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Duplex Steel Washers S31803 are robust, corrosion-resistant fasteners crafted for tough industrial, marine, and chemical settings. Made from Duplex 2205 (S31803) stainless steel, these washers blend the strength of ferritic steel with the corrosion resistance of austenitic steel, guaranteeing durability and long-lasting performance. Suppliers in Hamilton, New Zealand, like Aria Fasteners, ensure that these washers come with precise dimensions, consistent thickness, and rigorous quality control. They’re perfect for distributing loads, preventing surface damage, and boosting the performance of bolts, nuts, and studs in applications that demand high mechanical strength and resistance to chloride-induced corrosion.
These washers are made up of iron, chromium, nickel, and molybdenum, which gives them outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. On a mechanical level, they provide toughness, dimensional stability, and effective load distribution even under heavy clamping forces. Thanks to their duplex microstructure, they resist deformation, stress, and corrosion in harsh industrial, offshore, and marine environments. This means they help maintain the integrity of bolted joints and protect mating surfaces while supporting the mechanical performance of fasteners in challenging conditions.
| 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 % |
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Duplex Steel S31803 washers are used in applications where high strength and excellent corrosion resistance are required. They are ideal for marine environments, chemical processing, and oil and gas industries. These washers perform well in high-pressure and high-temperature settings, such as in heat exchangers, reactors, and pipelines. Their resistance to stress-corrosion cracking and pitting ensures durability and reliability, making them suitable for demanding industrial conditions where both mechanical performance and resistance to harsh environments are crucial.
Duplex Steel Washers S31803 find their place in chemical processing plants, offshore platforms, desalination systems, power generation facilities, and marine installations. They’re particularly suited for use with flanges, pipelines, pressure vessels, and industrial machinery that face aggressive chemicals or chloride-rich environments. These washers enhance joint stability, prevent loosening, and extend the lifespan of bolted assemblies. Additionally, Duplex Steel Washers S31803 are utilized in heavy industrial manufacturing and infrastructure projects, offering reliable, durable, and corrosion-resistant solutions.
Aria Fasteners is a leading manufacturer and supplier of high-quality fasteners in Hamilton, New Zealand, with over 8 years of experience serving global industries.
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