B06 · Seawater Desalination
Selection and 4 Part Lists of Stainless Steel for Desalination Applications
We have organized four parts in stainless steel used in desalination: commonly used 2507 / 2205 / 316L, with thickness ranging from 2-15 mm.
List of parts and materials for four sections
| Section / Part | Recommended grade | Specification / Thickness | Surface | Main Failure Modes | Reference Standards |
|---|---|---|---|---|---|
| RO High-Pressure Pump/Energy Recovery Device | 2507（S32750/1.4410） | Casting/Forging/Tube | Surface/Passivation | High Pressure Sea Water 60–80 bar + Cl⁻ + Cavitation Corrosion | ASTM A240；EN 10217-7；NORSOK M-650 |
| Sea Water Feed Pipe/Fittings | 2507/2205 | Pipe Wall 2–15 mm | Passivation | High Chloride Sea Water + High Speed Scrubbing + Crevice Corrosion | ASTM A240/A789；EN 10217-7 |
| RO Membrane Shell/Filter | 316L/2205/2507 | 2–10mm | Passivation / 2B | High Pressure Sea Water Corrosion + Membrane Contamination | ASTM A240；GB/T 3280 |
| Dechlorinated Water Delivery Pipe | 304L/316L | 2–8mm | 2B / Passivation | Low Chloride Product Water + External Atmosphere | GB/T 3280 |
Select materialsShow usage conditionsMaterial selection tips
Variations based on media, temperature, and welding methods
- The most common grades in this industry are 2507 (3), 2205 (2), and 316L (2) —— numbers in parentheses indicate the number of affected areas, useful for quoting and material ordering.
- Common sources of corrosion are chloride ions and salts (pitting, crevice corrosion) (4/4 hits).
- Thickness range: 2–15 mm (thin plates used for forming parts, consider springback and deep drawing cracking; thick plates used for welded structures, consider heat input and sensitization).
Common issues
Which stainless steel is used most for seawater desalination?
By total number of occurrences, the top three are 2507 (3), 2205 (2), and 316L (2). Specific parts may require different grades depending on the medium and temperature.
What type of part is the most problematic?
Based on failure descriptions, typical issues are "RO high-pressure pump/energy recovery device": High pressure seawater 60–80 bar + Cl⁻ + cavitation corrosion. Recommended grade 2507 (S32750/1.4410), available in cast, forged, and tube forms. For this type of application, it's recommended to specify medium concentration, temperature, and cleaning methods during the design phase.
What thickness should I choose?
Thickness range in the list is 2–15 mm. For thin plates, consider forming and surface quality; for thick plates, welding and structural strength. Different manufacturers may have different values for the same part; review your drawing or operating conditions.
Related materials and adjacent industries
Applications4
Thickness2–15mm
Grades250