... Application:decoration,construction.machine etc. welded rectangular steel tubes specification:square pipe,oval pipe,round pipe.Standard :AISI, ASTM, GBApplication: Construction, decoration, ... WeldedWelding Line Type: ERWCertification: ISOOuter Diameter: 9.5mm-133mmsquare pipe:from 20*10mm--100*50mmThickness: 0.24mm to 3mmLength: 6M ... , bright annealed Origin:Foshan,China welded rectangular steel tubes