Abstract
Carbon monoxide reformer furnaces were used in the petrochemical industry to produce kinds of gases such as CO, OXO and H2 from a mixture of natural gas and steam at high temperature. However, the degradation of material microstructure was frequently encountered in the outlet manifolds due to the service environment undertaking elevated temperature and complex stress state, leading to their premature failure. In this paper, some properties were compared between premature failure manifold and virgin pipe material, such as chemical compositions, mechanical properties at room temperature and elevated temperatures, etc. The deterioration trend of manifold material 20Cr33NiNb alloy was obtained. Microscopic fracture surfaces were observed. The microstructure of failure manifold was analyzed by SEM and EDS. The results indicated that elevated temperature and high stress level were considered to be the failure reasons. Some meaningful suggestions were proposed.
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