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Brian Fasteners is a leading manufacturer and supplier of Duplex Steel Stud Bolts S31803, which it offers to clients in Houston and globally with corrosion-proof fastening solutions. S31803 duplex stainless steel offers a balanced microstructure of ferrite and austenite, providing high mechanical strength and excellent resistance to chloride stress corrosion cracking. These stud bolts are ideal for marine, offshore, and petrochemical applications. Manufactured in accordance with ASTM A182/A479, our S31803 stud bolts are precision-engineered for durability and safety in aggressive and high-pressure environments. Trust Brian Fasteners for reliable, long-lasting stud bolts tailored to industrial requirements.
Duplex Steel S31803 has around 21–23% chromium, 4.5–6.5% nickel, 2.5–3.5% molybdenum, and added nitrogen for improved strength. Dual-phase microstructure provides enhanced resistance against pitting, crevice corrosion, and stress corrosion cracking. S31803 stud bolts show tensile strength of 90–110 ksi and yield strength of 65 ksi with Rockwell hardness up to B100. Their mechanical stability and corrosion resistance are good in a wide range of temperatures, providing them with stability in cyclic pressure and corrosive service conditions.
| 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 S31803 Stud Bolts are extensively applied in chemical processing, petrochemical refineries, and desalination plants due to widespread exposure to chlorides and high pressure. They find applications for fastening heat exchangers, pressure vessels, and flanged pipe connections in offshore oil rigs and marine structures. They are also used in structural frameworks, storage tanks, and water treatment plants for corrosion resistance and strength. In pulp and paper applications, they withstand acidic and corrosive media. Their superior mechanical properties guarantee performance under thermal cycling and high-stress loading.
At Brian 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.
Brian Fasteners is a leading manufacturer and supplier of high-quality fasteners in Houston , USA, with over 8 years of experience serving global industries.
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