Nickel alloys / UNS N07718
Inconel® 718 is a precipitation-hardenable nickel-chromium alloy with very high strength up to about 650 °C, good fatigue and creep properties, and excellent weldability for an age-hardened alloy.
- UNS N07718
- W.Nr. 2.4668
- Spec ASTM B637
- Density 8.19 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | N07718 |
| W.Nr. | 2.4668 |
| EN | NiCr19NbMo |
| Also known as | Alloy 718, 2.4668, NiCr19NbMo |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| Ni | 50.0 | 55.0 |
| Cr | 17.0 | 21.0 |
| Fe | Bal. | — |
| Nb+Ta | 4.75 | 5.50 |
| Mo | 2.80 | 3.30 |
| Ti | 0.65 | 1.15 |
| Al | 0.20 | 0.80 |
| Co | — | 1.00 |
| C | — | 0.08 |
| Mn | — | 0.35 |
| Si | — | 0.35 |
| P | — | 0.015 |
| S | — | 0.015 |
| B | — | 0.006 |
| Cu | — | 0.30 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 1275 MPa (184.9 ksi) |
| Yield strength, 0.2% offset (min) | 1035 MPa (150.1 ksi) |
| Elongation in 50 mm (min) | 12 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.19 g/cm³ | 0.296 lb/in³ |
| Magnetic response | Non-magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets & plates | ASTM B168, B443, B409, B424, B127, B162 | 0.3 mm – 6 mm |
| Seamless pipe & tube | ASTM B167, B444, B407, B423, B165, B161 | 1/8" – 24" NB |
| Bars & rods | ASTM B166, B446, B408, B425, B164, B160 | 3 mm – 500 mm |
| Flanges & forgings | ASTM B564 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM B366 | 1/2" – 48" NB |
Corrosion & temperature resistance
Nickel-based alloys resist caustic alkalis, chloride stress-corrosion cracking and many acids, and keep their strength and oxidation resistance at temperatures where stainless steels fail.
Applications
Inconel® 718: Aerospace, oil & gas tools, fasteners. Chemical and petrochemical plant, sour-gas and oilfield equipment, furnace and heat-treatment hardware, power generation, marine engineering and aerospace components.
Inconel® 718 vs Inconel® X-750
| Inconel® 718 | Inconel® X-750 | |
|---|---|---|
| UNS | N07718 | N07750 |
| Key property | Age-hardenable, very high strength | Age-hardenable, relaxation resistant |
| Typical use | Aerospace, oil & gas tools, fasteners | Springs, bolts, turbine parts |
| Cr (wt %) | 17.0–21.0 | 14.0–17.0 |
| Ni (wt %) | 50.0–55.0 | 70.0 |
| Mo (wt %) | 2.80–3.30 | — |
| C (wt %) | ≤ 0.08 | ≤ 0.08 |
| Tensile / yield (min, MPa) | 1275 / 1035 | — |
Frequently asked questions
What is the UNS number of Inconel® 718?
Inconel® 718 is designated UNS N07718 (W.Nr. 2.4668, EN NiCr19NbMo).
What is Inconel® 718 used for?
Age-hardenable, very high strength. Typical uses: aerospace, oil & gas tools, fasteners.
Is Inconel® 718 magnetic?
Non-magnetic.
In which forms can I buy Inconel® 718 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dish Ends, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with Inconel® 718?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Inconel® 718 and Inconel® X-750?
Inconel® 718: age-hardenable, very high strength. Inconel® X-750: age-hardenable, relaxation resistant. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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