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Punit Fasteners is a leading supplier and manufacturer of Duplex Steel Stud Bolts S31803 in Delhi, India. These stud bolts are made from UNS S31803 duplex stainless steel, offering high tensile strength, excellent fatigue resistance, and great protection against corrosion. Manufactured according to ASTM A182 and A479 standards, our S31803 stud bolts are suitable for critical bolting applications in challenging environments. Available in double-end and fully threaded types, these bolts are widely used in the marine, petrochemical, and power generation sectors. Punit Fasteners guarantees high quality, precise threading, and strong performance for high-pressure industrial fastening.
Duplex Steel S31803 Stud Bolts contain about 22% chromium, 5% nickel, 3% molybdenum, and nitrogen, creating a dual-phase microstructure of ferrite and austenite. This composition provides a tensile strength of 620–880 MPa, yield strength of 450–550 MPa, and hardness between 25–35 HRC. The bolts resist corrosion from chlorides, pitting, and crevice attacks. They show outstanding fatigue strength, weldability, and size stability under changing thermal and mechanical stress. These properties make S31803 stud bolts suitable for tough environments that demand high strength and corrosion resistance.
| 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.
S31803 Duplex Steel Stud Bolts are commonly used in marine platforms, chemical tanks, desalination units, and pulp and paper mills. They secure pressure vessels, pipelines, valves, and flanges faced with corrosive agents like chlorides, acids, and seawater. Their great strength and durability also make them suitable for bridges, structural frames, and offshore drilling rigs. In dynamic environments with vibration and temperature changes, these stud bolts provide secure fastening that resists fatigue. S31803 bolts are a reliable choice for industries that require strength, stability, and protection against harsh operating conditions.
At Punit 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.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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