This　study　investigates　the　structural　performance　and　section　classification　of　austenitic　stainless　steel　welded　Isection　flexural　members　subjected　to　monotonic　and　cyclic　loading.　Finite　element　models　of　the　stainless　steel　welded　I-section　beams　were　developed　using　the　finite　element　software　ABAQUS,　and　the　validity　of　the　finite　element　model　was　verified　based　on　existing　experimental　research　on　stainless　steel　welded　I-section　member.　A　comprehensive　series　of　parametric　analyses　were　conducted　using　the　validated　finite　element　model　to　evaluate　the　load-bearing　capacity　and　rotation　capacity　of　the　stainless　steel　flexural　members　under　different　loading　conditions.　Additionally,　the　rationality　of　the　width-to-thickness　ratio　limits　for　different　section　classes,　as　outlined　in　the　European　stainless　steel　standard　EN　1993-1-4　and　the　Chinese　steel　structure　design　standard　GB　50017-2017,　was　assessed.　The　results　indicate　that　there　is　a　significant　correlation　between　the　effect　of　the　width-to-thickness　ratio　of　different　components　of　the　section　on　the　section　load-carrying　capacity　and　rotation　capacity.　For　austenitic　stainless　steel　welded　I-section　flexural　members,　the　section　classification　limits　outlined　in　EN　1993-1-4　are　conservative,　whereas　those　in　GB　50017-2017　are　conservative　for　certain　sections　but　may　be　unsafe　for　others.　Furthermore,　the　loading　conditions　significantly　affect　structural　performance　and　should　be　considered　in　the　section　classification.　Consequently,　an　innovative　section　classification　method　was　proposed,　considering　the　correlation　of　section　components,　and　new　width-to-thickness　ratio　limits　for　austenitic　stainless　steel　I-section　flexural　members　were　established　for　various　section　classes　under　both　monotonic　and　cyclic　loading.