Analysis and Improvement for Cold Drawing Fracture of 40Cr Steel Bar
HE Jie;FU Chenghui;Huaigang Special Steel Co.,Ltd.,Jiangsu Shagang Group;
Cold drawing fracture of 40Cr samples were analyzed by using EDS,Optical Microscope,Spectrometer,Micro hardness tester,to test and analyze the reason of cold drawing fracture.By means of macroscopic analysis,chemical composition analysis,metallographic examination and fracture analysis,the reason of cold drawing fracture is further studied.The results show that the reason of cold drawing fracture of the 40Cr steel is due to the abnormal structure on the surface of the samples,which were from unreasonable rolling and cooling process.The cooling rate is too fast,which results in abnormal structure such as bainite.
【Key Words】：
40Cr steel bar material cold drawing fracture failure analysis
【Fund】： 江苏省科技成果转化专项资金项目“高速重载铁路用高性能特殊钢研发及产业化”(BA2013111)
【CateGory Index】： TG356.3
【Fund】： 江苏省科技成果转化专项资金项目“高速重载铁路用高性能特殊钢研发及产业化”(BA2013111)
【CateGory Index】： TG356.3
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