Galvanized seamless Pipe OD: 21.3mm-339mm Thickness: 1.8mm-12mm Standard: BS1387, ASTMA53, GB/T3091-2001 galvanized seamless ... -30mmStandardAPI5L,API5CT,ASTM-A106,ASTM-A53,SY5037-2000,GB/T9711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345,10#,20#,45 ...