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Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
S2205 Marine Engineering Stainless Tubing
2205 Duplex | Seawater Grade | Classification Society Compatible
DNV/ABS/LR Compatible | PREN ≥35 | NACE AvailableRelated Products
Introduction
S2205 Marine Engineering Stainless Tubing applies the same 2205 duplex chemistry used across duplex product lines to the specific demands of marine and offshore environments, where the combination of chloride-rich seawater, biofouling, and cyclic mechanical loading from wave action makes material selection especially consequential. The high pitting resistance equivalent number contributed by 22% chromium, 3% molybdenum, and controlled nitrogen gives this tubing strong resistance to the localized pitting and crevice corrosion that seawater otherwise concentrates around flanges, gaskets, and stagnant-flow zones — failure points that drive a disproportionate share of marine piping maintenance costs.
In marine engineering applications specifically, the duplex grade's roughly 2x yield strength advantage over standard austenitic tube translates directly into lighter installed systems: ballast water piping, seawater cooling loops, and fire main systems can be built with thinner wall sections that still meet classification society pressure and structural requirements, reducing both material cost and the deadweight penalty that heavier piping imposes on vessel and platform design. This tubing is also compatible with common cathodic protection schemes used on offshore structures, and its resistance to chloride stress corrosion cracking specifically addresses a failure mode that has historically limited austenitic stainless in continuous seawater immersion.
Typical installations include seawater cooling and ballast systems on commercial vessels, offshore platform firewater and process piping, desalination intake and outfall lines, and shipyard piping subject to alternating wet-dry splash-zone exposure where crevice corrosion risk is highest. Fabricators should follow classification society welding procedure qualification requirements (DNV, ABS, Lloyd's Register, or equivalent) in addition to standard ferrite-balance control, since marine projects typically require third-party witness testing and material traceability beyond standard mill certification.
Specifications
| Material Grade | 2205 Duplex (UNS S31803/S32205) |
| Standard | ASTM A789/A790, Class Society WPS |
| Outer Diameter | 12.7mm - 219mm |
| Wall Thickness | 1.2mm - 16mm |
| Length | Up to 12000mm |
| Finish | Solution Annealed, Pickled |
Chemical Composition
| C | Cr | Ni | Mo | N |
| ≤.03 | 21-23 | 4.5-6.5 | 2.5-3.5 | .08-.20 |
Marine Grade Class Compatible
Mechanical Strength
Comprehensive Info
| MOQ | 500kg |
| Lead Time | 30 - 45 Days |
| Testing | Ferrite Content & Class Witness Test |
| Cathodic Protection | Compatible |
Key Applications
Vessel Cooling Systems Seawater cooling and ballast piping
Offshore Platforms Firewater and process piping systems
Desalination Seawater intake and outfall lines
Advantages
Lighter Systems
Higher yield strength reduces wall thickness and deadweight.
Splash-Zone Rated
Resists crevice corrosion at wet-dry cyclic exposure zones.
Cathodic Protection Compatible
Suits common offshore CP schemes without adverse interaction.
Class Society Ready
Fabrication supports DNV, ABS, and Lloyd's Register WPS.
About Jiangsu Jend Tube Co.,Ltd.
As China S2205 Marine Engineering Stainless Tubing Manufacturers and Wholesale S2205 Marine Engineering Stainless Tubing Factory, Established in 2011 and is a manufacturing enterprise with a complete manufacturing cycle from raw material selection to finished product delivery. The company currently has more than 100 employees, covers an area of 30015 square meters, and has a registered capital of 48 million yuan, annual production capacity of 3800 tons.
The company has passed ISO9001:2015 quality certification, domestic pressure vessel TS certification, and foreign pressure vessel PED certification. With rich experience and mature technology, we have been expanding our market internationally. At present, our products are exported to more than 50 countries and regions including Europe, America, Southeast Asia, and the Middle East.
The company adheres to different production norms and standards such as the American standard (ASTM), the European standard (EN), the German standard (DIN), the Japanese standard (JIS), the Russian standard (GOST), and the Chinese standard (GB).
Our company specializes in and customizes various specifications of Martensite TP410 (0Cr13, 1Cr13), Ferrite TP405 (1Cr13Al), TP430 (1Cr17), TP444 (0Cr18Mo2), TP439, TP409 (0Cr11Ti), It is also proficient in manufacturing Austenitic seamless stainless steel pipes of series such as TP304(L/H), TP316(L/H/Ti), TP310S, TP317, TP321(H) and TP347(H). Duplex such as S31803, S2205, S32750, S32304, and Nickel-based alloys Monel400, Monel600, Monel800, GH3030, 904L, Inconel 625, etc.
The company mainly produces seamless steel pipes with the following specifications: outer diameter: 3.18mm to 406.4mm, wall thickness: 0.3mm to 20mm, and the longest length is 25000mm. Additionally, it can customize seamless steel pipes with special materials and specifications according to customer requirements. The company attaches great importance to scientific innovation. The staff of the company vigorously develop technological research and development.
Jiangsu Jend Tube Co.,Ltd. will continuously accumulate professional knowledge and capabilities, striving to become a leader in the domestic market and even the world market. Strive to be the most reassuring pipe manufacturing enterprise for customers.
Precision Manufacturing and Process Optimization
We rely on precision equipment and optimized production technologies to achieve outstanding mechanical performance and consistent product quality.
Cold Rolling and Cold Drawing
Solution Heat Treatment
Natural gas solution treatment furnaces and BA solution treatment furnaces optimize the material's grain structure, enhancing corrosion resistance.
Precision Straightening and Polishing
10 straightening machines and 8 finishing polishing machines guarantee product surface smoothness and dimensional accuracy.
Automated Inspection and Quality Assurance
Real-time monitoring systems ensure the stable quality of every batch of products.
Usage Tips
Crevice Design
Minimize gasket and flange crevice geometry in continuous seawater immersion zones, since duplex resistance is strong but not unlimited under stagnant chloride conditions.
Witness Testing
Confirm classification society witness testing requirements early — marine projects often require third-party inspection beyond standard mill certification.
Services
Class WPS Support
Welding procedures aligned to DNV/ABS/LR requirements.
Ferrite & Witness Testing
Third-party witnessed inspection on request.
Bevel & End Prep
Weld-ready ends for shipyard and platform tie-ins.
Logistics
30% T/T Deposit / L/C at sight. Marine-grade VCI wrapping with sealed end caps, packed for extended sea-freight exposure to project or shipyard sites.
Standards
ASTM A789/A790
DNV/ABS/LR WPS Compatible
NACE MR0175 (on request)
ISO 9001
Frequently Asked Questions
How is this different from the standard S31803 duplex tube in your range?
The underlying alloy is the same 2205 duplex chemistry; this listing is configured and documented specifically for marine and offshore engineering use, including classification society compatibility and seawater-focused guidance.
Is this tubing suitable for continuous seawater immersion?
Yes, its pitting resistance equivalent and chloride SCC resistance make it well suited to continuous seawater cooling and ballast systems.
Does it work with cathodic protection systems?
Yes, 2205 duplex tubing is commonly used alongside standard offshore cathodic protection schemes without adverse interaction.
What classification societies can this material support?
Fabrication and testing can be arranged to support DNV, ABS, and Lloyd's Register welding procedure and material requirements, among others.
Why choose duplex over 316L for marine piping?
Duplex offers roughly double the yield strength and stronger chloride SCC resistance, allowing thinner, lighter piping systems for equivalent service life in seawater.
Is third-party witness testing available?
Yes, witnessed ferrite content, mechanical, and pressure testing can be arranged for projects requiring class society or owner inspection.
Need S2205 Tubing for a Marine or Offshore Project?
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