Semih Metals, located in Istanbul, Turkey, is a well-respected manufacturer and supplier of high-performance metal components, including Duplex Steel S31803 Forgings. With a strong focus on quality, precision, and durability, Semih Metals caters to industries that operate in harsh and corrosive environments, such as oil & gas, marine, petrochemical, and power generation. Duplex S31803 is celebrated for its impressive strength and corrosion resistance, making it a perfect choice for forged components. Semih Metals specializes in producing custom S31803 forgings that meet international standards and specific project needs, ensuring dependable performance and a long service life even in the toughest applications.
Duplex Steel S31803 is a nitrogen-enhanced duplex stainless steel primarily made up of iron (Fe), chromium (21–23%), nickel (4.5–6.5%), molybdenum (2.5–3.5%), and nitrogen (0.08–0.2%). This alloy boasts a well-balanced microstructure of austenite and ferrite, which provides high yield strength (around 450 MPa), excellent toughness, and outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. Forged S31803 components maintain these mechanical properties across a broad temperature range, while also offering good weldability and machinability. The forging process enhances the grain structure, leading to improved fatigue strength and structural integrity for critical service conditions.
| Specifications | ASTM A182, ASME SA182 |
|---|---|
| Standard | DIN, ASTM, BS and all International Standards |
| Flat bar blocks | up to 27″ width and 15,000 lbs |
| Cylinders and sleeves | up to 50″ maximum O.D. and 65″ maximum length |
| Discs and hubs | up to 50″ diameter and 20,000 lbs |
| Rolled, hand forged or mandrel forged rings | up to 84″ maximum O.D. and 40″ maximum length |
| Rounds, shafts and step shafts | up to 144″ maximum length and 20,000 lbs |
| Forging Types | Impression Die Forging, Open Die Forging, Seamless Rolled Forging, Hot Forging, Cold Forging, Open die hammer forging, Impression die drop forging, Closed Die Forging, Press Forging, Upset Forging, Compression Forging, Swaging, Rotary Forging, Roll forging. |
| 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 |
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex Steel S31803 | 1.4462 | S31803 |
The maximum operating temperature for Duplex Steel S31803 forgings is typically around 300°C (572°F). Beyond this temperature, the material may experience reduced strength and susceptibility to stress corrosion cracking.
Duplex Steel S31803 forgings are available in various sizes, including diameters ranging from 10 mm to 800 mm, and shapes like round, square, billets, blocks, and custom configurations, based on application needs.
Yes, S31803 Duplex Steel forgings are highly resistant to corrosion, especially in chloride-rich environments. They offer excellent protection against pitting, crevice, and stress corrosion cracking, making them ideal for harsh industrial applications.
Duplex Steel S31803 Forgings are extensively used in industries that demand high strength, corrosion resistance, and reliability under pressure. Common applications include forged flanges, valve components, pump shafts, pipe fittings, rings, and parts for pressure vessels. These forgings are particularly suited for offshore platforms, desalination plants, chemical processing equipment, and power generation systems, where chloride-rich or acidic environments present significant corrosion challenges. Semih Metals delivers top-notch solutions tailored to meet these demanding needs.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Semih Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Istanbul, Turkey
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