Home > Duplex Steel > Duplex Steel S31803 Nuts
Sayam Nickel Alloys is a reliable manufacturer and supplier of Duplex Steel S31803 Nuts in Hyderabad, offering high-performance fastening solutions for demanding industrial environments. Manufactured using premium-quality raw materials and advanced machining processes, these nuts provide excellent dimensional accuracy, strength, and corrosion resistance. Sayam Nickel Alloys follows strict quality control procedures and international standards to ensure consistent product quality. Their Duplex Steel S31803 nuts are widely trusted in critical applications where durability, safety, and long-term reliability are essential
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Material
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Specification
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Standards |
Size
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Length
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Duplex Steel S31803 |
IS BS ASTM |
ASTM / ASME – A/ SA 479 / 479
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3 mm |
M02 to M30 |
| Cr | N | Ni | C | Mn | Si | P | S | Mo | |
|---|---|---|---|---|---|---|---|---|---|
| S31803 | min: 21.0 max: 23.0 | min: 0.08 max: 0.20 | min: 4.5 max: 6.5 | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 2.5 max: 3.5 |
| S32205 | min: 22.0 max: 23.0 | min: 0.14 max: 0.20 | min: 4.5 max: 6.5 | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 3.0 max: 3.5 |
Grade | Tensile Strength (MPa) min | Elongation (% in 50mm) | Yield Strength 0.2% Proof (MPa) min | Hardness Rockwell C (HR C) |
|---|---|---|---|---|
UNS-S 31803 | 650-880 | 25 | 448 | |
UNS-S 32205 | 621 | 25 | 448 | 21 max |
Duplex Steel S31803 Nuts are made from a balanced alloy of austenitic and ferritic stainless steel. The composition includes chromium, nickel, molybdenum, and nitrogen, which enhance corrosion resistance and mechanical strength. High chromium and molybdenum content provide excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. Mechanically, these nuts offer high yield strength, superior tensile strength, and good toughness. They perform reliably under high pressure, cyclic loading, and moderate-to-high temperature conditions.
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Duplex Steel S31803 Nuts are widely used in industries requiring strong and corrosion-resistant fastening solutions. Common applications include oil and gas facilities, petrochemical plants, chemical processing equipment, marine systems, and offshore platforms. They are also used in pressure vessels, pipelines, heat exchangers, and desalination plants. Due to their excellent resistance to chloride-induced corrosion and harsh operating environments, these nuts are ideal for flanged joints, valves, pumps, and structural assemblies requiring secure and long-lasting fastening.
