Duplex 2205 / S31803 / S32205 Round Bars
Duplex 2205 is a nitrogen enhanced ferritic-austenitic stainless steel with a microstructure of roughly equal parts ferrite and austenite. This balance gives it twice the yield strength of 316L, excellent resistance to chloride stress corrosion cracking and good resistance to pitting and crevice corrosion, along with better resistance to erosion and fatigue than standard austenitic grades.
Nexforge Alloys manufactures and stocks Duplex 2205 round bars in the solution annealed condition to ASTM A276 / A479 (UNS S31803 and the higher nitrogen S32205 version). Bars are ferrite checked and can be supplied with ASTM A923 (intermetallic phase) and ASTM G48 corrosion test reports for offshore and process industry applications.
Duplex 2205 round bars (UNS S31803 / S32205, W.Nr. 1.4462, F51) from 6 mm to 350 mm diameter, solution annealed, as per ASTM A276 / A479 / A182.
Duplex 2205 Round Bar Specification
| Parameter | Details |
|---|---|
| Alloy Designations | Duplex 2205, UNS S31803, UNS S32205, W.Nr. 1.4462, ASTM A182 F51 / F60 |
| Standards | ASTM A276, ASTM A479, ASME SA479, ASTM A182 (forged), EN 10088-3, NORSOK M-630 MDS D45/D47 |
| Size Range | 6 mm to 350 mm diameter |
| Length | Random 3 to 6 metres, or cut to length |
| Condition | Solution annealed at 1020 - 1100 °C and water quenched |
| Surface Finish | Hot rolled pickled, peeled, centreless ground, bright, rough turned |
| Tolerance | h9 / h10 / h11 or as per drawing |
| Testing | Chemical, tensile, impact, hardness, ferrite count, ASTM A923, ASTM G48, UT on request |
| Certification | EN 10204 3.1 mill test certificate; 3.2 on request |
Chemical Composition (% by weight)
| Grade (UNS) | C | Mn | Si | P | S | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| Duplex S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 - 23.0 | 4.5 - 6.5 | 2.5 - 3.5 | 0.08 - 0.20 | Balance |
| Duplex S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 0.14 - 0.20 | Balance |
Mechanical Properties
| Grade | Tensile Strength (min) | 0.2% Yield Strength (min) | Elongation (min) | Hardness (max) | PREN | Density |
|---|---|---|---|---|---|---|
| S31803 | 620 MPa (90 ksi) | 450 MPa (65 ksi) | 25 % | 290 HB / 31 HRC | ≥ 33 | 7.80 g/cm³ |
| S32205 | 655 MPa (95 ksi) | 450 MPa (65 ksi) | 25 % | 290 HB / 31 HRC | ≥ 35 | 7.80 g/cm³ |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- Yield strength roughly double that of 304L / 316L
- Excellent resistance to chloride stress corrosion cracking and corrosion fatigue
- Good pitting and crevice corrosion resistance (PREN 33 - 36)
- Lower nickel content gives stable pricing compared to austenitic grades
Applications
- Pump shafts, impellers and valve components in oil and gas and desalination
- Heat exchanger and pressure vessel components
- Chemical tankers and cargo handling equipment
- Pulp and paper digesters and bleaching equipment
- Structural and fastener applications in marine environments