Corrosion Resistant Round Stainless Steel Pipe For Marine Chemical Applications
The High Corrosion Resistance Round Pipe is engineered from premium stainless steel grades with optimized chromium, nickel, and molybdenum content to withstand aggressive environments where standard steel pipes would rapidly degrade. This pipe provides exceptional protection against rust, pitting, crevice corrosion, and stress corrosion cracking caused by chlorides, acids, alkalis, and marine atmospheres. Available in seamless or welded construction, it delivers long-term reliability with minimal maintenance, making it the preferred choice for chemical processing, marine, offshore, and water treatment applications.
| Parameter | Details |
|---|---|
| Standards | ASTM A312, A269, A213; EN 10216-5; ASME SA312; JIS G3459 |
| Available Grades | 316, 316L, 317L, 904L, 254SMO, Duplex 2205, Super Duplex 2507 |
| Outer Diameter | 6 mm – 610 mm (1/8″ – 24″ NPS) |
| Wall Thickness | 0.5 mm – 30 mm (Schedule 5S, 10S, 40S, 80S; or custom) |
| Length | 3m, 6m, or custom lengths upon request |
| Manufacturing Process | Seamless (cold drawn / hot rolled) or Welded (TIG / ERW) |
| Heat Treatment | Annealed after manufacturing |
| Surface Finish | Pickled, passivated, or polished |
| End Finish | Plain ends, beveled ends, or threaded |
| Grade | Cr | Ni | Mo | N | Cu | 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 | – | 1.0-2.0 | 34-38 |
| 254SMO | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | 0.18-0.22 | 0.5-1.0 | 42-45 |
| 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 = better corrosion resistance.
| Grade | Tensile Strength (MPa) min | Yield Strength (MPa) min | Elongation (%) min | Hardness (HB) max |
|---|---|---|---|---|
| 316L | 485 | 170 | 40 | 217 |
| 317L | 515 | 205 | 40 | 217 |
| 904L | 490 | 215 | 35 | 220 |
| 254SMO | 650 | 300 | 35 | 250 |
| Duplex 2205 | 620 | 450 | 25 | 290 |
| Super Duplex 2507 | 730 | 550 | 20 | 310 |
Tested in accordance with ASTM E8 / E8M.
| Environment | 304 | 316L | 904L | Duplex 2205 | 254SMO |
|---|---|---|---|---|---|
| Marine / Seawater | Poor | Good | Excellent | Excellent | Excellent |
| Chloride (high concentration) | Poor | Moderate | Very Good | Good | Excellent |
| Sulfuric Acid (dilute) | Poor | Good | Excellent | Very Good | Excellent |
| Sulfuric Acid (concentrated) | Poor | Poor | Good | Moderate | Good |
| Phosphoric Acid | Fair | Good | Excellent | Very Good | Excellent |
| Acetic Acid | Good | Excellent | Excellent | Excellent | Excellent |
| Caustic / Alkali | Good | Excellent | Excellent | Excellent | Excellent |
| Stress Corrosion Cracking | Low | Low | Very High | High | Very High |
Superior Pitting Resistance – High PREN values prevent localized corrosion
Excellent Crevice Corrosion Protection – Critical for flanges, gaskets, and threaded connections
Chloride Resistance – Withstands seawater, brackish water, and de-icing salts
Acid Resistance – Suitable for sulfuric, phosphoric, and organic acids
Long Service Life – Reduces replacement frequency and downtime
Low Maintenance – No painting or coating required
Wide Temperature Range – Performs from cryogenic to elevated temperatures
100% Recyclable – Environmentally sustainable material
Seawater cooling lines
Offshore platform piping
Shipbuilding (ballast, fuel, hydraulic lines)
Desalination plant brine lines
Subsea umbilicals and flow lines
Heat exchangers and condensers
Reactor feed and discharge lines
Acid transfer piping (sulfuric, phosphoric)
Solvent and intermediate transfer
Sour gas service (H₂S resistant)
Downhole tubing and casing
Flow lines and gathering lines
Firewater systems
Reverse osmosis feed lines
High-purity water distribution
Wastewater and effluent lines
Potable water systems
Bleaching plant piping
Digester and recovery lines
Sanitary process lines
CIP (clean-in-place) systems
| Application Severity | Recommended Grade | PREN Range | Typical Industries |
|---|---|---|---|
| Mild (fresh water, low chlorides) | 304L | 18-20 | Plumbing, food, general industrial |
| Moderate (brackish water, dilute acids) | 316L | 24-26 | Marine (low risk), chemical (mild) |
| High (seawater, sulfuric acid) | 904L / Duplex 2205 | 34-38 | Desalination, offshore, chemical |
| Severe (hot seawater, high chlorides, reducing acids) | 254SMO / Super Duplex 2507 | 42-45 | Subsea, aggressive chemical, FGD systems |
For inquiries, technical datasheets, or custom sizes, please contact our sales team.
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