Our company main produce steel pipe, have a good quality and reputation, the specification is following 1. SEEMLESS STEEL PIPE: size: 76mm-630mm material: 10# - 20# etc. standard: GB8162 (structural pipe) GB8163 (fluid pipe) DIN1626, 1629, 17175, ST35.8 (German standard) ASTM A 106 B/A53 B, etc, foreign standard. 2. Straight Weld tube, ERW pipe; size: 76mm-630mm material: Q235 A, B .16Mn Q345 A, B If you are interested in our product, please contact with me