Steel rail and method of manufacturing the same

1. A steel rail comprising:

by mass %,

higher than 0.85% to 1.20% of C;

0.05% to 2.00% of Si;

0.05% to 0.50% of Mn;

0.05% to 0.60% of Cr;

P≦0.0150%; and

the balance consisting of Fe and inevitable impurities,

wherein 97% or more of a head surface portion which is in a range from a surface of a head corner portion and a head top portion as a starting point to a depth of 10 mm has a pearlite structure,

a Vickers hardness of the pearlite structure is Hv320 to 500, and

a CMn/FMn value which is a value obtained by dividing CMn [at. %] that is a Mn concentration of a cementite phase in the pearlite structure by FMn [at. %] that is a Mn concentration of a ferrite phase is equal to or higher than 1.0 and equal to or less than 5.0.

2. The steel rail according to claim 1 , further comprising one kind or two or more kinds selected from the group:

by mass %,

0.01% to 0.50% of Mo;

0.005% to 0.50% of V;

0.001% to 0.050% of Nb;

0.01% to 1.00% of Co;

0.0001% to 0.0050% of B;

0.01% to 1.00% of Cu;

0.01% to 1.00% of Ni;

0.0050% to 0.0500% of Ti;

0.0005% to 0.0200% of Mg;

0.0005% to 0.0200% of Ca;

0.0001% to 0.2000% of Zr;

0.0040% to 1.00% of Al; and

0.0050% to 0.0200% of N.

3. A method of manufacturing the steel rail according to claim 1 or 2 , comprising:

performing first accelerated cooling on a head portion of the steel rail at a temperature of equal to or higher than an Ar1 point immediately after hot rolling, or a head portion of the steel rail reheated to a temperature of equal to or higher than the Ac1 point+30° C. for purposes of a heat treatment, at a cooling rate of 4 to 15° C./sec from a temperature range of equal to or higher than 750° C.;

stopping the first accelerated cooling at a time point when a temperature of the head portion of the steel rail reaches 600° C. to 450° C.;

controlling a maximum temperature increase amount including transformation heat and recuperative heat to be equal to or less than 50° C. from an accelerated cooling stop temperature;

thereafter performing second accelerated cooling at a cooling rate of 0.5 to 2.0° C./sec; and

stopping the second accelerated cooling at a time point when the temperature of the head portion of the steel rail reaches 400° C. or less.