ASTM A182 F5 F9 F11 F12 F22 F91 Flanges A182 F9 Alloy Steel Blind Flanges
The flanges can be threaded, ring type joint, lap joint, weld neck or socket welded.
The flange have to be avoided in extremely corrosive conditions. ASTM A182 F12 Lap Joint Flange is designed with a stub end and a ring-type lap joint. These flange are utilized in applications where there are space constraints. ASME B16.5 SA 182 Gr F22 Pipe Flanges were firstly developed for use on small size high pressure piping. Their static strength is equal to A182 F22 Steel Slip On Flanges, but their fatigue strength is 50% greater than that of double-welded Alloy Steel F22 Slip On flanges. Production of ASME SA182 F9 WNRF Flange is to be done with an alloy that contains lower content of carbon. Lowering the content of carbon in these alloys reduces the formation of carbide precipitates. Which would essentially mean that the Alloy Steel F9 Flanges would no longer be susceptible to intergranular corrosion in the heat affected weld zone.