Home > Duplex Steel > Duplex Steel S31803 Nuts
At Nasir Nickel Alloys in Manama, Bahrain, Duplex Steel S31803 Nuts are manufactured to deliver exceptional strength, corrosion resistance, and reliability in demanding industrial conditions. Crafted from a duplex stainless steel alloy, these nuts combine the toughness of ferritic steel with the ductility of austenitic steel, offering high tensile strength and excellent resistance to stress-corrosion cracking. Designed for critical fastening applications, Duplex Steel S31803 Nuts maintain structural integrity and dimensional stability under high-pressure, corrosive, and elevated-temperature environments. Their durability ensures long-term performance in chemical, petrochemical, offshore, and marine industries where reliability is essential.
Duplex Steel S31803 Nuts consist of approximately 22% chromium, 5-6% nickel, 3% molybdenum, and a balanced mixture of austenite and ferrite phases. This combination provides high tensile and yield strength while retaining toughness and ductility. The alloy offers excellent resistance to pitting, crevice corrosion, and chloride-induced stress-corrosion cracking. Duplex Steel S31803 Nuts maintain dimensional stability under thermal cycling and mechanical stress, ensuring reliable fastening. Their unique balance of corrosion resistance and mechanical strength makes them ideal for critical applications in harsh chemical, offshore, and high-pressure environments.
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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 |
At Nasir Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel S31803 Nuts in Manama, Bahrain, providing cutting-edge solutions for all your piping needs. Our state-of-the-art production plants are strategically located in the Bahrain, allowing us to maintain a vast inventory of over 16,000 tons of premium-quality materials readily available in stock. We are dedicated to delivering superior products and services, ensuring reliability and excellence for our global clientele.
Contact us to get a quick quote for your requirement.
Duplex Steel S31803 Nuts are widely used in industries that require high strength and corrosion resistance. They are essential for chemical processing plants, including reactors, heat exchangers, and piping systems exposed to aggressive chemicals and chlorides. Power generation facilities utilize them in boilers, turbines, and high-pressure piping assemblies. Offshore and marine industries benefit from their resistance to seawater and chloride-induced corrosion. Petrochemical and refinery operations employ these nuts in valves, pumps, and structural assemblies. Duplex Steel S31803 Nuts provide secure, long-lasting fastening solutions for critical systems operating under high stress, corrosive environments, and elevated temperatures.
