Patent ID: 9394581
Filing Date: 2016-07-19
CPC Classification: C21D

Claim Text:
1. A heat treatment method for a bainitic turnout rail, comprising steps of: a. naturally cooling the turnout rail at a temperature in an austenite region after being finishing rolled to 450-480° C. at a tread center of a rail head of the turnout rail; b. accelerated cooling the naturally cooled turnout rail to 230-270° C. at the tread center of the rail head, wherein a cooling rate at a working side of the rail head is greater than a cooling rate at the tread center of the rail head and a non-working side of the rail head; c. continuously accelerated cooling the working side, the tread center and the non-working side of the rail head at a cooling rate of 0.05-0.25° C./s to decrease a temperature of the tread center of the rail head to 265-270° C.; and d. finally, naturally cooling the turnout rail to an ambient temperature.