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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'