Duplex (austenitic-ferritic)
1.4507 Super Duplex 255 X2CrNiMoCuN25-6-3
Copper-bearing super-duplex (255) combining high strength with strong resistance to pitting and stress-corrosion cracking in chloride and acid service.
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Chemical composition
mass %| Element | Content |
|---|---|
| CCarbon | ≤0.03 |
| SiSilicon | ≤0.7 |
| MnManganese | ≤2 |
| CrChromium | 24–26 |
| MoMolybdenum | 2.7–4 |
| NiNickel | 5.5–7.5 |
| NNitrogen | 0.15–0.3 |
| CuCopper | 1–2.5 |
Mechanical properties
room temperature- Rp0.2 min (N/mm²)
- 475
- Rm (N/mm²)
- 690–940
Seamless tube.
Standard equivalences
- DIN/EN
- X2CrNiMoCuN25-6-3
- AISI
- Super Duplex 255
- UNS
- S32550
Typical applications
- Chemical and petrochemical processing
- Seawater desalination
- Shipbuilding
- Offshore and sour-gas service
Frequently asked questions
What is 1.4507 (Super Duplex 255)?
1.4507 (X2CrNiMoCuN25-6-3) — Duplex (austenitic-ferritic). Copper-bearing super-duplex (255) combining high strength with strong resistance to pitting and stress-corrosion cracking in chloride and acid service.
Which grades are equivalent to 1.4507?
1.4507 corresponds to EN X2CrNiMoCuN25-6-3; equivalent designations: AISI Super Duplex 255, UNS S32550.
Related grades
Indicative values — verify against the applicable standard before specifying.
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