客运专线用100m钢轨矫直断裂原因分析

来源期刊：钢铁2011年第1期

论文作者：任安超 吉玉 周桂峰 袁泽喜 韩斌 周剑华

文章页码：92 - 96

关键词：60kg/m重轨； 扣头； 矫直； 断裂

Key words：60kg/m heavy rail； warp； straightening； fracture

摘    要：客运专线用100m 60kg/m重轨在焊轨厂拼焊后,当四面矫直时发生断裂现象。采用光学显微镜及扫描电镜(SEM)等方法对钢轨矫直时断裂原因进行了分析和研究。结果表明:钢轨断裂是由于距钢轨端部约100mm轨底边缘处存在凸台缺陷,此凸台在钢轨拼焊后进行除瘤时除瘤刀将其铲平,致使钢轨产生冷裂纹,进而在矫直时断裂。通过控制万能精轧上下辊的辊径差以及调整轧制线高度等措施,使钢轨出轧机时尽量保持平直,避免上翘或扣头,从而消除凸台缺陷。

Abstract: Rails of passenger line,which were welded together in the rail welding plant,were fractured during straightening.Fracture causes are analyzed by optical microscope and SEM.The results show that boss defect existed at the end of the edge of rail is the main reason,and cold crack is caused when the boss is shoveled smooth by removal-tumor knife,rail is broken off at last.Rails are kept straight when rails are rolled in finishing by means of controlling roll diameter difference and rolling line height and so on.Upturned or warp is avoided,and thus boss defect are eliminated.