we can supply the square from 30*30-600*600mm, thickness: 3-25mm. and Material: Q235B, Q345B, ST 37, ST 44, ASTM A53 and so on. we can supply the square from 30*30-600*600mm, thickness: 0.8-25mm. and Material: Q235B, Q345B, ST 37, ST 44, ASTM A53 and so on. Square tubeZinc coating60-100g/m2Size15*15-300*300mm O.D tolerance±0.03W .T0.5-12.0mm Length4—14m,As customers require International ...