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The Mumbai, India-based Fasteners Mart is a reputable name in high-performance industrial fasteners manufacturing and supply. One of its specialized products is Duplex Steel Washers S31803, which are renowned for their superior strength and corrosion resistance. These washers, usually round or flat in shape, are produced using Duplex Stainless Steel UNS S31803, a ferritic-austenitic alloy meant to provide enhanced mechanical and anti-corrosive properties. Compliant with global quality standards, these washers are best suited for use in extreme environments such as marine, chemical, and structural industries.
Duplex Steel S31803 Washers consist of around 21–23% chromium, 4.5–6.5% nickel, 2.5–3.5% molybdenum, and small traces of nitrogen and manganese. With this optimum proportion, superior pitting resistance, crevice corrosion resistance, and stress-corrosion cracking resistance are assured. S31803 is mechanically superior with a high tensile strength of around 620 MPa and yield strength of around 450 MPa, besides satisfactory impact toughness. Physically, the alloy provides good thermal stability and hardness, making such washers perfect for high-pressure and high-temperature applications in harsh industrial environments.
| 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 extensively employed in offshore structures, marine systems, chemical processing vessels, and structural components. They ensure fine load distribution and protection against assembly surface damage. Alternative uses of the washers include water treatment plants, heat exchangers, storage tanks, and pulp and paper sectors. Because of their high corrosion resistance, particularly in chloride-containing environments, and better strength-to-weight ratio, these washers are appropriate for application in extremely demanding industrial systems where reliability and durability are of utmost importance.
The Fasteners Mart provides prompt and secure delivery of Duplex Steel S31803 Washers within the domestic as well as international market. Items are properly packed in moisture-proof HDPE bags, bubble wrap, or wooden boxes with anti-corrosive lining. Each shipment is properly marked with grade, size, and heat number for easy identification and complete traceability while in transit and storage.
The Fasteners Mart is a leading manufacturer and supplier of high-quality fasteners in Mumbai, India, with over 8 years of experience serving global industries.
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