Corrosion Resistant Stainless Steel Tube For Marine Environments Duplex 2205 2507
The Corrosion-Resistant Tube for Marine Environments is specifically engineered to withstand the highly aggressive conditions found in seawater, brackish water, and coastal atmospheric applications. Manufactured from molybdenum-bearing austenitic stainless steel or duplex grades, this tube offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking caused by chlorides. Its seamless construction eliminates weld-related weak points, ensuring long-term reliability in offshore and marine applications.
| Parameter | Details |
|---|---|
| Standards | ASTM A312, A269, A789; EN 10216-5; ASME SA312 |
| Available Grades | 316L, 317L, 904L, Duplex 2205, Super Duplex 2507, Alloy 625 |
| Outer Diameter | 6 mm – 610 mm |
| Wall Thickness | 0.5 mm – 25 mm |
| Length | Fixed lengths 3m / 6m, or custom lengths upon request |
| Manufacturing Process | Seamless – Cold drawn / Hot rolled |
| Surface Finish | Annealed, pickled, passivated, polished |
| Grade | Cr | Ni | Mo | N | PREN* |
|---|---|---|---|---|---|
| 316L | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | – | 24-26 |
| 317L | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | – | 29-33 |
| 904L | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | – | 34-38 |
| Duplex 2205 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | 35-38 |
| Super Duplex 2507 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | 42-45 |
PREN = Pitting Resistance Equivalent Number (Cr% + 3.3*Mo% + 16*N%). Higher PREN indicates better chloride resistance.
| Grade | Condition | Tensile Strength (MPa) min | Yield Strength (MPa) min | Elongation (%) min | Hardness (HB) max |
|---|---|---|---|---|---|
| 316L | Annealed | 485 | 170 | 40 | 217 |
| 317L | Annealed | 515 | 205 | 40 | 217 |
| 904L | Annealed | 490 | 215 | 35 | 220 |
| Duplex 2205 | Annealed | 620 | 450 | 25 | 290 |
| Super Duplex 2507 | Annealed | 730 | 550 | 20 | 310 |
Tested in accordance with ASTM E8 / E8M.
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Excellent Chloride Corrosion Resistance – Withstands seawater, brine, and salt spray
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High Pitting Resistance Equivalent Number (PREN) – Critical for long-term immersion service
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Stress Corrosion Cracking Resistance – Performs well in high-temperature seawater
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Good Biofouling Resistance – Smooth surface reduces marine organism attachment
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Proven Offshore Performance – Widely used in oil & gas, desalination, and shipbuilding
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Offshore Platforms – Seawater cooling lines, firewater systems, hydraulic lines
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Shipbuilding – Ballast water systems, fuel lines, deck drainage
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Desalination Plants – High-pressure brine piping, reverse osmosis systems
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Subsea Equipment – Umbilicals, flow lines, hydraulic control lines
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Coastal Infrastructure – Bridge drainage, seawater intake structures
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Marine Exhaust Systems – Wet exhaust and scrubber systems
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Aquaculture – Seawater supply and recirculating systems
For inquiries, technical datasheets, or custom sizes, please contact our sales team.
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