The　effect　of　quench　polish　quench　(QPQ)　nitriding　temperature　on　the　microstructure　and　wear　resistance　of　SAF2906　duplex　stainless　steel　was　investigated.　Results　showed　the　surface　of　the　nitrided　samples　was　composed　of　an　oxidized　layer,　a　loose　compound　layer,　a　compact　compound　layer,　and　a　diffusion　layer.　The　oxidized　layer　was　composed　of　Fe3O4.　The　main　phases　of　the　loose　compound　layer　were　CrN,　alpha(N),　Fe2-3N,　and　Fe3O4.　The　compact　compound　layer　was　composed　of　CrN,　alpha(N),　and　Fe2-3N.　In　the　diffusion　layer,　CrN　and　expanded　austenite　(S)　were　the　main　phases.　The　nitrided　layer　thickness　increased　from　20　to　41　mu　m　with　an　increasing　temperature　of　570　to　610　degrees　C.　When　the　nitriding　temperature　was　above　590　degrees　C,　the　precipitates　in　the　diffusion　layer　became　coarsened,　and　their　morphologies　gradually　changed　from　spherical　particulate　to　rod-like　and　flocculent-like.　Tribotests　showed　the　cumulative　mass　loss　of　QPQ-treated　samples　was　much　lower　than　that　of　the　substrate.　The　cumulative　mass　loss　of　the　samples　nitrided　at　610　degrees　C　was　higher　than　that　at　570　degrees　C　during　the　first　29　h.　When　the　test　time　was　over　29　h,　the　former　was　lower　than　the　latter.