Solid　solution　treated　SAF3207　super　duplex　stainless　steel　with　nitrogen　content　of　0.51%　and　0.72%　were　treated　by　QPQ　process　respectively.　The　effects　of　QPQ　treatment　on　microstructure　and　wear　resistance　were　investigated　by　means　of　OM,　SEM,　XRD,　microhardness　tester,　friction　and　wear　tester.　Microstructure　observation　results　show　that　the　nitrided　layer　structure　of　the　SAF3207　stainless　steel　after　QPQ　treatment　is　composed　of　oxide　layer　(Fe　3　O　4　),　compact　compound　layer　(α　N　+S+CrN+ε)　and　diffusion　layer　(α　N　+S+CrN+γ＇)　from　the　surface　to　the　core.　Compared　with　the　low　nitrogen　steel　after　QPQ　treatment,　the　thickness　of　the　compound　layer　of　the　high　nitrogen　steel　is　smaller.　The　microhardness　variation　trend　of　the　nitrided　layer　first　increases　and　then　smoothes　and　finally　decreases　gradually　to　the　matrix　hardness,　and　the　maximum　hardness　is　up　to　850　HV0.2.　The　dry-sliding　friction　test　results　indicate　that　the　wear　resistance　of　SAF3207　hype　duplex　stainless　steel　is　significantly　improved　by　the　QPQ　treatment,　and　the　low　nitrogen　tested　stainless　steel　shows　better　wear　resistance　than　that　of　the　high　N　steel.　©　2016,　Editorial　Offce　of　＂Jinshu　Rechuli＂.　All　right　reserved.