Heat treatment method for bainitic turnout rail

摘要

The present disclosure discloses a heat treatment method for a bainitic turnout rail, which includes: naturally cooling the turnout rail at a temperature in an austenite 5 region after being finishing rolled to 450-480'C at a tread center of a rail head of the turnout rail; accelerated cooling the naturally cooled turnout rail to 230-270'C at the tread center of the rail head, a cooling rate at the tread center and a non-working side of the rail head being 1.5-5.0 0 C/s, a cooling rate at the working side of the rail head increasing by 0.1-1.0 0C/s based on 1.5-5.0 0 C/s; continuously accelerated cooling the 10 working side, the tread center and the non-working side of the rail head at a cooling rate of 0.05-0.25 0C/s to decrease a temperature of the tread center of the rail head to 265-270'C; and finally, naturally cooling the turnout rail to an ambient temperature.