Austenitic stainless
1.4539 Alloy 904L X1CrNiMoCu25-20-5
High-alloy super-austenitic with elevated nickel, molybdenum and copper for resistance to sulphuric and phosphoric acid and seawater; low carbon secures weld corrosion resistance.
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Chemical composition
mass %| Element | Content |
|---|---|
| CCarbon | ≤0.02 |
| SiSilicon | ≤0.7 |
| MnManganese | ≤2 |
| PPhosphorus | ≤0.03 |
| SSulphur | ≤0.01 |
| NNitrogen | ≤0.15 |
| CrChromium | 19–21 |
| CuCopper | 1.2–2 |
| MoMolybdenum | 4–5 |
| NiNickel | 24–26 |
Mechanical properties
room temperature- Rp0.2 min (N/mm²)
- 230
- Rp1.0 min (N/mm²)
- 250
- Rm (N/mm²)
- 520–720
- Elongation A% (longitudinal)
- 35
- Elongation A% (transverse)
- 30
- Impact energy KV J (longitudinal)
- 120
- Impact energy KV J (transverse)
- 90
Seamless tube.
Standard equivalences
- DIN/EN
- X1CrNiMoCu25-20-5
- AISI
- 904L
- UNS
- N08904
- SS
- 2562
- AFNOR
- Z1 NCDU 25.20
- BS
- 904 S13
- PN
- 0H22N24M4TCa
Typical applications
- Chemical plant and oil refineries
- Petrochemical plant
- Paper-industry bleach tanks
- Flue-gas desulphurisation
- Seawater, sulphuric- and phosphoric-acid service
Frequently asked questions
What is 1.4539 (Alloy 904L)?
1.4539 (X1CrNiMoCu25-20-5) — Austenitic stainless. High-alloy super-austenitic with elevated nickel, molybdenum and copper for resistance to sulphuric and phosphoric acid and seawater; low carbon secures weld corrosion resistance.
Which grades are equivalent to 1.4539?
1.4539 corresponds to EN X1CrNiMoCu25-20-5; equivalent designations: AISI 904L, UNS N08904, SS 2562, AFNOR Z1 NCDU 25.20, BS 904 S13, PN 0H22N24M4TCa.
Related grades
Indicative values — verify against the applicable standard before specifying.
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