... ,carbon Standard:ASME,BS,GOST,etc API,ISO,CE,etc pipe fittingsSize -- Seamless:from 1/2" to 24" ,Welded:from 24" to ... ,WP5,WP9,WP91,16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910,15CrMo, 12Cr2Mo1; ASTM A335 P5, P9, P11, P12, P22, P91 ASTM A860 WPHY 70, WPHY ... , papermaking, construction, etcSpecial design available as the requirement of customer] seamless pipe fittings SCH40