Chloride Corrosion Failure
304/316 stainless steel is vulnerable to pitting and crevice corrosion in seawater and chloride-rich environments.
Why Standard Stainless Steel Fails in Harsh Environments
Stress Corrosion Cracking (SCC)
High-temperature and high-pressure systems often lead to sudden cracking failure in austenitic stainless steels.
High Lifecycle Cost
Frequent maintenance and replacement increase total operational cost significantly.
Our Duplex Stainless Steel Solution
Duplex stainless steel combines austenitic and ferritic microstructures, delivering a superior balance of strength,
corrosion resistance, and lifecycle efficiency for demanding industrial environments.
High Strength & Structural Efficiency
~2× higher yield strength than 304/316, enabling lighter design and reduced material usage.
Excellent Chloride Corrosion Resistance
Outstanding resistance to pitting and crevice corrosion in seawater and chloride-rich environments.
Stress Corrosion Cracking Resistance
Reliable long-term stability in high-pressure and high-temperature systems.
Cost-Effective Lifecycle Performance
Higher initial cost is offset by longer service life, reduced maintenance, and lower total lifecycle cost.
Types of Duplex Stainless Steel Grades
We offer duplex, super duplex, and high-alloy stainless steels in compliance with ASTM, EN, and ASME standards.
|
Grade |
Type |
Key Characteristics |
Typical Applications |
|
S32950 |
Lean Duplex |
Cost-effective upgrade over 304/316 |
Structural parts, general equipment |
|
S31803 |
Duplex (2205) |
Balanced strength & corrosion resistance |
Oil & gas, desalination, chemical |
|
S32205 |
Duplex (2205) |
Improved corrosion resistance |
Pressure vessels, offshore pipelines |
|
S32750 |
Super Duplex (2507) |
Extremely high strength & seawater resistance |
Offshore platforms, subsea systems |
|
S32760 |
Super Duplex (F55) |
Enhanced performance in extreme media |
Chemical plants, marine engineering |
|
S31254 |
Super Austenitic (254SMO) |
Very high pitting resistance |
Seawater systems, desalination |
|
S32654 |
Super Austenitic |
Extreme corrosion environments |
Advanced chemical processing |
|
N08904 |
Austenitic (904L) |
Acid & chloride resistant stainless |
Pharmaceutical, acid industry |
Available Forms of Duplex Stainless Steel
Plate & Sheet
Duplex stainless steel plates and sheets are widely used for structural fabrication, pressure equipment, and industrial construction.
Pipe & Tube
Duplex pipes and tubes are available in both seamless and welded forms, suitable for high-pressure and corrosive fluid systems.
Round Bar & Rods
Duplex Rods are used to process precision components and mechanical parts that require high strength and corrosion resistance.
Duplex Coil
Duplex Coil is supplied in the form of hot-rolled and cold-rolled coils for further processing and fabrication.
Duplex Forging
We can customize duplex stainless steel forgings designed specifically for high-strength and high-pressure applications.
Duplex Castings
Duplex stainless steel castings designed for complex geometries and industrial machinery applications.
Need Custom Duplex Stainless Steel Material?
Contact our engineering team for technical support, material selection, and fast quotation.
Explore Our Ranges of Duplex Stainless Steel
We supply full-range duplex stainless steel materials for global industrial procurement and engineering use.
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![N08904]()
N08904N08904 (commonly referred to as 904L or UNS N08904) is a low-carbon, highly alloyed super austenitic stainless steel with a typical composition of 20% Cr - 25% Ni - 4.5% Mo - 1.5% Cu - balance Fe....
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![S32654]()
S32654S32654 is a high-alloy super austenitic stainless steel with a typical composition of 24% Cr - 22% Ni - 7.3% Mo - 0.50% N - 3.0% Mn - 0.5% Cu - Fe balance. It is one of the highest grades in terms...
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![S31254]()
S31254S31254 (254 SMO® Super Austenitic Stainless Steel) is a high-alloy super austenitic stainless steel with a typical composition of 20% Cr - 18% Ni - 6.1% Mo - 0.20% N - 0.70% Cu - balance Fe. It is...
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![S32760]()
S32760S32760 (Zeron 100 Super Duplex Stainless Steel) is a third-generation super duplex stainless steel, belonging to the austenitic-ferritic duplex stainless steel family. Its typical composition...
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![S32750]()
S32750S32750 (2507 Super Duplex Stainless Steel) is a third-generation super duplex stainless steel belonging to the austenitic-ferritic duplex stainless steel family. Its typical nominal composition...
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![S32205]()
S32205S32205 (2205 Duplex Stainless Steel) is a second-generation standard duplex stainless steel belonging to the austenitic-ferritic type. Its typical composition is 22% Cr - 5.5% Ni - 3.2% Mo - 0.17%...
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![S31803]()
S31803S31803 (2205 Duplex Stainless Steel) is a second-generation standard duplex stainless steel belonging to the austenitic-ferritic type. Its typical composition includes 21-23% Cr, 4.5-6.5% Ni,...
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![S32950]()
S32950S32950 is a second-generation standard duplex stainless steel belonging to the austenitic-ferritic duplex stainless steel family, with a typical composition of 26-29% Cr, 3.5-5.2% Ni, 1.0-2.5% Mo,...
Industrial Applications of Duplex Stainless Steel
Oil & Gas
Our duplex stainless steel pipes, tubes, flanges, and fittings are widely used in upstream, midstream, and downstream facilities, offering excellent resistance to chloride-induced corrosion and high-pressure environments.
Offshore & Marine
Designed to withstand harsh seawater exposure, Duplex Stainless Steel are ideal for offshore platforms, subsea systems, shipbuilding, and marine structural components.
Chemical Processing
For reactors, storage tanks, pipelines, and heat exchangers handling corrosive chemicals, duplex stainless steel delivers outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking.
Desalination Plants
Our duplex stainless steel materials provide reliable performance in seawater desalination systems, including evaporators, pumps, valves, and high-pressure piping.
Power Generation
Used in condensers, cooling water systems, boilers, and pressure vessels, duplex stainless steel offers high mechanical strength and long service life in demanding power generation.
Pulp & Paper
Duplex stainless steel is an excellent choice for digesters, bleaching equipment, and chemical recovery systems where corrosion resistance and durability are essential.
Our Successful Project Case
Duplex Stainless Steel 2205 Pipes for High-Chloride Chemical Transportation System
Project Background
A fine chemical manufacturing company required a reliable piping system for transporting high-chloride corrosive media. The existing 304/ 316 stainless steel system experienced corrosion issues and could not meet long-term operational safety requirements.
Our SolutionWe supplied a complete duplex stainless steel 2205 solution, including:
• Duplex Stainless Steel S32205 Seamless Pipes
• Matching Duplex Stainless Steel Fittings
All materials were manufactured in compliance with international standards and provided with full Mill Test Certificates (MTC) for traceability and quality assurance.
Project Results & Benefits• Excellent resistance to high-chloride corrosion environments
• Significantly improved performance compared to 304/316 stainless steel
• Service life exceeding 20 years under normal industrial conditions
• Reduced maintenance frequency and overall lifecycle cost
• One-stop supply of pipes and fittings improved procurement efficiency
Why Choose Us As Your Duplex Stainless Steel Supplier
Flexible Stock & Production Model
We maintain several hundred tons of standard duplex stainless steel grades (round bars, plates, pipes) in stock at major domestic ports. This enables fast response for small-batch, multi-order, and urgent procurement needs for R&D and project requirements.
Global Service Network Collaboration
We cooperate with local engineering service providers, machining workshops, and logistics partners in key markets worldwide.
This allows us to support customers with:
• Local technical assistance
• Emergency part machining or replacement
• Reliable regional service coordination
This allows us to support customers with:
• Local technical assistance
• Emergency part machining or replacement
• Reliable regional service coordination
Continuous R&D Investment
We allocate a fixed percentage of annual revenue to research and development, focusing on:
• New material application development
• Optimization of special heat treatment processes
• Pre-research on customer-specific engineering challenges
• New material application development
• Optimization of special heat treatment processes
• Pre-research on customer-specific engineering challenges
Quality Assurance & Traceability
Each shipment is provided with a Mill Test Certificate (MTC) fully traceable to the original production batch. If required, third-party testing can be jointly arranged with CNAS / ILAC accredited laboratories to verify material data and ensure compliance.
2000+ m²
In-House Factory
1,000+ Tons
Annual Steel Supply
30+
Countries Exported
15+
Years Industry Experience
10+
Patents in Materials & Manufacturing
100%
Recyclable Materials
FAQ
Q: How do you ensure material consistency between different production batches?
A: We implement strict production control and batch-based traceability. Each heat is tested and recorded, with samples retained for a minimum of 5 years. This guarantees that every batch you receive matches the specified chemical composition and mechanical properties — and is fully traceable back to the original mill certificate
Q: Why is super duplex stainless steel more expensive than standard duplex grades?
A: The higher cost is primarily driven by elevated levels of molybdenum, chromium, and nitrogen, which significantly enhance pitting resistance (PREN > 40) and yield strength compared to standard duplex grades. Additionally, tighter metallurgical controls during hot forming and solution annealing are required to maintain phase balance, contributing to the premium but justifiable price for critical service environment.
Q: Do you provide material selection support for engineering projects?
A: Yes. Our technical team offers application-specific material selection guidance, taking into account service temperature, chloride concentration, pH levels, mechanical loading, and expected service life. We can also recommend between lean duplex, standard duplex, and super duplex grades based on your project's PREN and NACE/MR0175 requirements.
Q: What factors affect the cost of duplex stainless steel?
A: The cost of duplex stainless steel is mainly influenced by:
• Grade & alloy content (e.g., 2205 vs. 2507)
• Product form (pipe, plate, bar, fitting)
• Dimensions & tolerances
• Order quantity — larger volumes typically lower per-unit cost
• Processing requirements (cutting, threading, grooving, coating)
• Raw material market fluctuations
We offer free cost-saving suggestions — such as optimizing dimensions to reduce cutting waste — to help you get the best value.
• Grade & alloy content (e.g., 2205 vs. 2507)
• Product form (pipe, plate, bar, fitting)
• Dimensions & tolerances
• Order quantity — larger volumes typically lower per-unit cost
• Processing requirements (cutting, threading, grooving, coating)
• Raw material market fluctuations
We offer free cost-saving suggestions — such as optimizing dimensions to reduce cutting waste — to help you get the best value.
Q: Is duplex stainless steel available in both standard and custom machining forms?
A: Absolutely. We supply standard mill shapes — including plate, sheet, bar, pipe, and fittings — as well as custom-machined or fabricated components. For custom work, we can execute turning, milling, drilling, and welding per your drawing or specification, with full traceability and inspection documentation.
Q: Can you support engineering drawing-based production?
A: Yes. We routinely manufacture duplex and super duplex components to customer-provided engineering drawings, 3D models, or written specifications. Our production follows ISO 9001 and PED/ASME standards, with full dimensional inspection reports, PMI testing, and mechanical property certificates available upon delivery.
With abundant experience, we are one of the most professional duplex stainless steel manufacturers and suppliers in China. We are committed to providing high quality metal products for global clients. Please feel free to wholesale bulk high-grade duplex stainless steel in stock here from our factory.
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Need the Right Material And Supply Solution For Your Project?
Please inform us of your requirements regardingmaterial grade, product form, or applications, andour technical team will provide a suitable solutionand a fast quotation.
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