Sheet and strip is intended for elevated temperature applications where high strength and resistance to oxidation is desired for parts and assemblies which may be formed or welded and subsequently age-hardened to improve their strength properties at elevated temperatures.

The alloy has relatively good creep and stress rupture characteristics at temperatures up to 1500°F, but with stress rupture values somewhat lower than obtainable in the same alloy for bar stock. Fabricating operations such as cold forming and welding may determine the age-hardening treatments employed, for which the manufacturer should be consulted.

The testing of material in the age-hardened condition (1300°F for 20 hours, followed by air cooling) (see 3.5.1) is intended for control purposes to indicate ability of the alloy to respond adequately to age-hardening. It is not intended that this treatment will necessarily be used for the thermal treatment of parts or assemblies after forming or welding. For such treatments the manufacturer should be consulted.

The alloy shows low-load loss or relaxation for spring applications, with moderate stresses, at temperatures up to about 1000°F.