MANUFACTURING METHOD OF RAILS FOR HEAVY-HAUL RAILWAYS

摘要

#$%^&*AU2019232893A120200514.pdf#####9 Abstract The invention relates to the field of rail preparation method, in particular to a manufacturing method of rails for heavy-haul railways, which can reduce the austenite grain size, refine the interlaminar spacing of pearlite, improve the rail strength and continuously improve the toughness of rails. It comprises the steps of: allowing a rail to be subjected to the primary heat treatment by using waste heat of rolling, heating the rail to 650 °C - 700 °C by a heating device, returning the rail to a heat treatment unit for secondary heat treatment, and quickly withdrawing the rail from the heat treatment unit. In this invention, since the interlaminar spacing has been refined through the primary heat treatment, the interlaminar spacing of pearlite can be further refined after the secondary heat treatment to improve the strength and toughness of rails. The rails produced by the method can reach the tensile strength of more than 1380MPa, and the fracture toughness of not less than 38MPa-mi/2 at -20 °C, thus providing the excellent wear resistance and contact fatigue resistance. The invention is especially suitable for the production of rails for heavy-haul railways.