A technological scheme for vacuum-thermal decarburization (VTD) of high-carbon ferrochrome (HC-FeCr) was developed based on preliminary research and existing production methods. Optimal conditions for grinding, oxidation, briquetting, and drying were determined through experimental studies. The kinetic parameters of the VTD reaction for HC-FeCr were identified using thermal analysis. Combined with thermodynamic calculations, these parameters enabled the proposal of optimal VTD conditions (temperature, pressure, and process duration).
The article examines the results of the work carried out by metallurgical companies in 2002–2024 on reconstruction of production to increase the competitiveness of manufactured products. An analysis of the work of pipe enterprises by pipe types in 2018–2023 is provided.
Using the technique applied in the analysis of vortex fields, shear displacements of metal along the trajectory of a logarithmic spiral during longitudinal rolling of blanks were investigated. Knowledge of the regularity of the development of the shear trajectory made it possible to establish the radii of the trajectories of shear displacements of metal when modeling the process of rolling blanks in rolls with a diameter of 1200, 1000, and 800 mm and to establish the frequency of development of shear displacements of metal for the rolls of the studied series. The results were obtained for the ratios of the thicknesses of the lamellas (strips) δ3/δ1 formed during shear, or the frequency of development of shear displacements of the metal in the form of the following ratios: δ3/δ1 = 3.2, δ3/δ2 = 1.7, δ2/δ1 = 1.8, the numbering order corresponds to the given size series of rolls. The specified values show the level of deformation effect on the metal of the technological tool depending on its dimensions.
Comprehensive studies of five varieties of hot-rolled microalloyed steels with different chemical compositions were conducted. The influence of structural characteristics of steel on its corrosion resistance was assessed. It was shown that the greatest contribution to the increase in corrosion resistance of steel is made by the chromium content; its increase to 0.5–0.6 wt.
The structure and properties of sheet steel produced from low carbon martensitic steel using various controlled rolling regimes was investigated. Standard mechanical properties, ductility parameters, and steel toughness were determined. The effects of the temperature range and the final deformation temperature during the finishing stage of rolling on the structure and consequently on the strength properties, cold resistance, and fracture resistance of the rolled steel were investigated. The study reveals the relationship between the processing regime and the level of steel properties. The results indicate that reducing the final deformation temperature improves low-temperature impact toughness and increases the proportion of crack propagation work in the total fracture energy.
