Where temperatures are moderate and corrosion resistance is not critical.
Where cold temperature (-50°F) impact strength is essential.
To minimize graphitization encountered with carbon and carbon moly steels at high temperatures.
Where elevated temperature, surface stability, and greater strength than F11 are needed.
With moderately corrosive fluids and in oil refineries where high temperature stability and oxidation resistance of the lower alloy steels are inadequate.
For services where the higher chrome alloys are preferred and where high temperature stability and oxidation resistance of the lower alloy steels are inadequate.
For corrosion resistance applications where high temperature strength is required. Has restricted carbon level to minimize sensitization. Do no use for service temperatures above 1000°F.
For corrosion resistance applications where extreme high temperature service is expected. Has a restricted carbon range for high temperature strength above 1000°F.