60-50 kg/m U75V热轧异型钢轨跟端热处理工艺研究  

Study on Heat Treatment Process at Heel End of 60-50 kg/m U75V Hot Rolled Compromise Rail

作　　者：张凤明[1] 梁正伟[1] 侯斌 薛虎东 文浩然 Zhang Feng-ming;Liang Zheng-wei;Hou Bin;Xue Hu-dong;Wen Hao-ran(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Baotou Steel China Railway Track Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]包钢中铁轨道有限责任公司,内蒙古包头014010

出　　处：《包钢科技》2023年第2期36-40,共5页Science & Technology of Baotou Steel

摘　　要：对60-50 kg/m U75V热轧异型钢轨跟端锻压区域,进行了不同终冷温度及冷却速度的热处理工艺试验研究,分析了异型钢轨成型段、过渡段及热影响区的拉伸性能、轨顶面硬度、横断面硬度、显微组织、脱碳层。结果表明,异型钢轨成型段和过渡段终冷温度控制在650℃左右,冷却速度控制在1.3~1.7℃/s之间,热影响区终冷温度控制在550℃以下,冷却速度不小于2℃/s,可有效的解决异型钢轨成型段及过渡段硬度偏高、热影响区硬度偏低、软化区宽度超标的问题。In this paper,the experimental study on heat treatment process of forging area at heel end of 60-50 kg/m U75V hot rolled compromise rail with different finish cooling temperatures and cooling rates is carried out as well as the tensile properties,hardness of top surface of the rail and cross section,microstructure and decarburized layer of forming section,transition section and heat affected zone of the compromise rail are analyzed.The results showed that the finish cooling temperatures of forming and transition sections of the compromise rail were controlled at about 650℃,cooling rate was controlled at 1.3~1.7℃/s,finish cooling temperature of heat affected zone was controlled below 550℃and cooling rate was not less than 2℃/s,with which the problems of high hardness at forming and transition sections,low hardness at heat affected zone and width out of limits at softened zone of the compromise rail could be effectively solved.

关 键 词：U75V钢轨 异型钢轨 热处理工艺 

分 类 号：U213.4[交通运输工程—道路与铁道工程] TG162.82[金属学及工艺—热处理]