The corrosion behavior of austenitic stainless steels (UNS S30400/S30403 S30800) with machined electropolished or temper filmed surfaces was tested in deaerated pH adjusted water at 500F 550F and 620F for up to 10000 hours. Test specimens were subsequently analyzed by X-Ray Diffraction Auger Electron Spectroscopy and Electron Spectroscopy for Chemical Analysis to determine oxide composition thickness and structure. The resultant corrosion rate of the machined specimens exhibited an inverse temperature dependency with the rates decreasing by an order of magnitude from the lowest to the highest test temperature. Corrosion of electropolished specimens was only slightly sensitive to temperature effects and was similar to machined specimens at the highest temperature. Temper filmed materials had distinct phases of slow or rapid corrosion with different durations depending on the test temperature. Corrosion films on all specimens consisted of varying degrees of iron-rich spinel crystals covering a smooth layer of chromium-rich oxide most likely Fe3O4 and/or FeCr2O4 with some (CrFe)2O3. The temper films consisted of Cr2O3 which persisted throughout the test. The elemental composition of the films particularly the nickel content varied with increasing temperature.Key words: Corrosion austenitic stainless steel electropolish temper film oxide