Square Steel Pipe : 1. More Thickness: 3.0-22.0mm 2. Advanced Roller Extrusion equipment line. 3.Certification:CE,ISO SpecificationsSquare Steel Pipe 1. More Thickness: 1.0-22.0mm 2. Advanced Roller Extrusion equipment line. 3.Certification:CE,ISO1. STANDARD:GB/T3094-2000, GB/T6728-2002, ASTM A500, JIS G 3466, DIN EN 10210, GB/T178-20052. MATERIAL:Q195, Q215, Q235, Q275, Q345, 20#, 45#, Stainless ...