ASTN A 694 is a standard specification for Carbon and Alloy Steel Forgings for pipe flanges, fittings, valves, and parts for high pressure transmission service.
It covers forged or rolled steel pipe flanges, forged fittings, valves and parts suitable for the use with high strength transmission service pipe. There are several grades of material based on minimum yield strength requirements. F-60 indicates a minimum yield strength of 60ksi.