steel mill manufacture price Grade:Q195-Q235,20#,45#,A53 etc. Size:20x20-400x400mm. TCT:0.6-16.0mm steel mill 1)Material: Q195/Q215/Q235,20#,45# etc.2)Size:20 x 20mm ---400 x 400mm and thickness: 0.7 - 12mm3)Length:5.8m,6m,9m,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 &Welded steel ...