Physical properties
| Density | 7.8 | g/cm³ |
| Modulus E | 200 / 194 / 186 / 180 | GPa @ 20 / 100 / 200 / 300 °C |
| Thermal conductivity | 15 | W/(m·K) @ 20 °C |
| Thermal expansion | 13.0 / 13.5 / 14.0 | 10⁻⁶/K, mean 20-100 / 20-200 / 20-300 °C |
| Specific heat | 500 | J/(kg·K) @ 20 °C |
| Resistivity | 0.8 | Ω·mm²/m @ 20 °C |
Informative values: they vary with composition, condition and test method. Use the governing standard or measured mill data for pressure and heat-transfer calculations.
Values are taken from EN 1.4462 (the same alloy) and are informative.
Duplex grades are magnetic.
Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements5 elements | |||
| Fe | Iron | Bal. | |
| Cr | Chromium | 22 – 23% | |
| Ni | Nickel | 4.5 – 6.5% | |
| Mo | Molybdenum | 3 – 3.5% | |
| N | Nitrogen | 0.14 – 0.2% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual5 elements | |||
| C | Carbon | ≤ 0.03% | |
| Mn | Manganese | ≤ 2% | |
| Si | Silicon | ≤ 1% | |
| P | Phosphorus | ≤ 0.03% | |
| S | Sulphur | ≤ 0.02% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Bar and forgings | |||||
| Bar and shapes | Condition A, hot- or cold-finished, all sizes | ≥ 655 (95 ksi) | ≥ 450 (65 ksi) | ≥ 25 | Also specified: Hardness ≤ 290 HBW |
| Bars (EN 10088-3, ≤160 mm) | +AT (solution annealed) | 650 – 880 | ≥ 450 | ≥ 25 | Also specified: Hardness ≤ 270 HBW KV ≥ 100 J longitudinal. |
| Pressure forgings (EN 10222-5, ruling section ≤350 mm) | +AT (solution annealed) | 680 – 880 | ≥ 450 | ≥ 30 | Tangential/transverse A ≥ 25 %; KV ≥ 200/100 J (long./tang.). |
| Plate, sheet and strip | |||||
| Plate, sheet and strip | Solution treated | ≥ 655 (95 ksi) | ≥ 450 (65 ksi) | ≥ 25 | Also specified: Hardness ≤ 293 HBW / 31 HRC |
| Cold-rolled strip (EN 10088-2, ≤8 mm) | +AT (solution annealed) | 700 – 950 | ≥ 500 | ≥ 20 | |
| Hot-rolled plate (EN 10088-2, ≤75 mm) | +AT (solution annealed) | 640 – 840 | ≥ 460 | ≥ 25 | Hot-rolled strip (≤13.5 mm): Rm 700–950 MPa, otherwise as here. KV ≥ 100/60 J (long./transv., over 10 mm). |
| Tube and pipe | |||||
| Heat-exchanger and instrument tubing | Solution treated at 1870–2010 °F [1020–1100 °C], water quenched or otherwise rapidly cooled | ≥ 655 (95 ksi) | ≥ 485 (70 ksi) | ≥ 25 | |
| Seamless and welded pipe | 1870–2010 °F [1020–1100 °C], rapid cooling in water or by other means | ≥ 655 (95 ksi) | ≥ 450 (65 ksi) | ≥ 25 | Also specified: Hardness ≤ 290 HBW / 30 HRC H₂S service: NACE MR0175 / ISO 15156-3 limits H₂S partial pressure (10 kPa max up to 232 °C) and requires the solution-annealed condition with 35–65 % ferrite. |
| Electric-fusion-welded pipe with filler metal | Post-weld solution treatment 1870–2010 °F [1020–1100 °C], rapid cooling in air or water | ≥ 655 (95 ksi) | ≥ 450 (65 ksi) | ≥ 25 | Also specified: Hardness ≤ 290 HBW / 30 HRC Mechanical properties follow the plate used. |
| Seamless pressure tubes (EN 10216-5, wall ≤30 mm) | +AT (solution annealed) | 640 – 880 | ≥ 450 | ≥ 22 | Cold-finished, solution-annealed tubes: Rm max. 920 MPa. KV ≥ 150/100 J (long./transv.), at −40 °C ≥ 40 J transverse. |
| Welded pressure tubes (EN 10217-7, wall ≤30 mm) | +AT (solution annealed) | 700 – 920 | ≥ 450 | ≥ 25 | Transverse A ≥ 20 %; KV ≥ 120/90 J (long./transv.), at −40 °C ≥ 40 J transverse. |
| Fittings and flanges | |||||
| Fittings | Solution treated | ≥ 655 (95 ksi) | ≥ 450 (65 ksi) | ≥ 20 | Also specified: Hardness ≤ 290 HBW |
Where this grade is recommended
Matched in 4 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Flowlines (chlorides) | Oil & Gas | 80 – 150 °C | 4 / 9 | 86 |
| Ballast & tank systems | Marine & Offshore | ≤ 40 °C | 7 / 10 | 85 |
| Separators & heat-exchanger internals | Oil & Gas | 120 – 250 °C | 4 / 10 | 84 |
| Flue-gas desulphurisation | Environmental & FGD | 80 – 180 °C | 10 / 11 | 82 |
Designations & equivalents
| UNS | S32205 / S31803 |
| W.Nr. (Germany) | 1.4462 |
| EN designation | X2CrNiMoN22-5-3 |
| Trade name(s) | 2205 / SAF 2205 / Uranus 45N |
| ASTM / AISI | A240 / A276 / A313 / A479 / A484 / A789 / A790 / A815 / A928 |
| JIS (Japan) | SUS329J3L |
S32205 and S31803 are not automatically interchangeable — state the UNS number on the order, or order dual-certified S32205 / S31803 where both must be met.
More detail 1
S32205 requires at least 22.0 % Cr, 3.0 % Mo and 0.14 % N, S31803 at least 21.0 %, 2.5 % and 0.08 %; their A240 plate tensile minima are 655 and 620 MPa.
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
15 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is 2205 Duplex · UNS S32205?
2205 Duplex · UNS S32205 — Duplex stainless steel. The workhorse duplex — flowlines, process equipment, offshore structures
What is the maximum service temperature of S32205?
Typically about 280 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of S32205?
The specified minimum tensile strength is 655 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover S32205?
ASTM A240, ASTM A276, ASTM A313, ASTM A479, ASTM A484, ASTM A789, ASTM A790, ASTM A815, ASTM A928, EN 10088-2 (sheet, plate, strip), EN 10088-3 (bar, rod, wire, sections), EN 10216-5 (seamless pressure tubes), EN 10217-7 (welded pressure tubes), EN 10222-5 (forgings for pressure purposes), ASTM A182
Where is S32205 typically used?
Flowlines (chlorides) (Oil & Gas); Ballast & tank systems (Marine & Offshore); Separators & heat-exchanger internals (Oil & Gas); Flue-gas desulphurisation (Environmental & FGD)
In which forms is S32205 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
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