Hot dip galvanized steel pipe 1).W.T:0.5-6.0mm 2).O.D:20-165mm 3).length:4-14m. TypePre galvanized steel pipeOuter diameterDN15 DN20 DN25 DN32 DN40 DN50 DN65 DN80 DN100 DN125 DN1501/2" 3/4" 1" 11/4" 11/2" 2" 21/2" 3" 4" 5" 6" 20mm 25mm 32mm 42mm 47mm 60mm 76mm 88mm 114mm 140mm 165mmWall thickness0.5-6.0mmLength4-14mStandardGB/T3091-2001, ASTM A53 , BS1387-1985MaterialQ195,Q215,Q235,Q345Zinc- ...