Square tube/pipe 

Quality standard: 

ASTM A500 ,ASTM A 53 ,EN 10210 ,EN 10219 

Steel grade: 

Q235, Q275, Q295, Q345, 20# and alloy

Out diameter:  From 150 mmx150mm to 800 mmx800mm

Wall thickness:  From 5mm to 30mm

Length:  3 mtr - 18 mtr as customer required

large diameter, thick wall thickness is our main product, be usded for building constructions,railway,subway,bridge,shipbuilding,war industry,etc, with many items for you to choose,high precision and prompt delivery, pls send you inquiry soon if you are searching this pipes.