... thickness1.8mm-30mmstandardAPI5L,API5CT,ASTM-A106,ASTM-A53,SY5037-2000,GB/T5711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345 ... ,10#,20#,45#,12CrMo,15CrMo,SS304,SS321packagingPainting,Caps,Bevel (beveled edges), ... the production process are made under ISO 9001-2000 strictly. External insulation steel pipes