steels for rails with excellent combination of properties such as wear and tear, fatigue resistance and weldability and rolling contact

摘要

the invention relates to a steel used in the manufacture of rails, in particular for grooved rails, with a hardness of at least 330 hv30, a tensile strength of at least 1000 mpa and a yield of at least 600 mpa and involving in% by weight: 0.70% to 0.85% of carbon. 0,65% to 1.00% silicon, and 1.1% to 1.4% of manganese, and 0.07% to 0.15% vanadium, down to 0.8% of nitrogen and phosphorus to 0.025% and 0.008% to 0.030% sulphur; more than 2.5 ppm of hydrogen; at most 0.10% of chromium and aluminium to 0.010%, not more than 20 ppm of oxygen, the rest being iron and unavoidable impurities.