Siberian State Industrial University (Novokuznetsk, Russia):

A. A. Umansky, Cand. Eng., Associate Prof., Director of the Center of collective usage “Material Science”, E-mail: umanskii@bk.ru
M. V. Temlyantsev, Dr. Eng., Prof., Vice-Rector on Science and Innovations

JSC “EVRAZ ZSMK” (Novokuznetsk, Russia):

A. V. Golovatenko, Cand. Eng., Director of Rail Production, E-mail: Aleksey.Golovatenko@evraz.com
V. V. Dorofeev, Dr. Eng., Chief Roll Pass Designer, E-mail: Vladimir.Dorofeev@evraz.com

Experimental studies of the plastic and deformation properties of chromium rail steels in the temperature range of hot rolling 900–1200 °C have been carried out. The regularities of the eff ect of the hot deformation temperature on plasticity, the eff ect of temperature and strain rate on the deformation resistance have been established and scientifi cally substantiated. It was found that for steel grades E76KhF and E90KhAF the maximum plasticity temperature is 1100 °C, while for steel E76KhF at the deformation temperature of about 1050 °C, a sharp decrease in plastic properties is observed, due to presence of cementite-type carbides at the grain boundaries. It is shown that an increase in the deformation temperature ensures a decrease in the plastic deformation resistance by an exponential law, while an increase in the strain rate from 1 to 10 s^–1 leads to a significant increase in the deformation resistance. Using the obtained experimental data, a new rail rolling mode was developed for the conditions of the JSC “EVRAZ ZSMK” rail-beam shop, a distinctive feature of which was the redistribution of reductions along the passes in such a way that the greatest reductions carried out in the split caliber were realized at a maximum ductility temperature of 1100 °C. Introduction of an improved rolling mode has signifi cantly improved the quality of rails and technical and economic indicators of their production with an economic effect of about 120 million rubles per year.
The work was performed using the equipment of the TsKP “Material Science” of the SibSIU within the framework of the basic part of the State task of the Ministry of Education and Science of the Russian Federation No. 11.6365.2017 / 8.9.

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