Corrosión a temperatura alta del acero ferrítico 9Cr-1Mo modificado P91, en atmósferas simuladas oxidantes-carburantes

D. Y. Peña-Ballesteros; C. Vásquez-Quintero; D. Laverde-Cataño; A. Serna G

doi:10.3989/revmetalm.1139

Authors

D. Y. Peña-Ballesteros Grupo de Investigaciones en Corrosión (GIC), Universidad Industrial de Santander
C. Vásquez-Quintero Grupo de Investigaciones en Corrosión (GIC), Universidad Industrial de Santander
D. Laverde-Cataño Grupo de Investigaciones en Corrosión (GIC), Universidad Industrial de Santander
A. Serna G RWD

DOI:

https://doi.org/10.3989/revmetalm.1139

Keywords:

Oxidation, carburization simultaneous, 9Cr-1Mo modified steel, High temperature corrosion, Solid state diffusion

Abstract

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, CO₂, CH₄, H2O and H₂, 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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