The article presents the results of obtaining a composite material by sintering nickel-containing raw materials mixed with carbon-containing materials, namely using coke and semi-coke. The sintering process was performed at a charge layer height of 240 mm and the temperature of the lower layer was T = 1200 °C. The results of the sieve analysis showed (a fraction of 10 mm) that the yield of a suitable composite material using coke was 68.3% and with semi-coke 67.0%. The average nickel and chromium content in the composite materials was 1.42% and 3.07%, accordingly. As a result of determining the strength characteristics of the obtained composite materials with various reducing agents by dropping from a height of 2 m onto a steel pallet, it was found that the obtained composite materials have high mechanical properties in terms of strength of 81% and 89.2%. The results of the elemental composition at the studied points and the thermal analysis of the studied composite material are presented. The mineralogical composition of the composite material is presented in the form of serpentine and nontronite, and the empty rock is made of quartz and talc. The activation energy of thermal analysis by the method of non-isothermal kinetics were calculated. The results of experiments on the production of composite materials from nickel-containing raw materials will be recommended for obtaining the optimal composition of composite materials at the stage of pilot tests and industrial development of the developed technology for processing nickel ores of the Republic of Kazakhstan. For the processing of nickel-poor nickel ores, it is of great importance to obtain optimal technological and technical and economic indicators that ensure low cost of nickel in the resulting product.

The research presented in the article is devoted to the study of the influence of phase compounds on the friability of the Fe-Si-Mn-Al complex alloy. The urgency of the problem lies in the development of technology for producing a non-scatterable alloy from manganese-containing ores and high-ash coals. The main goal of this work is to determine the range of alloy compositions and the resulting phases that affect the dispersibility of the alloy, which is critically important for its industrial implementation. Research methods include thermodynamic diagram analysis (TDA) using data on the standard enthalpy of formation of intermetallic compounds, as well as experimental tests in an ore-thermal electric furnace with a capacity of 200 kV*A. The results show that Fe-Si-Mn-Al complex alloys form a variety of silicide and aluminide phases, including intermetallic compounds and ternary systems, which is critical for understanding and controlling their physicochemical properties. When melting a complex alloy, the content of leboite (Fe₃Si₇) in the Fe-Si-Mn-Al system plays a significant role. The development of melting process technology will be aimed at avoiding the FeSi₂-Fe₃Si₇-F₂(FeAl₃Si₂)-Mn₁₁Si₁₉ tetrahedron area. This approach to controlling the composition of a complex alloy is critical to ensuring its consistent friability properties in industrial applications. Thus, this work represents an important step in understanding the physical properties and stability of Fe-Si-Mn-Al complex alloys, which have potential for widespread use in metallurgical and other industrial applications.

The research presented in the article is devoted to the study of the influence of phase compounds on the friability of the Fe-Si-Mn-Al complex alloy. The urgency of the problem lies in the development of technology for producing a non-scatterable alloy from manganese-containing ores and high-ash coals. The main goal of the work is to determine the range of alloy compositions and the resulting phases that affect the dispersibility of the alloy, which is critically important for its industrial implementation. Research methods include thermodynamic diagram analysis (TDA) using data on the standard enthalpy of formation of intermetallic compounds, as well as experimental tests in an ore-thermal electric furnace with a capacity of 200 kV*A. The results show that Fe-Si-Mn-Al complex alloys form a variety of silicide and aluminide phases, including intermetallic compounds and ternary systems, which is critical for understanding and controlling their physicochemical properties. When smelting a complex alloy, the content of leboite (Fe3Si7) in the Fe-Si-Mn-Al system plays a significant role. The development of smelting technology will be aimed at avoiding the FeSi2-Fe3Si7-F2(FeAl3Si2)-Mn11Si19 tetrahedron area. This approach to controlling the composition of a complex alloy is critical to ensuring its consistent friability properties in industrial applications. Thus, this work represents an important step in understanding the physical properties and stability of Fe-Si-Mn-Al complex alloys, which have potential for widespread use in metallurgical and other industrial applications.

The paper presents the results of thermodynamic modeling of the process of smelting a complex alloy from highly active elements Al-Mn-Ca-Si. Thermodynamic modeling was carried out using the universal program for calculating multicomponent heterogeneous systems Terra, which has its own base of thermodynamic properties of individual substances. Since the preliminary calculation based on the standard database showed that the composition of the products differed from the expected one, we took the missing thermodynamic functions of substances from the HSC Chemistry 5.1 database. Initial conditions for modeling alloy melting: temperature range 700 - 2800°C, pressure 0.1 MPa. The initial charge mixture consisted of coal from the Saryadyr deposit, manganese ore from the Yesymzhal deposit, and lime. According to the results of thermodynamic modeling, it was found that the optimal metal yield is achieved in the temperature range of 1400-2000 ° C, and for the efficiency of refining steel from non-metallic inclusions, the most acceptable composition of a complex alloy containing 20-50% silicon, 9.27% aluminum, 12-45 % manganese, 3-20% calcium, 0.01-0.5% phosphorus, 0.05-1.5% carbon and 5-20% iron. ұмыста Al-Mn-Ca-Si жоғары белсенді элементтерінен кешенді қорытпаны балқыту процесін термодинамикалық модельдеу нәтижелері келтірілген. Термодинамикалық модельдеу жеке заттардың термодинамикалық қасиеттерінің өзіндік негізіне ие көп компонентті гетерогенді жүйелерін есептеудің Terra әмбебап бағдарламасының көмегімен жүзеге асырылды. Стандартты мәліметтер базасына негізделген алдын-ала есептеу өнімнің құрамы мен күтілетін арасындағы айырмашылықты көрсеткендіктен, біз заттардың жетіспейтін термодинамикалық функцияларын HSC Chemistry 5.1 мәліметтер базасынан алдық. Қорытпаны балқытуды модельдеудің бастапқы шарттары: температура аралығы 700-2800°C, қысым 0,1 Мпа. Бастапқы шихта қоспасы Сарыадыр кен орнының көмірінен, Есімжал кен орнының марганец кені мен әктен тұрды. Термодинамикалық модельдеу нәтижелері бойынша металдың оңтайлы шығымдылығына 1400-2000°С температура диапазонында қол жеткізілетіні, ал болатты металл емес қоспалардан тазарту тиімділігі үшін құрамында 20-50% кремний, 9,27% алюминий, 12-45% марганец, 3-20% кальций, 0,01-0,5% фосфор, 0,05-1,5 көміртек және 5-20% темір бар кешенді қорытпаның құрамы қолайлы болатыны анықталды. В работе приводятся результаты термодинамического моделирования процесса выплавки комплексного сплава из высокоактивных элементов Al-Mn-Ca-Si. Термодинамическое моделирование выполнено с помощью универсальной программы расчёта многокомпонентных гетерогенных систем Terra, обладающей собственной базой термодинамических свойств индивидуальных веществ. Так как проведенный предварительный расчет на основе стандартной базы данных показал отличие состава продуктов от ожидаемого, отсутствующие термодинамические функции веществ нами были взяты из базы данных HSC Chemistry 5.1. Исходные условия для моделирования выплавки сплава: интервал температур 700 - 2800°C, давление 0,1 МПа. Исходная шихтовая смесь состояла из угля месторождения Сарыадыр, марганцевой руды месторождения Есымжал и извести. По результатам термодинамического моделирования установлено, что оптимальный выход металла достигается в диапазоне температур 1400-2000°С, а для эффективности рафинирования стали от неметаллических включений наиболее приемлемым будет состав комплексного сплава, содержащего 20-50% кремния, 9,27% алюминия, 12-45% марганца, 3-20% кальция, 0,01-0,5% фосфора, 0,05-1,5 углерода и 5-20% железа.

In Kazakhstan, there is a growing demand for oil and gas pipes and general-purpose pipes made of steels with high performance properties, high-quality blanks for mechanical engineering and structural steel for construction. The work was carried out within the framework of the Targeted Financing Program, in which, as one of the most urgent, the task was set to expand and improve the range of steel products of steel-smelting enterprises, which are in demand, first of all, in the domestic market. Some questions on microalloying with molybdenum and titanium are considered. The article presents the main results of experimental heats to obtain high-strength structural steel with titanium and molybdenum. Metallographic studies of experimental laboratory samples were carried out using an Olympus 51ВХ (TRF) light microscope. The metallographic analysis of the studied samples showed that the base steel 09G2S of the current production has a ferrite-pearlite structure. The grains have an acicular structure (the formation of polygonal ferrite) and correspond to 5-6 points. At the same time, heterogeneity is observed. The results of the study of laboratory samples alloyed with molybdenum and titanium (sample No.1 and No.2) confirm the effectiveness of the impact of microalloying elements on grain refinement, which is due to the release of a significant amount of carbonitrides of the type (MoCN, TiCN) along the grain boundaries. The microstructure of both samples consists of two well-defined phases - ferrite and pearlite, and the grain size corresponds to 7-8 points.