... to meet customers' needs with the satisfied service and high standard quality.1. Features: High Frequency Welded2. Zinc:200g/m2, 300g/m2 ... , 400g/m2.3. Material: Q195, Q215, Q235, Q345, STK5004. Standard: GB/T3091-2001, BS1378-1985, ASTM A53, EN5. Usage: used ... -2002, BS1387-1985, ASTM A-53, GB/T3091-2001 other standard pipe, complete product specifications.Exports to Europe, North America, the ...