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Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
High Strength Duplex Stainless Tubing
ASTM A789 / A790 | UNS S32205 / S32750 | Yield Strength ≥ 450 MPa Duplex Grade
ISO 9001 | PED | TS CertifiedRelated Products
Introduction
In applications where conventional austenitic stainless steel tubing reaches the boundaries of its mechanical capability, High Strength Duplex Stainless Tubing provides the engineering solution that bridges the gap between standard corrosion-resistant alloys and high-performance structural materials. Manufactured from premium duplex grades including UNS S32205, S32750, and S32760, this tubing category is defined by its exceptional yield strength — typically 450 MPa to 550 MPa depending on grade — which is approximately twice that achievable with 304L or 316L austenitic alternatives. This mechanical superiority stems directly from the balanced austenite-ferrite dual-phase microstructure that characterizes all duplex stainless steels, where the ferrite phase contributes to strength and stress corrosion cracking resistance while the austenite phase ensures adequate ductility, toughness, and fabricability. The result is a tubing material that enables engineers to design thinner-walled, lighter systems operating at higher working pressures than would be achievable with single-phase austenitic grades, delivering both structural performance and long-term corrosion resistance in a single material solution.
The mechanical advantages of high strength duplex stainless tubing are particularly compelling in structural and pressure-containing applications where weight minimization, fatigue life, and dimensional precision are simultaneously critical. In offshore platform structural tubing, the high yield strength of duplex alloys allows significant reductions in tube wall thickness, directly reducing submerged weight and the associated structural load on platform support systems. In high-pressure hydraulic and instrumentation tubing applications, the superior burst pressure capability of duplex grades compared to austenitic alternatives enables more compact system designs with reduced component counts and simplified installation. The inherent resistance of the dual-phase microstructure to fatigue crack propagation — attributable to the crack-arresting behavior at austenite-ferrite phase boundaries — further extends the operational life of tubing systems subject to cyclic pressure loading, vibration, or dynamic mechanical stress, making high strength duplex tubing the preferred material for demanding dynamic applications where long maintenance-free service intervals are a critical operational requirement.
From a corrosion engineering perspective, high strength duplex stainless tubing delivers a comprehensive protection profile that complements its mechanical performance. The elevated chromium content of 22–25%, combined with molybdenum additions of 3–4% and nitrogen enhancement, produces PREN values ranging from 34 to 42+, providing reliable protection against chloride-induced pitting and crevice corrosion in seawater, process cooling water, and industrial chemical environments. The ferrite-rich dual-phase structure provides inherent immunity to chloride stress corrosion cracking — the failure mechanism that most commonly compromises austenitic tubing in warm chloride-containing environments — eliminating the risk of catastrophic in-service failure that can result from the combination of residual fabrication stress and corrosive operating conditions. This dual mechanical-corrosion performance profile makes high strength duplex stainless tubing the material of choice across a wide range of demanding industries, from offshore oil and gas production and chemical processing to desalination infrastructure, structural engineering, and high-pressure fluid transport systems where uncompromising reliability is the defining specification requirement.
Our high strength duplex stainless tubing program covers a comprehensive range of dimensions, grades, and product forms to address the full diversity of structural and pressure-containing tubing requirements. Available in seamless and welded constructions, with outer diameters from 6.35mm to 610mm and wall thicknesses from 0.5mm to 30mm, all tubing is manufactured and tested in full compliance with ASTM A789, ASTM A790, EN 10216-5, and applicable structural and pressure vessel codes. Comprehensive material certifications including EN 10204 3.1 Mill Test Reports are provided as standard, covering full chemical and mechanical property traceability, non-destructive test records, and dimensional inspection data. Whether your application requires the cost-effective performance of lean duplex S32304, the proven reliability of standard duplex S32205, or the maximum strength and corrosion resistance of super duplex S32750, our technical team is equipped to provide alloy selection guidance, pressure-temperature rating support, and application engineering expertise to ensure your high strength duplex tubing solution delivers the performance, reliability, and service life your most demanding projects require.
Specifications
| Material Grade | S32205 / S32750 / S32760 Duplex |
| Standard | ASTM A789, A790, EN 10216-5 |
| Outer Diameter | 6.35mm - 610mm |
| Wall Thickness | 0.5mm - 30mm |
| Length | Up to 12000mm (Custom Available) |
| Finish | Pickled, Polished, or Bright Annealed |
Chemical Composition (S32205)
| Element | C | Mn | Si | Cr | Ni | Mo | N |
| Value (%) | ≤0.030 | ≤2.00 | ≤1.00 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 |
PREN ≥ 34Yield ≥ 450 MPaSCC Resistant
Mechanical Strength
Comprehensive Info
| MOQ | 500kg (Negotiable for stock) |
| Lead Time | 15 - 30 Days |
| Packaging | Plywood Crates / Bundles |
| Certifications | ISO 9001, PED, TS |
| Raw Materials | Premium Global Sources |
| Customization | OD/WT, Length, Surface, Marking |
Applications
Offshore Structural TubingHigh-strength structural members and bracing for offshore platforms and jackets
High-Pressure Hydraulic LinesCompact, high-pressure hydraulic and instrumentation tubing systems
Chemical Process PipingHigh-pressure chemical reactor feed lines and process piping systems
Desalination InfrastructureHigh-pressure reverse osmosis membrane housings and brine handling lines
Structural EngineeringLightweight, high-strength structural tubing for bridges and coastal infrastructure
Dynamic Fatigue ApplicationsRiser systems and umbilical tubes subject to cyclic mechanical loading
Advantages
2x Yield Strength
Minimum 450 MPa yield strength enables thinner walls and reduced weight versus austenitic grades at equivalent pressure ratings.
SCC Immunity
Dual-phase microstructure eliminates chloride stress corrosion cracking, the most common failure mode in austenitic tubing systems.
High Fatigue Resistance
Phase boundaries arrest fatigue crack propagation, extending service life in dynamic loading and vibration-prone applications.
Reduced Total Cost
Lower wall thickness, extended service life, and reduced maintenance frequency deliver superior total cost of ownership.
About Jiangsu Jend Tube Co.,Ltd.
As China High Strength Duplex Stainless Tubing Manufacturers and Wholesale High Strength Duplex 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.
Product Usage Tips
Welding Recommendations
Use TIG welding with ER2209 filler for S32205 or ER2594 for S32750. Maintain interpass temperature below 150°C and use nitrogen-argon backing gas to preserve the dual-phase microstructure and mechanical strength in the weld zone.
Cutting & Fabrication
Plasma arc or waterjet cutting recommended. Use carbide tooling with adequate cooling for machining. Segregate all tooling from carbon steel to prevent iron contamination that compromises corrosion performance in service.
Cleaning & Passivation
Passivate with nitric or citric acid after fabrication to restore the passive film. This is especially important for high-strength applications where any surface corrosion initiation can accelerate fatigue crack growth under cyclic loading.
Temperature Considerations
Recommended service range: -50°C to 300°C. For high-strength structural applications, ensure design accounts for the slightly higher notch sensitivity of duplex grades compared to austenitic grades at sub-zero temperatures.
Value-Added Processing Services
Beyond manufacturing, we offer precision processing to save your production time:
Precision Cutting
Fixed length with ±0.5mm tolerance for exact structural and pressure system requirements.
Beveling
End preparation for high-integrity welded joints in pressure-containing assemblies.
NDT Inspection
Ultrasonic, eddy current, and hydrostatic testing to project specifications.
Surface Polishing
Up to 600 Grit finish for corrosion-critical and high-purity applications.
Payment & Shipping
Payment Terms
- T/T (Telegraphic Transfer)
- L/C at Sight (Letter of Credit)
- Western Union
- Flexible terms for long-term partners
Shipping Options
- Sea Freight (FCL/LCL)
- Air Freight for urgent orders
- Express for small samples
- Seaworthy wooden cases or bundles with end caps
Certifications & Standards
Our high strength duplex stainless tubing complies with internationally recognized quality and structural standards:
ISO 9001:2015
PED Certification
TS Pressure Vessel
ASTM A789 / A790
EN 10216-5
EN 10204 3.1 MTR
Frequently Asked Questions
How much stronger is duplex tubing compared to 316L?
Duplex S32205 has a minimum yield strength of 450 MPa versus 170 MPa for 316L — approximately 2.6 times higher — allowing significantly thinner walls for the same pressure rating and enabling lighter, more cost-effective system designs.
Does high strength duplex tubing maintain toughness at low temperatures?
Yes, duplex stainless steel retains good impact toughness down to -50°C, making it suitable for outdoor installations and moderately cryogenic applications, though for temperatures below -50°C, austenitic or nickel alloy grades are generally preferred.
Is duplex tubing suitable for fatigue-critical applications?
Yes, the dual-phase microstructure provides superior fatigue crack resistance compared to austenitic grades. Phase boundaries act as crack arrestors under cyclic loading, making duplex tubing highly suitable for riser systems, umbilicals, and vibration-prone process lines.
Can high strength duplex tubing be bent or formed?
Yes, duplex tubing can be cold bent and formed, though it requires higher forming forces than austenitic grades due to its higher yield strength. Minimum bend radii and forming parameters should be confirmed with our technical team for your specific application.
Do you provide MTRs with all shipments?
Yes, every shipment includes EN 10204 3.1 Mill Test Reports with full chemical analysis, mechanical test results, heat treatment records, and non-destructive examination certificates for complete material traceability.
What grades are available in the high strength duplex range?
We supply lean duplex S32304 (PREN 24–26), standard duplex S32205 (PREN 34+), super duplex S32750 (PREN 42+), and S32760, covering a full range of strength and corrosion resistance levels for diverse application requirements.
What is the typical lead time?
Standard duplex S32205 dimensions are available within 15–25 days. Super duplex S32750 and custom specifications typically require 30–45 days depending on dimensional complexity and production scheduling.
Do you export internationally?
Yes, we supply high strength duplex stainless tubing to over 50 countries across the Middle East, Europe, Southeast Asia, and the Americas, with comprehensive export documentation and logistics support.
Ready to Order High Strength Duplex Stainless Tubing?
Contact our technical team for grade selection, custom specifications, and competitive pricing
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