Nano-Pearlite Rail and Process for Manufacturing Same

A nano-pearlite rail, which is a steel rail having an internal microstructure of 100% pearlite with an average interlamellar spacing of pearlite of 55-70 nm, and containing 0.83 to 0.93 of C, 0.05 to 0.10 of Mn, a certain content of Al and Si, 1.0 to 1.5 of Cr, 0.1 to 0.3 of Co, 0.35 to 0.55 of Zr, 0.02 to 0.06 of Mg, 0.01 to 0.05 of Cu, less than 0.025 of S, less than 0.025 of P, and the balance Fe, wherein the content of Al is 8 to 12 times the content of Mn and the collective content of Al and Si is 1.5 (in wt. %). A process for manufacturing the nano-pearlite rail mainly comprises subjecting a molten steel to refining and continuous casting and roiling to form a rail, in combination with controlled cooling of the rail after rolling, and stress relieving and tempering treatment. The manufacturing process of the present invention is simple, and easy to be operated in a large scale. The rail thus obtained has a tensile strength of no less than 1300 MPa, a yield strength of no less than 1000 MPa, a hardness of HRC 44-47, and an elongation of no less than 10%, as well as excellent wear resistance and fatigue resistance, and is particularly suitable for applications in heavy-haul railways, especially for the railway segments having a sharp turn, and for a wing rail in bainite steel combined frog.