High temperature corrosion in processing units of the chemical, petrochemical, and thermoelectric carbochemical is of high interest, due to the costs generated by sudden failures caused by deterioration in the mechanical properties of metals, being the carburization of the metallic matrix the most important corrosion mechanism resulting in loss of ductility and creep resistance. In this research a 9Cr-1Mo modified steel P91 was exposed to simulated atmospheres oxidant-fuel gas mixtures simultaneous in equilibrium of CO, CO 2 , CH 4 , H 2 O and H 2 , similar to those produced in the refining industry, at temperatures between 550 and 750 oC. The microstructural evolution of the metal matrix was analyzed, also the growth, evolution and behavior of oxide layers and carburized, establishing the mechanism of deterioration of the material and the extent of damage for times exceeding 700 h of exposure.
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