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Duplex Steel S31803 Sheet and Plates are celebrated for their remarkable strength, resistance to corrosion, and durability, making them a top choice in demanding industrial fields. These plates boast a unique dual-phase microstructure that combines the best features of both ferritic and austenitic stainless steels. Crafted with precision, Duplex S31803 sheets and plates provide outstanding protection against pitting, crevice corrosion, and stress corrosion cracking, even in tough, chloride-rich settings. Their impressive mechanical properties, ease of welding, and cost-effectiveness make them perfect for applications in chemical processing, marine engineering, oil and gas production, and various structural components that require enhanced durability and reliability.
Duplex Steel S31803 Sheet and Plates are made from a well-balanced blend of chromium (approximately 22%), molybdenum, nickel, and nitrogen, which boosts their strength and corrosion resistance. The duplex microstructure ensures high tensile and yield strength, excellent toughness, and remarkable fatigue performance. S31803 plates are characterized by low thermal expansion, good weldability, and strong resistance to stress corrosion cracking and pitting. These mechanical traits make them ideal for high-pressure and high-temperature environments, guaranteeing stable performance, durability, and structural integrity in demanding industrial applications.
| Size | : | 1/2″NB TO 4″NB IN |
| Standard | : | ASTM A182 / ASME SA182 |
| Dimensions | : | ANSI/ASME B16.11 & BS3799, etc. |
| Grade | : | UNS S31803, S32205, S2205, S32550, S32750, S32760. |
| Class | : | 2000LBS, 3000LBS, 6000LBS, 9000LBS, etc. |
| UNS S31803 | Ni | Cr | Mo | Mn | Si | C | N | S | P | Fe |
| min | 4.5 | 22.0 | 3.0 | – | – | – | 0.14 | – | – | – |
| max | 6.5 | 23.0 | 3.5 | 2.0 | 1.0 | 0.03 | 0.2 | 0.02 | 0.03 | Balance |
| Grade | S31803 |
| Density (g/cm 3) | 7.805 |
| Density (lb/in 3) | 0.285 |
| Melting Point (°C) | 1420 – 1465 |
| Melting Point (°F) | 2588 – 2669; |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Duplex Steel Sheet and Plates S31803 offer exceptional strength, corrosion resistance, and durability, making them ideal for harsh environments. With a balanced microstructure of austenite and ferrite, they provide higher resistance to stress corrosion cracking and pitting. These plates are highly resistant to chloride environments, ensuring long-lasting performance in industries like oil and gas, chemical processing, and marine applications. Their excellent weldability and formability make them versatile for various fabrication processes, while their cost-effectiveness compared to high-alloy steels makes them a popular choice for demanding applications.
| Duplex 2205 | UNS S31803 | 1.4462 | F51 |
| Thickness (mm) | Length x width (mm) | Length x width (mm) | Length x width (mm) | Length x width (mm) | Length x width (mm) |
| 5 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 6 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 8 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 10 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 12 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 15 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 16 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 20 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 25 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 30 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 35 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 40 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 45 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 50 | 4000 x 2000 | 6000 x 2000 | 6000 x 2500 | 6000 x 3000 | 8000 x 2000 |
| 60 | 4000 x 2000 | ||||
| 70 | 4000 x 2000 | ||||
| 80 | 4000 x 2000 | ||||
| 90 | 4000 x 2000 | ||||
| 100 | 4000 x 2000 |
| Surface finish | Thickness (mm) | Width (mm) |
|---|---|---|
| 2B – Cold rolled, heat treated, pickled, skin passed | 0.25–8.0 | max. 2032 |
| 2D – Cold rolled, heat treated, pickled | 0.4–6.35 | max. 1524 |
| 2E – Cold rolled, heat treated, mechanically descaled | 0.4–8.0 | max. 2032 |
| 2R – Cold rolled, bright annealed | 0.25–3.5 | max. 1524 |
| 2H – Work hardened | 0.4–6.35 | max. 1524 |
| Polished, brushed | 0.5–4.0 | max. 1524 |
Duplex Steel S31803 Sheet and Plates find extensive use in settings that demand high strength and corrosion resistance. Industries like oil and gas, chemical processing, petrochemical, and marine engineering depend on them for heat exchangers, pressure vessels, storage tanks, and process equipment. Their resistance to chloride-induced corrosion makes them particularly suitable for desalination plants, offshore platforms, and pipelines. In construction, they are favored for their reliability and performance in challenging environments, ensuring that structures remain safe and effective over time.
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