Simulated　fireside　corrosion　behavior　of　a　new　type　Ni-Cr-Fe-W-based　superalloy　was　investigated　at　700　°C.　The　weighing　method,　SEM　(Scanning　Electron　Microscope),　EDS　(Energy　Dispersive　Spectrometer)　and　XRD　(X-Ray　Diffraction)　analyses　were　employed　to　understand　the　corrosion　kinetics,　morphologies,　compositions　and　phases　of　the　corrosion　products,　respectively.　The　results　indicated　that　the　mass　gain　of　the　Ni-Cr-Fe-W　superalloy　was　an　approximately　stable　up　to　500　h.　A　dense　and　integrity　oxide　scale　with　complex　microstructure　formed　on　the　top　surface　of　Ni-Cr-Fe-W　superalloy　identified　as　(Fe,Cr)xOy,　Cr2O3　and　Al2O3.　Underneath　the　scale　was　a　chromium　depleted　zone　with　numerous　molybdenum　and　chromium　sulfide　distributed　in　the　grain　boundary.　The　corrosion　mechanism　of　Ni-Cr-Fe-W　superalloy　was　also　discussed　based　on　the　experimental　results.　©　ICOPE　2019　-　7th　International　Conference　on　Power　Engineering,　Proceedings.　All　rights　reserved.