Home > Duplex Steel > Duplex Steel S31803 Stud Bolts
Bilal Nickel Alloys, headquartered in Safat, Kuwait, is a trusted manufacturer and supplier of Duplex Steel S31803 Stud Bolts, engineered for exceptional strength, corrosion resistance, and long-term reliability. These stud bolts are precision-manufactured to provide secure, leak-free connections in high-pressure, chemically aggressive, and marine environments. With extensive expertise in duplex stainless steels, Bilal Nickel Alloys ensures that every S31803 stud bolt meets stringent quality standards, combining mechanical durability with corrosion protection. Their commitment to precision engineering and customer satisfaction makes these stud bolts a preferred choice for industries requiring robust, high-performance, and corrosion-resistant fastening solutions for critical industrial applications.
Duplex Steel S31803 Stud Bolts are composed of iron, chromium (~22%), nickel (~5–6%), molybdenum (~3%), and nitrogen, forming a balanced duplex microstructure of ferrite and austenite. This composition provides excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, while offering high tensile strength, hardness, and ductility. Mechanically, these stud bolts maintain structural integrity under high-pressure and elevated-temperature conditions. Their robust microstructure ensures long-term durability, dimensional stability, and chemical resistance, making them ideal for critical industrial applications that require both mechanical strength and protection against aggressive environments.
| Grade | Duplex Steel UNS S31803 / S31803 |
| Specifications | ASTM A 479 ASME SA 479 |
| Dimension | DIN, ASTM, BS and all International Standards |
| Length | 3mm to 200mm |
| Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Types | Threaded Rod, Class A double ended stud, Tie Rod, Double Ended Stud, Stud Bolts, Bronze Hex Studs, Threaded Studs etc |
| S31803 | C | N | P | Si | Mn | Mo | Fe | Cr | S | Ni |
| 1.0 | 0.03 | 0.02 | 2.0 | 3.0 – 3.5 | 22.0 – 23.0 | 0.03 | 4.5 – 6.5 | 0.14 – 0.2 | Bal |
| S31803 | Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80000 , MPa – 550 | Psi – 116000 , MPa – 800 | 15 % |
At Bilal Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel S31803 Stud Bolts in Safat, Kuwait, providing cutting-edge solutions for all your piping needs. Our state-of-the-art production plants are strategically located in the Kuwait, allowing us to maintain a vast inventory of over 16,000 tons of premium-quality materials readily available in stock. We are dedicated to delivering superior products and services, ensuring reliability and excellence for our global clientele.
Contact us to get a quick quote for your requirement.
Duplex Steel S31803 Stud Bolts are widely used in chemical processing, petrochemical, oil and gas, marine, and offshore industries, where both corrosion resistance and mechanical performance are essential. They are ideal for fastening components in piping systems, reactors, pressure vessels, structural assemblies, and industrial machineryexposed to chlorides, seawater, and harsh chemical environments. These bolts are also employed in power generation, desalination plants, and specialized industrial equipment, providing secure, leak-free, and durable connections. Engineers rely on S31803 stud bolts whenever structural integrity, chemical durability, and long-term reliability are required, making them indispensable for demanding industrial applications.
