Heat resistant Ni-Cr-Fe austenitic alloys for pyrolysis furnaces: A review

Matías H.  Sosa Lissarrague; César A.  Lanz

doi:10.3989/revmetalm.e274.1678

Authors

Matías H. Sosa Lissarrague Laboratorio de Metalurgia y Tecnología Mecánica, Departamento de Ingeniería, Universidad Nacional del Sur https://orcid.org/0000-0003-4188-1046
César A. Lanz Laboratorio de Metalurgia y Tecnología Mecánica, Departamento de Ingeniería, Universidad Nacional del Sur https://orcid.org/0000-0002-4327-9553

DOI:

https://doi.org/10.3989/revmetalm.e274.1678

Keywords:

Aging, Creep, Failures, G-phase, Heat resistant alloys

Abstract

Progress in the manufacture of refractory alloys, as well as the development of alloys with improved performance, are essential for the manufacture of pyrolysis furnaces in the chemical industry. This review aims to provide an overview of the improvement procedures for the alloys used for the manufacture of reformer furnace tubes. In this review, the physical metallurgy of the alloys currently used is presented, highlighting the importance of the presence of the carbides NbC, Cr₇C₃ and Cr₂₃C₆ that are commonly observed in the dendritic microstructure of these Ni-Cr-Fe-based refractory alloys, as well as the role played by the alloying elements used to control the mechanical properties during service at high temperatures for extended periods of time. In addition, the effects of the most common failure mechanisms that occur during service of these materials are analysed, and failure cases are presented where the weldability of these alloys is analysed, which is necessary to ensure proper repair and durability of the alloy under normal service conditions.

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