| 摘要 |
In this method for manufacturing a pearlite rail, a billet is hot-rolled so that the rolling finishing temperature reaches 900°C or higher, the billet containing, in terms of percentage of mass, 0.70% to 0.90% of C, 0.1% to 1.5% of Si, 0.01% to 1.5% of Mn, 0.001% to 0.035% of P, 0.005% to 0.030 of S, and 0.1% to 2.0% of Cr, the remainder being Fe and inevitable impurities. A rail material is molded, and accelerated cooling of the rail material is started from a temperature of 770°C or higher. The rail material is cooled to a temperature of 500°C or lower at a cooling rate of 2 to 30°C/s, and then is recuperated or reheated to a temperature range of 530 to 580°C. The rail material is held in the temperature range for a time of 20 to 100 s, and the accelerated cooling is carried out to a temperature range of 450°C or lower at a cooling rate of 2 to 10°C/s. |
