Nickel alloys / UNS N06625
Inconel® 625 is a nickel-chromium-molybdenum-niobium alloy combining high strength with outstanding resistance to pitting, crevice corrosion and seawater, from cryogenic temperatures to about 980 °C.
- UNS N06625
- W.Nr. 2.4856
- Spec ASTM B443
- Density 8.44 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | N06625 |
| W.Nr. | 2.4856 |
| EN | NiCr22Mo9Nb |
| Also known as | Alloy 625, 2.4856, NiCr22Mo9Nb, F625 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| 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 |
| Al | — | 0.40 |
| Ti | — | 0.40 |
| Co | — | 1.0 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 758 MPa (109.9 ksi) |
| Yield strength, 0.2% offset (min) | 379 MPa (55.0 ksi) |
| Elongation in 50 mm (min) | 30 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.44 g/cm³ | 0.305 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® 625: Offshore, chemical, aerospace, flue-gas systems. Chemical and petrochemical plant, sour-gas and oilfield equipment, furnace and heat-treatment hardware, power generation, marine engineering and aerospace components.
Inconel® 625 vs Hastelloy® C-276
| Inconel® 625 | Hastelloy® C-276 | |
|---|---|---|
| UNS | N06625 | N10276 |
| Key property | Strong, highly corrosion resistant | Most versatile corrosion-resistant alloy |
| Typical use | Offshore, chemical, aerospace, flue-gas systems | FGD, chemical reactors, pulp bleaching |
| Cr (wt %) | 20.0–23.0 | 14.5–16.5 |
| Ni (wt %) | 58.0 | Bal. |
| Mo (wt %) | 8.0–10.0 | 15.0–17.0 |
| C (wt %) | ≤ 0.10 | ≤ 0.010 |
| Tensile / yield (min, MPa) | 758 / 379 | 690 / 283 |
Frequently asked questions
What is the UNS number of Inconel® 625?
Inconel® 625 is designated UNS N06625 (W.Nr. 2.4856, EN NiCr22Mo9Nb).
What is Inconel® 625 used for?
Strong, highly corrosion resistant. Typical uses: offshore, chemical, aerospace, flue-gas systems.
Is Inconel® 625 magnetic?
Non-magnetic.
In which forms can I buy Inconel® 625 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® 625?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Inconel® 625 and Hastelloy® C-276?
Inconel® 625: strong, highly corrosion resistant. Hastelloy® C-276: most versatile corrosion-resistant alloy. 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.
Request a quote
Need Inconel® 625?
Send the grade, form, size, quantity and destination. Price on request — every offer is prepared against your specification.