The article considers the possibilities of using decarbonization technologies in the production of steel products. The world experience of using advanced technologies is generalized and the possibilities of their application in metallurgical production are presented, taking into account the emissions of carbon dioxide responsible for the greenhouse effect and global warming of the Earth. The directions of research projects in the metallurgical industry, the results and the conclusions that follow from them are presented. Possibilities of application of decarbonization technologies in the process of preparation of charge materials, production of cast iron and steel are shown. It is noted that the trend of decarbonization of steel significantly changes traditional metallurgy. At the same time, the possibilities of modern technologies of metal production do not allow to significantly abandon the use of natural gas and carbon (coal and coke) as a reducing agent and energy source in metallurgical production processes. Possibilities of modern and perspective metallurgical processes concerning production of products with the minimum carbon trace are shown. The problems facing the metallurgy of Ukraine to reduce СО2 emissions and the introduction of technologies for decarbonization of metal production are highlighted. It is shown that for the implementation of steel decarbonization processes it is necessary to take into account the following: the need for structural restructuring of the metallurgical industry; the need for radical modernization of the metallurgical industry through the introduction of fundamentally new energy-saving production technologies; limiting inefficient exports of raw materials and semi-finished products; introduction of "green" steel production technologies; strengthening the role of research in the production of metallurgical products with low carbon footprint; strengthening the interaction of science, enterprises and the state in the implementation of global projects for the production of low-carbon metallurgical products.

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In recent years more and more actively work has been carried out in the direction of decarbonization of metallurgical processes as part of an active «green» campaign to reduce energy intensity and harmful emissions. Metallurgy of the future is increasingly called hydrogen. The article presents an analysis of the main promising directions of the transition of the world ferrous metallurgy to waste-free and environmentally friendly technologies, carbon neutrality and the maximum reduction of greenhouse gas emissions. The advantages and problems of «green» steel production are analyzed. An overview of pilot projects for the transition to carbon-free steel production at the world's largest metallurgical plants by using hydrogen instead of fossil fuels is given. The advantages and problems of using «gray», «green» and «blue» «carbon-neutral» hydrogen are analyzed. It is shown how the ideas about the role of hydrogen as a reducing agent in the blast furnace process were deepened and refined in the historical context in accordance with changes in the technology of blast furnace smelting and the contribution of ISI scientists to these studies. The main directions of modern developments in the field of decarbonization of metallurgical processes are given. The most promising are two areas of obtaining «green steel» currently - the injection of hydrogen into a blast furnace and the process of direct reduction of iron using hydrogen instead of fossil fuel. Investigations to determine the physicochemical regularities of the reduction processes in a blast furnace with the participation of hydrogen continue at the ISI at the present time. The results of laboratory studies of the influence of a reducing gas with a variable hydrogen content on the nature of the reduction of agglomerate and pellets in the «dry» zone of a blast furnace are presented.

The study was performed on alloys with a carbon content of 0,37-0,57 % (wt.), silicon 0,23-0,29 % (wt.), manganese 0,7-0,86 % (wt.), the rest– iron. To determine the phase composition of alloys used microstructural, microanalysis and X-ray analysis. In addition, the physical characteristics of the alloys studied in this paper were determined, such as alloy chemical dependence of extension and contraction ratio, impact toughness and hardness. The results obtained in this paper showed that the iron-based alloy with the content of carbon of 0.57 % (wt.), silicon of 0.28 % (wt.) and manganese of 0.86 % (wt.)) had the superior microstructure and physical properties. It was determined that after a number of crystallization and phase transformation the alloy phase structure includes two phases: a-iron and cement magnesium doping Fe2.7Mn0,3C.. For the first time using the method quasichemistry received an expression of the free energy of a γ-iron alloyed with silicon and magnesium, and determined the solubility limit of carbon, manganese and silicon. The maximum content in γ-iron can reach: carbon 6,8 % (at.), manganese – 67,5 % (at.), silicon – 2,3 % (at.).