Circular　steel　tube　members　with　the　absence　of　anticorrosive　protection　or　coating　failure　are　prone　to　uniform　corrosion,　which　threatens　the　reliability　and　safety　of　members　in　the　atmospheric　environment.　To　fully　study　the　mechanical　behavior　of　uniformly　corroded　circular　steel　tubes,　compression　test　and　theoretical　analysis　were　conducted,　and　two　methods　considering　section　reduction　and　material　degradation,　respectively,　were　adopted　for　the　calculation　of　ultimate　load　carrying　capacities　of　specimens.　The　results　indicate　that　uniform　corrosion　did　not　change　the　failure　modes　of　specimens,　and　all　of　them　belonged　to　global　buckling　failure.　The　load　carrying　capacities　and　stiffness　of　specimens　decreased　with　the　increase　of　corrosion　ratio,　and　the　degree　of　reduction　was　greater　than　that　of　material　degradation,　showing　a　linear　relationship　with　the　corrosion　rate.　Under　the　same　corrosion　ratio,　the　specimens　with　larger　eccentricity　represented　more　obvious　load　carrying　capacity　and　stiffness　degradation.　The　load　carrying　capacities　predicted　by　both　methods　were　in　good　agreement　with　the　test　results　and　had　a　certain　safety　margin.　The　conservative　degree　of　calculation　results　from　three　specifications　followed　a　descending　order　of　ANSI/AISC　360-16,　GB　50017-2017,　and　EN　1993-1-1.　Under　the　same　corrosion　ratio,　the　load　carrying　capacity　variation　of　specimens　between　one-sided　corrosion　and　two-sided　corrosion　was　less　than　3%.　©　2020　by　the　authors.　Licensee　MDPI,　Basel,　Switzerland.