Alloy 825 pipes – 2.4858 nickel alloy pipes ASTM B423
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. ROHRLINE supplies Alloy 825 pipes and tubes to ASTM B423 with EN 10204 3.1 inspection certificates – worldwide.
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
Tell us the medium, temperature and pressure – we will check the grade with you.
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 | ≥ 241 MPa |
| Tensile strength Rm | ≥ 586 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.
Supply programme & machining
| Item | Details |
|---|---|
| Dimensions (pipe) | Programme range: outside Ø 10.2 to 2,032 mm · DN 6 to DN 2000 · all standard wall thicknesses; available sizes depend on grade and standard |
| As flange & fitting | DN 10 to DN 1200 · PN 6 to PN 400 · Class 150 to Class 2500 to ASME B16.5 (to NPS 24), above that ASME B16.47 to Class 900 |
| Lengths & cutting | Mill lengths, sawn fixed lengths and fitting pieces from 0.1 to 12 m – sawn and bevelled |
| Minimum quantity | From a single item – from one fitting piece to the complete piping system |
| Availability | Common grades and sizes available at short notice, special sizes procured per project |
| Lead time | Standard sizes usually 3–5 working days; the binding date is confirmed with the quote |
| Machining | Sawing and bevelling, roll grooving for grooved couplings, threading to EN 10226, drilling, facing, bending with special radii |
| Surface | Blasting, coating and marking to customer specification |
| Certificates | Mill certificate 2.2, inspection certificate 3.1 to EN 10204 (standard with machining), 3.2 with notified body on request |
| Testing | Non-destructive testing by ultrasound, eddy current and X-ray, pressure test report on request |
These figures describe our supply programme. Which size is actually available in this grade is clarified with your enquiry – you usually receive the quote the same day.
We clarify availability, price and inspection certificate with your enquiry.
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 825 (2.4858).
Which dimensions and certificates does ROHRLINE supply for Alloy 825?
ROHRLINE supplies Alloy 825 in the following range: Programme range: outside Ø 10.2 to 2,032 mm · DN 6 to DN 2000 · all standard wall thicknesses; available sizes depend on grade and standard. Documentation: Mill certificate 2.2, inspection certificate 3.1 to EN 10204 (standard with machining), 3.2 with notified body on request. Delivery worldwide; the binding date is confirmed with the quotation.
Typical industries
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.