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Carburization of 9 %Cr Steels in a Simulated Oxyfuel Corrosion Environment

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Abstract

Laboratory corrosion tests, simulating fireside corrosion of 9 mass%Cr steels in an oxyfuel boiler of combusting bituminous 0.6 %S coal, were conducted. Thermodynamic calculation of the tube deposit chemistry indicated that sulfates, instead of carbonates, should be the stable corrosive salts. Specimens of 9 %Cr steels were coated with a synthetic salt mixture of 37.5 m/o Na2SO4–37.5 m/o K2SO4–25 m/o Fe2O3 and were exposed to 57.6 vol%CO2–22.4 %H2O–1.6 %O2–0.16 %SO2–18.2 %N2 at 500–700 °C for 96 h. A two-layered scale of outer “pure” iron oxides and inner oxide/sulfide mixture of Cr and Fe formed on the specimens. The two-layered scale became thick at temperatures where the deposits were fused. The tested steals also underwent internal carburization, with the carbide-zone thickness increasing with increasing temperature for the given exposure time. Growth rate of the carburization zone was much less than the estimation derived from diffusion constants of carbon in α-Fe.

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Acknowledgments

The author wishes to thank S. Ishibashi and Y. Tabata for their contribution in conducting the laboratory experiments.

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Authors and Affiliations

  1. Technical Research & Development Bureau, Nippon Steel & Sumitomo Metal Corporation, 1-8 Fusocho, Amagasaki, 660-0891, Hyogo, Japan

    Nobuo Otsuka

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  1. Nobuo Otsuka
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Correspondence to Nobuo Otsuka.

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Otsuka, N. Carburization of 9 %Cr Steels in a Simulated Oxyfuel Corrosion Environment. Oxid Met 80, 565–575 (2013). https://doi.org/10.1007/s11085-013-9396-9

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