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.
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