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Punit Fasteners is a reliable manufacturer and supplier of Duplex Steel S31803 Washers in Delhi, India. These washers are made from high-strength duplex stainless steel, UNS S31803, known for excellent resistance to corrosion, stress cracking, and fatigue. Designed to distribute loads and prevent damage to assembled parts, our washers meet ASTM A240/A479 standards. Available in flat, spring, and custom forms, they are suitable for high-pressure and corrosive applications. Punit Fasteners guarantees consistent performance, accuracy in dimensions, and long-lasting reliability in tough industrial environments like marine, chemical, and oil and gas sectors.
S31803 Duplex Steel Washers contain around 21–23% chromium, 4.5–6.5% nickel, 2.5–3.5% molybdenum, and nitrogen. This alloy provides a tensile strength of 600–800 MPa and yield strength of 400–550 MPa, with a hardness of about 25–30 HRC. The dual-phase structure ensures excellent resistance to corrosion, especially against chloride-induced pitting and stress corrosion cracking. These washers maintain their mechanical stability under thermal cycling and high mechanical loads. Their high fatigue strength and flexibility make them suitable for dynamic or vibrating systems that require secure and corrosion-resistant load distribution.
| 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 | Star Washer, Flat Washer, Lock Washer, Slot Washer, Machine Washer, Sealing Washer, Split Washer, Dome Tooth Washer, Countersunk Washer, Tab Washers, Spherical Washer, Square Washer, Spring Washer, Round Washers, Square Washers etc |
| S31803 / S32205 | 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 / S32205 | 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 % |
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 Washers are found in oil and gas facilities, marine construction, chemical processing, and desalination plants. They effectively distribute loads in bolted joints, heat exchangers, valves, and pumps that face high pressure or corrosion. Their resistance to aggressive chemicals and seawater makes them perfect for subsea and offshore applications. These washers are also used in the pulp and paper industry, wastewater treatment, and structural engineering for bridges and frameworks. They enhance joint stability, reduce wear, and improve safety in dynamic, high-stress, and corrosive conditions.
At Punit Fasteners, we prioritize the safety and quality of our Duplex Steel S31803 washers during delivery. Each washer is thoroughly inspected and individually wrapped in protective packaging to prevent damage. They are then placed in tightly labeled boxes with product details and detailed quantities. Our packaging is designed to protect the environment and physical impact, ensuring that your high-performance washer arrives in prime condition and 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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