Carburization of austenitic and ferritic alloys in hydrocarbon environments at high temperature

Authors

  • A. Serna Ecopetrol - Instituto Colombiano del Petróleo
  • R. A. Rapp Ohio State University. Department of Materials Science and Engineering

DOI:

https://doi.org/10.3989/revmetalm.2003.v39.iExtra.1114

Keywords:

Carburization, High temperature corrosion, Diffusion, Chromium molybdenum steels, Iron-chromium-nickel alloys

Abstract


The technical and industrial aspects of high temperature corrosion of materials exposed to a variety of aggressive environments have significant importance. These environments include combustion product gases and hydrocarbon gases with low oxygen potentials and high carbon potentials. In the refinery and petrochemical industries, austenitic and ferritic alloys are usually used for tubes in fired furnaces. The temperature range for exposure of austenitic alloys is 800-1100 °C, and for ferritic alloys 500-700 °C, with carbon activities ac > 1 in many cases. In both applications, the carburization process involves carbon (coke) deposition on the inner diameter, carbon absorption at the metal surface, diffusion of carbon inside the alloy, and precipitation and transformation of carbides to a depth increasing with service. The overall kinetics of the internal carburization are approximately parabolic, controlled by carbon diffusion and carbide precipitation. Ferritic alloys exhibit gross but uniform carburization while non-uniform intragranular and grain-boundary carburization is observed in austenitic alloys.

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Published

2003-12-17

How to Cite

Serna, A., & Rapp, R. A. (2003). Carburization of austenitic and ferritic alloys in hydrocarbon environments at high temperature. Revista De Metalurgia, 39(Extra), 162–166. https://doi.org/10.3989/revmetalm.2003.v39.iExtra.1114

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Section

Articles