... Quick Details Standard: BS, GB, ASTMStandard: BS 1387, GB/T 3091-2001, ASTM A53-200... Grade: A53-A369, Q195-Q345Grade ... : A53(A,B), Q235, Q195, Q215Thickness: 0.8 - 12 mmSection Shape: RoundOuter Diameter: 21.3 - 219 mmPlace of Origin: ... steel pipe GB/T3091-2001BS1387-1985ASTM A53DIN244021.3 – 219mm 0.8 -- 12 mm3 – 12mAccordingtocustomers' requirementODtolerance WT tolerance +/- 0.1mm+/- ...