... .8mm-30mm Standard:API5L,API5CT,ASTM A106,ASTM A53, TypeGrade B steel pipeSize1/2-26inch (diameter)Wall thickness1.8mm-30mmStandardAPI5L,API5CT ... ,ASTM A106,ASTM A53,SY5037-2000,GB/T9711.1-1997MaterialX42,X52,X60,X70,Q235,Q345,10 ... .3,all the production process are made under the ISO9001-2000 strictly