Boldyrev D.A., Popova L.I. On alternative ways of resource-saving scarce non-ferrous metals for alloying cast iron
It is noted that in the world markets of non-ferrous metals, due to the shortage of raw materials, political and economic instability, a situation has developed where prices have reached record levels and exceeded historical highs. The price increase in 2025 was 53% for copper and 92% for tin, meaning the use of these materials is becoming economically costly. The possibilities of using alternative ways of alloying cast iron with copper and tin for its hardening in order to reduce the consumption rates of non-ferrous metals have been worked out. 3 directions are proposed: increasing the proportion of manganese to 1%; reduction of carbon equivalent and application of normalization technology (for cast irons with vermicular and spherical graphite). The characteristic features of each of the proposed directions are shown.
Keywords:Tin, copper, manganese, appreciation, hardening, cast iron, carbon equivalent, normalization.

Malinov L.S., Malinov V.L., Lavrova E.V., Tsys E.A. Increase in abrasive wear resistance of casting high-carbon steels by non-typical hardening methods
The article presents data on increasing the abrasive wear resistance of casting high-carbon steels using non-standard hardening methods, including eco-friendly isothermal and intermittent hardening with cooling and aging according to the water-furnace (or heated sand)-air scheme. They create a multiphase structure in which, along with martensite, lower bainite, and carbides, there is a metastable austenite undergoing dynamic deformation martensitic transformation - DDMT (self-hardening effect under loading-SHL).
Keywords:Casting steels, metastable austenite, deformation martensite, effect self-hardening under loading, wear resistance.

Minenko G.N. Method for determining the effects of the modification process on Fe-C alloys
It is shown that the value of the electrical resistance of the liquid alloy before the introduction of the modifier differs significantly from the values of the electrical resistance of the alloy after the introduction of the modifier particles into the metal melt. The experimental results obtained made it possible to obtain correlation correlations of the tensile strength of Fe-C alloys on the magnitude of the change in the electrical resistance of the modified alloy. Graphical dependences of changes in the tensile strength of modified gray, high-strength cast iron and cast steel on changes in the electrical resistance of the liquid alloy are given.
Key words:Modified alloy, the electrical resistance of the alloy, the dependence of the ultimate strength of alloys on the magnitude of the change in electrical resistance.

Volkov S.Y., Gulakov A.A., Potapov M.G., Potapov I.M. Enhancement of groove life through selection of the working layer material for centrifugally cast bar mill rolls in the finishing stands
This study presents a comparative analysis of wear resistance, mechanical properties, and operational durability for materials used in the working layer of section mill rolls. The tested materials include conventional cast iron SShKhNM-55 and two promising alloys: SGA-I and High-Speed Steel (HSS). Laboratory wear tests were conducted using a pin-on-disc tribometer according to the ASTM G99-23 standard. The results demonstrate that the HSS alloy exhibits the highest wear resistance, significantly outperforming both SGA-I, which shows intermediate performance, and the traditional SShKhNM-55 cast iron. The findings recommend the application of SGA-I and HSS alloys in the finishing stands of section mills to enhance roll pass durability and reduce operational costs.
Keywords:Section mill rolls, centrifugally cast rolls, SShKhNM-55 cast iron, SGA-I alloy, high-speed steel (HSS), wear resistance, hardness, groove life, rebar rolling, finishing train, horizontal centrifugal casting, vertical centrifugal casting.

Emelyanov V.O., Kondratenko L.I., Sokolov A.V. Features of using the alpha-set-process for manufacturing artistic castings
The article discusses the features of using the Alpha-set process instead of dry sand-clay mixtures in artistic casting. This process is widely used for producing castings of various purposes, including artistic ones. It allows for high-quality surface finishes, prevents mold-related blockages, and facilitates the removal of the mixture. A technological method has been proposed to reduce the cost of molding materials. Research has been conducted on two types of quartz molding sand with different clay content. The influence of sand characteristics, the amount of regenerated filler, and the treatment of regenerated filler with water on the strength properties of the mixture has been determined. The compositions of mixtures with a high content of regenerated filler have been justified. An explanation has been provided for the mechanism of forming the strength of the mixture when regenerated filler is treated with water.
Keywords:Alpha-set process, water treatment of regenerate, strength, crumbling, quartz sands, clay component, mechanical regeneration.

Illarionov I.E., Nikitin A.V. Development of a suspension using tetraboron phosphate compounds for the manufacturing of shell molds in investment casting
Based on the obtained experimental data, the scientific and technical principles for creating suspensions based on lithium tetraboron phosphates (TBFL), sodium (TBFN) and potassium (TBPC) for the manufacture of highly efficient shell molds in investment casting have been developed. TBFL, TBFN, TBPC have been synthesized and their individuality has been confirmed by crystal optical studies. Based on the synthesized tetraboron phosphate compounds, suspensions of the following compositions have been developed, in wt.%: quartz sand – 20; clay – 4; TBFL (TBFN, TBPC) – 12…15; water - the rest up to 100. The technological advantage of tetraboron phosphate suspensions in their ability to form high-strength shells at significantly lower heat treatment temperatures (400°C) compared to ethyl silicate suspensions has been established. Analysis of experimental data has shown that the modified tetraboron phosphate suspension compositions outperform traditional ethyl silicate suspensions in bending strength by 1.5–1.9 times. The obtained data on gas formation according to GOST 23409.0-78 revealed that the introduction of TBFL, TBFN, and TBFC into the test suspension compositions leads to a decrease in gas formation by 4–5 times.
Keywords:Suspension, lithium (sodium, potassium) tetraborophosphate, density, viscosity, heat treatment, shell molds, bending strength.

Kokovin P.L., Lozin E.A., Broytman O.A., Borodin S.A., Vlasov Yu.B. Development of a digital twin of the semi-continuous casting process of aluminum alloy based on a numerical model and experimental data
The article dedicated to methodology for studying the processes of semi-continuous casting of aluminum alloys using a digital twin based on a computer model created in POLIGONSOFT casting simulation software and real-life measured data.
Keywords:Semi-continuous casting, aluminum alloys, modeling, digital twin, thermal processes, temperature measurement, flat ingot.

Volnov I.N., Khasan A., Kononikhin I.Yu. Foundry production as an organismic technology. A sphere-based approach
The development of foundry production is examined within a periodization of technological paradigms or cycles. It is demonstrated that the new scientific basis for foundry production in the 6th technological paradigm may be based not only on artificial intelligence but also on a new spherical approach, pioneered by Academician V.I. Vernadsky over 100 years ago. The spherical approach is replacing the systems approach, the excessive complexity of which is the cause of technological development inhibition. The features of the spherical approach to foundry production are presented, allowing for a completely different understanding of the casting and its formation process, namely, as a living organism. The spherical approach is fully consistent with the trends of the 6th technological paradigm toward naturalism and organicity.
Keywords:System, complexity, technological structures, casting, theory of casting formation, sphere, living, biological space and time.

Panov A.G. Cast iron: the etymology of the term as a reflection of the eastern origins of the development of domestic iron foundry production
The paper presents the results of a study of the relationship between the history of the development of technologies of domestic cast iron foundry production and the history of the origin of the term "cast iron" in the Russian language. It is shown that the history of cast iron foundry production in Russia is a complex, centuries-old process in which Eastern innovations, adapted and developed by Russian craftsmen, became the basis for the creation of a powerful domestic foundry industry. The fact that the term "cast iron" originated from the Turkic languages, which they borrowed from the Chinese language, indicates an inextricable link with Eastern technological traditions. The deep meaning of the ancient Turkic word associated with radiance, heat and flame metaphorically reflects the essence of the iron smelting process and the fiery nature of cast iron foundry production.
Keywords:Cast iron, history of technological development, etymology.

Boldyrev D.A., Popova L.I. On alternative ways of resource-saving scarce non-ferrous metals for alloying cast iron

Malinov L.S., Malinov V.L., Lavrova E.V., Tsys E.A. Increase in abrasive wear resistance of casting high-carbon steels by non-typical hardening methods

Minenko G.N. Method for determining the effects of the modification process on Fe-C alloys

Volkov S.Y., Gulakov A.A., Potapov M.G., Potapov I.M. Enhancement of groove life through selection of the working layer material for centrifugally cast bar mill rolls in the finishing stands

Emelyanov V.O., Kondratenko L.I., Sokolov A.V. Features of using the alpha-set-process for manufacturing artistic castings

Illarionov I.E., Nikitin A.V. Development of a suspension using tetraboron phosphate compounds for the manufacturing of shell molds in investment casting

Kokovin P.L., Lozin E.A., Broytman O.A., Borodin S.A., Vlasov Yu.B. Development of a digital twin of the semi-continuous casting process of aluminum alloy based on a numerical model and experimental data

Volnov I.N., Khasan A., Kononikhin I.Yu. Foundry production as an organismic technology. A sphere-based approach

Panov A.G. Cast iron: the etymology of the term as a reflection of the eastern origins of the development of domestic iron foundry production