RAIL HAVING HIGH WEAR RESISTANCE AND HIGH INTERNAL DAMAGE RESISTANCE, AND ITS PRODUCTION METHOD

摘要

A rail haiving a high wear resistance and a high internal damage resistance required for heavy load railways. The head of steel contains 0.85 (more than 0.85) to 1.20 wt.% of C, 0.10 to 1.00 wt.% of Si, 0.40 to 1.50 wt.% of Mn, 0.0005 to 0.0040 wt.% of B, and if necessary, at least one of 0.05 to 1.00 wt.% of Cr, 0.01 to 0.50 wt.% of Mo, 0.02 to 0.30 wt.% of V, 0.002 to 0.05 wt.% of Nb and 0.10 to 2.00 wt.% of Co. The head is acceleratedly cooled at a cooling rate of 5-15 DEG C/sec from the austenite temperature zone to 650-500 DEG C. The range of the rail from the surface of the head to the depth of a least 20 mm has a pearlite structure and has a hardness of at least Hv 370. The difference of the hardness within this range is not greater than Hv 30.