Method for producing hypereutectoid steel rail resistant to contact fatigue

A method for producing a hypereutectoid steel rail resistant to contact fatigue, characterized in that the method comprises performing molten iron desulphurization, converter smelting, LF refining, RH refining, continuous casting and billet heating, rolling and heat treatment after rolling to obtain a steel rail;

• the heat treatment after rolling comprises performing accelerated cooling and air cooling on the center of a tread of a rail head, both sides of the rail head and the center of a rail bottom of the steel rail obtained after rolling, wherein the starting cooling temperature of the accelerated cooling is 650-900° C., the cooling rate is 1.0-5.0° C./s, and the final cooling temperature is 400-550° C.;
• and after reaching the final cooling temperature, the accelerated cooling is stopped and the steel rail is air-cooled to room temperature;
• wherein the chemical composition of the steel rail comprises 0.9 mass %-1.2 mass % of C, based on the total mass of the steel rail;
• wherein the RH refining comprises vacuum degassing,
• wherein, 10-30 mass % of activated limestone, 5-25 mass % of calcium carbide and 300-1500 m of calcium wire are added, based on the total amount of slag, before the vacuum degassing treatment in the RH refining, and not added after vacuum degassing.