The slag of Al2O3 – CаO system is formed during production of low-carbon ferrochrome where aluminum is used as a reducing agent. During the thermodynamic modeling of Al2O3 – CаO system, complex structures of oxide melts were calculated with the programming software TERRA in approach of the associated solution model. The thermochemical data for associate system of Al2O3 – CаO is systematized and modified. Compliance of calculated and experimental results of thermodynamic activities of individual oxides Al2O3 and CaO are shown.

Processes of magnetization (flocculation) and demagnetization (deflocculation) of products of Abagurskaya concentrating-sintering factory were investigated by digital photo technique. Both induced by the ‘external’ field flocculation and ‘own’ flocculation due to the remanent magnetization were observed as well as demagnetization process of ‘own’ flocculation. Interval of constant fields of magnetization is from 24 to 200 kA / m. The flocculi forms formed in the magnetic field due to remanent magnetization are different. No significant differences in flocculation and defloccula- tion of various factory’s products were found. The fields of 40 kA intensity might be considered optimal for magnetization and demagnetization of products. Such fields (constant and alternating) are technically possible at the factory.

The article describes the technology of vacuum degassed rail steel with the release of the furnace with a carbon content of at least 0.10 % and an additive in the production of carbonaceous material in the bucket. The introduction of technology has provided a significant reduction in oxygen levels and pollution have become lines brittle failure oxides, which will develop the production of rail products of the highest quality

In connection with the use of an uninterruptedly-casted blank in the line of a pipe-rolling plant it is appropriate to carry out blank cobbing before broaching achieving increase of the structure quality and technological properties of steel. For this goal on the TPA-80 LLC Sinarskiy Trubniy Zavod a three-high unit of screw rolling for blank cobbing was installed. In a new technological process there was a problem of defects increase due to compression marks caused by formation of a the sink mark on the back end of the material blank during cobbing and subsequent formation of semirings during broaching, their detachment to the deformation zone. The causes of sink marks formation on the pipes and rolling are investigated. The results of mathematical simulation of the process of blanks broaching on the piercing mill of screw rolling are given, recommendation for reduction of surface defects formation on the pipes during rolling on TPA-80 with cogging mill is provided.

Velocity of cooling and hardness of thin plates under strengthening by plasma hard-ening as well as its influence on structural steel strength are investigated.

The distribution character of the axial stress and the value of the stressed state ac-cording to V.L. Kolmagorov along the length of a working cone and the parallel land at different coefficients values of an external friction, metal strain hardening and back pull stress are shown. The calculation of an axial stress in the parallel land is done in accordance with well-known formulas.

In the article the stressed state of metal in the deformation zone during hot rolling of rod using the finite element method for computer simula- tion in program system DEFORM-3D are analyzed. The methodology for evaluation of the stressed state during the high-speed hot rolling of rod is presented. The known systems of calibers are analyzed. The factors of roll pass design, which influence the magnitude and distribu-tion of the longitudinal tensile stresses in the deformation zone, are determined.

Full-factor experiment of samples fragmentation made from fragile material is carried out. The influence of various factors and their interaction on the force necessary for samples fragmentation and the interconnection of these factors with magnitude of relative deformation at the fragmenta- tion is shown. The recommendations for choice of parameters for jaw crushers are given.

The use of washing pellets in the amount of 30 – 60 kg/t of pig iron in blast furnace with useful volume of 3000 m3 has contributed to the quite effective flushing of the horn and preservation of the smooth furnace operation. The estimated reduced productivity of the blast furnaces increased by 3,5 % while reducing the specific con-sumption of coke reduced by 0,69 %.

The method for testing numerical models of a two-dimensional Stefan problem using the exact solution is stated. The mathematical model and the analytical solution of the considered problem used for the testing are provided. Research results of influence of setting parameters of numerical algorithm on a modeling error are presented.

Series of studies of the analytical model development of the spot geometry of spray jet irrigation on the flat surface is completed. The method of approximate calculation of gravity and environmental resistance for estimation of spot sizes of inclined jet irrigation, accumulating both on the top and the bottom surfaces of the horizontal sheet, is described. The results can be used for the design of installations and cooling technologies and quenching of hot metal sheets by spray liquid jets.

The influence of combined use of technological additives of aluminum powder ASD-4 and alumino methyl sodium siliconate (AMSR) on strength of ethylsilicate forms is considered. The choice of optimum amount of additives is made: amount of ASD-4 is 4 % from filler mass and amount of AMSR is 2 – 3 % in addition to mass.

The formation process of the required ultrafine structure and mechanical properties of carbon steel by severe plastic deformation is formalized. Peculiarities of stochastic and statistical mathematical models application for description of the severe plastic deformation processes with different information volume about interconnection of parameters of process control and mechanical properties of carbon steels with ultrafine structure are examined. The criteria approach for evaluation of the processes effectiveness of intensive plastic deformation carbon steels.

Studies of structure, phase composition, defect substructure, irradiation morphology and fatigue fracture surfaces of rail steel treated by high intensive electron beam with energy density 10 and 20 J/sm2 are carried out by methods of scanning and transmission electron diffraction micros- copy. It is shown that the reason of fatigue life increase (in 2.5 times) after irradiation is the formation of toothed separation boundary “strengthened layer – matrix”.

By scanning, transmission electron diffraction microscopy of thin foils and measurements of microhardness were studied structural features of the phase state of the surface layers of carbon steel 45 and commercially pure titanium VT1-0 after the combined treatment including electroex- plosive boron-aluminizing and subsequent electron-beam processing. It is shown that the subsequent electron-beam treatment leads to leveling of the surface of electroexplosive boron-aluminizing. In addition, the combined treatment leads to the formation of a multiphase gradient structure, reinforced by nano- and microcrystalline particles of intermetallic borides.

In this paper we propose a mechanism of thermal processes under the influence of the flows of energy. The model takes into account the evapo- ration and melting of the target material. A mathematical problem with a change in the type of boundary condi-tions is put, a numerical model and calculation program without using the fitting parameter is developed. The equation to calculate the time of expansion of vaporized material is estab- lished. The numerical values for the penetration depth depending on the specific energy are obtained. Indicates a possibility for the parameterization of the experimental data.

Statistical analysis of tension-bending machine (TBM), which destroys the dross from the surface of the hot-rolled steel, was performed. The method of constructing of the mathematical model based on the logit-regression, which connects the load on drive with the total overlap of rollers in the TBM for the different profile of hot-rolled steel, has been proposed. The model can be used to maintain stable operation of the machine and the regulation of the load on the drive, as well as to determine the overlapping rollers, if the profile of hot rolled steel or design of the tension-bending machine is changed.