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Lina Fasteners is a well-respected manufacturer and supplier based in Tunis, Tunisia, specializing in high-quality Duplex Steel Stud Bolts S31803 designed for tough industrial applications. The company has built a solid reputation thanks to its cutting-edge manufacturing processes, rigorous quality control, and commitment to international standards. The Duplex Steel S31803 stud bolts from Lina Fasteners are known for their impressive strength, durability, and resistance to corrosion, making them a reliable choice for harsh environments. With a strong emphasis on precision, timely delivery, and customer satisfaction, Lina Fasteners caters to industries that need trustworthy fastening solutions for critical and high-pressure tasks.
Duplex Steel S31803 boasts a well-balanced austenitic-ferritic microstructure, typically comprising around 21–23% chromium, 4.5–6.5% nickel, 2.5–3.5% molybdenum, and a controlled amount of nitrogen. This alloy is known for its high yield and tensile strength, good ductility, and excellent fatigue resistance. In terms of mechanics, S31803 stud bolts provide about double the strength of standard austenitic stainless steels while still maintaining good toughness. They also show remarkable resistance to pitting, crevice corrosion, and stress corrosion cracking.
| 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 % |
| 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 |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
Duplex Steel Stud Bolts S31803 find extensive use in industries where high strength and corrosion resistance are crucial. Common applications include oil and gas, petrochemical plants, chemical processing units, offshore platforms, marine equipment, and power generation facilities. These stud bolts are perfect for pressure vessels, heat exchangers, flanges, and piping systems that are exposed to chloride-rich or corrosive environments. Their ability to handle heavy loads and withstand aggressive conditions ensures long-term reliability, safety, and reduced maintenance in essential industrial assemblies.
At Lina Fasteners, Duplex Steel Stud Bolts S31803 are meticulously packaged to ensure safe and secure delivery. Each bolt is individually inspected and wrapped in protective material to prevent damage during transit. We use durable, high-quality packaging materials that safeguard against environmental factors such as moisture and impact. The bolts are organized in sturdy, labeled cartons for easy identification and handling. Our packaging process guarantees that your Duplex Steel Stud Bolts S31803 arrive in pristine condition, ready for immediate use.
Lina Fasteners is a leading manufacturer and supplier of high-quality fasteners in Tunis, Tunisia, with over 8 years of experience serving global industries.
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