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.
instrument air coolerheat exchange tubecracking failurechlorine ionfatiguestress corrosion cracking
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