Abstract
Different samples of INCOLOY 800H were exposed up to 950 °C and 10 000 h to a gas atmosphere simulating exposure to steam reforming methane process gas. The results indicated the predominant role of titanium in the formation of the main reaction products. The influence of titanium could be described by the following modifications of the primary oxide phases: (1) changing the lattice parameters of Cr2O3 by small amounts of Ti, (2) formation of solid solution of the spinels MnCr2O4 and Mn2TiO4, and (3) existence of an additional Ti containing phase of ilmenite type. Furthermore, it was observed that (1) manganese was practically insoluble in the Cr2O3 and (2) after long annealing time manganese was lost.
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