... steel standard:ANSI pressure:150#-2500# Welded flange PN16size1/2" - 24" ASME B16.525"- 60" ASME B16.47TypeWN, SO, SWF, BL, OF,LF ... ,PN25,PN40/ Class A, B, C, D, EstandardASME B16.5 & ASME B16.47materialCarbon steel (ASTM A105,A350 LF2,etc)Stainless steel ... F70,etc)QualificationISO,API,CE/PED to euro,etc Welded flange PN16