首页|Sulfidation failure of UMCo-50 protective sheath tube used for a temperature monitoring device exposed to sulfur dioxide bearing hot gas
Sulfidation failure of UMCo-50 protective sheath tube used for a temperature monitoring device exposed to sulfur dioxide bearing hot gas
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NSTL
Elsevier
? 2022 Elsevier LtdThe failure investigation of a thermocouple protective sheath tube made of UMCo-50 cobalt base alloy exposed to SO2-bearing hot gas in a sulfur refining furnace was systematically conducted. Various microstructural examination techniques were employed in order to clarify a root cause of failure. A tip portion of protective sheath tube remarkably revealed its severe material degradation after exposure to SO2-bearing hot gas in service for approximately 6 months. From the investigation, it turned out that the alloy was significantly prone to sulfidation attacks due to the formation of undesired chromium-rich carbides in its structure, which was accelerated by temperature fluctuation between 550 and 1100 °C during service. As a result, the protective sheath tube could not last for approximately 3 years as its design life.
Chromium-rich carbidesSO2-bearing hot gasSulfidation attacksUMCo-50 cobalt base alloy
Ouampan S.、Kaewkumsai S.、Viyanit E.
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National Science and Technology Development Agency (NSTDA)
NSTL
Elsevier
