Stainless steel
904L / 1.4539 stainless steel
904L is a highly alloyed austenitic stainless steel with Werkstoffnummer 1.4539, EN X1NiCrMoCu25-20-5. Copper and high nickel give better acid and chloride resistance than 316L. INDUSTRISTÅL supplies bar, plate and tube, saws or cuts to size and ships with 3.1. 1.4547 when 6 % Mo has to be included. Duplex when the strength also has to go up.
Typical applications
- Chemical process
- Flue gas scrubbing
- Marine-related
Delivery conditions
- solution annealed
Designations
- W.Nr.
- 1.4539
- EN standard
- X1NiCrMoCu25-20-5
- AISI/SAE
- 904L
- SS (Sweden)
- 2562
- UNS
- N08904
- Group
- Stainless steel
Chemical composition
Typical range according to EN 10088-3 (ladle analysis)
| Element | Range |
|---|---|
| C | max. 0.020 % |
| Si | max. 0.70 % |
| Mn | max. 2.00 % |
| P | max. 0.030 % |
| S | max. 0.010 % |
| Cr | 19.0–21.0 % |
| Ni | 24.0–26.0 % |
| Mo | 4.0–5.0 % |
| Cu | 1.20–2.00 % |
| N | max. 0.15 % |
1.4539 / X1NiCrMoCu25-20-5. Copper and high nickel are what separate 904L from 316L.
Machinability and weldability
Yes. L carbon. Use filler for 904L – not 316 wire.
Sawing and machining
Sawing, cutting to size, tube to dimension.
Certificates and documentation
EN 10204 3.1 as standard.
Dimension programme
| Form | Range | Note |
|---|---|---|
| Round bar | Ø20–150 mm | Per job. |
| Flat bar | Cut to order | Stainless flat. |
| Plate | 3–40 mm thickness | Not 316L by another name. |
| 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 904L?
- 1.4539, X1NiCrMoCu25-20-5. Austenite with Cu, above 316L.
- Is 1.4539 the same as 904L?
- Yes. 904L is the AISI name, 1.4539 is the W.Nr.
- Do you supply 904L round bar?
- Yes. Bar, plate and tube. State the form and size.
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Send your enquiry
State grade, dimensions and quantity — or attach a drawing. We reply with a quote.