Duplex　stainless　steel　(DSS)　has　been　used　widely　due　to　its　very　excellent　combination　of　mechanical　and　corrosion　resistance　properties.　However,　the　use　of　DSS　is　limited　by　their　susceptibility　to　the　formation　of　dangerous　intermetallic　phases,　such　as　σ　phase　and　χ　phase,　resulting　in　the　detrimental　effects　on　mechanical　properties　and　corrosion　resistance.　With　the　application　of　the　super　duplex　stainless　steel　(SDSS)　with　a　pitting　resistance　equivalent　number　more　than　40.　The　harmful　effects　of　intermetallic　phases　easily　precipitated　in　DSS　on　mechanical　properties　and　corrosion　resistance　are　a　research　focus.　This　paper,　based　on　prior　study,　investigates　the　effects　of　intermetallic　phases　formed　during　aging　on　the　mechanical　properties　and　corrosion　resistance　of　cast　2507　super　duple　stainless　steel　by　means　of　optical　microscope　(OM),　scanning　electron　microscope　(SEM),　tensile　test　and　electrochemical　test.　The　results　indicate　that　for　the　solution　annealing　cast　2507　super　duplex　stainless　steel　aged　in　the　temperature　range　650-950°C,　small　and　depressive　distribution　χ　phase　precipitated　from　ferrite　can　increase　its　tensile　strength,　but　σ　phase　causes　the　opposing　effect　on　its　plasticity　owing　to　precipitated　along　grain　boundaries.　Both　of　them　can　rapidly　deteriorate　its　plasticity,　and　cause　brittle　failure.　The　effect　of　σ　phase　on　corrosion　resistance　of　2507　SDSS　is　weaker　than　χ　phase.　The　more　the　σ　phase　is,　the　worse　the　corrosion　resistant　could　be.　©.