... Q235,Q345,Q215,Q195 Outer diameter 20 ~ 219mm Wall thickness 0.8~ 12mm Standards ASTM-A53A, BS1387-1985, GB/T30 Galvanized Pipes ... ) introduction:Material:Q235,Q345,Q215,Q195Outer diameter: 20 ~ 219mmWall thickness: 0.8~ 12mmStandards: ASTM-A53A, BS1387-1985, GB/T3091-2001Galvanized Pipes ...