The　limited　surface　hardening　depth　of　duplex　stainless　steel　(DSS)　through　conventional　ultrasonic　surface　rolling　process　(USRP),　attributed　to　its　high　strength　and　plastic　deformation　resistance,　remains　a　critical　technical　challenge.　This　study　proposes　a　novel　hybrid　thermal-field　assisted　USRP　(H-USRP)　strategy　to　achieve　superior　surface　strengthening　for　2205　DSS.　Systematic　investigations　were　conducted　on　the　corrosion　behavior　and　tribological　performance　under　extreme　temperatures　(400　degrees　C,　25　degrees　C,-60　degrees　C)　and　artificial　seawater　environments.　The　synergistic　interaction　between　thermally　induced　plasticity　and　severe　plastic　deformation　during　H-USRP　generates　ultra-refined　surface　grains,　simultaneously　improving　surface　finish　(63.11　%　roughness　reduction),　hardness　(10.88　%　increase),　and　hardening　depth　(103.43　%　enhancement)　compared　to　conventional　USRP.　Notably,　H-USRP　modified　surfaces　exhibit　62.5　%　enrichment　of　Cr2O3　in　passive　films　and　79.17　%　reduction　in　corrosion　rate.　The　wear　volume　under　high-temperature,　cryogenic,　and　corrosive　conditions　decreases　by　10.92　%,　16.43　%,　and　19.37　%,　respectively,　with　concurrent　reduction　in　friction　coefficients.　Particularly　under　1.0　V　applied　potential,　H-USRP　effectively　suppresses　corrosive　wear　through　55.34　%　decreased　corrosion　current　and　reduced　synergistic　damage　(Delta　Wfccontribution　decreased　to　57.15　%).　These　findings　demonstrate　that　the　proposed　H-USRP　strategy　significantly　improves　surface　integrity　and　strengthening　depth,　enabling　superior　long-term　service　performance　of　DSS　components　in　extreme　operating　conditions.