The influence of 0.2 and 0.4 wt.% Ti additions in 17%Cr ferritic stainless steels was investigated between 850 and 1 050degreesC in terms of isothermal and cyclic oxidation resistance in oxygen or air. In isothermal tests, titanium was shown to increase the parabolic rate constant of chromia scale formation. Activation energies measured on k(p) were similar for 17Cr steel without Ti and 17Cr steel with 0.2%Ti. In the case of 0.4%Ti, a marked reduction of the activation energy was noted, probably due to a doping saturation effect. During cyclic oxidation tests, parabolic-type behavior was maintained at 850 and 950degreesC, but mass loss was observed at 1 050degreesC. Scale adhesion energy estimations using room temperature forced spallation by tensile loading in the SEM chamber revealed very high adhesion on the 0.4%Ti steel but much lower on the 0.2% and Ti-free steels. These results agreed with observed spallation after 150 oxidation cycles where spallation was shown to be markedly reduced at all temperatures for the highest Ti level. The size and repartition of the TiO2 internal precipitates could explain the adhesion results.