PEARLITE RAIL AND METHOD FOR MANUFACTURING PEARLITE RAIL

摘要

A method of manufacturing a pearlitic rail according to the present invention includes: hot rolling a billet including in % by 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; 0.1% to 2.0% of Cr, remainder of the composition consisting of Fe and inevitable impurities, so as to achieve a finishing rolling temperature of not lower than 900°C to form a rail material; and cooling the rail material in an accelerated manner at a cooling rate of 2°C /s to 30°C /s from a temperature of 770°C to 500°C, reheating the resultant or subjecting the resultant to secondary heating to a temperature within the range of 530°C to 580°C, holding the resultant at the temperature range for 20 s to 100 s, and cooling the resultant in an accelerated manner at a cooling rate of 2°C /s to 10°C /s to a temperature within the range of not higher than 450°C.