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This paper reports effect of heat treatment process on hardness and hot corrosion resistance of Fe-25Ni-18Cr-1Mo-2W-1Nb-cast austenite stainless steel. The steels sample were prepared by a process sequence of induction melting, hot rolled, solution treatment and aging. After heat treatment process, the steel is subject to light optical microscope, hardness microvickers test and hot corrosion of melting salt test. Scanning Electron Microscope (SEM), Energy Dispersive Spectrometry (EDS) and mapping of element was carried out to analysis of corrosion layer on its surface. Results show that higher hardness value was found in solution treatment of 975°C and aging for 16 h whereas higher hot corrosion resistance was found in solution treatment of 1025°C and aging 16 h.