1.4539 (904L)
1.4539 (904L) is a high-alloy, copper-bearing super-austenite with high resistance to sulphuric acid and aggressive media.
Application & properties
1.4539 (904L) is a high-alloy, copper-bearing super-austenite with high resistance to sulphuric acid and aggressive media.
- Sulphuric-acid and pickling plants
- Chemical and process plants with aggressive media
- Flue-gas desulphurisation
Chemical composition
Typical values in wt.-% per EN standard (heat analysis).
| Element | Content (%) |
|---|---|
| C | ≤ 0.020 |
| Cr | 19.0–21.0 |
| Ni | 24.0–26.0 |
| Mo | 4.0–5.0 |
| Cu | 1.2–2.0 |
| N | ≤ 0.15 |
Mechanical properties
Typical values at room temperature per EN standard.
| Property | Value |
|---|---|
| Yield strength Rp0.2 | ≥ 220 MPa |
| Tensile strength Rm | 520–720 MPa |
| Elongation A | ≥ 35 % |
Standards, equivalents & product forms
| Topic | Detail |
|---|---|
| Standards | EN 10216-5, EN 10088 |
| ASME/ASTM equivalent | ~ UNS N08904 |
| Material no. | 1.4539 |
| Short name / aka | X1NiCrMoCu25-20-5 · 904L |
We supply 1.4539 (904L) as pipes, flanges and fittings – seamless or welded, on request with an EN 10204 3.1 / 3.2 mill certificate.
Frequently asked questions about 1.4539 (904L)
What is 904L used for?
Above all in sulphuric-acid and pickling technology and with aggressive chemicals where 316L is no longer sufficient.
Why is 904L so resistant?
Its high nickel, molybdenum and copper content makes it particularly acid-resistant.
Request 1.4539 (904L)?
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.