An　economical　nickel-saving　casting　duplex　stainless　steel　(DSS)　Cr25Mn10Mo4Ni2N　was　melted　in　a　mid-frequency　induction　furnace.　The　effect　of　solution　temperature　on　microstructure　and　corrosion　resistance　property　of　the　DSS　were　studied　by　means　of　optical　microscope(OM),　X-ray　diffraction(XRD),　scanning　electron　microscopy(SEM)　and　electrochemical　workstation.　The　results　indicate　that　the　microstructure　consists　of　α,　γ　and　σ　phases　for　the　steel　solution-treated　at　temperatures　of　1000　to　1100　℃.　With　increasing　solution　temperature,　the　morphology　of　σ　phase　changes　from　fine　island　into　thick　one.　As　the　solution　temperature　is　increased　to　1120　℃,　the　σ　phase　completely　disappears,　and　the　microstructure　only　contains　α　and　γ　phases.　After　solution-treated　at　1120　℃,　the　steel　has　the　lowest　corrosion　current　density　and　the　largest　charge　transfer　resistance　in　artificial　seawater,　which　shows　it　has　excellent　pitting　corrosion　resistance.　At　the　temperature　of　1150　℃,　its　pitting　corrosion　resistance　is　poorer.　When　the　solid-solution　temperature　is　increased　from　1000　℃　to　1100　℃,　its　pitting　corrosion　resistance　of　the　steel　is　improved.