Abstract
Abstract The material degradation of ethylene cracking furnace tubes after 7 years service was investigated in this study. The results showed that carburization and creep damage were occurred during service. Significant degradation of microstructures and decrease of mechanical properties were revealed for these tubes, based on the experiment including micro-structural observations, SEM observations, and tensile tests at room temperature and service temperature. Then, quantitative relationships between metallurgical characteristics and mechanical properties were established according to statistical measurements of carbide parameters, which provides an useful approach for estimation the mechanical properties of tube. Furthermore, a classification criteria for material deterioration and embrittlement evaluation of furnace tube was proposed based on average carbide width, which can be used for life assessment and failure prediction of ethylene cracking furnace tube.
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