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Ahmed Sheets and Plates is a reputable manufacturer and supplier based in Safat, Kuwait, specializing in high-quality Duplex Steel S31803 Circles. These circles are perfect for industries that demand exceptional strength, corrosion resistance, and durability. The S31803 grade is well-known for its unique dual-phase microstructure, which combines austenite and ferrite, offering remarkable resistance to stress corrosion cracking, pitting, and crevice corrosion. At Ahmed Sheets and Plates, they prioritize precise fabrication, rigorous quality control, and adherence to international standards, ensuring that their Duplex Steel circles perform reliably even in the toughest environments. Their products find extensive use in chemical, petrochemical, marine, and offshore applications, where long-term performance and safety are paramount.
Duplex Steel S31803 Circle consists of approximately 22-23% Chromium, 4.5-6.5% Nickel, 3-3.5% Molybdenum, with controlled additions of Manganese, Silicon, and Nitrogen, balanced with Iron. This composition provides outstanding corrosion resistance and strength. It offers a tensile strength of about 620 MPa, yield strength of 450 MPa, and excellent elongation of 25%. With a high hardness range (HRB 80-90), it performs exceptionally in demanding conditions. Its balanced ferritic-austenitic structure ensures superior resistance to stress corrosion cracking and thermal stability, making it ideal for heavy-duty applications.
| Standard | ASTM A240, ASME SA240 |
| Dimensions | ASTM, ASME and API |
| Standard | JIS, AISI, ASTM, GB, DIN, EN, etc. |
| Thickness | 1 Mm To 100 mm. |
| Diameter | Upto 2000 Mm. |
| Circle Diameter | 3″ DIA up to 38″ DIA 1500 lbs max. |
| Circles Form | Cold Rolled, Small Flat, Industrial, Proof Machined, Perforated, Forged Steel, Cnc Finish, Polished Unique, Hot Rolled Circle.. |
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex 1803 | 1.4462 | S31803 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 | 7.805 | 0.285 | 1420 – 1465 | 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.
The Duplex Steel S31803 Circles provided by Ahmed Sheets and Plates typically contain a composition of Chromium (21%), Nickel (5–6.5%), Molybdenum (2.5–3%), and Nitrogen (0.08–0.20%), with Iron making up the rest. This blend of elements results in high tensile strength, excellent yield strength, and outstanding resistance to localized corrosion. Thanks to its duplex microstructure, S31803 offers superior fatigue performance and thermal stability compared to standard austenitic stainless steels. These mechanical and chemical properties make it an ideal choice for applications where both strength and corrosion resistance are crucial.
Duplex Steel S31803 Circles offer several advantages, making them ideal for industrial applications. Their dual-phase microstructure provides exceptional strength and toughness, outperforming many conventional stainless steels. These circles have excellent corrosion resistance, especially against pitting, crevice corrosion, and stress corrosion cracking, even in harsh environments. They exhibit superior thermal conductivity and low thermal expansion, ensuring stability under temperature fluctuations. With high weldability and machinability, they are suitable for complex fabrication. Additionally, Duplex S31803 Circles offer a cost-effective solution due to reduced material thickness without compromising durability and performance.
You’ll find Duplex Steel S31803 Circles from Ahmed Sheets and Plates widely utilized in industries that deal with aggressive chemicals and seawater. They are often used in heat exchangers, pressure vessels, chemical reactors, piping systems, and valves. Offshore and marine applications particularly benefit from their resistance to chloride-induced corrosion and impressive mechanical strength. The petrochemical industry counts on S31803 circles for reactors, storage tanks, and process equipment that face harsh conditions. Other applications include desalination plants, the pulp and paper industry, and various industrial systems where durability, safety, and resistance to harsh chemical environments are essential.
Duplex Steel S31803 Circles are widely used in industries demanding high strength and corrosion resistance. In the oil and gas sector, they are ideal for pipelines, heat exchangers, and offshore platforms due to their resistance to stress corrosion cracking. They are extensively applied in chemical processing, desalination plants, and marine environments where pitting and crevice corrosion resistance are crucial. Power generation industries utilize them in pressure vessels and boilers. Additionally, they are employed in architectural structures, food processing equipment, and paper and pulp industries for their durability and thermal stability.
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