ERW Black welded steel Tube( Square Hollow section/Rectangle Hollow Section)
Tube carré/rectangle acier noir
Material:Q195/Q215/Q235/Q345
Size: 10 x 10mm – 300 x 300mm  (Square section)
Size: 8 x 16mm – 50 x 100mm  (Rectangle section)
Thickness: 0.30mm to up
Regular Length : 5.8 Metre or 6.0metre, according to customers' requirements
Standards: GB/T6728, ASTM-A500, JIS-G3466,BS
Surface: lightly oil , include black, bright and pre-galvanized