High Strength
Age hardening develops high tensile and yield strength for demanding engineered components. The required heat-treatment condition should match the material specification.
INCONEL® · Product Details
INCONEL® Alloy 718
Nickel–Chromium Alloy · Age-Hardenable · UNS N07718
INCONEL® alloy 718 is an age-hardenable nickel-chromium alloy known for high strength, fatigue resistance and useful corrosion resistance. It combines tensile, fatigue, creep and rupture strength with good fabricability, including for complex components. Properties depend on product form, heat-treatment route and the governing specification.
Ni–Cr–Fe–NbAlloy system
8.19 g/cm³Reference density
1260–1336 °CReference melting range
Key Performance Characteristics
UNS N07718 / W. Nr. 2.4668
Fatigue & Rupture Performance
The alloy is used where fatigue resistance, creep strength and rupture performance are important design considerations.
Corrosion Resistance
INCONEL® 718 provides useful corrosion resistance in a range of environments, subject to the actual service medium and conditions.
Fabrication & Joining
The alloy can be fabricated into complex forms and is noted for good welding characteristics, including resistance to post-weld cracking.
Typical Application Areas
Aerospace & Gas Turbines
Selected engine components, rings, casings and formed sheet-metal parts.
Rocket & Cryogenic Systems
Selected liquid-fuel rocket components and cryogenic tankage.
Fasteners & Instrumentation
High-strength fasteners and selected instrumentation components.
Industrial Turbomachinery
Selected high-strength components where fatigue and elevated-temperature properties are required.
Chemical Composition
Limiting chemical composition, %
| Element | Composition limit |
|---|---|
| Nickel + Cobalt | 50.00–55.00 |
| Chromium | 17.00–21.00 |
| Iron | Balance |
| Niobium + Tantalum | 4.75–5.50 |
| Molybdenum | 2.80–3.30 |
| Titanium | 0.65–1.15 |
| Aluminum | 0.20–0.80 |
| Cobalt | 1.00 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. |
Physical Properties
Published reference values
| Property | Reference value |
|---|---|
| Density (annealed) | 8.19 g/cm³ |
| Melting range | 1260–1336 °C |
| Specific heat at approx. 21 °C | 435 J/(kg·°C) |
Mechanical Properties
Reference data by form and condition
| Form / condition | Tensile strength | 0.2% yield strength | Elongation | Hardness |
|---|---|---|---|---|
| Hot-rolled bar, aged; 0.625-in. test sample | 1424 MPa | 1237 MPa | 22% | 41 HRC |
Illustrative room-temperature test data for a specific hot-rolled and aged bar sample. INCONEL® 718 properties vary substantially with dimensions and heat treatment; the applicable product specification governs.
Discuss Your INCONEL® Alloy 718 Requirements
Tell us the required product form, dimensions, quantity, applicable standard and delivery condition. Our team welcomes inquiries from international industrial buyers.
Technical reference: Special Metals — INCONEL® alloy 718 technical bulletin