This　paper　investigates　the　compressive　behavior　of　circular　hollow　stainless　steel　tubular　(CHSST)　stub　columns　after　being　exposed　to　elevated　temperature.　Altogether　fifty-one　specimens　were　tested,　forty-eight　of　which　were　exposed　to　elevated　temperature,　and　the　other　there　were　untreated.　The　main　parameters　discussed　are　as　follows:　temperature　(20　°C,　400　°C,　600　°C,　800　°C　and　1000　°C),　elevated　temperature　duration　(0,　30　min,　60　min,　90　min　and　120　min)　and　wall　thickness　(1.0　mm,　1.2　mm　and　1.5　mm).　The　results　show　that　elevated　temperature　does　not　affect　the　failure　mode　of　CHSST　stub　columns,　but　it　is　detrimental　to　the　ultimate　bearing　capacity,　with　a　maximum　loss　of　54.2　%.　Ductility　increased　for　1.2　mm　and　1.5　mm　specimens　at　800　°C,　while　remaining　unchanged　for　1.0　mm　specimens.　Extended　exposure　duration　had　negligible　influence　on　ultimate　capacity　below　800　°C　but　caused　notable　reduction　at　higher　temperatures.　Increased　wall　thickness　enhanced　both　capacity　and　ductility.　A　statistical　analysis　confirmed　the　consistency　of　the　test　data,　and　a　predictive　formula　for　post-fire　ultimate　capacity　was　developed.　Benchmarking　against　Eurocode　3　shows　that　the　proposed　model　offers　improved　accuracy　and　lower　variability,　supporting　its　application　in　post-fire　assessment　of　stainless　steel　tubular　columns.　©　2025