GI Square pipe/SHS/RHS/hollow section Grade:Q195-Q345,20#,45# and so on Standard:BS,ASTM,GB Mill Price Good quality Square Pipe1)Material: Q195/Q215/Q235,Q345,20#,45# etc.2)Size:20 x 20mm ---200 x 200mm and thickness: 0.8 - 12mm3)Length: 4-12M or as customer's special requirements;4)Surface: Galvanized or naked as customers' need;5)Product Type: Square pipe, Rectangular tubes, ERW tubes, Seamless ...