Hardenable Nickel Based Alloy Steel Inconel 718 Precipitation
Inconel 718 - precipitation hardenable nickel-based alloy
The nickel-chromium alloy known as Alloy Nickel Inconel 718 is known for its high strength and corrosion resistance, and can be used at temperatures ranging from 423 to 1300 degrees Fahrenheit (253 to 705 degrees Celsius). This age-hardenable alloy is easy to fabricate into complex parts and has excellent welding properties. In addition to corrosion resistance and easy fabrication, it also has strong tensile, fatigue, creep, and rupture strengths.
Nickel Inconel 718 is used in a variety of applications due to its unique combination of properties, including cryogenic tankage, fasteners, structural components, liquid-fueled rockets, rings, and casings, as well as numerous formed sheet metal parts designed for land-based and aircraft gas generator engines.
Technology Steel & Materials offers nine sub-type specifications of Nickel Inconel 718, each in a unique form or shape.
- AMS 5589 (Tubing)
- AMS 5590 (Tubing)
- AMS 5596 (Foil, Plate, Sheet or Strip)
- AMS 5597 (Plate, Sheet or Strip)
- AMS 5662 (Bar, Forging, Ring or Custom Tube)
- AMS 5663 (Bar, Forging, Ring or Custom Tube)
- AMS 5664 (Bar, Forging, Ring or Custom Tube)
- AMS 5832 (Wire)
- AMS 5962 (Bar and Wire)
The Composition of Nickel Inconel 718
The composition of the particular alloy is the following:
| 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* |
*Not exclusively to the element mentioned, but that one predominates other elements that are used only in minimal quantities.
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