of compound Al2O3·SiO2 pass through a minimum, the position of which depends on the content of aluminum in the melt and is not dependent on the silicon content. The aluminum content in the minimum points is insignificantly reduced from iron to cobalt as in the case of melts of Fe – Co – Al. Further additives are aluminum leads to an increase in oxygen concentration. Areas of compounds Al2O3 , 3Al2O3·2SiO2 , Al2O3·SiO2 and SiO2 depending on aluminum and silicon contents in the melt are determined.

The distribution of phosphorus between gaseous phase and liquid oxide melt was investigated in order to determine the ability of gaseous dephosphorization of oxide melts CaO – SiO2 – MgO – Al2O3 – P2O5. The influence of different factors, such as basicity (CaO / SiO2 ) and CO / CO2 ratio in the barbotage gas, on the distribution of phosphorus between gaseous phase and liquid oxide melt was clarified during the experiments. It was observed, that the main factor infl uenced on the evaporation of phosphorus is the basicity. Under condition of low basicity (1.0 and less) gas dephosphoration of oxide melts was observed. The calculation of CaO and SiO2 activities was carried out using the regular solution model. The activity of CaO is less than activity of SiO2 when the basicity is less than 1.05, and it confi rms the ability of P2O5 replacement from CaO·P2O5 compound and as a result the gasification of phosphorus.

Ni – Si alloys are used in the manufacture of heat-resistant coatings. However, due to the fact that the production of compact specimens presents considerable difficulties are insufficient data in the literature on their mechanical properties. In this work, the manufacturing techniques Ni – Si alloys for mechanical testing, which consists in melting the alloy under pressure, cooling the alloy under pressure and pressure drop. Polished sample was made of samples with different chemical composition, their structure and microhardness were studied. As a result, the study found that by increasing silicon content up to 30 – 40 % microhardness Ni – Si alloys decreases to 5.5 – 6.0 GPa, with a further increase in the silicon content microhardness increases signifi cantly, due to the presence of the phase structure NiSi2 and Si, that have high microhardness values.

The work performed forecast estimated payment intoxication and decarbonization of cast billets in the working conditions of the heating furnace walking beam of “Oskol Metallurgical Plant” (“OEMK”) with burning of high-energy fuel. The basis of the used model is the method of statistical data processing on an array of practical steel heating furnaces for rolling. It was found that application of the model is to determine the value of waste of metal for the period of decarburization of the metal surface during the heating unit in the blanks.

A method of producing of nickel aluminide coatings, protecting steel components from high-temperature oxidation, was suggested. Lifetime of the layered coating, obtained as a result of implementation of the proposed complex process, was calculated.

Gas-flame coating were used to increase the stability and reducing heat losses through air tuyeres. The result was significantly increasing of stability experienced tuyeres and reduction of heat losses for 3.8 %. 

Based on the theoretical investigation by the variational principle of deformable body mechanics and taking into account the geometric relationships in deformation zone the new method for metal forming and power-energy parameters calculation under double-T section rolling in universal grooves was developed. Engineering formulas for calculation principal process-dependent parameters of double-T section rolling in universal grooves: spread and reduction coefficient of fl anges; contact pressure on horizontal and vertical rolls, force and torque of rolling were obtained. These formulas allow to calculate scientific evidence roll pass design and operating practices of double-T section rolling on modern universal rail-beam mill.