... )Wall thickness1.8mm-30mmstandardAPI5L,API5CT,ASTM-A106,ASTM-A53,SY5037-2000,GB/T5711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345 ... with black painting3)All the production process are made under ISO 9001-2000 strictly.ItemUnitIndexTesting method (standard )DensityKg /m 3≥60GB/T ... 8162-1999,ASTM A53-2007 Insulation Steel Pipe,API,PED,ISO certificate