The astm a182 specification covers both forged or rolled low alloy as well as stainless steel pipe components for use in pressure systems. This sa 182 gr f91 flange is often used in environments, where the temperature settings are almost always elevated. The astm a182 specification components include fittings, flanges, Valves, and other similar parts that can be constructed up to the ... https://www.shasanpiping.com/alloy-steel-f91-flanges-manufacturers-exporters-suppliers-stockists.html