... 3.Size:thickness:1mm-25mm 4.Length:6m 2013 HIGH QUALITY AQUARE RETANGULAR STEEL PIPE 1.Grade:Q195, Q235B, Q235C, Q235D, Q345B, Q345C, ,ETC2 ... ' requirementSection 15*15mm-600*600mm, Section:35*15mm-600*400mm Application Mechanical equipment, solar energy equipment, steel structure, auto part, bridge pile ...