1.1 ,This specification2 covers forged carbon steel piping components intended primarily for service in pressure piping systems from −,20 to +650 °,F [−,30 to +345 °,C] where inherent notch toughness is desired, but where notch toughness testing is not required. Included are forged or ring-rolled flanges, forged fittings, and valves made to specified dimensions, or to dimensional standards such as the ASME and API specifications referenced in Section 2.