Stainless　steel　circular　hollow　section　(CHS)　members　are　favoured　by　architects　and　structural　engineers　because　of　their　aesthetics,　superior　torsional　resistance　and　corrosion　resistance.　Hot-rolling　is　one　of　the　typical　production　processes　for　producing　CHS　members.　Nevertheless,　few　research　has　been　carried　out　concerning　the　hot-rolled　stainless　steel　CHS　members.　This　paper　reports　experimental　and　numerical　investigations　into　hot-rolled　seamless　stainless　steel　CHS　columns.　Flexural　buckling　tests　on　eight　columns　were　firstly　carried　out　in　the　experimental　investigation.　This　was　followed　by　numerical　modelling　investigation,　where　the　FE　models　were　developed　and　validated　against　the　test　results.　The　validated　FE　models　were　then　used　to　conduct　a　series　of　parametric　studies　to　obtain　more　data　covering　a　wide　range　of　member　slenderness　and　cross-section　sizes.　Based　on　test　and　FE　results,　three　existing　design　approaches　in　the　Eurocode,　Chinese　specification　and　American　specification　were　assessed　and　discussed.　The　assessment　results　show　that　the　three　design　approaches　all　provide　relatively　accurate　strength　prediction　on　the　whole,　but　the　design　approaches　in　the　19931-4　+　A2　and　ANSI/AISC　370-21both　give　overestimated　strength　predictions　while　design　approach　in　the　CECS　410　gives　a　relatively　conservative　strength　prediction　when　the　column　slenderness　is　small.　In　view　of　this,　new　column　design　curve　has　been　proposed,　with　its　advantage　over　the　existing　design　approaches　confirmed　by　quantitative　and　graphical　comparisons.