Stainless steel foils are being evaluated for use in exhaust gas
environments. In order to examine the effect of water vapor in the exhaust gas on oxidation performance, foil specimens were exposed at 650°-700°C to air containing 4-15% water vapor. In general , stainless steel alloys such as type 310 and 20/25/Nb were only marginally affected by the presence of water . However, alloy type 347 stainless steel was more strongly attacked under these conditions . These results suggest that alloys with Cr contents above 20% are better suited to exhaust gas environments.