Welded square tubes manufacture price Grade:Q195-Q235,Q345,20#,45# etc. Thickness: ... naked as customers' need;5)Product Type: Square pipe, Rectangular tubes, ERW tubes, Seamless &Welded steel pipe, Galvanized steel pipe, etc.;6 ... :86-0317-5297898Fax:86-0317-5297889MB:86-15132790778 Welded square tubes