The Study on Degradation of Stainless Steel Clad Plate Used for a Shift Reactor in Coal Chemical Plant
Shift reactors are widely used in the petroleum and chemical industries,and especially in the coal chemical plants.The degradation of the reactor is critical to the safe operation of coal chemical plant.In this paper,a shift reactor after 8 year service was chosen.The test block taken from the reactor cylinder with the stainless steel clad plate was used and the test samples from the test block were prepared.And then,chemical composition analysis,metallographic examination,tensile and hardness tests were performed.The scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) method were used to study the degradation and degradation mechanism of the reactor.The metallographic analysis results show that there were a large number of carbides segregated in the grain boundary and the intergranular cracks were observed for the samples in the weld zone of the stainless steel clad plate.The SEM and EDS results indicate that the corrosion medium (i.e.polythionic acid) was found in the fracture surface of the samples from the weld zone of the stainless steel clad plate.The XRD test results show that the tensile residual stress occurred for the welding of the stainless steel clad plates.It is found that the degradation mechanism of the shift reactor was due to the polythionic acid stress corrosion cracking.
shift reactor stainless steel clad plate degradation mechanism stress corrosion cracking
Qing Pan Jinzhu Tan Qiuyue Feng Yun Li Ridong He
School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing,Jiangsu 211816,China
国际会议
2016 International Symposium on Structural Integrity，ISSI—2016(2016国际结构完整性研讨会)
天津
英文
311-316
2016-05-26（万方平台首次上网日期，不代表论文的发表时间）