ABSTRACT
Currently, changes to the requirements for the manufacture of railway rails cause the need for new chemical compositions and heat treatment. Boron and calcium microalloying is a rather promising direction in the development of railway rails in accordance with the DSTU EN 13674:2018 standard. In the work, steel with carbon at the level of 0.9% was produced with boron and calcium microalloying. A study of the influence of the cooling rate on the structural properties was carried out, and the recommended cooling parameters and the dependence of the cooling rate on the interlaminar distance of pearlite and bulk hardness were established. The following chemical composition is recommended for experimental and industrial testing of railway rail manufacturing technology: C = 0.90%, Si = 0.39%, Mn = 0.89%, Ca = 0.0006%; В=0.0003% and recommended heat treatment parameters: accelerated cooling of the rail head at a rate of 5.1±0.2°C/s with tempering at 200°C.
