Duplex Stainless Steel (DSS) combines the best features of austenitic and ferritic stainless steels, offering exceptional strength (2x that of 304/316) and outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. Its unique microstructure—50% austenite and 50% ferrite—makes it ideal for harsh environments like marine, chemical processing, and oil & gas industries. Welcome to inquire and contact us about the lastest price for sale. As the leading of stainless steel manufacturer in China, our stainless steel is good quality.
At Stainless Steel Market, we are a trusted global supplier of Duplex Stainless Steel. We maintain large stock inventory and provide customized sizes and shapes upon request.
Grades: UNS S31803 / UNS S32205 (2205 Duplex)
Services: Cutting, polishing, heat treatment, export packaging
Quality: Certified to ASTM, EN, DIN, JIS, GB international standards
Fast Delivery: Export-ready with competitive shipping solutions
Duplex Stainless Steel
In Stainless Steel Market, we take pride in providing premium martensitic stainless steel products for your most demanding projects. With competitive pricing, fast shipping, and superior customer service, we’re here to be your trusted stainless steel supplier. Our company has the good service and professional expert for solutions to you.
Duplex Stainless Steel is a premium-grade alloy that combines the strength of ferritic stainless steel with the corrosion resistance of austenitic stainless steel. With a dual-phase microstructure, it offers superior mechanical properties and excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. Available grades include UNS S31803 / 2205 Duplex Stainless Steel and UNS S32205, which are widely used in industries where both strength and corrosion resistance are critical.
Composition & Grades of Duplex Stainless Steel
| Grade | UNS No. | C (max) | Cr | Ni | Mo | N | Mn (max) | Si (max) | P (max) | S (max) | Cu | W | Other |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2304 | S32304 | 0.030 | 21.5-24.5 | 3.0-5.5 | 0.05-0.6 | 0.05-0.20 | 2.5 | 1.0 | 0.040 | 0.040 | 0.05-0.6 | – | – |
| 2205 | S31803/S32205 | 0.030 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | 2.0 | 1.0 | 0.030 | 0.020 | – | – | – |
| 2507 | S32750 | 0.030 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | 1.2 | 0.8 | 0.035 | 0.020 | 0.5 | – | – |
| 255 | S32760 | 0.030 | 24.0-26.0 | 5.5-7.5 | 3.0-4.0 | 0.20-0.30 | 1.0 | 1.0 | 0.030 | 0.010 | 0.5-1.0 | 0.5-1.0 | – |
Key Features and Benefits:
High Strength: Almost double the strength of conventional stainless steels.
Excellent Corrosion Resistance: Resistant to chloride stress corrosion cracking and seawater conditions.
Durability: Superior fatigue resistance and long service life.
Cost Efficiency: Reduced material thickness required due to higher strength.
Versatility: Available in plate, coil, strip, bar, wire, and pipe forms.
Duplex Stainless Steel of Mechanical Property
| Property | 2205 (S32205) | 2507 (S32750) | Unit |
|---|---|---|---|
| Density | 7.8 | 7.8 | g/cm³ |
| Yield Strength | 450 | 550 | MPa |
| Tensile Strength | 620 | 795 | MPa |
| Elongation | 25 | 15 | % |
| PREN Value | 34-38 | 42-45 | – |
| Thermal Expansion | 13.0 | 13.0 | μm/m·°C |
Applications of Duplex Stainless Steel
As a leading authority in the metal industry, we are committed to providing our customers with not only the highest quality duplex stainless steel pipe products but also the expertise and knowledge to ensure their success. Our team of metallurgical experts is always available to help you select the right materials for your projects and to provide guidance on corrosion prevention and best practices. Welcome to inquire and consult more details about steel.
Duplex stainless steel is widely used across multiple industries:
Oil & Gas: Offshore platforms, pipelines, subsea equipment.
Chemical Processing: Heat exchangers, pressure vessels, storage tanks.
Marine Engineering: Shipbuilding, seawater desalination, propeller shafts.
Construction: Bridges, architectural facades, structural supports.
Pulp & Paper Industry: Digesters, bleaching equipment.
Comparision with Other Material
| Property | 304/304L | 316/316L | 2205 Duplex | 2507 Super Duplex |
|---|---|---|---|---|
| Yield Strength | 215 MPa | 220 MPa | 450 MPa | 550 MPa |
| Corrosion Resistance | Good | Very Good | Excellent | Superior |
| Stress Corrosion Cracking Resistance | Fair | Good | Excellent | Excellent |
| Cost Efficiency | Good | Fair | Excellent | Good |
Why Choose Us as Duplex Stainless Steel Supplier?
As a premier Chinese stainless steel metal steel supplier, we combine technical depth, cost efficiency, and service excellence to provide tailored solutions. Choose the right steel for your application—and count on us to deliver quality, performance, and price competitiveness.Duplex Stainless Steel Plate has many function in every industrial processing and the application is durable over ten years even more. Contact us today to take your project forward!
Strong Production Capacity: Large inventory with full range of alloys (Duplex, Inconel, Hastelloy, Monel, Titanium, Precision Alloys).
Custom Solutions: Tailored products according to drawings & technical requirements.
Global Export Experience: Reliable supply to more than 60 countries.
Competitive Pricing: Direct factory supply with quality assurance.
FAQ
Super duplex stainless steels (like 2507) have higher chromium, molybdenum, and nitrogen content than standard duplex (like 2205), providing even greater corrosion resistance and strength, particularly in aggressive chloride environments.
Yes, duplex stainless steels can be welded using common techniques, but they require careful control of heat input and shielding gas composition to maintain the optimal austenite-ferrite balance in the weld zone.
We supply duplex and super duplex stainless steel in various forms including sheets, plates, pipes, tubes, bars, and fittings. We also provide custom cutting and machining services.
For standard sizes and grades, we typically ship within 3-5 business days. Custom sizes and larger quantities may require 2-3 weeks. Express shipping is available for urgent requirements.