In　this　paper,　effects　of　solid　solution　treatment　temperature　on　microstructure　and　tensile　properties　of　casting　SAF　2507　super　duplex　stainless　steel　were　researched　by　means　of　optical　microscope　(OM),　scanning　electron　microscope　(SEM),　energy　dispersive　spectrometer　(EDS)　and　tensile　test.　The　results　indicate　that　the　amount　of　γ　phase　increases　according　to　a　linear　relationship　φ(γ)　=　-0.134T　+159.94　during　the　temperatures　from　1100　°C　to　1250°C.　Tensile　properties　of　casting　SAF　2507　super　duplex　stainless　steel　fluctuate　with　solution　temperature　change.　Austenitic　grain　size　and　morphology　are　the　most　important　factors　on　tensile　property.　The　tensile　strength　is　the　highest　owing　to　the　finest　austenitic　grain　at　the　solution　temperature　of　1150°C.　The　elongation　is　related　to　the　fracture　mode.　At　1100°C,　elongation　ration　is　highest　because　of　the　ductile　fracture.