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 1.4410 (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 | 24 – 26% | |
| Ni | Nickel | 6 – 8% | |
| Mo | Molybdenum | 3 – 5% | |
| N | Nitrogen | 0.24 – 0.32% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual6 elements | |||
| C | Carbon | ≤ 0.03% | |
| Mn | Manganese | ≤ 1.2% | |
| Si | Silicon | ≤ 0.8% | |
| Cu | Copper | ≤ 0.5% | |
| P | Phosphorus | ≤ 0.035% | |
| 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 | |||||
| Bars (EN 10088-3, ≤160 mm) | +AT (solution annealed) | 730 – 930 | ≥ 530 | ≥ 25 | Also specified: Hardness ≤ 290 HBW KV ≥ 100 J longitudinal. |
| Pressure forgings (EN 10222-5, ruling section ≤160 mm) | +AT (solution annealed) | 800 – 1000 | ≥ 500 | ≥ 30 | Tangential/transverse A ≥ 25 %; KV ≥ 200/100 J (long./tang.). |
| Plate, sheet and strip | |||||
| Plate, sheet and strip | Solution treated | ≥ 795 (115 ksi) | ≥ 550 (80 ksi) | ≥ 15 | Also specified: Hardness ≤ 310 HBW / 32 HRC |
| Cold-rolled strip (EN 10088-2, ≤8 mm) | +AT (solution annealed) | 750 – 1000 | ≥ 550 | ≥ 20 | |
| Hot-rolled plate (EN 10088-2, ≤75 mm) | +AT (solution annealed) | 730 – 930 | ≥ 530 | ≥ 20 | Hot-rolled strip (≤13.5 mm): Rm 750–1000 MPa, otherwise as here. KV ≥ 100/60 J (long./transv., over 10 mm). |
| Tube and pipe | |||||
| Heat-exchanger and instrument tubing | Solution treated at 1880–2060 °F [1025–1125 °C], water quenched or otherwise rapidly cooled | ≥ 800 (116 ksi) | ≥ 550 (80 ksi) | ≥ 15 | |
| Seamless and welded pipe | 1880–2060 °F [1025–1125 °C], rapid cooling in water or by other means | ≥ 800 (116 ksi) | ≥ 550 (80 ksi) | ≥ 15 | Also specified: Hardness ≤ 300 HBW / 32 HRC H₂S service: NACE MR0175 / ISO 15156-3 sets the H₂S partial-pressure limit from the heat's actual FPREN: 20 kPa for 40–45, 10 kPa for 30–40 (up to 232 °C); solution-annealed, 35–65 % ferrite. |
| Electric-fusion-welded pipe with filler metal | Post-weld solution treatment 1880–2060 °F [1025–1125 °C], rapid cooling in air or water | ≥ 800 (116 ksi) | ≥ 550 (80 ksi) | ≥ 15 | Also specified: Hardness ≤ 310 HBW / 32 HRC Mechanical properties follow the plate used. |
| Seamless pressure tubes (EN 10216-5, wall ≤30 mm) | +AT (solution annealed) | 800 – 1000 | ≥ 550 | ≥ 20 | KV ≥ 150/90 J (long./transv.), at −40 °C ≥ 40 J transverse. |
| Welded pressure tubes (EN 10217-7, wall ≤30 mm) | +AT (solution annealed) | 800 – 1000 | ≥ 550 | ≥ 20 | KV ≥ 100/100 J (long./transv.), at −40 °C ≥ 40 J transverse. |
| Fittings and flanges | |||||
| Fittings | Solution treated | ≥ 800 (116 ksi) | ≥ 550 (80 ksi) | ≥ 15 | Also specified: Hardness ≤ 310 HBW |
Where this grade is recommended
Matched in 3 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Desalination & RO | Marine & Offshore | ≤ 45 °C | 3 / 12 | 92 |
| Seawater piping & HX | Marine & Offshore | 40 – 90 °C | 6 / 11 | 89 |
| Subsea lines, risers & manifolds | Oil & Gas | 60 – 150 °C | 4 / 7 | 85 |
Designations & equivalents
| W.Nr. (Germany) | 1.4410 |
| EN designation | X2CrNiMoN25-7-4 |
| Trade name(s) | 2507 / SAF 2507 / UR52N+ |
| ASTM / AISI | A182 / A240 / A276 / A484 / A789 / A790 / A815 / A928 |
| JIS (Japan) | SUS327L1 |
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
14 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 2507 Super Duplex · UNS S32750?
2507 Super Duplex · UNS S32750 — Duplex stainless steel. PREN ≥ 40 super duplex — SWRO high-pressure piping and subsea manifolds
What is the maximum service temperature of S32750?
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 S32750?
The specified minimum tensile strength is 795 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 S32750?
ASTM A182, ASTM A240, ASTM A276, 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 A479
Where is S32750 typically used?
Desalination & RO (Marine & Offshore); Seawater piping & HX (Marine & Offshore); Subsea lines, risers & manifolds (Oil & Gas)
In which forms is S32750 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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