Nickel Inconel Alloy 718
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Nickel 718 (UNS N07718), or Inconel 718 is a precipitation hardening nickel-chromium alloy that contains molybdenum, iron, columbium, and smaller traces of aluminum and titanium. Designed to exhibit significant yields, high strength, good ductility, and creep rupture properties up to 1300°F (704°C). These characteristics provide alloy 718 good formability, weldability, and cryogenic allowances compared to the metals other nickel based superalloys. The sluggish age hardening characteristics in alloy 718 also allow annealing and welding without the occurrence of spontaneous hardening during heating and cooling. This alloy is also non-magnetic, maintains significant corrosion and oxidation resistances and can be used in applications like jet engines, airframe components, and high temp bolts and fasteners.
| Chemical Composition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ni 52.5% | Cr 19.0% | Mo 3.05% | C | Nb 5.035% | |||||
| Mn | Si | P | S | Cu | |||||
| Co | |||||||||
| Physical Properties | |||||||
|---|---|---|---|---|---|---|---|
| Density | Electrical conductivity (% IACS) | Thermal conductivity (BTU-in/hr-ft²-°F) | Specific heat (BTU/lb-°F) | Thermal expansion (1/°F) | Thermal expansion | Melting Point (°F) | |
| 0.296 | 1.38 | 77 | 0.104 | 7.22E-06 | – | 2300 | |
| Mechanical Properties | ||
|---|---|---|
| PROPERTY | MINIMUM | MAXIMUM |
| Yield Strength Range (Rp0.2 Offset) (ksi) | 80 | 150 |
| Tensile Strength Range (Rm) (ksi) | 14 | 220 |
| Elongation (AL=5 x Ø) | 18% | 27% |
| Brinell Hardness (H) | 102 | 331 |
| Modulus of Elasticity (ksi) (E): 29600 | ||
| Machineability General Index: 12% | ||
Key Properties Of Nickel Alloy 718
- Excellent relaxation resistance
- Can be fabricated into even the most complex parts
- Offers a wide temperature range -423°F(-253°C) to 1300°F(705°C)
- Outstanding tensile, fatigue, creep, and rupture strength
- Gamma Prime strengthened
- Excellent oxidation resistance up to 1800°F(980°C)
- Available in annealed temper, aged, cold worked, or cold worked and aged
Inconel 718 Applications Including
- Gas turbine components
- Cryogenic storage tanks
- Jet engines
- Liquid fueled rocket motors and components
- Fasteners and instrumentation parts
- Nuclear fuel element spacers
- Hot extrusion tooling
- Down hole shafting and strength bolting
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