Super Duplex 2507
1.4410Super duplex stainless steel with PREN >40. Superior corrosion resistance to standard 2205 duplex, especially in chloride and H₂S environments. Used for subsea pipelines, offshore platform components, desalination plants, and chemical processing equipment.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS S32750 | S32750 | REF |
| 🇪🇺 | EN | Europe | X2CrNiMoN25-7-4 | 1.4410 | 100% |
| 🇺🇸 | ASTM | USA | SAF 2507 | — | 99% |
Sources: ASTM A240, EN 10088-2
Chemical composition comparison (wt%)
Side-by-side: Super Duplex 2507 (EN) (EN 10088-2) vs SAF 2507 (ASTM)
| Element | Super Duplex 2507 (EN) | SAF 2507 (ASTM) | Overlap |
|---|---|---|---|
| C | 0–0.03% | — | — |
| Si | 0–0.8% | — | — |
| Mn | 0–1.2% | — | — |
| P | 0–0.035% | — | — |
| S | 0–0.015% | — | — |
| Cr | 24–26% | — | — |
| Mo | 3–5% | — | — |
| Ni | 6–8% | — | — |
| N | 0.24–0.32% | — | — |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 730–930 | MPa |
| Yield Strength | ≥ 530 | MPa |
| Elongation | ≥ 20 | % |
| Hardness HB | ≤ 310 | HB |
| Elastic Modulus | ≥ 200 | GPa |
| Density | ≥ 7.8 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1050–1125 °C | water | Rapid cooling mandatory | Higher solution temp than 2205 due to higher alloy content. Critical to avoid sigma phase. |
Compatibility verdict
Super Duplex 2507 and SAF 2507: 99% composition match
Close equivalents but NOT identical.
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
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