Alloy Wire International
Datasheet: Duplex
Duplex
Duplex stainless steels are magnetic and are far more corrosion resistant than more commonly used stainless grades, i.e. 302 and 316. Duplex is characterised by its high yield strength, as well as good fatigue strength and excellent corrosion resistance.
Duplex is also known as Duplex 2205 and Cronifer 2205 LCN.
Available in all profile options
Key Features
Duplex offers the following key features:
Greater corrosion resistance than stainless steel 300 series.
Greater pitting resistance and uniform corrosion resistance to stress corrosion cracking than stainless steel 300 series.
Good weldability.
Typical Applications
Duplex is known to be suitable for the following applications:
Chemical processing
Oil and gas refining
Marine environments
Pollution control equipment
Designations
W.Nr 1.4462
UNS S31803
2205
AWS 167
Specifications
ISO 15156-3
(NACE MR 0175)
Chemical Composition
The chemical composition of Duplex is indicated in the table below:
| Element | Min % | Max % |
|---|---|---|
| C | – | 0.03 |
| Si | – | 1.00 |
| Mn | – | 2.00 |
| P | – | 0.035 |
| S | – | 0.015 |
| Cr | 21.00 | 23.00 |
| Ni | 4.50 | 6.50 |
| Mo | 2.50 | 3.50 |
| N | 0.10 | 0.22 |
Alloy Details
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 | 1470 °C | 13.7 μm/m °C (21 – 100 °C) | 76.9 kN/mm² | 200 kN/mm² |
| 0.282 lb/in³ | 2680 °F | 7.610 x 10-6 in/in °F (70 – 212 °F) | 11154 ksi | 29008 ksi |
Heat treatment of finished parts
The typical heat treatment of 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 Duplex:
| Solution 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.
