1) Sizes: 1/8 to 24 inches 2) Standards: GB/T8163, ASTM A53, ASTM A106, JISG3452, JISG3454, DIN1629, API5L 3) Surface: oiled or black painted to prevent rust 4) Marking: as per customer's requirement Commonly used steel grade: 10 20 45 16Mn ST37 ST44 ST52 Q345 B Inner packing: Caps on two ends of every pipe Outer packing: Hexagonal shape bundles wrapped with strong steel trip or according to customers' requests