Heat-resistant stainless steel
X20CrNiSi25-4 / 1.4821 stainless steel
X20CrNiSi25-4 / 1.4821 is a heat-resistant stainless steel. W.Nr. 1.4821. It holds its oxide scale in dry heat — it is not a 316L for wet chlorides. Typically supplied as seamless tube, welded tube.
- Delivery conditions
- solution annealed
- Also known as
- 1.4821, X20CrNiSi25-4
Designations
- W.Nr.
- 1.4821
- EN standard
- X20CrNiSi25-4
- Group
- Stainless steel
What it is used for
Furnace parts, flue gas and dry heat, where X20CrNiSi25-4 has to hold its scale.
Limits
Dry heat. Not a first choice in wet chlorides — that is 316L or duplex.
Delivery
We source X20CrNiSi25-4 from European mill partners as seamless tube, welded tube, cut to your dimensions and ship the certificate with the material. Typical condition: solution annealed. From a single cut length to full bundles — with no minimum charge.
Certificates and documentation
X20CrNiSi25-4 can be supplied with a material certificate to EN 10204, depending on producer, dimension and the requirements specified for the delivery. On stainless, the analysis and the delivery condition are what the certificate shows. If a specific test or an ageing/hardening condition is to be documented, it must be specified before we order. EN 10204 3.1 can be supplied on a wide range of our materials.
Dimension programme
| Form | Range | Note |
|---|---|---|
| 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. |
The range is a delivery programme, not a stock statement. Length is cut to your drawing.
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Send your enquiry
State grade, dimensions and quantity — or attach a drawing. We reply with a quote.