2205 Duplex Stainless Steel
1.4462
- EN1.4462
- ENX2CrNiMoN22-5-3
- AISI2205
- UNSS32205 / S31803
Ferritic-austenitic (duplex) stainless steel. Combines about twice the yield strength of austenitic steels with high pitting and stress corrosion cracking resistance in chloride media.
01Material Properties
- Rp0.2 ≥ 450 MPa (~2× 304)
- High pitting resistance (PREN ≥ 34)
- Resistance to chloride stress corrosion cracking
- Magnetic
- Service temperature −50 … +250 °C
02Applications
- Marine and offshore structures
- Chemical and petrochemical pressure vessels
- Seawater piping and pumps
- Pulp and paper equipment
- Desalination plants
03Delivery Condition
- Solution annealed (max. 270 HB); bar, plate, tube, forgings.
04Heat Treatment
Typical values
- Solution annealing
- 1020–1100 °C; rapid water cooling
- Hardening
- Not hardenable by heat treatment
- Range to avoid
- Prolonged holding at 300–1000 °C (sigma phase, 475 °C embrittlement)
- Welding
- Controlled heat input; matching consumables for phase balance
- Delivery condition
- Solution annealed, max. 270 HB
Heat treatment cycle (schematic)
Values are approximate and for information only; they vary with section size, heat and furnace conditions. Binding values are determined from the manufacturer’s data under laboratory conditions.
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