Seamless Super Duplex Steel S32550 |UNS S32550|1.4507 Pipe
Featuring a high Pitting Resistance Equivalent Number (PREN ≥ 40), our S32550 super duplex pipes provide exceptional durability in aggressive media, including sulfuric acid, phosphoric acid, and chloride-rich seawater. The addition of copper enhances its resistance to non-oxidizing acids, making it a superior choice for chemical processing, desalination, and offshore systems. Through advanced cold-drawing and precise solution annealing, We ensures every pipe maintains optimal phase balance and maximum mechanical strength for mission-critical industrial applications.
PREN = %Cr + 3.3X%Mo + 16 X%N ≥ 40
Seamless Super Duplex Steel UNS S32550 Pipe (S32550 / UNS S32550 / W.Nr. 1.4507) is a super duplex grade with high chromium and molybdenum for seawater and acid service. 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 A790 / ASME SA790 — Seamless & Welded
- ASTM A999 / A999M — General Requirements
- EN 10216-5 — Seamless Pressure Tubing
- Finishing: solution annealed, pickled & polished; bright annealed available on request
Size Range
| Outside Diameter (OD) | Wall Thickness | Length |
|---|---|---|
| 6 mm – 1016 mm (1/4"– 40") | 0.5 mm – 65 mm | 6 m / 12 m, or as required |
Chemical Composition
S32550 (UNS S32550) — Composition %
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| S32550 | ≤ 0.04 | ≤ 1.50 | ≤ 0.040 | ≤ 0.030 | ≤ 1.00 | 24.0 – 27.0 | 4.5 – 6.5 | 2.9 – 3.9 | 0.10 – 0.25 | 1.50 – 2.50 |
Mechanical Properties
| Property | Value |
|---|---|
| Delivery Condition | Solution annealed, pickled & polished |
| Tensile Strength | ≥ 760 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 | 15.0 W/m·K |
| Specific Heat Capacity | 480 J/kg·K |
| Elastic Modulus | 200 GPa |
| Magnetic Properties | Magnetic |
| PREN (Pitting Resistance Equivalent) | 38.0-40.0 |
Industry Applications
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