Product Name:Pre-Galvanized Square Pipes/Hollow Section Material:A53,Q195,Q215,Q235,Q345,16Mn, 20# Standard:ASTM A53 ,BS1387 Product Namepre galvanized square pipes/hollow sectionSizeSquare Tube Size:15*15--600*600mmThickness:0.5--20mmLength:3-12mSteel GradeA53,Q195,Q215,Q235,Q345,16Mn, 20#StandardASTM A500,BS1387 ,EN10219,GB/T6728,GB/T6728,GB/T6725,JIS G3466Usage1. For Structure, Airport, ...