... stainless steel standard:ANSI pressure:150#-2500# ASTM SCH40 stainless steel flangesize1/2" - ... A, B, C, D, EstandardASME B16.5 & ASME B16.47materialCarbon steel (ASTM A105,A350 ... LF2,etc)Stainless steel (ASTM A182 F304, F304L, ... F316,F316L,F321, etc)Alloy steel (ASTM A694 ... ,F9,F91,etc)Pipeline steel (ASTM A694 F42 F46 F52 F56 F60 ...