Nickel-base superalloy 617 OCC has been indigenously developed for potential use in Advanced Ultra-Super Critical (USC) Power Plants. Hot corrosion is one of the serious issues associated with superheater and reheater tubes in the boiler part of the USC power plant. To understand the high temperature corrosion processes coming into play, it is useful to have a good understanding of the oxidation behavior of the alloy at the same temperature in ambient air environment. The present study reports, how the Alloy 617 OCC behaves in laboratory air environment at 700 °C. Studies were carried out at intervals of 500 h for a cumulative exposure time of 5000 h. Thermogravimetry, XRD of the corroded surface, SEM/EDAX analysis of corroded surface and cross-sectional surface were carried out after each of the 10 exposure times. Thermogravimetry revealed that there was essentially no weight change of the test specimen over the entire exposure time range. XRD revealed that chromium oxide is essentially the only corrosion product. SEM/EDAX and XRD of the corroded surface showed the progressive increase in the extent of chromium oxide formation on the surface. A well-developed chromium-depleted region was seen below the chromium oxide layer in the X-ray mapping studies. The present research showed that considerable levels of nickel and cobalt occur above the chromium oxide layer at the surface. There is evidence that metallic agglomerates form above the chromium oxide layer. Titanium present in the superalloy gets preferentially oxidized and gets into the chromium oxide layer at the surface. Preferential surface oxidation of aluminum was also noticed. There was evidence for internal oxidation of aluminium at long exposure times. The above findings will be presented and discussed, bringing out the oxidation mechanisms coming into play for 617 OCC at 700 °C. © 2019 Elsevier Ltd.