Alloy 625 (also known as Inconel® 625) is a nickel-chromium-molybdenum alloy designed for outstanding corrosion resistance combined with high strength across a wide temperature range. Unlike precipitation-hardened superalloys, Alloy 625 achieves its strength primarily through solid-solution strengthening, meaning it offers robust mechanical performance without requiring a complex aging treatment. This makes it a reliable choice for corrosive service in demanding process and marine environments.
The high nickel content provides excellent resistance to chloride-induced stress corrosion cracking, while chromium supports oxidation resistance and molybdenum improves resistance to pitting and crevice corrosion. As a result, Alloy 625 is widely used wherever seawater, brines and aggressive chemical media are present. In addition, it is known for good weldability and formability, allowing fabrication into components, piping systems and custom-cut parts (depending on specification and thickness).
Alloy 625 is referenced as Werkstoff 2.4856 in Europe and as UNS N06625 internationally. Steelinox B.V. supplies this alloy in several product forms such as round bar, forgings, plates, custom-cut plates and tubes. Chemical composition, mechanical properties and inspection requirements depend on the applicable product standard and delivered condition and are confirmed on the EN 10204 / 3.1 certificate.
| Element | Typical range (wt. %) |
|---|---|
| Ni | ≥ 58.0 |
| Cr | 20.0 – 23.0 |
| Mo | 8.0 – 10.0 |
| Nb + Ta | 3.15 – 4.15 |
| Fe | ≤ 5.0 |
| C | ≤ 0.10 |
| Mn | ≤ 0.50 |
| Si | ≤ 0.50 |
| 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 (annealed) |
|---|---|
| Tensile strength (Rm) | ≥ 760 MPa |
| Yield strength (Rp0.2) | ≥ 414 MPa |
| Elongation (A5) | ≥ 30 % |
| Hardness | approx. ≤ 240 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 product form and delivered condition.
Inconel® 625 / Alloy 625 (W.Nr. 2.4856 / UNS N06625) is available in multiple semi-finished and fabricated forms. Availability depends on the required standard, delivery condition and inspection requirements.
Alloy 625 is typically supplied in annealed condition but can be delivered in other conditions depending on project requirements.
Round bar: 10 mm – 330 mm (other dimensions available on request)
Forgings: on request
Plates: on request
Custom-cut plates: on request
Tubes: on request
Dimensions and availability depend on product form, specification, wall thickness and inspection requirements.
Centerless grinding available on request. Provide diameter, tolerance, straightness and surface finish requirements for precision shafts or components.
Alloy 625 is commonly referenced as Inconel® 625. In Europe it is also known as Werkstoff 2.4856, and internationally it is specified as UNS N06625. These designations refer to the same alloy family, with exact requirements depending on the applicable standard and product form.
The combination of high nickel, chromium and molybdenum content provides excellent resistance to general corrosion, pitting and crevice corrosion in many aggressive environments. The high nickel content also helps resist chloride-induced stress corrosion cracking, which is a common failure mode in marine and chemical service.
No. Alloy 625 achieves its strength primarily through solid-solution strengthening. In many applications, annealed material provides the required mechanical performance. If a specific condition is required by a standard or project specification, this should be stated when ordering.
Yes. Alloy 625 is widely used in welded fabrications due to its good weldability and resistance to many corrosive environments. It can also be formed both cold and hot, depending on thickness and fabrication route. Welding procedures and any heat treatment requirements depend on the applicable specification and component design.
Alloy 625 retains strength and oxidation resistance over a wide temperature range and is used in thermal process equipment, exhaust-related components and energy applications. Temperature capability and corrosion performance depend on environment and design code. For critical cases, selection should be based on the relevant standard data and project requirements.
Steelinox B.V. supplies Alloy 625 (2.4856 / UNS N06625) in round bar, forgings, plates, custom-cut plates and tubes. Round bar is typically available from 10 mm to 330 mm, with other dimensions on request. Availability depends on specification, wall thickness and inspection requirements.
Alloy 625 can be supplied as seamless or welded tubes (depending on specification), and related piping components such as fittings and flanges may be available on request. For piping projects, it is recommended to specify the required standard (ASTM/ASME or EN), size range and wall thickness class.
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
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