Dependence of the contraction ratio of rail metal on technological parameters of manufacture and the chemical combination, established fixed by statistical methods

Recommendations were made for optimisation of heat treatment of rails and chemical combination of rail steel directed on decrease of the rejection because of low contraction ratio. The objective is reached by raising of self-tempering temperature, decrease of hardening temperature, increase in velocity of the rail movement, decrease of content of O2 and P, increase in content of Cr, keeping Mn and V content at the bottom level