Degradation of C-1/2Mo Steel Pipe by Metal Dusting in a Steam Reforming Process
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A C-1/2Mo steel pipe of a heat recovery economizer in a steam reforming process used in the production of high-purity hydrogen has developed large pits at the inner surface. Light optical microscopy, x-ray diffraction, scanning electron microscopy combined with energy dispersive x-ray spectroscopy and transmission electron microscopy have been used to characterize the microstructure of the pitted pipe. Degradation of the pipe has been correlated with higher than normal temperature enhancing metal dusting as well as a material not intended to function in such an environment. Microstructural characterization shows that the sequence of events leading to the observed pitting follow a model proposed to explain metal dusting of carbon and low-alloy steels.
KeywordsC-1/2Mo steel Metal dusting Electron microscopy
The author acknowledges the continued support received from King Fahd University of Petroleum and Minerals.
- 1.V.V. Venkateasan, N. Iordanova, in Proceedings of Twenty-Fifth Industrial Energy Technology Conference, Texas A&M University Press, Houston, 2003, pp. 165–178Google Scholar
- 2.Carbon Steel Handbook (Electric Power Research Institute, Publication No. 1014670), Palo Alto, 2007Google Scholar
- 3.G.R. Prescott, B. Shannon, in Proceedings of 45th Annual Safety in Ammonia Plants and related Facilities Symposium, American Institute of Chemical Engineers, New York, 2000, Paper No. 4FGoogle Scholar
- 4.D.J. Young, Shreir’s Corrosion, vol. 1 (Elsevier, Amsterdam, 2010), pp. 273–303Google Scholar
- 5.G.Y. Lai, High Temperature Corrosion and Materials Applications (ASM International, Materials Park, 2007)Google Scholar