10.26731/1813-9108.2017.4(56).197-206
Technical reconstruction of railway transport, the efficient use of new powerful locomotives, and accelerating the movement of trains to a large extent depend on the quality of rails. Modern rails operate under hardship conditions. The static load on the axle or heavy locomotive car reaches 27 m. The rail quality is crucial not only for ensuring the rates of freight train traffic on certain high traffic density, high speed and traffic safety, but also for the extension of their service life on the road.
During the cooperative work, the experts of Evraz ZSMK (United West Siberian Metallurgical Combine) and Irkutsk State Transport University conducted a testing of the composition of steel, wear-resistant rails manufacturing technology for the RF Ministry of Railways Railway road and industrial tests in arduous sections of the track. To improve the quality of the rails, it is necessary to improve the wear resistance, the chemical composition and purity of the rail metal. It is also necessary to improve the heating technology for billets and the rolling, as well as the calibrating of rolls, heat treatment, etc. For R65 rails in curved sections of the track, especially with curves of a small radius (R <450 m), the guaranteed number of the transported cargo is not more than 150 million tons. The nature of the defects results in the deflection of rails from the track at different straight and curved portions of small radius. The main defects in the areas of small radius curves are crushing and abrasion of rails. This problem is solved by the production of hypereutectoid steel rails and bainitic steel rails.
This article provides an analysis of the workout of the composition and the production technology parameters for rails made of the hypereutectoid steel, and also the results of tests on the experimental batches of rails.
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