Alloy Wire International
Datasheet: Super Duplex
Super Duplex
Duplex stainless steels are magnetic and are far more corrosion resistant than more commonly used stainless grades, i.e. 302 and 316. Super Duplex combines aspects of both austenitic and ferritic grades, and is known for its excellent corrosion resistance and high strength.
Super Duplex is also known as Alloy 32750 and SAF 2507.
Available in all profile options
Key Features
Super Duplex offers the following key features:
Excellent resistance to stress corrosion cracking in chloride-bearing environments.
Excellent resistance to pitting and crevice corrosion.
High resistance to general corrosion.
Typical Applications
Super Duplex is known to be suitable for the following applications:
Designations
W.Nr. 1.4410
UNS S32750
2507
AWS 169
Specifications
ISO 15156-3
(NACE MR 0175)
Chemical Composition
The chemical composition of Super Duplex is indicated in the table below:
| Element | Min % | Max % |
|---|---|---|
| C | – | 0.03 |
| Mn | – | 1.2 |
| Si | – | 0.80 |
| S | – | 0.015 |
| P | – | 0.035 |
| Cr | 24.0 | 26.0 |
| Ni | 6.0 | 8.0 |
| Mo | 3.0 | 4.5 |
| N | 0.24 | 0.35 |
| Cu | – | 0.5 |
| Fe | bal |
Alloy Details
Super Duplex density, melting point, coefficient of expansion, modulus of rigidity, and elasticity is indicated in the table below:
| Density | Melting Point | Coefficient of Expansion | Modulus of Rigidity | Modulus of Elasticity |
|---|---|---|---|---|
| 7.8 g/cm³ | 1350°C | 13.5 μm/m °C (25 – 100 °C) | 77 kN/mm² | 200 kN/mm² |
| 0.28 lb/in³ | 2460°F | 7.5 x 10-6 in/in °F (70 – 200 °F) | 11000 ksi | 29000 ksi |
Heat treatment of finished parts
The typical heat treatment of Super Duplex:
| Condition as supplied by AWI | Type | Temperature | Time | Cooling |
|---|---|---|---|---|
| Annealed or Spring Temper | Stress Relieve | 250 °C (480 °F) | 1 Hr | Air |
Properties
The typical mechanical properties of Super Duplex:
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <1100 N/mm² | <159 ksi |
| Approx. operating temperature | -200 to +300 °C | -330 to +570 °F |
| Spring Temper | ||
|---|---|---|
| Approx. tensile strength | 1300 – 1900 N/mm² | 189 – 276 ksi |
| Approx. operating temperature | -200 to +300 °C | -330 to +570 °F |
The above tensile strength ranges are typical. If you require different please ask.
