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Information × Registration Number 0223U000493, 0121U111812 , R & D reports Title Development of chemical composition and technological parameters of heat treatment of high-strength rails with a hardness of more than 400 HB popup.stage_title Head Merkulov Oleksii Ye., Доктор технічних наук Registration Date 09-01-2023 Organization Institute of Ferrous Metallurgy. ZI Nekrasov of the National Academy of Sciences of Ukraine popup.description2  An analysis of world experience in the use of bainite and pearlitic steels was carried out, as well as the determination of promising compositions of steels for railway rails. A predictive model was developed on the basis of known TKD to determine the temperatures of the beginning of the bainite transformation and the cooling rate to obtain bainite with the achievement of hardness according to the NTD requirements for high-strength rails. Production of experimental steel ingots up to 10 kg with various alloying systems in laboratory conditions. The influence of small fluctuations in the content of chemical elements was established and the regularities of the formation of the phase composition under different cooling conditions (environment, section) were calculated. As a result of this simulation, the influence of chemical composition was determined in the ranges of carbon content 0.28...0.58%, manganese 0.81...1.41%, silicon 0.89...1.57%, molybdenum 0.1...0.5 %, nickel 0.1...0.17% per structural state for different cooling rates. According to the results of laboratory studies, the following chemical composition, % by mass, is recommended for experimental and industrial testing of the production of railway rails: C=0.37-0.39; Si=1.11-1.5; Mn = 1.35-1.60; Cr = 0.8-1.2; Mo 0.19-0.22; Ni ≤ 0.04; V=0.15-0.24%, which makes it possible to achieve a set of mechanical properties that exceeds the requirements for steel, which is stipulated by DSTU 4344:2004 and EN 13674:1-2011. Product Description popup.authors Merkulov Oleksii Ye. Podolskyi Rostyslav Safronova Olena A popup.nrat_date 2023-01-09 Close