... pipe: Q195, Q215, Q235, Q345, X52, X60 STK500, or per the buyers demand. 3) Standards: BS1387, ASTM A or B, GB/T3081 ... or outer welded stab can be removed 5) Dimension of the pipe: A)Outside diameter: From OD20mm to OD273.1MM B ... pipe: 5.8m, 6m, 11.8m or 12m, or per the buyers demand