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Alloy 718, often referred to as Inconel 718, is a high-strength, corrosion-resistant nickel chromium alloy supplied in the hot worked, solution annealed and age hardened condition. As with other types of Inconel, the Special Materials Corporation owns the trademark for Incoloy Alloy 718.
The addition of Nb, Ti, Al and Ni forms a series of precipitates during the controlled solution annealing and ageing process steps. This results in a significant increase in strength and hardness compared with alternative nickel alloys. These tensile and creep rupture properties are maintained from cryogenic to elevated temperatures. These properties make it suitable for applications between -250oC - 650oC.
As a nickel-chromium alloy, Inconel 718 possesses acceptable corrosion resistance in a range of environments including sea water, hydrogen sulphide, CO2, elemental sulphur and chloride ions over various temperatures. It is resistant to sulphide stress cracking and is capable of passing the sulphide stress corrosion test in accordance with NACE TM 0177 Method C solution A.
Furthermore, Alloy 718 also features exceptional welding properties - even in comparison to other Inconel alloys. As a result of these exceptional welding properties, Inconel Alloy 718 is suitable for a wide range of applications. We will go into further detail about these uses for Alloy 718 below.
|
Element
|
Percentage |
| Carbon | 0.08 max |
| Manganese | 0.35 max |
| Phosphorus | 0.015 max |
| Sulfur | 0.015 max |
| Silicon | 0.35 max |
| Chromium | 17-21 |
| Nickel | 50-55 |
| Molybdenum | 2.80-3.30 |
| Columbium | 4.75-5.50 |
| Titanium | 0.65-1.15 |
| Aluminum | 0.20-0.80 |
| Cobalt | 1.00 max |
| Boron | 0.006 max |
| Copper | 0.30 max |
| Tantalum | 0.05 max |
| Iron | Balance |
| Grade | UNS | DIN | EN | AMS | GB | JIS | |
| Inconel 718 | N07718 | - | 2.4668 | AMS 5596/5597 | - | - | |
| Solution Treated | Solution Treated and Aged | |
| Density | 0.296 lb/in3 (8.192 g/cm3) | 0.297 lb/in3 (8.22 g/cm3) |
| Specific Gravity | 8.19 | 8.22 |
| Melting Range | 2500-2600°F | 1370-1430°C |
| Temperature Range | Co-Efficients | ||
| °C | °F | W/m.K | Btu.ft/ft2.hr.°F |
| 0-100 | 532-212 | 6.5 | 11.2 |
| Yield Strength Min (0.2% offset) |
Ultimate Tensile Strength Min |
Elongation (% in 2") |
|
| Sheet and strip | 80,000 psi (550 MPa) | 140,000 psi (965 MPa) | 30 (min) |
| Plate | 105,000 psi (725 MPa) | 150,000 psi (1,035 MPa) | 30 (min) |
| Yield Strength Min (0.2% offset) |
Ultimate Tensile Strength Min |
Elongation (% in 2") |
| 150,000 (1,035 MPa) | 180,000 psi (1,240 MPa) | 12 (min) |
Typical short time tensile properties of Inconel 718 as a function of temperature are shown here for material solution treated and aged as follows:
Nickel Alloy 718 aerospace applications are jet engines, rocket motors, spacecraft, and fasteners. It is also used in oil and gas applications such as logging tools, pump shafts, fishing tools, and wellhead components.
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