PEARLITIC RAIL AND METHOD FOR MANUFACTURING PEARLITIC RAIL

摘要

The current amendments further and better define the invention as contemplatedby the applicant.In particular, the S value has been properly stated to be 0.0005% to 0.030% ofS, in keeping with thespecification and claims.A method of manufacturing a pearlitic rail accordingto the present invention includes: hot rolling a billetincluding 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; 0.0005%to 0.030% of S; 0.1% to 2.0% of Cr, remainder of thecomposition consisting of Fe and inevitable impurities, soas to achieve a finishing rolling temperature of not lowerthan 900°C to form a rail material; and cooling the railmaterial 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 tosecondary heating to a temperature within the range of530°C to 580°C, holding the resultant at the temperaturerange for 20 s to 100 s, and cooling the resultant in anaccelerated manner at a cooling rate of 2°C /s to 10°C /sto a temperature within the range of not higher than 450°C.