Investigation of Cr34Ni45 Ethylene Cracking Furnace Tube in Service

Abstract:

The structure and mechanical property changes of Cr34Ni45 ethylene cracking furnace tube serviced for different time (as-cast, 1.5 years and 6 years) are systematically investigated by using SEM, EMPA, XRD and mechanics performance test methods. The microstructure of the as-cast alloy consists of austenitic matrix, NbC and M₇C₃ primary carbides. Eutectic M₇C₃ transform into M₂₃C₆, and the NbC transform into Nb₃Ni₂Si which is so-called η-phase during service, accompany with precipitation of secondary M₂₃C₆. Furthermore, comparing to original uniform microstructure distribution, there are three zones including oxidation layer, carbides depletion zone and carbides-rich zone at the subsurface region of the inner-wall of Cr35Ni45 tubes after long time service. Oxidation behaviors at high temperature consist of external oxidation of chromium and internal oxidation of silicon. The carburizing behavior of Cr35Ni45 tube is mainly caused by the coking on the surface of inner-wall, but carburization of the serviced tubes are both at lesser-degree because of the auto-remediation of outer oxidation layer. High temperature service heavily reduced mechanical performance of the tubes, and fracture mode transform from a mixed mode to a brittle one during service.

• Periodical: Advanced Materials Research (Volumes 834-836)
• Pages: 390-400
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.834-836.390
• Online since: October 2013
• Authors: Ruo Kang Song*, Mai Cang Zhang, Jian Xing Dong, Chen Yang Du
• Keywords: Carburization, High Temperature Service, Microstructure Evolution, Oxidation

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