... ,carbon Standard:ASME,BS,GOST,etc API,ISO,CE,etc pipe fittingsSize -- Seamless:from 1/2" to 24" ,Welded:from 24" to ... ,,A234WPC,A420WPL6. 20#,Q235,10#,20#,A3, Q235A, 20G,16Mn, DIN St37, St45.8, St52.4,St.35.8,St.35 ... , papermaking, construction, etcSpecial design available as the requirement of customer] seamless pipe fittings SCH40