... ,carbon Standard:ASME,BS,GOST,etc API,ISO,CE,etc pipe fittingsSize -- Seamless:from 1/2" to 24" ,Welded:from 24" to ... ,4D,5D,6D,7D-40D.Thickness--SCH10,SCH20,SCH30,STD SCH40, SCH60, XS, SCH80., SCH100, SCH120, SCH140, SCH160, XXSStandard --ASME B16 ... , papermaking, construction, etcSpecial design available as the requirement of customer] seamless pipe fittings SCH40