Hebei Borun can supply square hollow section/square tubes according to standards like: GB/T3094-2000, GB/T6728-2002, EN10219, EN10210, ASTM A500, JIS G3466 etc. 

You may check the production flow chart as below to get more: 

1) Dimensions: 30*30mm-400*600mm,  Thickness: 2-25mm        Length: <13m

2) Material: Q195, Q235, Q345, 20#, 16Mn, ST37/44/ST52, ASTM A53/106, STKR490/STKR400, ASTM A500 GR, S355, S275, S235

3) Standards: JISG 3466, DIN EN 10210, DIN EN10219, ASTM A500, GB/T 3094-2000, GB/T 6728-2002

4) Applications: construction structure, machinery making, container, hall structure, offshore oil field, sea trestle, motorcar cassis, airport structure, shipbuilding, automobile axle pipe and so on.

5) Packing: in bundles with strong steel strips or according to customers' requests

6) Surface: oiled or black painted to prevent rust

7) OEM available                

8)Certificates: CE,CCS

9) Mini order: 30MT for S355JR; 80MT for S355JO,S355J2H