Square steel pipe 10#,20#,45#,16Mn, ASTM A106 Gr. ... Q 235, Q 195, Q345, 27SiMn Square steel pipe ProductionSquare steel pipeBrandXin hai fengSpecification20mm×40mm--250×250mm Thickness: 2 ... 's requests.4. Painting varnish coating on the pipe.5. Plastic caps at ends.Delivery Time15-20 ... rolled steel pipe6. spiral steel pipe7. hot-galvanized steel pipe Specification (mm)Thickness(mm) 20×401.3--3.025 ...