Stainless steel
Alloy 825 / 2.4858
Alloy 825 is a nickel-iron-chromium alloy with Werkstoffnummer 2.4858, EN NiCr21Mo. Molybdenum and copper give acid resistance beyond what 904L typically holds. It is not stainless 316L. INDUSTRISTÅL sources bar and plate from European mills and ships with 3.1. Alloy 625 when Mo and Nb have to go further up.
Typical applications
- Sulphuric acid and process
- Mixed acids
- Heat exchangers
Delivery conditions
- solution annealed
Designations
- W.Nr.
- 2.4858
- EN standard
- NiCr21Mo
- Group
- Stainless steel
Machinability and weldability
Yes, as a nickel alloy. Procedure – not 304 wire.
Sawing and machining
Sawing and cutting to size. State the form.
Certificates and documentation
EN 10204 3.1. UNS N08825 on the certificate when required.
Dimension programme
| Form | Range | Note |
|---|---|---|
| Round bar | Ø20–150 mm | Nickel. State Ø and certificate. |
| Flat bar | Cut to order | Stainless flat. |
| Plate | 3–30 mm thickness | Per job. |
| Seamless tube | Ø13.5–Ø508 mm | DN8–DN500. Wall up to 31 mm. ASME 1/4–16″. |
| Welded tube | Ø21.3–Ø610 mm | Welded stainless. Wall to ISO 1127. State whether the weld seam must be documented. |
| Fittings | Ø12–Ø2000 mm | ASME 1/2–60″ (Ø15–Ø1524 mm). Type A and B. Not a stock statement. |
| Flanges | Ø14–Ø2000 mm | ASME 1/2–60″ (Ø15–Ø1524 mm). PN 6–400. Not a stock statement. |
Parts of the range are held by European partners; other dimensions can be sourced. The range is not a current stock status in every diameter — stock is confirmed on enquiry.
Frequently asked questions
- What is Alloy 825?
- Ni-Fe-Cr with Mo and Cu. W.Nr. 2.4858. Not 316L.
- 825 or 904L?
- 904L is stainless steel. 825 is a nickel alloy for sharper acid.
- Do you supply Alloy 825?
- Yes, to order. State the form and dimension.
Read more
Send your enquiry
State grade, dimensions and quantity — or attach a drawing. We reply with a quote.