Square steel pipe 10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42, St 52, Q 235, Q 195, Q345, 27SiMn Square steel pipe ProductionSquare steel pipeBrandXin hai fengSpecification20mm×40mm--250×250mm Thickness: 2.3mm--8mmOut Diameter20mm×40mm--250×250mmWall Thickness2.3mm--8mmLength6-12m. As customer's requestments.Plade of OriginShandong, ChinaTechniqueSeamless, weldedUsage1. Low and ...