Professional Stainless Steel Tubing SolutionsMarine tubing is selected for compact shipboard routing and continuous exposure to salt-laden air, seawater and changing operating conditions. TeCarve supplies stainless steel tube options for cooling-water circuits, ballast systems, hydraulic lines, exhaust assemblies and offshore equipment, with grade and dimensions matched to the specified duty.
Shipyard and offshore packages also require attention to fabrication access, joining method and project documentation. Tube form, wall thickness, surface condition and inspection requirements should therefore be confirmed against the vessel specification rather than treated as a generic industrial piping order.
Discover more stainless steel tube and pipe options that complement your selection. Our linked products help you find the right material, shape, and specification for every industrial need. Whether you’re seeking seamless precision, welded strength, or specialized forms — we’ve got you covered.
Grade and surface requirements can be chosen around seawater contact, salt spray and onboard cleaning conditions.
Tube dimensions and cut lengths can be coordinated with restricted machinery spaces and vessel layouts.
Options can be matched to cooling, ballast, hydraulic, exhaust and offshore equipment duties.
Dimensional consistency supports bending, joining and installation during module or vessel assembly.
Surface condition and tube configuration can be specified with inspection and replacement access in mind.
Material and inspection documents are confirmed against the shipyard or classification-society requirements named in the purchase specification.
For shipbuilding seawater piping, see our metallurgically bonded clad steel pipe, which pairs a carbon steel backing with a stainless or duplex corrosion layer.
Need grade and standard details for welded pipe or coil tube? Read our Stainless Steel Tube for Marine & Shipbuilding: Grades, Standards, and Selection Guide.
Tube Type: Seamless / Coiled Tubes
Grades: 316L, 317L, 904L
OD Range: 6mm – 38mm
Wall Thickness: 0.7mm – 2.0mm
Common Size in mm: 12.7×1.0, 19.05×1.5
Finish: Bright Annealed / Polished
Remarks: High chloride resistance required
Tube Type: Welded / Seamless Tubes
Grades: 316L, Duplex 2205
OD Range: 21.3mm – 76.2mm
Wall Thickness: 1.5mm – 4mm
Common Size in mm: 33.4×2.77, 48.3×3.05
Finish: Pickled / Satin
Remarks: Corrosion + high flow rate tolerance
Tube Type: Thick-Walled / Seamless Tubes
Grades: 321, 316Ti, 310S
OD Range: 25.4mm – 101.6mm
Wall Thickness: 2mm – 6mm
Common Size in mm: 60.3×3.0, 76.1×4.0
Finish: Annealed
Remarks: High temperature + vibration resistant
Tube Type: Special-Shaped / Coiled Tubes
Grades: 316L, Duplex 2507
OD Range: 6mm – 25mm
Wall Thickness: 1mm – 2.5mm
Common Size in mm: 12×1.5, 19×2
Finish: Electropolished / Custom
Remarks: Pressure tight, anti-corrosion
Tube Type: Seamless Tubes
Grades: 316L, 321
OD Range: 6mm – 50mm
Wall Thickness: 1mm – 3mm
Common Size in mm: 10×1.5, 38×2.5
Finish: Smooth / Pickled
Remarks: High fatigue and pressure resistance
Tube Type: Welded Tubes
Grades: 316L
OD Range: 25mm – 76mm
Wall Thickness: 1.5mm – 2.5mm
Common Size in mm: 42.4×2.0, 63.5×2.5
Finish: Satin Polished
Remarks: Fire-safe and long-service life
Molybdenum-bearing alloys engineered for seawater cooling, marine ballast systems, offshore platforms, and coastal salt-spray exposure.
NDT per standard or order via multi-channel eddy current; hydrostatic testing per standard or order on factory test benches rated up to 20–30 MPa.
Standard EN 10204 3.1 MTC included. Pre-shipment inspections via BV and SGS supported on request; packed in seaworthy wooden cases.
Supplied from our partner factories in Foshan & Wenzhou. Customer names withheld.
ASTM A790 UNS S31803 (duplex 2205), 4" SCH 40S × 6,000 mm
EN 10253-4 1.4404 (316L) seamless 90° LR elbows, 6" SCH 10S
Direct excerpts from international buyers receiving our precision stainless tube shipments.
“I've received the goods and everything is fine.”
“The goods already send to customers. I am waiting for the next order from them.”
“…there is no need of inspection this time… I trust in your product.”
Selecting piping alloys for shipboard and offshore duties requires balancing localized pitting resistance, crevice corrosion limits in stagnant seawater, and mechanical yield strength. Review our metallurgical performance matrix comparing 316L, Duplex 2205, and Super Austenitic 904L under ASTM B117 salt spray, ASTM G48 ferric chloride, and actual seawater operating conditions.
The Pitting Resistance Equivalent Number (PREN) is the universally accepted metallurgical index (referenced in ISO 15156 / NACE MR0175 and NORSOK standards) quantifying a stainless alloy's resistance to localized breakdown of the passive chromium oxide film in chloride-rich marine electrolytes. A higher PREN indicates superior resistance to pitting initiation, higher Critical Pitting Temperature (CPT), and greater resilience against crevice attack beneath marine fouling, biological slimes, or flange gaskets.
Suited for marine atmospheric exposure, non-submerged superstructure lines, deck fittings, and fresh cooling water circuits. Susceptible to crevice attack in warm or stagnant seawater (> 20°C).
Optimal for seawater ballast systems, bilge piping, and marine fire mains. With double the yield strength of 316L (yield ≥ 450 MPa), 2205 allows significant wall thickness reduction and topside weight savings.
Engineered for marine exhaust gas scrubbers (EGCS) and acidic washwater circuits. High nickel (25%) and 1.5% copper provide unmatched resistance to sulfuric acid and hot chloride condensates.
| Material & Standard | Nominal Composition | PREN Range | ASTM B117 Salt Fog Behavior | Seawater & Chloride Service Limits | Recommended Shipboard Applications |
|---|---|---|---|---|---|
| 316L Stainless Steel UNS S31603 / EN 1.4404 ASTM A312 / A269 | 17% Cr – 12% Ni 2.5% Mo – 0.04% N | 23 – 25 | Passes standard neutral salt spray test without red rust after proper chemical passivation (ASTM A967). Excellent resistance to marine mist and coastal humidity. | Reliable in aerated, flowing natural seawater up to ~1.5 m/s. Susceptible to crevice corrosion in stagnant seawater above 20°C (68°F) and chloride stress cracking above 60°C. | Deck railings & architectural stanchions, freshwater cooling loops, hydraulic impulse lines, shipboard sanitary plumbing, dry exhaust ducts. |
| Duplex 2205 UNS S32205 / EN 1.4462 ASTM A789 / A790 | 22% Cr – 5% Ni 3.2% Mo – 0.18% N | 34 – 38 (PREN ≥ 35) | Zero pitting or staining in severe salt spray testing. Critical Pitting Temperature (CPT per ASTM G48 Method A) > 35°C (compared to ~15°C for 316L). | Immune to chloride stress corrosion cracking up to 150°C. Superior erosion-corrosion resistance at high seawater flow velocities (up to 20 m/s). | Seawater ballast & bilge piping, marine firewater loops, cargo piping on chemical tankers, offshore seawater cooling risers, hull overboard discharges. |
| Super Austenitic 904L UNS N08904 / EN 1.4539 ASTM A312 / A269 | 20% Cr – 25% Ni 4.5% Mo – 1.5% Cu | 34 – 38 (+1.5% Cu) | Outstanding resistance in continuous marine salt fog and splash zones. High nickel (25%) inhibits localized chloride depassivation under acidic conditions. | Excellent crevice corrosion resistance in chlorinated seawater. Specifically resistant to hot sulfuric/sulfurous acid condensates in marine exhaust systems. | Marine exhaust gas cleaning systems (EGCS / Scrubbers), washwater piping, marine plate/shell heat exchangers, reverse osmosis desalination systems. |
