Home > Duplex Steel > Duplex Steel Nuts
Sayam Nickel Alloys is a trusted manufacturer and supplier of Duplex Steel Nuts in Hyderabad, offering high-strength fastening solutions for corrosive and high-pressure industrial environments. Manufactured using premium-grade raw materials and advanced machining processes, these nuts ensure precise threading, excellent load-bearing capacity, and long service life. Sayam Nickel Alloys follows stringent quality control measures and international standards to deliver consistent and reliable products. Their duplex steel nuts are widely used in critical applications where strength, corrosion resistance, and safety are essential.
|
Material |
Specification |
Standards |
Size
|
Length |
|
Duplex Steel
|
IS
BS
ASTM
|
ASTM / ASME – A/ SA 479 / 479 |
3 mm
to
200 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 Nuts are made from alloys with a balanced austenitic and ferritic microstructure. The composition typically 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, duplex steel nuts offer high yield strength, excellent tensile strength, and good toughness. They maintain structural stability under high pressure, fluctuating loads, and moderate-to-high temperature conditions.
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Duplex Steel Nuts are widely used with bolts and studs in industries requiring secure fastening in aggressive environments. Common applications include oil and gas installations, petrochemical plants, chemical processing equipment, marine structures, offshore platforms, and power generation units. They are also used in desalination plants, pressure vessels, pipelines, and heat exchangers. Due to their excellent resistance to chlorides and harsh chemicals, duplex steel nuts are ideal for flanges, valves, pumps, and structural assemblies where durability and safety are critical.
