1.1 This specification 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 This specification covers forged carbon steel piping components intended primarily for service in pressure piping systems from a specific temperature range where inherent notch toughness is desired, but where notch toughness testing is not required. In