Inconel® 718 (Alloy 718) — UNS N07718 / W.Nr. 2.4668
Inconel 718 (also known as Alloy 718) is a high-strength, corrosion-resistant, age-hardenable nickel-chromium-iron-molybdenum alloy designed for demanding service from -423°F to 1300°F. It is well known for excellent tensile strength, fatigue resistance, creep strength, and rupture strength at elevated temperatures. In addition, Alloy 718 provides strong resistance to oxidation and aqueous corrosion, making it a reliable choice for critical components in harsh industrial environments.
Key Advantages
-
Age-hardenable alloy offering high strength and excellent stability at elevated temperatures
- Strong fatigue, creep, and rupture strength for demanding rotating and pressure-bearing components
- Excellent resistance to corrosion, oxidation, and aqueous corrosion
- Widely accepted in critical industries with mature standards and supply forms
Typical Applications
Inconel 718 is used across multiple industries where both strength and corrosion resistance are required. Common application scenarios include:
| Industry |
Typical Components |
| Aerospace |
Turbine discs, compressor blades, critical aircraft engine parts |
| Gas Turbine Engines |
Turbine wheels, seals, combustion chamber hardware |
| Oil & Gas |
Downhole tools, wellhead components, sour-service equipment |
| Nuclear |
Reactor-related components requiring long-term strength & corrosion resistance |
| Chemical Processing |
Valves, pumps, fasteners for hot & corrosive media |
| Automotive / Industrial Turbines |
Turbocharger rotors, exhaust components, high-temperature hardware |
Technical Data
Chemical Composition (Typical, %)
| Element |
Content |
| Nickel (Ni) |
50–55% |
| Chromium (Cr) |
17–21% |
| Iron (Fe) |
Remainder |
| Niobium + Tantalum (Nb+Ta) |
4.75–5.50% |
| Molybdenum (Mo) |
2.8–3.3% |
| Titanium (Ti) |
0.65–1.15% |
|
Aluminum (Al) |
0.2–0.8% |
| Cobalt (Co) |
1.0% max |
| Manganese (Mn) |
0.35% max |
| Silicon (Si) |
0.35% max |
| Phosphorus (P) |
0.015% max |
| Sulfur (S) |
0.015% max |
| Carbon (C) |
0.08% max |
| Boron (B) |
0.006% max |
| Copper (Cu) |
0.3% max |
Physical Properties
| Property |
Value |
| Density (Annealed) |
0.296 lb/in³ |
| Density (Annealed & Aged) |
0.297 lb/in³ |
| Melting Range |
2300–2437°F (1260–1336°C) |
| Specific Heat @ 70°F (21°C) |
0.104 Btu/lb°F (435 J/kg°C) |
| Curie Temperature (Annealed) |
< -320°F (< -196°C) |
| Curie Temperature (Annealed & Aged) |
-170°F (-112°C) |
| Permeability @ 200 Oe & 70°F (Annealed) |
1.0013 |
| Permeability @ 200 Oe & 70°F (Annealed & Aged) |
1.0011 |
Mechanical Properties (Typical at 20°C / 68°F)
| Yield Strength (Rp0.2) |
Tensile Strength (Rm) |
Elongation (A) |
Reduction of Area (Z) |
| 1030 MPa (149.4 ksi) |
1280 MPa (185.6 ksi) |
12% |
15% |
Available Product Forms & Standards
Standard product forms include pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon, and wire. Supply can be provided with material certification (MTC) upon request.
| Product Category |
Common Standards |
| Bar, Rod, Wire & Forgings |
ASTM B637 / ASME SB637 |
| Seamless Pipe & Tube |
ASTM B983 / ASME SB983 |
| Plate, Sheet & Strip |
ASTM B670 / ASME SB670; ASTM B906 / ASME SB906 |
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Note: Typical values shown are for reference. Final supply can be provided to your required specification and heat-treatment condition.
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