Super duplex stainless steel 1.4410 (UNS S32750): Technical Data Sheet and Material Overview
Special stainless steel
Corrosion Resistance of Super Duplex Steel S32750
Super duplex stainless steel 1.4410 provides excellent resistance to localized corrosion mechanisms such as pitting and crevice corrosion. Its high PREN value (Pitting Resistance Equivalent Number) of 38 or higher underlines its suitability for use in aggressive chloride-containing environments. The material also performs well in acidic solutions and is resistant to general and stress corrosion cracking.
Processing and Heat Treatment
Solution annealing is carried out at temperatures between 1040 and 1120 °C, followed by rapid cooling in water or air. Hot forming should take place in the range of 1200 to 1000 °C. The material shows good weldability and can be processed using standard techniques for duplex steels.
Applications of S32750 Super Duplex
Due to its excellent corrosion and strength properties, S32750 material is widely used in:
- Chemical industry
- Petrochemical industry
- Pulp and paper industry
- Seawater and desalination plants
- Flue gas cleaning systems
- Shipbuilding and offshore technology
- Mechanical and plant engineering
Chemical values – Reference analysis
(weight proportion in %)
| Value | Proportion % |
|---|---|
| Carbon (C): | min. 0 % - max. 0.03 % |
| Manganese (Mn): | min. 0 % - max. 2.00 % |
| Silicon (Si): | min. 0 % - max. 1.00 % |
| Phosphorus (P): | min. 0 % - max. 0,035 % |
| Sulfur (S): | 0 % - max. 0.015 % |
| Chromium (Cr): | 24 % – 26 % |
| Molybdenum (Mo): | 3.5 % – 4.5 % |
| Nickel (Ni): | 6 % – 8 % |
| Nitrogen (N): | 0.24 % – 0.35 % |
Mechanical Properties at Room Temperature
| Hardness (HB): | ≤ 290 |
| Yield strength (Rp0.2): | ≥ 530 N/mm² |
| Tensile strength: | 730 – 930 N/mm² |
| Stretching(A5,65): | ≥ 25 % |
| Elastic modulus: | 200 kN/mm² |
Physical Properties at 20 °C
| Density: | 7.8 kg/dm³ |
| Electrical resistance: | 0.8 Ω·mm²/m |
| Magnetizability | present |
| Thermal conductivity: | 15 W/m·K |
| Specific heat capacity: | 500 J/kg·K |
Designations and Material Standards of super stainless steel S32750
| DIN: | X2CrNiMoN25-7-4 |
| EN: | 1.4410 |
| UNS: | S32750 |
| ASTM Grade: | S32750 |
| AISI: | F53 |
| ASME: | Superduplex |
| AFNOR: | X2CrNiMoN 22-5-3 |
| SIS: | 2377 |
| Vd TÜV: | 508 |
Tables and rates
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