With the steady reduction in the SOFC operating temperatures to 600~800oC, the less-expensive ferritic stainless steels have become the favorable materials to replace the chromium based-perovskites and alloys to construct interconnects in SOFC stacks. This application requires that the ferritic compositions possess an excellent chemical stability, which are most often evaluated either in air or a fuel environment. In the present work, several ferriitc stainless steels with different level of chromium content have been evaluated under a simultaneous, dual exposure, with one side exposed to air and the other to a reforming gas. The composition, structure, and microstructure of the scale and bulk alloy in dual atmospheres will be presented in comparison with the results from the evaluation in either air or the reforming gas only.