EN 1.4410 / 2507 / UNS S32750 Duplex Stainless Steel Pipe for Marine Engineering SS Pipes
EN 1.4410 / 2507 / UNS S32750 Duplex Stainless Steel Pipe for Marine Engineering SS Pipes
Products Specification
| Products Name | Duplex 2507 Stainless Steel Seamless Pipe |
Grade: |
304 304L 309S 310S 314 315 316L 316Ti 317L 321 329 347H 410 2205 2507 S32760 904L 254SMO and equal grade in GB JIS EN DIN Standard |
| Standards: | ASTM A213M-94b ASTM A249M-94a ASTM A269-94a ASTM A312M-94b,ect. ASTM A790 |
| DIN 17456-85 DIN 17458-85 DIN 17459-92.ect | |
| JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect. | |
| GB13296-1991 GB14975-2002 GB14976-2002,ect. | |
| Size: | ND5 - DN400 |
| Length: | 6m length or cutting any length as request |
| Applications: | fluid and gas transport, structure , boiler, heat exchanger, super heater |
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:
| Element | C | Cr | Ni | Mo | N | Mn | Si | S | P |
|---|---|---|---|---|---|---|---|---|---|
| Min | ≤0.03 | 24.0 | 6.0 | 3.0 | 0.24 | ≤1.2 | ≤0.80 | ≤0.02 | ≤0.035 |
| Max | 26.0 | 8.0 | 5.0 | 0.32 |
2. Mechanical Properties
Superior strength and ductility enable thinner pipe walls, reducing weight and cost:
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (σb) | ≥730–795 | MPa |
| Yield Strength (σ0.2) | ≥550 | MPa |
| Elongation (δ) | ≥15–25 | % |
| Hardness | ≤290–310 | HV |
| Impact Energy (RT) | ≥74 | ft-lb |
| Thermal Expansion (20–100°C) | 13 × 10⁻⁶ | K⁻¹ |
3. Key Characteristics
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Corrosion Resistance:
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Immune to chloride-induced stress corrosion cracking (SCC), even in 2000 ppm Cl⁻ environments.
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Superior to 904L in sulfuric acid with chlorides and to 316L in dilute hydrochloric acid.
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Strength & Durability:
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Yield strength ≥550 MPa (twice that of standard austenitic steels), suitable for high-pressure pipelines.
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Low thermal expansion and high thermal conductivity reduce thermal stress.
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Weldability:
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Compatible with ER2594 filler metal and E2594 electrodes for crack-free joints.
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Temperature Limits:
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Avoid prolonged exposure >570°F (300°C) to prevent embrittlement.
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4. Standards & Equivalent Grades
| Region | Standard | Grade |
|---|---|---|
| Europe | EN 1.4410 | X2CrNiMoN 25-7-4 |
| USA | UNS S32750 | ASTM A790/A789 |
| France | AFNOR Z3 CN 25.06 Az | ASME SA-240 |
| Japan | JIS G3463 | F53 |
5. Applications in Marine Engineering
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Offshore Structures: Subsea pipelines, platform water injection systems, firefighting equipment.
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Desalination Plants: High-pressure RO tubes, brine heaters.
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Shipbuilding: Chemical tanker piping, ballast water systems.
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Heat Exchangers: Seawater cooling systems due to biofouling resistance.
6. Export Packaging & Transportation
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Packaging:
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Ends capped with plastic protectors.
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Bundled in woven bags or wooden crates (weather-resistant).
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Transport:
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Seaworthy containers with waterproof wrapping.
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Shock-absorbent stacking to prevent surface damage during transit.
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Get in Touch
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