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Punit Fasteners is a well-known manufacturer and supplier of Duplex Steel Fasteners S31803 in Delhi, India. Made from UNS S31803 duplex stainless steel, these fasteners offer strong resistance to chloride stress corrosion, erosion, and fatigue. With a mixed structure of austenite and ferrite, S31803 fasteners provide great strength and corrosion resistance. Made to meet ASTM A479/A182 standards, our range includes bolts, nuts, screws, washers, and threaded rods. Designed for tough conditions, these fasteners provide reliability in chemical processing, marine structures, and oil and gas operations. Punit Fasteners ensures durability, precise dimensions, and quality in every product.
Duplex Steel S31803 Fasteners contain 21–23% chromium, 4.5–6.5% nickel, 2.5–3.5% molybdenum, and nitrogen. Their dual-phase structure provides a tensile strength of 600–800 MPa and yield strength above 400 MPa. With Rockwell hardness around 25–30 HRC, these fasteners show great resistance to pitting and crevice corrosion. They also offer good weldability, high fatigue strength, and stability under thermal stress. The balanced composition ensures toughness and ductility, even at low temperatures, making them suitable for dynamic and corrosive situations where regular stainless steels fail.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| Duplex Steel S31803 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Duplex Steel S31803 | 7.9 g/cm3 | 1402 °C (2555 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 40 % |
Standard : DIN, ASTM, BS and all International Standards
Size : 3 mm to 200 mm
Bolt / Screw Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Nuts Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Washers Size : M1 – M64 | #4 to 3″ | Custom Sizes
Length : M02 to M33
Types : Nuts, Bolts, Screws, Sockets, Studs, Screw, Hex Set Screw, Socket Screw, Cap Screw, Pan Head Screw, Machine Screw, Socket Head Cap Screw, Allen Cap screw, Wing Screw
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 Fasteners are used in oil refineries, seawater piping, and supporting structures for bridges and platforms. Their corrosion resistance makes them perfect for flanges, valves, and pumps in brine, acid, and high-salinity uses. These fasteners are commonly found in paper mills, power plants, and marine components that face mechanical stress and corrosive elements. Their strength makes them ideal for offshore rigs and structural frameworks. S31803 fasteners provide long-lasting, strong fastening solutions for industries that require excellent resistance to wear, vibration, and chemical damage in highly corrosive or high-pressure settings.
At Punit Fasteners, we ensure that our Duplex Steel Fasteners S31803 are meticulously packaged to guarantee their integrity and quality upon delivery. Each fastener is carefully inspected and securely packed using high-quality materials to prevent damage during transit. Our packaging process includes labeling with detailed product information for easy identification. Whether you need bulk packaging or customized solutions, we prioritize your requirements, ensuring that your fasteners arrive in perfect 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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