Method of making high strength steel crane rail

摘要

A method of making a high strength head-hardened crane rail and the crane rail produced by the method. The method comprises the steps of providing a steel rail having a composition comprising, in weight percent: C 0.79 - 1.00%; Mn 0.40 - 1.00; Si 0.30 - 1.00; Cr 0.20 - 1.00; V 0.05 - 0.35; Ti 0.01 - 0.035; N 0.002 to 0.0150; and the remainder being predominantly iron. The steel rail is cooled from a temperature between about 700 and 800 °C at a cooling rate having an upper cooling rate boundary plot defined by an upper line connecting xy-coordinates (0 s, 800 °C), (40 s, 700 °C), and (140 s, 600 °C) and a lower cooling rate boundary plot defined by a lower line connecting xy-coordinates (0 s, 700 °C), (40 s, 600 °C), and (140 s, 500 °C).