Failure Analysis of the Longitudinal Cracking in the Medium Carbon–Manganese Tube Billet Used in the Petroleum Industry
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In this case study, longitudinal cracking of the 37Mn5 continuous casting tube billets was investigated. The coarse columnar grains, ferrite nets, and ferritic WidmanStätten structures were observed by optically metallurgical microscope (OMM). The main crack was covered by a layer of oxidation products in dark black color, and the oxidation products were mainly composed of FeO and Fe3O4. The intergranular features were observed by OMM and field emission scanning electron microscope. By analyzing the experimental results, the failure cause of 37Mn5 tube billets was attributed to rapid cooling in the cooling bed after ejection. Higher superheat and higher withdrawal speed promoted the cracking of the continuous casting billets.
KeywordsLongitudinal cracking Intergranular cracking Rapid cooling Tube billets Failure analysis
This work was financially supported by National Natural Science Foundation of China (Grant No. 51101094), Science and Technology Project of Hebei Province (Grant No. 13211035) and Science and Technology Research Key Project of Colleges and Universities in Hebei Province (Grant No. ZD2015045).
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