Actual temperatures of structural and phase transformations Ar 3 and Ar 1 for different chemical compositions of low-alloy pipe steels are determined on the basis of dilatometric studies. Equations are obtained for calculating the temperature of critical points Ar 3 and Ar 1 taking account of the effect of 14 main chemical elements as a result of processing experimental data. It is shown that Ar 3 and Ar 1 temperatures calculated by well-known equations differ (by 10–80°C) considerably from actual temperatures, whereas the relationships proposed increase the precision of critical temperature calculation for low-alloy steels by 10°C at least.
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Rolled product of strength class K56 for seismic-resistant use, intended for pipe manufacture, designed for operation in areas with seismicity more than eight points on the Richter scale (produced for the first time in Russian in the MMK 5000 mill).
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This work was carried out with financial support of the Russian Ministry of Education and Science within the scope of implementing a state assignment (Grant No. 1274).
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Translated from Metallurg, No. 9, pp. 32–37, September, 2015.
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Salganik, V.M., Chikishev, D.N., Pozhidaeva, E.B. et al. Analysis of Structural and Phase Transformations in Low-Alloy Steels Based on Dilatometric Studies. Metallurgist 59, 766–773 (2016). https://doi.org/10.1007/s11015-016-0172-3
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DOI: https://doi.org/10.1007/s11015-016-0172-3