Теорія і практика металургії (ДМетІ)

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ENG: Theory and practice of metallurgy, Institute of Industrial and Business Technologies (DMetI)

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Adjusting Properties of Electrode Pitch with Fractions of Coal Tar
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Starovoyt, Anatoly; Malyi, E.; Sorokin, E.; Starovoyt, Maria; Popova, O.
ENG: The paper presents the investigation results of the organic mass modification of the impregnating pitch of coal tar with low pyrolysis degree. The processes that form the pitch operational properties in the impregnation technology of graphitized electrodes were studied. Specific features of the modifying additive effect on the quality characteristics of the pitch and its group composition were established. Such technological approach makes it possible to intensify the impregnation process of blanks for graphitized electrodes.
Analysis of the Mechanism for the Occurrence of a Functional Response during Plastic Deformation of Metals and Their Alloys
(National Metallurgical Academy of Ukraine, Dnipro, 2023) Kuznetsow, E. V.
ENG: Purpose. Perfection the method for designing technological operations of metal pressure processing by establishing a functional connection between the parameters of force action and the characteristics of the natural deformation behavior of workpieces during their shape forming process. Methodology. A combined analytical approach, which is based on a synthesis of the results of fundamental and applied research in the field of physics of deformable solids, metal forming technology, as well as in related fields of natural science, is used. Findings. It is shown that the nature of the adaptive functional response of metals and their alloys to deforming influence is determined by the magnitude of possible changes in the thermodynamic potentials of the disturbed volume of the substance. From a technological point of view the most favorable response occurs when the deforming influence on the workpiece is carried out taking into account the natural ability of its substance to relaxation. Originality. The functional relationship between changes in the thermodynamic potentials of the volume of a metal or alloy and its adaptive behavior during the deformation process, as well as in the postoperative period, is described. Practical value. The findings make it possible to optimize the technological processes of machining of metals and their alloys by pressure, taking into account the natural properties and behavioral characteristics of each concrete material under concrete production conditions.
Calculation and Analytical Method for Determining the Force Parameters of a Crank-Slider Mechanism (Message 2. Kinetostatics)
(National Metallurgical Academy of Ukraine, Dnipro, 2023) Dobrov, Ihor V.; Semichev, Andrii V.; Pavlenko, O. M.
ENG: The purpose of the work is to develop an algorithm and a program for calculating the power parameters of the crank-slider mechanism, taking into account the proven in practice and well -recommended: analytical method of calculating the kinematics of the slider and the graph-analytical method of calculating the power parameters of the crank-slider mechanism. Research results. The new calculation method and an algorithm for determining the force parameters of the crank-slider mechanism. Scientific novelty. The new method for the analysis of force parameters of a crank –slider mechanism, which differs from the existing methods of graph-analytical and analytical methods by the use of a new calculation-analytical method of determining the linear and angular accelerations of each link of the mechanism for solving the kinetostatic equations of the mechanism as a whole. Practical value. The created algorithm makes it possible to perform a preliminary assessment of the force parameters of mechanisms and aggregates using crank-slider mechanisms at the stage of technological design, technical and economic calculation of new aggregates or modernization of existing equipment when changing technological regimes related with the production of modern competitive products, in particular, for the production of seamless pipes on mills with rollers for cold rolling of pipes.
Coordinated Control of the Composition of 01yut Steel and Deformation Processing Modes to Achieve Specified Mechanical Properties
(National Metallurgical Academy of Ukraine, Ukrainian State University of Science and Technologies, Dnipro, 2024) Velychko, A. G.; Kamkin, V. Yu.; Proidak, Yurii S.
ENG: Purpose: to investigate the influence of the chemical composition of steel on the output from the chipboard and to establish rational parameters of deoxidation and deformation to ensure the specified values of mechanical properties. Methods: physicochemical modeling, thermodynamic calculations, experimental studies. Results: the carbon content and the degree of oxidation of the semi-finished product from the electric furnace for further vacuum treatment to obtain low-carbon steel were determined. With an increase in the oxygen flow rate supplied to the chipboard and exceeding the value required for the stoichiometry of fuel combustion reactions, the oxidation of the semi-finished product increases. To avoid the formation of calcium silicates, it is necessary to have an active oxygen content below 2.5 ppm, which is ensured by the residual content of dissolved aluminum in steel of 0.025-0.027%. Scientific novelty: The use of complex deoxidizers in steel production allows using the synergistic effect of the joint deoxidizing action of deoxidizing elements. The use of the methodology of physicochemical modeling made it possible to effectively solve the problem of predicting the properties of steel. To study the influence of modifier elements, as well as the main alloying components, a number of parameters characterizing the state of the alloy as a whole (Zу, d) were calculated. Based on information on the significant influence of the chemical composition of the steel on its properties, a database of 150 compositions was prepared to determine the optimal composition of ultra-low-carbon steels of the 01ЮТ, 01ЮТА type by the method of physicochemical modeling. Based on the calculations, the concentrations of elements for steels of the 01ЮТ and 01ЮТА grades were selected.
Determination of Residual Stresses in the Production of Welded Pipes by Magnetic Memory
(НМетАУ, Дніпро, 2023) Savkyn, S. V.; Balakin, Valerii F.
ENG: The article proposes the use of the metal magnetic memory method for the purpose of detecting and measuring residual stresses in welded seams and heat-affected zones of longitudinal welded pipes. The experimental study was divided into the following stages: measurement of residual stresses in the weld section of a pipe that has not undergone heat treatment; measurement of residual stresses in the weld section of the heat-treated pipe; analysis of the results obtained. The measurements were carried out in the cross section of the samples, which made it possible to obtain data on the residual stresses contained in the weld, the near-weld zone and the base metal of the pipe. The study confirmed the feasibility of using the metal magnetic memory method to measure residual stresses in welded pipes for further development and modernization of the technological process for the production of longitudinal welded pipes.
Improved Heat-Insulating Products for Ingot Hot-Tops in Molds without Extensions
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Akreiev, V.; Cherenkov, D.; Prykhodko, S.; Melnyk, S.; Ovcharuk, Anatolii M.
ENG: The fundamental principle of proper ingot solidification in metal molds - hop top part of ingot should cool and solidify slowly than the ingot body. To achieve this, typically hop top parts of ingots are insulated with special thermal insulation products. They are mounted either directly on the inner surface of the mold or installed in special hop top extensions of the mold. This approach effectively directs shrinkage defects away from the usable ingot section into hop top cut zone. For different steel grades (alloys), depending of the application, ingot design, and casting method, hop top cut ranges from 8% to 16% of the total ingot mass. This article presents experience in using an advanced thermal insulation insert design, which enables higher part of usable ingot metal, prevents subhead cracks in the ingot, simplify and lighten the lining of ingot hop top.
Improvement of Quality and Improvement of Technology of Production of Economic Alloyed Steels for Power Engineering
(НМетАУ, Дніпро, 2021) Proidak, Yurii S.; Pidhоrnyi, Serhii; Tregubenko, Gennady; Polyakov, G.; Pidyash, Lyubov
ENG: Purpose. Investigate the effect of complex microalloying with nitrogen, titanium and aluminum on the structure and properties of cast steels at elevated temperatures. Methodology. Methods of optical microscopy were used for metallographic analysis of the microstructure of steels. The mechanical properties at room and elevated temperatures were determined for static tension, crease and impact bending. Results. The technology of carbonitride strengthening of silicon-manganese production steels has passed pilot testing. The results of mechanical tests indicate a favorable complex effect of nitrogen, titanium and aluminum on the properties of 20GSL steel in the entire range of operating temperatures. Scientific novelty. For the first time, the effect of nano-dispersed carbonitride phases (TiN, AlN) on the mechanical properties of low-alloy silicon-manganese steel of the GSL type at elevated temperatures (250-4500C) has been investigated. Practical value. The use of carbonitride technology for strengthening silicon-manganese heat-resistant electric steel provides an increase in operational reliability, an increase in the service life and reduce the metal consumption of equipment for power engineering.
On the 100th Anniversary of the Department of Electrometallurgy
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Sykhoy, K. M.; Proidak, Yurii S.
ENG: The article reflects the origin and development of the electrometallurgical industry in Ukraine. The emphasis is placed on the role of the Department of Electrometallurgy at the Dnipro Metallurgical Institute in this process. The Department of Electrometallurgy was established in 1925. This was facilitated by the leading role of scientists, professors, doctors of technical sciences Telnyi S. I., Khytryk S. I., Hasyk M. I., who made a significant contribution to the development of the electrometallurgical industry in Ukraine and the training of highly qualified specialists. In the article, the key stages of formation and development of electrometallurgy have been outlined, and the crucial role of scientists and teachers of the Department has been stated.
Oxygen Distribution between Phases during Ladle Processing of Aluminum Killed Bof Steels
(НМетАУ, Дніпро, 2021) Boychenko, Serhii; Kirilenko, Yana; Stoianov, Oleksander M.; Niziaiev, Kostiantyn H.; Synehin, Yevgen V.; Sukhovetskyi, Serhii V.
ENG: The modern state of secondary metallurgy is characterized by the sustainable development of technologies that ensure high metal quality by reducing the number of non-metallic inclusions, the which is closely related to the oxygen content in steel after smelting. Therefore, the issues of regularities of oxygen distribution between phases at the stage, BOF - CCM. Purpose. The aim of the research was to determine the conditions of redistribution of oxygen dissolved in the metal depending on the stages of steel processing, to determine the degree of approach of deoxidation processes to thermodynamic equilibrium. Methodology. Research was carried out in industrial scale. Steel grades 34Cr and 36CrB were smelted in BOF of 170–t capacity. Processing of crude steel was carried out in a LF unit with further vacuum degassing and without it and transfer of steel to CCM. At each stage of steel treatment, metal and slag samples were taken using an automatic sampler to determine the chemical composition, and the temperature. Oxygen content were monitored using a "Celox" analyzer. Findings. The carried-out studies showed that before the end of metal processing in the ladle, it is possible to detect individual reoxidation processes caused by unwanted ingress of oxygen from the air and from ladle slag oxides. According to calculations, in the second half of processing in the ladle and during casting, there is a slight deoxidation of steel with aluminum due to a decrease in temperature. Even if during this time due to the exchange reaction between steel and slag, a small amount of Mn and Si is recovered from the ladle slag, while its composition is practically constant throughout the period of steel processing in the ladle, while the metallurgical reactions proceed in the region of thermodynamic equilibrium. Originality. It has been determined that oxygen activity in steel varies unevenly over time and decreases to 3 ppm by the end of treatment in the ladle. While in each case it is in the Fe – a[O] – Al system near the calculated values of thermodynamic equilibrium. Practical value. The use of the obtained regularities makes it possible to obtain the specified content of aluminum in steel for the studied assortment and to predict the burning of deoxidizers and alloying elements, ensuring the reliability of obtaining the required chemical composition of steel with a high degree of purity.
Physical and Chemical Audits and Comparative Analyses of Scrap Remelting Technology Indicators for High-Alloyed Steel with Special Purposes Using the Duplex-Slag Process and the Resource-Saving Mono-Slag Process
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Projdak, Yurii S.; Gorobets, A. P.; Zhadanos, Oleksandr V.; Kamkina, Liudmyla V.; Yaroshenko, Y. O.
ENG: The goal. The research purpose is a physicochemical audit and comparative analysis of the indicators of the technologies for remelting scrap of high-alloy special-purpose steels using a two-slag process and a resource-efficient single-slag process to create an innovative technology for the electric steelmaking process. Methodology. The research used miscellaneous methods and modern equipment for studying the physical chemistry of metallurgical processes, including optical metallography methods on the “Neophot-24” installation, to assess the microstructure of the metal and the mineralogical composition of the slags. Experimental and industrial smelting was carried out to determine the balance of alloying elements by certified chemical and spectral analysis of the metal and slag. Results and scientific novelty. To ensure the rational composition of the slag of reduced basicity during melting, a mixture with the following composition was synthesized from oxides classified as "chemically pure": 50%СаО-35%SiO2-5%Al2O3-5%MgO-5%FeO. This allows for the reduction of the loss of alloying elements and increases the efficiency of remelting. According to the results of the analysis conducted by the requirements of DSTU 8966:2019 regarding the contamination of the metal with non-metallic inclusions and their crystalline and chemical composition, it was found that the vast majority of inclusions are represented by silicates with a size of 7-10 μm. These indicators depend on the size and conditions of crystallization of the ingot. Changes in the content of alloying elements due to the remelting process were analyzed. It was confirmed that the losses of expensive alloying elements (Cr, Mo, W, V) depend not only on their chemical affinity for oxygen but also on the formation of compounds of the type СаО*МеО in the slag, where МеО oxide has an acidic nature of interaction. New knowledge has been obtained regarding the physical properties and phase composition of lime-iron slag of the CrO-FeO-SiO2-(Ме)O system where Me-Mn, Cr, V, Mo. The obtained scientific results significantly complement the research of domestic and foreign scientists due to the novelty of the approach and practical orientation to the needs of specific industries. Practical value. The developed technological solutions for predicting the optimal composition of the metal dump for metal scraps of alloyed special-purpose steels will increase the technical and economic performance of steelmaking in electric furnaces and promote the reuse of valuable materials. This is important in the context of the constant increase in the cost of raw materials and efforts aimed at reducing the impact on the environment, as well as on the sustainable development of Ukraine (solving environmental problems, reducing greenhouse gas emissions, reducing the consumption of ferroalloys, etc.).
Physico-Chemical Justification and Experimental Verification of a Waste-Free Method of Oxidative Dephosphorization of a High-Phosphorus Manganese Alloy
(National Metallurgical Academy of Ukraine, Ukrainian State University of Science and Technologies, Dnipro, 2024) Kamkina, Liudmyla V.; Velychko, K. A.; Velychko, A. G.; Jiang, Zhouhua
ENG: The purpose of the study: physicochemical justification of the process conditions and development of a rational algorithm for a single-stage waste-free method of oxidative dephosphorization of a high-phosphorus manganese alloy. Methods: thermodynamic analysis of the main reactions during oxidative refining of manganese alloys with a high phosphorus content. Experimental verification of the main stages of refining. Results: The physicochemical essence of the refining process of a high-phosphorus manganese alloy, which consists in creating conditions for oxidation in the alloy of manganese, carbon and silicon, is considered. The thermodynamic forecast of the course of reactions under the given conditions of oxidative refining of the associated metal confirms the possibility of obtaining three products: low-phosphorus manganese slag, ferric melt and phosphorus-containing slag with a phosphorus oxide content of 18-20% (phosphorus fertilizer). Scientific novelty: Based on the results of high-temperature mathematical modeling, it was established that the most rational oxygen consumption, which ensures the achievement of the tasks, is ~ 13 m3. As an oxidant, it is advisable to use oxygen blown by air, which is introduced into the converter bath using an inflatable nozzle from above. In this case, the total air consumption per 100 kg of alloy should be about 50 m3. Practical value: In the work, based on the thermodynamic forecast of the behavior of the elements of the accompanying alloy in oxidizing conditions, assessment of the thermal side of the process and further experimental verification, results were obtained that confirm the possibility of creating a waste-free technological scheme for refining a high-phosphorus alloy. In this case, it is advisable to carry out the refining of the alloy in conditions close to the conditions of modern production of low-phosphorus manganese slag, in which the temperature of the accompanying alloy is 1320...1350°C.
Promising Metal-Thermal Technologies for Titanium Production
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Ignatiev, Volodymyr S.; Holovachоv, Artem M.; Kolbin, Mykola O.; Yaroshenko, Ya. O.
ENG: This review discusses existing and new titanium production technologies, their advantages and disadvantages. The current global production of titanium metal is based on the production of titanium sponge by reducing titanium tetrachloride with liquid magnesium and then purifying it by electric arc remelting (Kroll's metallothermal method). The Kroll method has some disadvantages: periodicity of the process, low speed, and high cost of raw materials. The paper analyzes a number of fundamentally new technological schemes for titanium production: magnetism in salt melts; magnetism in a liquefied layer of magnesium particles (TIRO process); sodium jet thermionic (Armstrong process); steam process. In the near future, we can expect a breakthrough in titanium technology that will reduce its cost.
Regularities of Solid-Phase Reduction of Iron Oxides under Conditions of Combined Chemical-Catalytic and Energetic Influence
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Grishin, Oleksandr M.; Projdak, Yurii S.
ENG: Purpose. The purpose of the work is a physicochemical analysis of the intensification of the process of solid-phase iron reduction under the conditions of the joint influence of catalytic additives and an electromagnetic field (EMF). Methodology. The experiments were conducted in an alternating magnetic field with a frequency from industrial to ultrasonic using the thermogravimetric method. The process of reduction of various iron ore materials was studied in the temperature range of 873-1373 К Results. The results of laboratory experiments indicate the influence of the electromagnetic field and intensifying catalytic additives on the process of solid-phase reduction of various iron ore materials. The non-additivity of the results of the joint influence of additives and an intensifying EMF is shown. The study of the influence of various process parameters on the rate and degree of reduction of iron ore materials is carried out. Scientific novelty. The joint intensifying effect of catalytic additives and EMF on the process of solid-phase iron reduction is experimentally shown. A physicochemical justification of the non-additivity of the joint influence on the kinetics of the reduction process is proposed. Practical significance. Intensification of the processes of solid-phase reduction of iron ore raw materials provides a significant increase in the productivity of direct iron production technologies - process intensification and process productivity.
Regulation of Carbon and Phosphorus Content in Manganese Alloys when Processed in an Oxidizing Gas Environment or Oxide System
(Ukrainian State University of Science and Technologies, Dnipro, 2024) Velychko, K. A.; Mianovska, Ya. V.; Kamkina, Liudmyla V.
ENG: Purpose: Determination of rational methods for reducing the carbon and phosphorus content in manganese alloys. Research methodology: thermodynamic calculations and experimental studies of decarburization and dephosphorization of a high-phosphorus manganese alloy. Research materials: As a high-carbon ferromanganese with a high phosphorus content, an associated metal (manganese alloy) obtained during the production of low-phosphorus slag at the Nikopol Ferroalloy Plant was used. Rolling scale was used as an oxidant (composition, wt. %: FeO – 59.5; Fe3O4 – 38.9). Research results: The features of dephosphorization of manganese alloys were considered. According to the adopted “classical” technology, a useful product of dephosphorization of manganese concentrates is manganese slag with a low phosphorus content. Oxidation of phosphorus dissolved in the metal can occur as a result of its interaction with oxygen in the gas phase, while the oxidation of this slag, the higher its basicity, the greater the probability of phosphorus oxidation. Considering the basicity of the slag, the higher the FeO content in it, the better the conditions for removing phosphorus from the metal. The process of dephosphorization of the associated metal includes the oxidation of phosphorus, the binding of phosphorus oxide into strong compounds (phosphates) and their transition to the slag phase. Scientific novelty: The composition of the associated metal includes silicon, which has a much higher affinity for oxygen than phosphorus; Then, naturally, it will first be oxidized with the formation of silicon oxide with a melting point much higher than the temperature of experimental studies. Practical significance: The results obtained show that when oxidizing the associated metal with iron scale at a specific consumption of 114 kg/t of metal, the total degree of extraction: silicon 88.16%, phosphorus 71.03%. At the same time, the manganese content in the metal decreased by 6.48% due to the reduction of rolling scale.
Research into the Possibility of Producing Ferrosilicoaluminum from Recycled Materials
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Taran, O.; Ovcharuk, Anatolii M.; Maliy, E.
ENG: The technology of electrothermal production of ferrosilicoaluminum using recyclable material from abrasive production has been developed, studied and tested in laboratory and semi-industrial conditions. The following were used as burden components: "old charge" from silicon carbide production, sludge from abrasive electrocorundum and silicon carbide, magnetic fraction from electrocorundum production and gas coal. As a result, an alloy containing 61−69% Al+Si was obtained.
Research of the Ore Reducing Furnaces Electrical Modes for Ferronicel Production
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Shevchenko, D. V.; Ovcharuk, Anatolii N.; Gladkih, V. A.; Bezugliy, Anatolii V.; Nikolenko, Anatolii V.
ENG: The paper presents the results of a study of the electrical modes of ferronickel furnaces OTF-1 and OTF-2 at the Pobuzhsky ferronickel plant. It was found that the furnaces operate in arcless mode. An asymmetrical voltage mode is observed: electrode casing - under, which indicates an unbalanced mode of the furnace. As a result of measurements, a significant transfer of power was detected in the area of the electrical circuit of the 4th, 5th, 6th electrodes. An analysis of the electrical mode of a 48 MVA round ferronickel furnace in the city of Hua-Hua (China) showed that the use of a furnace transformer without a voltage booster and an autotransformer makes it possible to provide the necessary electrical mode of ferronickel furnaces. An analysis of the electrical mode of a 90 MVA round ferronickel furnace in Guatemala showed the possibility of operating these furnaces in a combined mode, i.e. in the presence of an electric arc, which is controlled by the resistance of the electrodes and the power ratio in the electric arc and slag.
Research on the Properties of Ferronickel Production Slags and Development of Technological Schemes for their Enrichment
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Shevchenko, D.; Ovcharuk, Anatolii M.; Nadtochii, Anzhela A.; Prykhodko, S.; Shutov, V.
ENG: Objective. Determination of the physicochemical properties of slags, phase composition, and forms of nickel presence in them, development of enrichment modes and equipment parameters. Research Methods and Equipment. X-ray spectral microanalysis (RSMA) on the SELMI REM-106I installation was used to determine the distribution of nickel between the metallic and oxide phases in the presented slag samples. Dry and wet gravity and magnetic separation using modernized magnetic separators established the possibility of slag enrichment and the distribution of nickel between the enrichment products. Research Results. This work has conducted research on the gravitational-magnetic separation of electro-furnace and refining slags of ferronickel production in the conditions of the Pobuzhsky ferronickel plant. The efficiency of implementing the developed technological schemes in production was shown, providing additional extraction in the amount of 119 tons or 9.8% of the total annual nickel production at the plant. Slag samples were ground in experimental ball mills to fractions of –0.16; 0.16÷1.6 and +1.6 mm and subjected to enrichment by gravity and magnetic separators with a magnetic induction on the drum surface of 0.3-0.6 T (Tesla) of the MBS-300 and MS-500 types with a total metal phase yield of up to 30%. Scientific Novelty. RSMA established that nickel, both in electric furnace granulated slags and in refining slags, is in the metallic phase and is represented by metal nuggets in combination with iron of various shapes and sizes. Enrichment of electric furnace and refining slags by a combined method using a high-intensity magnetic field will allow obtaining a metal concentrate containing 0.9-38% nickel. The combined enrichment method using high-intensity magnetic separators is one of the most promising for enriching both primary mineral raw materials and secondary materials of ferrous and non-ferrous metal production. Practical Significance. The developed and proposed for implementation technological schemes for enrichment of electric furnace slags using the “wet” technology and refining slags using the “dry” technology allow for the utilization of about 1200 tons of nickel per year or the extraction of 31.6% and 94.65% of nickel from slags, respectively.
Roll Drive Mechanism with Planetary Gearbox for Cold Pilger Pipe Rolling Mills
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Danchenko, V. M.; Dobrov, Ihor V.; Semichev, Andrii V.
ENG: Purpose. Creation and study of a roll drive mechanism with a planetary gearbox, which will ensure a reduction in axial forces in the production of thin-walled pipes and it will expand the range of pipes obtained on cold pilger rolling mills. Methodology. The work includes research on determining the parameters of the roll drive of cold pilger rolling mills using the graph-analytical method of studying the kinematics of mechanisms. Results. The roll drive mechanism with a planetary gearbox will ensure regulation of the angular speed of rotation of the rolls and a reduction in axial forces. Scientific novelty. The influence of the geometric parameters of the roll drive on the value of the angular speed of the rolls, which ensure a reduction in axial forces, has been determined. Practical significance. The roll drive mechanism with a planetary gearbox allows obtaining high-quality thin-walled pipes with the possibility of expanding the range.
Ukrainian Steel and Ferroalloys in 2022-2024: How Russian Aggression Has Impacted on the Work of the Country's Metallurgical Industry
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Gryshchenko, S. G.; Proydak, Yurii S.; Ponomarennko, R. V.; Kravchenko, А. P.; Kalenkov, O. F.; Kudryavtsev, S. L.
ENG: In April 2025, the centennial of the establishment of the Department of Electrometallurgy of the Ukrainian State University of Science and Technology (at the time of its establishment - the Dnipropetrovsk Metallurgical Institute) will be celebrated. It will not be an exaggeration to say that it was the Department of Electrometallurgy, for many of us - the "alma mater", that became the founder of the world-famous school of Ukrainian electrometallurgy, the educator of a galaxy of many thousands of ferroalloy and electric steelmakers who held and hold leading positions at industry enterprises, the developer of many highly efficient technological processes of world class. Congratulating our native department on its anniversary, we sincerely wish to continue to firmly hold the banner of domestic electrometallurgical science in our hands, which is especially important now, in the difficult conditions in which the metallurgical industry of Ukraine found itself with the beginning of large-scale Russian aggression in February 2022. The Ukrainian metallurgy, taking into account the acceleration of Ukraine's European integration with the EU: on June 23, 2022, Ukraine acquired the status of a candidate for membership in the European Union and now we will have to accelerate reforms in order, including in the environmental sphere, to truly enter the European family Maintaining and developing ties with the world metallurgical and ferroalloy community, Ukrainian metallurgists will continue to look for ways to stabilize the situation, first of all - to stop Russian aggression, and in this regard we count on the active assistance and support of our foreign colleagues.
Vibration Characteristics and Dynamic Control of Vacuum Treatment
(National Metallurgical Academy of Ukraine, Ukrainian State University of Science and Technologies, Dnipro, 2023) Velychko, A. G.; Sukhyi, Kostyantyn M.; Jiang, Zhouhua
ENG: Vibration characteristics of vacuum treatment at industrial steel vacuumisation units are studied. The amplitudefrequency spectrum and the main sources of vibration of vacuum treatment units are analysed. It is shown that the vibration spectrum is dominated by low and high frequency ranges. In the low-frequency range the vibration of vacuum treatment units is connected with bath oscillations and wave formation on the surface, as well as with decarburisation of metal during oxygen blowing and vacuum-carbon deoxidation and degassing processes. In the high-frequency region the sources of vibration are pulsations of vented gases. Correlation relations between vibration and technological parameters of vacuum treatment are established. Possibilities of vibration method for dynamic control of vacuum treatment are shown. The character of vibration signal level change at the frequency of 8 Hz reflects the dynamics of decarburisation during oxygen blowing of metal at reduced pressure. In the established frequency ranges the vibration characteristics allow to control the processes of vacuum-carbon deoxidation and degassing.

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