Alloy 718 (also known as Inconel® 718 / Nickel 718) is a precipitation-hardenable nickel-chromium superalloy with additional alloying elements such as iron, niobium (Nb), molybdenum (Mo), aluminium (Al) and titanium (Ti). The alloy is engineered to deliver very high strength together with excellent corrosion and oxidation resistance over a wide temperature range, making it a preferred material for demanding aerospace, energy and high-performance engineering applications.
A key characteristic of Alloy 718 is its strong response to heat treatment: solution treatment followed by precipitation aging develops high yield and tensile strength as well as good fatigue performance. In addition, the alloy offers outstanding weldability compared to many other nickel-based superalloys, including good resistance to post-weld cracking. For elevated-temperature service, Alloy 718 is known for excellent creep rupture strength up to approximately 700°C, depending on condition, section size and applicable standard.
In Europe, Alloy 718 is also referenced as Werkstoff 2.4668 and internationally as UNS N07718. Steelinox B.V. supplies this material in a variety of product forms, including round bar, forgings, sheets/plates and cut-to-size sheet. Mechanical properties and inspection requirements depend on product form and heat treatment condition, and are confirmed on the EN 10204 / 3.1 certificate supplied with each delivery.
| Element | Typical range (wt. %) |
|---|---|
| Ni | 50.0 – 55.0 |
| Cr | 17.0 – 21.0 |
| Fe | Balance |
| Nb + Ta | 4.75 – 5.50 |
| Mo | 2.80 – 3.30 |
| Ti | 0.65 – 1.15 |
| Al | 0.20 – 0.80 |
| C | ≤ 0.08 |
| Mn | ≤ 0.35 |
| Si | ≤ 0.35 |
| P | ≤ 0.015 |
| S | ≤ 0.015 |
Exact melt composition is confirmed on the EN 10204 / 3.1 certificate for the supplied batch.
| Property | Typical value (solution treated & aged) |
|---|---|
| Tensile strength (Rm) | ≥ 1240 MPa |
| Yield strength (Rp0.2) | ≥ 1030 MPa |
| Elongation (A5) | ≥ 12 % |
| Hardness | approx. 330 – 380 HB |
| Impact toughness | per standard / see EN 10204 3.1 certificate |
Exact values are stated on the material certificate EN 10204 / 3.1. Properties depend on heat treatment condition and product form.
Inconel® 718 / Nickel 718 / Alloy 718 (Werkstoff 2.4668 / UNS N07718) is supplied in several semi-finished and cut-to-size forms. The alloy is commonly delivered in a condition suitable for subsequent heat treatment by the customer, or solution treated and aged depending on the product standard and application.
Round bar: 3.0 mm – 304.8 mm (other sizes on request)
Forgings: on request
Sheets / plates: on request
Sheet cut to size: on request
Availability depends on product form, standard, delivery condition and inspection requirements.
Centerless grinding available on request. Provide diameter, tolerance, straightness and surface finish requirements for precision shafts or rotating components.
Alloy 718 is widely known as Inconel® 718 or Nickel 718. It is also referenced as Werkstoff 2.4668 in Europe and as UNS N07718 in international specifications. These designations refer to the same alloy family, with exact requirements depending on the applicable standard and product form.
Alloy 718 is a nickel-based superalloy rather than a stainless steel. This gives it significantly higher strength and temperature capability. It retains load-bearing capacity at temperatures where many stainless steels would lose strength, which is why it is used in aerospace, turbines and other high-temperature, high-stress applications.
Yes. Alloy 718 achieves its high strength through solution treatment followed by precipitation aging. The selected heat treatment condition has a major influence on tensile strength, yield strength, hardness and fatigue performance. The delivered condition and test values are confirmed on the EN 10204 / 3.1 certificate.
Alloy 718 is known for outstanding weldability compared to many other nickel-based superalloys, including good resistance to post-weld cracking. Welding procedures and any post-weld heat treatment depend on component thickness, service requirements and the applicable specification.
The alloy offers excellent creep rupture strength and oxidation resistance at elevated temperatures. It is commonly used up to approximately 700°C, depending on condition, design and environment. For critical high-temperature designs, selection should be based on the relevant standard data and project requirements.
Yes. Alloy 718 can be supplied as precision round bar and, on request, as centerless ground shafts for tight tolerances and improved surface finish. This is commonly required for rotating parts and highly stressed components. Provide diameter, tolerance, straightness and surface requirements when requesting a quote.
Steelinox B.V. supplies Alloy 718 (2.4668 / UNS N07718) in round bar, forgings, sheets/plates and sheet cut to size. Round bar is available from 3.0 mm up to 304.8 mm, with other sizes on request. Availability depends on product form, specification and inspection requirements.
Deliveries are supplied with an EN 10204 / 3.1 inspection certificate. This certificate confirms chemical composition, mechanical test results (where applicable) and the delivered condition according to the relevant standard.
Certificates: EN 10204 / 3.1
PDF data sheet Request a quote
↑ Back to topLeave your telephone number here, we will call you back as soon as possible.
You can call us at +31 (0) 186 651004 or send an email to info@steelinox.nl