S31803 Stainless Steel Plate, also known as Duplex 2205 Plate, is a high-quality stainless steel plate that offers excellent strength and corrosion resistance. Manufactured according to the ASTM A240 standard, this UNS S31803 Plate is widely used in various industries due to its superior properties.
The S31803 Duplex Steel Plate is made from a combination of austenite and ferrite microstructure, which provides it with exceptional strength and toughness. This makes it suitable for applications in the chemical, petrochemical, and oil and gas industries, where it is exposed to harsh and corrosive environments.
With its exceptional corrosion resistance, the ASTM A240 UNS S31803 Duplex Stainless Steel Plate is highly resistant to pitting, crevice corrosion, and stress corrosion cracking. It also exhibits good resistance to chloride-induced stress corrosion cracking, making it an ideal choice for marine applications.
The S31803 Duplex Plate is available in various sizes and thicknesses, catering to the diverse needs of different applications. It can be easily fabricated and welded, allowing for easy customization and installation.
At a competitive S31803 Duplex Stainless Steel Plate price, it offers a cost-effective solution for various demanding applications. It is widely used in heat exchangers, pressure vessels, pipelines, and structural components.
As a prominent UNS S31803 Duplex Plate supplier, we offer high-quality products that meet international standards. Our Duplex SS S31803 Plate is inspected and tested for quality and reliability, ensuring customer satisfaction.
In summary, the S31803 Stainless Steel Duplex Plate is a highly versatile and durable solution that offers excellent strength and corrosion resistance. With its wide range of applications and exceptional properties, it is a preferred choice in various industries. Contact us today to get the best S31803 Duplex Stainless Steel Plate price and reliable supply.
The ASTM A240 specification encompasses a diverse range of stainless steel plates, sheets, and strips containing chromium, manganese, and nickel. These alloys are designed for usage in various applications. One of the notable stainless steel plates covered by ASTM A240 is the UNS S31803, which belongs to the duplex stainless steel category. Renowned for its exceptional resistance to corrosion, high strength, and excellent weldability, S31803 stainless steel plates adhere to the standardized ASTM A240 guidelines. Available in a wide array of sizes, thicknesses, and finishes, these duplex steel plates find extensive utility in the chemical processing, oil and gas exploration, and offshore industries. Popularly known as duplex 2205, this sheet exemplifies the remarkable properties of this innovative material.
- Good corrosion resistance
- High strength
- Excellent processability
- Ultra-low temperature strength
- High hardness
- Longer life

ASTM A240 S31803 Duplex Steel Plate Specifications
| Specifications | ASTM A240 , ASME SA240 |
| Thickness | 0.3mm-50mm |
| Sizes |
We offer a wide range of sheet sizes to suit your needs including 1000 mm x 2000 mm, 1220 mm x 2440 mm, 1250 mm x 2500 mm, and 1500 mm x 3000 mm. If you require larger sizes, we also have 2000 mm x 4000 mm to 6000 mm and 1500 mm x 3000 mm sheets available. Our range includes thicknesses of 2m, 2.44m, and 3m, as well as popular sizes such as 36" x 120" or 48" x 144" and 4' x 8'. We can even cut to size to meet your specific requirements. Whatever your need, we have the ideal sheet size for you! |
| Surface | There are various finishes available for stainless steel, including BA, 2B, 2D, NO.1, NO.4, NO.8, 8K, checkered, sandblast, brush, mirror, embossed, hairline, etching, and more. These finishes offer different textures, patterns, and levels of reflectivity or shine. Depending on your specific needs or preferences, you can choose the most suitable finish for your stainless steel products or components. Whether you want a smooth and glossy surface or a rough and rugged look, there's a finish that can meet your demands. Some finishes are easier to clean or maintain than others, while some are more resistant to scratches or corrosion. Therefore, it's important to consider the functional and aesthetic aspects of each finish before making a decision. |
| MOQ |
No Minimum Order Quantity |
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Test Report |
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Supplied Forms |
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| Sample | Provide free samples |
| Delivery time | 5-35 days |
Duplex S31803 Chemical Composition
| Cr | Chromium | 22.0 - 23.0% |
| Ni | Nickel | 4.5 - 6.5% |
| Mn | Manganese | 2.0% max |
| Si | Silicon | 1.0% max |
| P | Phosphorous | 0.03% max |
| S | Sulfur | 0.02% max |
| C | Carbon | 0.03% max |
| N | Nitrogen | 0.1 - 0.2% |
| Mo | Molybdenum | 3.0 - 3.5% |
| Fe | Iron | Balance |
UNS S31803 Mechanical Properties
| Grade | Tensile Str | Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness | |
| (MPa) min | |||||
| Rockwell C (HR C) | Brinell (HB) | ||||
| 2205 | 621 | 448 | 25 | 31 max | 293 max |
ASTM A240 GR S31803 UNS Plate Surface Finish
| Surface Finish | Thickness (mm) | Width (mm) |
| 1D – Hot rolled, heat treated, pickled Plate & Sheet | 2.4–12.7 | max. 2032 |
| 2B – Cold rolled, heat treated, pickled, skin passed Plate | 0.25–8.0 | max. 2032 |
| 2D – Cold rolled, heat treated, pickled Plate & Sheet | 0.4–6.35 | max. 1524 |
| 2R – Cold-rolled, bright-annealed ASTM A240 Duplex Steel S31803 Plate | 0.05–1.50 | 3–649 |
| 2E – Cold rolled, heat treated, mechanically descaled UNS S31803 Sheet | 0.4–8.0 | max. 2032 |
| 2R – Cold rolled, bright annealed ASTM A240 UNS S31803 Plate Sheet | 0.25–3.5 | max. 1524 |
| 2H – Work hardened SA 240 UNS S31803 Sheet Plate Strip | 0.4–6.35 | max. 1524 |
| Polished, brushed ASTM A240 UNS S31803 Plate | 0.5–4.0 | max. 1524 |
| ASTM A240 UNS S31803 Coil Sheet Plate Strip | 0.30–3.5 | max. 1,524 |
UNS S31803 Equivalent Material
S31803 duplex steel plate has a two-phase microstructure consisting of a ferrite phase and an austenite phase, which gives it excellent mechanical properties and corrosion resistance. ASTM A240 UNS S31803 plate also known as F51 or 1.4462 is the UNS S31803 equivalent material and complies with several other standards such as EN 1.4462, X2CrNiMoN22-5-3, and SS 2377.
ASTM A240 UNS S31803 Plate Manufacturing Process
- Pretreatment of raw materials: In the production process, the surface of the smelted steel block needs to be cleaned first to ensure that the surface of the product is smooth and clean, and to remove dirt and impurities on the surface.
- Hot rolling processing: Hot rolling processing refers to the process of heating the S31803 duplex plate to high temperature for plastic deformation, including three stages rough rolling, intermediate rolling, and finishing rolling. During hot rolling, the heating temperature should be kept above 1100°C to ensure that the billet can reach the degree of plastic deformation. At the same time, in order to ensure product quality, it is necessary to carry out directional control on the steel plate to ensure uniform thickness of the product.
- Steel plate cooling: S31803 duplex stainless steel plate after hot rolling needs to be cooled to make it reach the specified hardness and tensile strength for processing and use.
- Small plate cutting: After cooling, the steel plate will harden, and small plate cutting is required to obtain the size and shape that meet customer requirements.
NOTE: Tools and work surfaces must be thoroughly cleaned. These precautions are necessary to avoid cross-contamination of stainless steel with easily corroded metals that may discolor the finish of the finished product.
S31803 Stainless Steel Plate Application
- ASTM A240 UNS S31803 plate is used for chemical engineering components due to its mild to good corrosion resistance.
- ASME SA 240 UNS S31803 2b surface treated sheet can also be used for oil and gas industry components,
- ASTM A240 GR S31803 plate is suitable for pressure vessels and offshore drilling platforms.
- Duplex S31803 veneer is also used in chemical processing, transportation and storage structures.
- UNS S31803 DSS checker plate and stainless steel duplex ASTM A 240 S31803 hot rolled plate for automotive products.
- ASTM A240 S31803 cold-rolled plate is used in wear-resistant requirements such as mining industry.
- ASTM A240 GR UNS S31803 plate can be used in corrosive solutions, pulp and paper industry, marine utilities, pollution control systems and equipment, organic acid processing plants, oil and gas exploration, refineries, and the food industry.
UNS S31803 Duplex Plate Suppliers
Our UNS S31803 duplex plate suppliers are committed to providing customers with high-quality, efficient, and first-class services. We have complete production equipment and advanced technology to ensure the highest level of product quality and production efficiency. We have a professional technical team that can provide customized solutions to help customers choose the most suitable materials and specifications for different applications. We also provide perfect after-sales service, providing technical support, and warranty service for customers to ensure customer satisfaction.
HT PIPE is a professional stainless steel ASTM A240 UNS S31803 plate sheet strip supplier and manufacturer, S31803 stainless steel plate is exported to Indonesia, Malaysia, India, and other countries. We also supply UNS S31803 fittings, flanges, forgings, fasteners, pipes, tubes, plates, sheets, strips, coils, bars, rods, etc.
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