... OD: 30*30mm-800*800mm WT: 3-40mm Square steel pipeSpecification: 30-800mm thickness: 3-40mm material: Q235, Q345, ... , airport structure, shipbuilding, automobile axle pipe and so on.5) Packing: square shape bundles wrapped with strong steel strip or according to ... ) Plain or beveled ends8) OEM available 9)Certificates: CE,CCS square steel pipe