Duplex Specification
- W.NR 1.4462
- UNS S31803
Applicable Standards:
- NACE MR0175 / ISO 15156-3
Duplex stainless steels are magnetic and are far more corrosion resistant than more commonly used stainless grades, ie 302 and 316.
| Good Mechanical Properties at Elevated Temperatures | No |
| Corrosion Resistant at Ambient Temperatures | Yes |
| Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures | No |
| Oxidation Resistant | No |
| Precipitation Hardenable | No |
Applications include:
- Chemical processing
- Oil and gas refining
- Marine environments
- Pollution control equipment
| Approximate Chemical Composition | |
| Cr | 21 – 23 % |
| Ni | 4.5 – 6.5 % |
| Mo | 2.5 – 3.5 % |
| N | 0.08 – 0.2 % |
| Fe | BAL |
| Properties | ||
| DENSITY | 7.8 g/cm3 | 0.282 lb/in3 |
| MELTING POINT | 1470°C | 2680°F |
| COEFFICIENT OF EXPANSION | 13.7 µm/m °C (21 - 93°C) |
7.610 x 10-6 in/in
°F (70 - 200°F) |
| MODULUS OF RIGIDITY | 200 kN/m2 | 29008 ksi |
| MODULUS OF ELASTICITY | 76.9 kN/m2 | 11154 ksi |
| CONDITION OF SUPPLY | HEAT TREATMENT (AFTER FORMING) |
| Annealed/Spring Temper | Stress relieve at 250°C (480°F) for 1 hour and air cool. |
| CONDITION | APPROX TENSILE STRENGTH | APPROX SERVICE TEMPERATURE | ||
| Solution Annealed | 600 - 750 N/mm2 | 87 - 109 ksi | -200 to +300°C | -330 to +570°F |
| Spring Temper | 1300 - 1900 N/mm2 | 189 - 276 ksi | ||
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