Seamless Super Duplex Steel S32750 |UNS S32750|1.4410 Tube
Designed for the most aggressive chloride environments, our S32750 tubes are optimized to achieve a high Pitting Resistance Equivalent Number (PREN ≥ 41). This superior threshold ensures exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in hot seawater and offshore applications. With a yield strength significantly higher than conventional austenitic stainless steels, these tubes enable lighter wall designs and enhanced pressure ratings for mission-critical reliability. Through advanced cold-drawing and specialized solution annealing, Tengqi ensures every tube maintains optimal phase balance and a high-integrity surface finish.
PREN = %Cr + 3.3X%Mo + 16 X%N ≥41
Seamless Super Duplex UNS S32750 Tube (S32750 / UNS S32750 / W.Nr. 1.4410) is the 2507 super duplex grade with a PREN above 40 for the most demanding offshore environments. Manufactured by Tengqi in Fujian, China, every heat is fully traceable, hydro-tested and available with third-party inspection (SGS / BV / TUV) on request.
Product Specifications
- ASTM A789 / ASME SA789 — Seamless & Welded
- ASTM A790 / ASME SA790 — Seamless Pipe
- ASTM A1016 / A1016M — General Requirements
- Finishing: solution annealed, pickled & polished; bright annealed available on request
Size Range
| Outside Diameter (OD) | Wall Thickness | Length |
|---|---|---|
| 6.35 mm – 257 mm (1/4"– 10.1") | 0.5 mm – 12.7 mm | ≤ 22 m |
Chemical Composition
S32750 (UNS S32750) — Composition %
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| S32750 | ≤ 0.030 | ≤ 1.20 | ≤ 0.035 | ≤ 0.020 | ≤ 0.80 | 24.0 – 26.0 | 6.0 – 8.0 | 3.0 – 5.0 | 0.24 – 0.32 | ≤ 0.50 |
Mechanical Properties
| Property | Value |
|---|---|
| Delivery Condition | Solution annealed, pickled & polished |
| Tensile Strength | ≥ 800 MPa |
| Yield Strength (0.2% offset) | ≥ 550 MPa |
| Elongation in 2 in. / 50 mm | ≥ 15% |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm3 |
| Thermal Conductivity | 17.0 W/m·K |
| Specific Heat Capacity | 480 J/kg·K |
| Elastic Modulus | 200 GPa |
| Magnetic Properties | Magnetic |
| PREN (Pitting Resistance Equivalent) | ≥ 40.0 |
Industry Applications
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