Process for manufacturing high strength railroad rails

摘要

Steel rails having reduced camber and improved wear resistance provided by enhanced rail head strength and hardness level decreasing uniformly from the rail head surface to a depth of 15 to 25 mm. are produced by a method and apparatus in which the rail is preheated below the Ac3 temperature, heated above the Ac3, cooled in air, cooled three dimensionally with compressed air directed on the top and at an angle of 1-10 degrees onto the sides of the rail head, and further cooled with liquid coolant.