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Degradation Behaviour of HR-120 Alloy Exposed to CH4–CO–H2–H2O Mixed-Gas Environments at 950 °C

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Abstract

The HR-120 alloy is a candidate structural material for heat-exchanger reactors of steam methane reforming. Consequently, the behaviour at high-temperature of this alloy in oxidizing/carburizing atmosphere is of considerable interest for industrial applications. In this study, the behaviour of HR-120 alloy was evaluated in Ar, CH4, CO, H2, H2O oxidant/carburizing gas mixtures at 1,223 K, with or without pre-oxidation. In the former case, the as-grown scale layer consisted of inner Cr2O3 layer and an outer MnCr2O4 spinel layer. This scale structure, which is completely transformed into carbide layer in Ar–CH4 atmosphere, exhibits an excellent stability in CH4, CO, H2, H2O gas mixture. However, the oxidation of particles rich in Nb promoted cracking and spalling of protective scale layer, resulting in exposure of substrate metal.

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Authors and Affiliations

  1. Institut Jean Lamour UMR 7198 CNRS, Université de Lorraine - Parc de Saurupt, CS 50840, 54011, Nancy Cedex, France

    K. E. Tillous, J. Dulcy & T. Belmonte

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  1. K. E. Tillous
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  2. J. Dulcy
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  3. T. Belmonte
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Correspondence to K. E. Tillous.

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Tillous, K.E., Dulcy, J. & Belmonte, T. Degradation Behaviour of HR-120 Alloy Exposed to CH4–CO–H2–H2O Mixed-Gas Environments at 950 °C. Oxid Met 82, 163–179 (2014). https://doi.org/10.1007/s11085-014-9484-5

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  • DOI: https://doi.org/10.1007/s11085-014-9484-5

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