The effect of oxygen enrichment of blast on technical and economic parameters of operation of the stand and quality of lining heating has been studied on the base of the comprehensively determined mathematic model of thermal panels for heating of steel ladle linings. The enrichment of the blast with oxygen leads to saving of natural gas and increases efficiency.

Studies of defects distortion during square billets rolling in various forms of bar calibers were held in laboratory conditions. Established are qualitative and quantitative dependences between defects forming during the rolling process and the following factors: the degree of deformation, the location and spatial orientation of the defects on the initial billet. The mechanism of the influence of the shape and the size used in calibers rolling on the intensity of generation of the billet surface defects is disclosed.

Justified by the basic conditions of dispersion and division of injected two-phase flows in magnesium iron melts. It is shown that due to hydroaero modes and conditions of two-phase flow injection quantity of the interphase mass transfer surface of the melt can be increased by 40 – 50 %. Substantiates injection of magnesium in hot metal a lance with a lot of nozzles providing a better learning and increase its flow rate of magnesium in the melt.

In making balls for ball mils the metal is deformed in rolling balls in rolls with helical pass grooves. Insofar as the character of the deformation is concerned, the pass can be divided into the forming section, where the rolls bite the billet and reduce it gradually into the ball shape, and the finishing section where the ball is rolled to the final size and severed from the rest of the billet. A normal process of rolling is provided for by designing the forming section of the pass groove. In the article outcomes calculation roll pass design for rolling of balls. Calculation is made for roiling of ball of125 mm. Initial data for ball-rolling mill design are given.

The new method of lump coal charging through the throat is developed and implemented, it allows to form rational profile of the charge layer and ensure smooth forced progress of blast furnace with working volume of 3000 m3. Use of lump coal in the charge for partial replacement of coke up to 15 % contributed to reduction of actual and estimated values of coke consumption by 4,4 − 7,5 and 2,8 − 9,7 %, respectively, and increased productivity by 4,1 − 3,8 and 4,4 − 7,5 %, while maintaining the quality of cast iron.

The characteristic of the mathematical model is presented, allowing to size up location and form of zone of viscous-plastic masses of iron-ore materials (plastic zone) in blast furnace, to carry out diagnostic of its rational configuration based on really accessible information on working blast furnace for the base period, and to solve complexity of problems for the design period with change in operating conditions of melting. Results of modeling for the base and the design periods are given.

Research and development of highly effi cient methods of shaping that enhance the quality of castings, such as pulse compression and process
equipment for its realization.

Investigation of the effect of metal modifying with nanopowder materials on the quality of rectangular continuously cast billets, structural shapes and reinforcing bar showed that the introduction of TiCхNy – Fe admixture in tundish ladle of continuous casting machine reduces segregation of elements in the ingot and pollution by non-metallic inclusions, increases its chemical and structural homogeneity. NPI application alters the structure of shapes and rebar; shape, size and topography of the location of non-metallic inclusions; as well as grain refining and improvement of the metalroll mechanical properties.

The article shows the results of chill casting of lead-antimony alloy with established first heat pipe in it. Thickness of crusts and the formation of the alloy casting are obtained. From the condition of equality of the defining criteria of Fo (Fourier) and Ko (Kossovich) similarities time needed for chill cast, the surface temperature of heat pipe and walls of chill mold are found for the field conditions.

The simulation of the heating of the surface of metals and alloys during the treatment by multi-phase pulsed plasma jet formed from the products of explosion of electrical conductors is held. The depth of the melting zone was determined for the two pulse shapes – rectangular, and bimodal, which corresponds to the structure of the jet, including rapid plasma front and relatively slow rear containing condensed particles of the explosion products. Comparison of the simulation results showed that the pulse shape has little effect on the depth of the alloying zone.

The elctropulsing treatment (EPT) has been successfully applied to the processing of a low carbon Q235 steel strip. Comparing with the conventional heat treatment (CHT), a proper EPT is capable of achieving the similar or even better effect on the mechanical properties of the steel strip. It was found that the optimum combination of the EPT parameters are 180 V in voltage and 500 Hz in frequency (180 V – 500 Hz) leading to a combination of tensile strength-elongation of 371 MPa – 47,5 %. Optical microscopy analyses indicates that the EPT/180 V – 500 Hz for Q235 steel strip can accelerate the formation of the completely recrystallized microstructure in which the grain size become relatively finer and more uniform compared to the elongated one formed in the cold-rolled sample. Such phenomenon is consistent with the improvement of the mechanical performance of the Q235 steel sample under the EPT. However, the EPT with inadequate frequency can only result in partial recrystallization of the grains, while the one with an exceed frequency may lead to the apparent grain growth within the sample. Both cases can not produce satisfactory combination of strength and ductility for the steel samples.

The paper displays the results of experimental research of nanostructuring of a surface layer of titanium carbide – nickel sintered alloy at electron-beam exposure of its surface. Data on characteristics of nanostructuring of a surface layer of metal ceramic alloy exposed to electron beam of plasma gas discharge containing argon (argon and nitrogen) and (xenon and nitrogen and their influence on friction coefficient on the surface of metal ceramic alloy and wear resistant properties of metal ceramic plates during cutting are given.

The structures of plasma coatings after electromechanical treatment (EMT) are studied by scanning probe microscopy on the example of PRFBH6-2 and R6M5 coatings. The results obtained indicate that ultra- and nanoscale strengthening phase are formed and fixed in the coating structure after EMT. The allocation of such phases at decay of the initial coating structure during rapidly high-speed temperature-force action occurs. The classification and the analysis of the formation mechanisms of coatings specific structural zones, strengthened by nano- and ultrafine particles in different ratios and defined by parameters of spray powder, regimes of plasma spraying and EMT are researched.

The results of analysis of crystal structures in the Ti – Al – C and Ti – Si – C systems and experimental investigations of VT6 alloy and silumin eutectoid composition Al – 12 % Si, subjected to electroexplosive alloying and electron-beam treatment, have been studied. Formation of MAX-phases Ti3SiC2 and Ti3AlC has been revealed in modified layer by the X-ray diffraction methods.

The influence of the ratio of axial and angular velocities of deformation on the stress state of samples under torsion combined with tension (compression) is shown. The technique of metal plasticity estimation based on the sample test by means of torsion combined with tension (compression) is proposed.

The low-stability states and structural peculiarities in the phase transition area of the Cu3Au binary alloy are investigated. The thermal reconstruction characteristics of the binary alloy in case of its stoichiometric composition deviation were revealed on the micro, nano and macro structural scales. It is shown that in the vicinity of the structural phase transition of the Cu3Au alloy at the 25 at. % Au domain the low-stability states arise which exhibits the whole range of abnormal phenomena responsible for the system transformation inducement.

The elctropulsing treatment (EPT) has been successfully applied to the processing of a low carbon Q235 steel strip. Comparing with the con- ventional heat treatment (CHT), a proper EPT is capable of achieving the similar or even better effect on the mechanical properties of the steel strip. It was found that the optimum combination of the EPT parameters are 180 V in voltage and 500 Hz in frequency (180 V – 500 Hz) leading to a combination of tensile strength-elongation of 371 MPa – 47,5 %. Optical microscopy analyses indicates that the EPT/180 V – 500 Hz for Q235 steel strip can accelerate the formation of the completely recrystallized microstructure in which the grain size become relatively finer and more uniform compared to the elongated one formed in the cold-rolled sample. Such phenomenon is consistent with the improvement of the mechanical performance of the Q235 steel sample under the EPT. However, the EPT with inadequate frequency can only result in partial recrystallization of the grains, while the one with an exceed frequency may lead to the apparent grain growth within the sample. Both cases can not produce satisfactory combination of strength and ductility for the steel samples.