... steel standard:ANSI pressure:150#-2500# ASTM SCH40 stainless steel flangesize1/2" - 24" ASME B16.525"- 60" ASME B16.47TypeWN, SO, SWF ... ,PN16,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME B16.5 & ASME B16.47materialCarbon steel (ASTM A105,A350 LF2,etc)Stainless ... A182 F12,F11,F22,F5,F9,F91,etc)Pipeline steel (ASTM A694 F42 F46 F52 F56 F60 F65 F70,etc)QualificationISO ...