Duplex stainless steels are magnetic and are far more corrosion resistant than more commonly used stainless grades, ie 302 and 316.
Duplex is also known as Duplex 2205 and Cronifer 2205 LCN.
| 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 |
Density
7.8 g/cm³ | 0.282 lb/in³
Melting Point
1470°C | 2680°F
Coefficient of Expansion
13.7 μm/m °C (21 – 100°C) | 7.610 x 10-6 in/in °F (70 – 212°F)
Modulus of Elasticity
200 kN/mm² | 29008 ksi
Modulus of Rigidity
76.9 kN/mm² | 11154 ksi
Add RowHeat Treatment of Finished Parts
| Condition as supplied by Alloy Wire | Type | Temperature | Time (Hr) | Cooling | |
| °C | °F | ||||
| Annealed or Spring Temper | Stress Relieve | 250 | 480 | 1 | Air |
Properties
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| N/mm² | ksi | °C | °F | |
| Solution Annealed | < 1000 | < 145 | -200 to +300 | -330 to +570 |
| Spring Temper | 1300 – 1900 | 189 – 276 | -200 to +300 | -330 to +570 |