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Inconel Alloy 718 is a precipitation hardenable nickel-based alloy designed to display exceptionally high yield, tensile and creep-rupture properties at temperatures up to 1300°F. The sluggish age-hardening response of alloy 718 permits annealing and welding without spontaneous hardening during heating and cooling. This alloy has excellent weldability when compared to the nickel-base superalloys hardened by aluminum and titanium. This alloy has been used for jet engine and high-speed airframe parts such as wheels, buckets, spacers, and high temperature bolts and fasteners.
Element | Limiting Chemical Composition (%) |
Nickel (plus Cobalt) | 50%-55% |
Chromium | 17%-21% |
Niobium (plus Tantalum) | 4.75%-5.50% |
Molybdenum | 2.80%-3.30% |
Titanium | 0.65%-1.15% |
Aluminum | 0.20%-0.80% |
Cobalt | 1% max |
Carbon | 0.08% max |
Manganese | 0.35% max |
Silicon | 0.35% max |
Phosphorus | 0.015% max |
Sulfur | 0.015% max |
Boron | 0.006% max |
Copper | 0.30% max |
Iron | Balance* |
Some typical applications are:
AMS Number | Alloy | Type | UNS | Cross Ref. Spec | Misc./Shape | |
---|---|---|---|---|---|---|
AMS 5590 | Inconel 718 | Nickel | N07718 | - | Tubing | ![]() |
AMS 5596 Foil | Inconel 718 | Nickel | N07718 | - | Foil | ![]() |
AMS 5596 Plate | Inconel 718 | Nickel | N07718 | - | Plate | ![]() |
AMS 5596 Sheet | Inconel 718 | Nickel | N07718 | - | Sheet | ![]() |
AMS 5596 Strip | Inconel 718 | Nickel | N07718 | - | Strip | ![]() |
AMS 5597 Plate | Inconel 718 | Nickel | N07718 | - | Plate | ![]() |
AMS 5597 Sheet | Inconel 718 | Nickel | N07718 | - | Sheet | ![]() |
AMS 5597 Strip | Inconel 718 | Nickel | N07718 | - | Strip | ![]() |
AMS 5662 Bar | Inconel 718 | Nickel | N07718 | - | Bar | ![]() |
AMS 5662 Custom Tube | Inconel 718 | Nickel | N07718 | - | Custom Tube | ![]() |
AMS 5662 Ring | Inconel 718 | Nickel | N07718 | - | Ring | ![]() |
AMS 5663 Bar | Inconel 718 | Nickel | N07718 | - | Bar | ![]() |
AMS 5663 Custom Tube | Inconel 718 | Nickel | N07718 | - | Custom Tube | ![]() |
AMS 5663 Ring | Inconel 718 | Nickel | N07718 | - | Ring | ![]() |
AMS 5664 Bar | Inconel 718 | Nickel | N07718 | - | Bar | ![]() |
AMS 5664 Custom Tube | Inconel 718 | Nickel | N07718 | - | Custom Tube | ![]() |
AMS 5664 Ring | Inconel 718 | Nickel | N07718 | - | Ring | ![]() |
AMS 5832 | Inconel 718 | Nickel | N07718 | - | Wire | ![]() |
AMS 5962 Bar | Inconel 718 | Nickel | N07718 | - | Bar | ![]() |
AMS 5962 Wire | Inconel 718 | Nickel | N07718 | - | Wire | ![]() |