Duplex || S31803 || S32205 || 1.4462 || F51
Stainless steel
S31803 || S32205 belongs to the family of duplex steels. This type of steel is characterised by a higher resistance to corrosion than for instance the austenitic type S32750. Related to this, the tension elastic limit is higher by about 150%.
The use of stainless duplex steels, especially of the types S31803 || S32205, achieved its popularity through the unique combination of resistance to corrosion, resistance to stress corrosion as well as a high strength and tension elastic limit. These properties and the unique strength values will make this material indispensable also in the future. The relatively low nickel content as compared to standard austenites makes it interesting also from an economic point of view.
Special stainless steel
The steel is characterised by the following properties:
- Excellent resistance to pitting and crevice corrosion, PREN = ≥35
- Higher strength than conventional austenitic stainless steels
- Good weldability
- High resistance to general corrosion
- High resistance to acidic solutions
- High resistance to stress corrosion
DUPLEX applications
- Chemical industry
- Petrochemical industry
- Pulp / Paper industry
- Sea and seawater plants
- Flue gas systems
- Shipbuilding / Offshore
Chemical values – Reference analysis (weight proportion in %)
| Value | Proportion % |
|---|---|
| C | ≤ 0,03 |
| P | ≤ 0,03 |
| S | ≤ 0,020 |
| Si | ≤ 1,0 |
| Mn | ≤ 2,0 |
| Cr | 21 – 23 |
| Mo | 2,5 – 3,5 |
| Ni | 4,5 – 6,5 |
| N | 0,08 – 0,20 |
Mechanical values at room temperature
| Tensile strength N/mm² | 640 – 900 |
| Tension elastic limit Rp 0,2 N/mm² | ≥ 450 |
| Breaking elongation A5 % | 25 |
Assignment to current and older standards
- Designation according to DIN: x2 Cr Ni Mo N 22-5
- ASTM Grade: S 31803 / S 32205
- EN: 1.4462
- ASME: Duplex
- AFNOR: X2CrNiMoN 22-5-3
- SIS: 2377
- UNS: S31803 / S32205
- Vd TÜV 418: 1.4462
Tables and rates
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