Cracks occurred on heat exchange tube of instrument air cooler in a refining enterprise.The causes were studied through technical means such as macroscopic morphology observation,microscopic morphology observation,energy spectrum analysis and metallographic structure analysis,relevant solutions were presented.The analysis results suggested that the material of heat exchange tube is made of S31608 austenitic stainless steel.The main reason for cracking of heat exchange tube is chloride stress corrosion cracking,and followed by corrosion fatigue cracking aroused by large temperature difference stress.Thus,it is necessary to ensure the smooth process operation,optimize the design of heat exchanger structure and select ultra-low carbon stainless steel as the material of heat exchange tube.
关键词
仪表风冷却器/换热管/开裂失效/氯离子/疲劳/应力腐蚀开裂
Key words
instrument air cooler/heat exchange tube/cracking failure/chlorine ion/fatigue/stress corrosion cracking
维普
万方数据