Temperature and Solid-state Phase Transition Characteristics of U75V Steel Rail During Air Cooling Process
Online heat treatment is the main method for strengthening and toughening the 100-meter U75V steel rail.Due to the different air cooling times before entering the heat treatment unit,the quenching tem-perature at different longitudinal(length direction)positions of the steel rail is different during the heat treatment.Quenching temperature is an important factor affecting the uniformity of longitudinal performance of 100-meter steel rail.The temperature and solid-state phase transition characteristics during the air cool-ing of U75V steel rail after rolling were studied.According to the current production process,the time inter-val between rolling and heat treatment of steel rail should be less than 238 s.Appropriate heating of the rear end of the steel rail before heat treatment,or shortening the time interval between rolling and heat treatment,was used to reduce the longitudinal quenching temperature difference of the steel rail,which was beneficial for improving the longitudinal performance uniformity of the 100-meter steel rail.
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维普
