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Punit Fasteners is a recognized manufacturer and supplier of Duplex Steel Stud Bolts in Delhi, India. Our duplex stud bolts are designed for high-strength applications requiring outstanding corrosion resistance, especially in chloride-rich and high-pressure areas. Made from duplex stainless steel (such as UNS S31803 or S32205), these bolts provide the advantages of both austenitic and ferritic steels. We offer fully threaded and double-ended stud bolts, following ASTM, DIN, and ISO standards. Punit Fasteners is dedicated to providing quality, precision, and durability, making our Duplex Steel Stud Bolts suitable for critical applications in offshore, petrochemical, and marine settings.
Duplex Steel Stud Bolts consist of about 22–25% chromium, 4–7% nickel, 3–5% molybdenum, and nitrogen. This dual-phase alloy structure provides a tensile strength of 620–880 MPa and a yield strength of 450–550 MPa. These bolts have excellent resistance to stress corrosion cracking, pitting, and crevice corrosion in acidic and saline settings. With a hardness typically between 25–35 HRC, they are suitable for high-load and high-temperature applications. The material’s high weldability and low thermal expansion contribute to its strength, making it durable for industrial bolting.
| Duplex Steel Stud Bolts | 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 |
| Duplex Steel Stud Bolts | 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 / S32205 |
| 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 are used extensively in the oil and gas, marine, power generation, and desalination sectors. They are ideal for flange connections, heat exchangers, and piping systems where top corrosion resistance and strength are essential. Offshore platforms and refineries use them to secure components exposed to harsh weather and chloride conditions. These bolts also find application in wastewater treatment plants and chemical reactors where durability against aggressive chemicals is critical. Their high mechanical properties and strong fatigue resistance make them suitable for key bolted joints in structural and high-pressure systems.
At Punit Fasteners, we ensure Duplex Steel Stud Bolts are packaged with the utmost care to preserve their quality and integrity. Each bolt is individually inspected and securely wrapped in protective materials to prevent damage during transit. We offer a range of packaging options, including bulk cartons and custom-sized containers, to meet your specific needs. Our robust packaging solutions ensure that your fasteners arrive in pristine condition, ready for immediate use in your critical applications.
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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