Standard: API, ASTM, BS, DIN, GB Standard2: API 5L, ASTM A53M-2007, BS 1139, BS 1387, DIN 2391, DIN 2444, GB/T 3091-2001, GB/T8162, GB/T8163 Grade Group: 10#-45#, A53-A369, Q195-Q345 Grade: 20#, 45#, A106(B,C), A53(A,B), Q195, Q215, Q235, Q345 Thickness: 0.5 - 20 mm Section Shape: Round Outer Diameter(Round): 15 - 325 mm Place of Origin: Shandong, China (Mainland) Application: Heating pipe Technique: ERW Certification: AS1163 Surface Treatment: Galvanized Special Pipe: Thick Wall Pipe Alloy Or Not: Non-alloy Zinc coating: 50-650g/m2 Ends: Beveled/Thread/Couplings/plain ends