Duplex Steel Plates and Sheets
Table of Contents
- Duplex Stainless Steel Plate and Sheet Forms Available
- Grades of Duplex Stainless Steel Plates and Sheets
- Manufacturing Standards and Specifications
- Surface Finishes Available
- Chemical Composition of Duplex Stainless Steel Plates and Sheets
- Mechanical Properties of Duplex and Super Duplex Plates
- Equivalent Grades of Duplex Stainless Steel Plates
- Applications of Duplex Stainless Steel Plates and Sheets
- Price of Duplex Stainless Steel Plates and Sheets
- Why Choose Stellar Alloys
- Frequently Asked Questions on Duplex Stainless Steel Plates and Sheets
Duplex stainless steel plates and sheets are designed to be used in such applications that require a high mechanical strength, high corrosion resistance and structural reliability in the long term. These flat products have a dual-phase microstructure providing excellent resistance to chloride stress corrosion cracking, unlike traditional stainless steels and still having high load-bearing capacity.
Chemical processing, oil and gas, marine, offshore, power generation, and desalination industries are all using duplex stainless steel plates and sheets in their pressure vessels, storage tanks, heat exchangers and structural components that are in the aggressive environment. They have a greater yield strength that allows thin portions, that lowers the total weight without decreasing the safety.
Being a reliable distributor and stockist of duplex and super duplex stainless steel plates and sheets, Stellar Alloys offers an extensive grade, thickness, finish and sizes selection of duplex and super duplex stainless steel plates and sheets with full product traceability and global project supply capability.
Duplex Stainless Steel Plate and Sheet Forms Available
Duplex Steel Shim Sheets
Duplex steel shim sheets are thin flat products used for spacing, alignment, and precision fitting in industrial assemblies. These sheets offer excellent corrosion resistance and dimensional stability in chemical and marine environments.
Duplex Perforated Sheets
Duplex perforated sheets are manufactured with uniform hole patterns for filtration, screening, ventilation, and architectural applications. They provide high strength with controlled open area and corrosion resistance.
Duplex Steel Chequered Plates
Duplex steel chequered plates feature raised patterns that improve slip resistance. These plates are commonly used in walkways, platforms, staircases, and offshore structures exposed to corrosive environments.
Duplex Steel Coils
Duplex steel coils are supplied for large-scale fabrication, slitting, and forming operations. Coils allow efficient processing into sheets, strips, and custom components while maintaining consistent mechanical properties.
Duplex Steel Strips
Duplex steel strips are narrow-width flat products used in fabrication, clamps, fasteners, and precision components. They offer high tensile strength and resistance to stress corrosion cracking.
Duplex Steel Foils
Duplex steel foils are ultra-thin flat products used in specialized industrial applications requiring corrosion resistance with minimal thickness. These are supplied for controlled environments and precision uses.
Duplex Steel Hot Rolled Sheets
Hot rolled duplex steel sheets are used where thickness uniformity and structural strength are required. These sheets are suitable for heavy fabrication, pressure vessels, and structural components.
Duplex Steel Cold Rolled Plates
Cold rolled duplex steel plates provide improved surface finish and tighter dimensional tolerances. These plates are commonly used for precision fabrication and equipment manufacturing.
Matt PVC Duplex Steel Sheets
Matt PVC duplex steel sheets are supplied with a protective PVC coating to prevent surface damage during handling, storage, and fabrication. These sheets are preferred where surface finish retention is critical.
Grades of Duplex Stainless Steel Plates and Sheets
Duplex Stainless Steel Grades
- Duplex 2205
- UNS S31803
- UNS S32205
Super Duplex Stainless Steel Grades
- Super Duplex 2507
- UNS S32750
- UNS S32760
Manufacturing Standards and Specifications
Applicable Standards
- ASTM A240
- ASTM A480
- ASTM A479
- ASME SA 240
Available Sizes and Thickness
- Plates: Wide thickness range available
- Sheets: Thin to medium thickness range available
- Width & Length: Standard and custom cut sizes
- Supply Condition: Hot rolled and cold rolled
Surface Finishes Available
Duplex stainless steel plates and sheets are supplied in multiple finishes to suit fabrication, welding, and aesthetic requirements.
- Hot Rolled Finish
- Cold Rolled Finish
- Annealed and Pickled
- Polished Finish
- No. 1, No. 2B, and customized finishes
Chemical Composition of Duplex Stainless Steel Plates and Sheets
Grade | Chemical Composition |
Duplex 2205 (UNS S31803 / S32205) | Composition as per ASTM A240 including controlled levels of Chromium, Nickel, Molybdenum, Manganese, Nitrogen, and Carbon for balanced corrosion resistance and strength. |
Super Duplex 2507 (UNS S32750) | High alloy composition as per ASTM A240 with increased Chromium, Molybdenum, and Nitrogen to enhance pitting resistance and chloride stress corrosion resistance. |
Super Duplex UNS S32760 | Enhanced alloy chemistry as per ASTM A240 incorporating Tungsten and Copper additions for improved performance in seawater and aggressive chemical environments. |
Mechanical Properties of Duplex and Super Duplex Plates
Grade | Mechanical Properties |
Duplex 2205 (UNS S31803 / S32205) | High yield and tensile strength with excellent elongation as specified under ASTM A240. Offers superior mechanical performance compared to conventional austenitic stainless steels. |
Super Duplex 2507 (UNS S32750) | Very high tensile and yield strength with controlled hardness, designed for high-pressure and high-chloride service conditions as per ASTM A240. |
Super Duplex UNS S32760 | Exceptional mechanical strength and impact resistance as per ASTM standards, suitable for offshore, marine, and severe corrosive environments. |
Equivalent Grades of Duplex Stainless Steel Plates
UNS | ASTM | EN | DIN |
S31803 | A240 | 1.4462 | X2CrNiMoN22-5-3 |
S32750 | A240 | 1.441 | X2CrNiMoN25-7-4 |
Applications of Duplex Stainless Steel Plates and Sheets
Duplex and super duplex stainless steel plates and sheets are used in a wide range of critical industrial applications.
- Chemical processing equipment
- Pressure vessels and storage tanks
- Heat exchangers and condensers
- Offshore platforms and subsea structures
- Marine engineering components
- Oil and gas refineries
- Desalination and water treatment plants
Price of Duplex Stainless Steel Plates and Sheets
Grade | Thickness Range | Price Basis |
Duplex 2205 | Varies | On request |
Super Duplex 2507 | Varies | On request |
Why Choose Stellar Alloys
Engineers, EPC contractors, and procurement teams with Stellar Alloys place their trust in the company to provide duplex and super duplex stainless steel plates and sheets of superior quality that will meet the high international standards. We use certified mills to obtain our materials, and they are provided with full traceability to guarantee uniform quality and performance.
We keep standard grades and sizes in stock, and also accommodate demands of a particular project with special processing and cutting of wood. The orders are supported by Mill Test Certificates according to EN 10204, third-party inspection which is optional but necessary to provide safe deliveries all over the world and export-grade packaging.
The technical team helps our clients in the selection of the grade, compliance in specifications, and applicability, thereby decreasing the procurement risk and enhancing the project efficiency.
Quality Assurance and Testing
- Positive Material Identification
- Ultrasonic Testing
- Mechanical Testing
- Chemical Analysis
- Intergranular Corrosion Testing
- Dimensional Inspection
Stock Availability and Product Forms
Duplex stainless steel flat products available or planned for supply include:
- Duplex Plates
- Duplex Sheets
- Duplex Coils
- Duplex Strips
- Duplex Shim Sheets
Related Link
Frequently Asked Questions on Duplex Stainless Steel Plates and Sheets
Duplex stainless steel plates and sheets are flat products manufactured with a dual-phase microstructure consisting of austenitic and ferritic phases. This structure provides higher mechanical strength and improved resistance to stress corrosion cracking compared to conventional austenitic stainless steels, making duplex materials suitable for demanding industrial environments.
Duplex stainless steel plates, such as Grade 2205, offer an excellent balance of strength and corrosion resistance for general industrial applications. Super duplex stainless steel plates, including Grades 2507 and UNS S32760, contain higher alloy content and provide superior resistance to pitting, crevice corrosion, and chloride-induced corrosion, making them ideal for offshore and marine applications.
Commonly supplied duplex grades include Duplex 2205 (UNS S31803 and UNS S32205). Super duplex grades typically include Super Duplex 2507 (UNS S32750) and UNS S32760. Additional grades can be supplied based on project specifications and industry standards.
Yes, duplex and super duplex stainless steel plates are widely used in marine and offshore environments due to their excellent resistance to chloride corrosion and high mechanical strength. Super duplex grades are especially preferred for seawater handling systems, offshore platforms, and desalination plants.
Duplex stainless steel plates and sheets are commonly manufactured and supplied in accordance with ASTM A240, ASTM A480, ASTM A479, and ASME SA 240 standards. Compliance with these standards ensures consistent chemical composition, mechanical properties, and dimensional accuracy.
Yes, duplex stainless steel plates and sheets are supplied with Mill Test Certificates in accordance with EN 10204. These certificates confirm chemical composition, mechanical properties, and compliance with applicable standards, ensuring full material traceability.
Duplex stainless steel plates and sheets can be supplied in standard sizes as well as custom-cut dimensions based on fabrication requirements. Multiple surface finishes are available, including hot rolled, cold rolled, annealed and pickled, and polished finishes, depending on application needs.
