EN 1.4410 / 2507 / UNS S32750 Duplex Stainless Steel Pipe for Marine Engineering SS Pipes

Introduction
2507 duplex stainless steel (designated as EN 1.4410, UNS S32750, or F53) is a super duplex alloy combining ferritic and austenitic structures. It delivers exceptional mechanical strength and corrosion resistance, especially in aggressive marine environments. With high chromium (24–26%), molybdenum (3–5%), and nitrogen (0.24–0.32%) content, it outperforms standard austenitic steels (e.g., 316L) and common duplex grades (e.g., 2205) in chloride-rich settings like seawater systems, offshore platforms, and desalination plants.

1. Chemical Composition (wt%)

The optimized balance of key elements enhances pitting and stress corrosion resistance:

2. Mechanical Properties

Superior strength and ductility enable thinner pipe walls, reducing weight and cost:

3. Key Characteristics

• Corrosion Resistance:

  • Immune to chloride-induced stress corrosion cracking (SCC), even in 2000 ppm Cl⁻ environments.

  • Superior to 904L in sulfuric acid with chlorides and to 316L in dilute hydrochloric acid.

• Strength & Durability:

  • Yield strength ≥550 MPa (twice that of standard austenitic steels), suitable for high-pressure pipelines.

  • Low thermal expansion and high thermal conductivity reduce thermal stress.

• Weldability:

  • Compatible with ER2594 filler metal and E2594 electrodes for crack-free joints.

• Temperature Limits:

  • Avoid prolonged exposure >570°F (300°C) to prevent embrittlement.

4. Standards & Equivalent Grades

5. Applications in Marine Engineering

• Offshore Structures: Subsea pipelines, platform water injection systems, firefighting equipment.

• Desalination Plants: High-pressure RO tubes, brine heaters.

• Shipbuilding: Chemical tanker piping, ballast water systems.

• Heat Exchangers: Seawater cooling systems due to biofouling resistance.

6. Export Packaging & Transportation

• Packaging:

  • Ends capped with plastic protectors.

  • Bundled in woven bags or wooden crates (weather-resistant).

• Transport:

  • Seaworthy containers with waterproof wrapping.

  • Shock-absorbent stacking to prevent surface damage during transit.