PURPOSE: To manufacture a rail excellent in wear resistance, fatigue damage resistance, and weldability by cooling a rail under specific conditions at the time of cooling a hot rolled rail from a temp. in the austenite region.
CONSTITUTION: A steel having a composition containing, by weight, 0.55W0.85% C, 0.20W1.20% Si, 0.50W1.50% Mn, 0.20W0.50% Cr, and 0.0003W0.0030% B or further containing one or ≥2 kinds among 0.01W0.05% Nb, 0.05W0.20% V, and 0.01W0.05% Ti is hot rolled so as to be worked into a rail. At the time of cooling this high-temp. rail after hot rolling from a temp. in the austenite region, accelerated cooling is carried out through a temp. region from 800 to 450°C at 1W4°C/sec cooling rate. By this method, the rail exclusively for use in passenger trains used under relatively light load conditions and excellent in wear resistance and fatigue resistance a well as in weldability can be manufactured.
SUGINO KAZUO
FUKUDA KEIJI
MAKINO YOSHIAKI
