hot dipped galvanized scaffolding steel pipe 1. Standard:ASTM A53, GB/T3091 2. Material: A53 GrB, Q215, Q235, Q345 3. WT:1.5-3.5mm4. OD:48.3mm5. Main Market: Southeast Asia, the Middle East, Africa, South America6. Coating: oiled , hot dipped galvanized, red or black painting