CUNRUI Metal : Your Leading Duplex Steel Supplier in China
CUNRUI Metal is a leading global supplier of high‑quality steel and metal products. With more than 20 years of industry experience, advanced production facilities, and strict quality control systems, we deliver materials that meet international standards and customer specifications.
Extensive Product Range
Our product catalog covers a wide variety of steel products, from coils and plates to pipes, bars, and profiles, meeting the diverse needs of purchasing professionals.
Customized Solutions
We offer customized services, including cutting, slitting, coating, and special processing, to meet your project requirements.
Rapid Response and Support
Our team provides rapid technical support, accurate quotations, and professional customer service to assist your purchasing decisions and delivery schedules.
Highly Competitive Pricing
With efficient operations and robust supply chain management, we offer highly competitive prices while ensuring product quality, helping buyers effectively control costs.
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![S31254 Duplex Stainless Steel Plate]()
S31254 Duplex Stainless Steel PlateS31254 Duplex Stainless Steel Plate is a super-austenitic stainless steel with high Cr, Ni, Mo, and N for offshore, marine, oil & gas, and chemical applications. -
![2205 Duplex Stainless Steel Coil]()
2205 Duplex Stainless Steel Coil2205 duplex stainless steel coil is an alloy stainless steel coil composed of austenitic and ferritic two-phase structures. It is mainly used for structural components, pressure equipment and media -
![S31803 Duplex Steel Bar]()
S31803 Duplex Steel BarThe S31803 Duplex Stainless Steel Bar features austenitic-ferritic microstructures, meets ASTM A276/A479 and EN 10088 standards, and is suitable for petrochemical, marine, chemical, and water -
![Super Duplex Steel UNS S32760 Round Bar]()
Super Duplex Steel UNS S32760 Round BarThe S31803 Duplex Stainless Steel Bar features austenitic-ferritic microstructures, meets ASTM A276/A479 and EN 10088 standards, and is suitable for petrochemical, marine, chemical, and water -
![Super Duplex Steel UNS S32950 Round Bar]()
Super Duplex Steel UNS S32950 Round BarSuper Duplex Steel UNS S32950 Round Bar combines high strength, corrosion resistance, and superior toughness, suitable for structural and fabrication applications in marine and chemical environments. -
![2205 Duplex Stainless Steel Wire]()
2205 Duplex Stainless Steel Wire2205 duplex stainless steel wire is a wire product made from duplex stainless steel as the base material through a drawing process. -
![S31803 Duplex Stainless Steel Wire]()
S31803 Duplex Stainless Steel WireS31803 Duplex Stainless Steel Wire offers high strength and corrosion resistance, perfect for marine, chemical, and industrial applications needing durable, long-lasting wire.
Introduction
Duplex steel is a type of stainless steel with a dual-phase microstructure consisting of austenite and ferrite. This balanced structure provides a unique combination of high strength and excellent corrosion resistance, making it ideal for demanding environments.
Parameter
|
Parameter |
Specification Range / Standard |
|
Grade / Standard |
ASTM A240 / ASME SA240 / UNS S31803 / EN 1.4462 |
|
Thickness |
3mm – 100mm (customizable) |
|
Width |
1000mm – 3000mm (cut-to-size available) |
|
Length |
2000mm – 12000mm or customized |
|
Surface Finish |
2B, BA, No.1, No.4, HL, or polished |
|
Yield Strength (Rp0.2) |
≥ 450 MPa |
|
Tensile Strength (Rm) |
620 – 880 MPa |
|
Elongation (%) |
≥ 25% |
|
Hardness |
≤ 290 HB |
|
Corrosion Resistance |
Excellent resistance to chloride and seawater environments |
|
Certificates |
MTC, SGS, BV, TUV, ISO 9001, CE |
High Strength - Higher yield strength than standard austenitic stainless steel, suitable for heavy-duty structures.
Excellent Corrosion Resistance - Strong resistance to pitting, crevice corrosion, and chloride environments.
Good Toughness - Maintains mechanical performance under impact and stress conditions.
Stress Corrosion Cracking Resistance - Performs well in harsh chemical and marine environments.
Good Weldability - Suitable for fabrication and structural applications.
Material Grades
Duplex steel is commonly classified into the following categories:
|
Type |
Features |
Common Grades |
|
Lean Duplex |
Lower alloy content, cost-effective |
2101, 2304 |
|
Standard Duplex |
Balanced performance |
2205 (S31803/S32205) |
|
Super Duplex |
Higher corrosion resistance |
2507 (S32750) |
|
Hyper Duplex |
Extreme performance environments |
Advanced grades |
Sizes & Dimensions: Custom thickness, diameter, and length
Material Grades: Selection based on corrosion and strength requirements
Surface Finish: Polished, pickled, or coated
Processing: Cutting, machining, or fabrication
Supply Forms: Plates, pipes, bars, or customized shapes
Applications
Duplex steel is widely used in industries requiring high strength and corrosion resistance:
Oil & Gas (pipelines, offshore structures)
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Chemical and petrochemical processing
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Marine and desalination systems
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Construction and infrastructure
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Pulp and paper industry
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Quality Assurance
Mill Test Certificates (MTC)
Chemical composition and mechanical testing
Dimensional inspection and surface quality checks
Compliance with international standards
Certificate
FAQ
As one of the most experienced duplex steel manufacturers in China, we also support customized service. Please rest assured to buy cheap duplex steel for sale here from our factory. If you have any enquiry about pricelist and free sample, please feel free to email us.
