thick wall Carbon seamless Steel Pipe Sizes: 21.3 to920 mm ... GB/T, ASTM,JIS,DIN 3) certificate:API 5L Thick wall Carbon Seamless Steel Pipe ASTM A53 B/ Q3451) Sizes: ... )Steel Grade:10#,20#,45#,16Mn,Q345 BOuter packing:Wooden Cases,Canvas wrappedHexagonal shape bundles wrapped with strong steel ... High Quality, Good Price, Welcome to visit us! Thick wall Carbon seamless Steel Pipe ASTM A53 B