Alloy 825
Alloy 825 is a copper- and titanium-bearing nickel-iron-chromium alloy with high resistance to sulphuric and phosphoric acid and to stress-corrosion cracking.
Application & properties
Alloy 825 is a copper- and titanium-bearing nickel-iron-chromium alloy with high resistance to sulphuric and phosphoric acid and to stress-corrosion cracking.
- Sulphuric and phosphoric acid plants
- Pickling and process plants
- Chemicals with reducing and oxidising media
Chemical composition
Typical values in wt.-% per EN standard (heat analysis).
| Element | Content (%) |
|---|---|
| Ni | 38.0–46.0 |
| Cr | 19.5–23.5 |
| Mo | 2.5–3.5 |
| Cu | 1.5–3.0 |
| Ti | 0.6–1.2 |
| Fe | Bal. |
Mechanical properties
Typical values at room temperature per EN standard.
| Property | Value |
|---|---|
| Yield strength Rp0.2 | ≥ 235 MPa |
| Tensile strength Rm | ≥ 579 MPa |
| Elongation A | ≥ 30 % |
Standards, equivalents & product forms
| Topic | Detail |
|---|---|
| Standards | ASTM B423 / B424, VdTÜV |
| ASME/ASTM equivalent | ~ UNS N08825 |
| Material no. | 2.4858 |
| Short name / aka | NiCr21Mo · Incoloy 825 · UNS N08825 |
We supply Alloy 825 as pipes, flanges and fittings – seamless or welded, on request with an EN 10204 3.1 / 3.2 mill certificate.
Frequently asked questions about Alloy 825
What is Alloy 825 used for?
Above all in sulphuric and phosphoric acid technology and in pickling plants.
What is Incoloy 825?
Incoloy 825 is a trade name for the alloy Alloy 825 (2.4858).
Request Alloy 825?
Grade, standard, size, pressure rating and quantity are enough – on request with an EN 10204 3.1 / 3.2 mill certificate. Your quote usually the same day.
All data are typical values per the relevant EN standards for first orientation – without warranty. The applicable standard and the mill certificate of the delivery are decisive.