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The Duplex & Super Duplex Steel Nuts have great yield strength. This yield strength is two times that of the annealed yield strength of typical austenitic stainless steels. The chemical composition of Duplex steel consists of ferrous and nickel, along with chromium having an austenitic composition at room temperature. 

The Duplex & Super Duplex Steel Nuts are used in a wide range of applications. These include industries such as the chemical industry, power industry, and various other industries as well. The Duplex Steel UNS S31803 Nuts have great resistance towards corrosion and the damages that could occur because of corrosion. They also have good aqueous corrosion resistance. Duplex Steel UNS S32205 Nuts is very ductile. They also have good characteristics of being weldable. 

Duplex Steel UNS S31803 Nuts show good performance even at highly elevated temperatures. In this case these are comparatively better than the other austenitic stainless steel grades available. The Super Duplex Steel 32750 NUTS also have the characteristic of resisting corrosion and therefore are used in applications where corrosion might occur. These applications include industries such as marine applications and off the shore applications. 

The Super Duplex Steel 32760 NUTS has a chemical composition which consists of the elements such as chromium, nickel, molybdenum. Along with these there are also other elements such as copper and tungsten along with nitrogen present in its chemical composition. These are used in a wide range of industrial applications such as oil and gas applications, heat exchangers, etc.

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Specification :-

Grades Duplex Steel UNS S31803 / S32205
Super Duplex Steel 2507 (UNS S32750/S32760)
Standard ANSI – American National Standards Institute
  • UNS Stud Nuts length are defined in ASME B16.5 standard
  • ANSI B 28.2.4 1M
  • ANSI B 18.2.4 2M
  • ASME B18.5
  • Nuts are defined in ASME B18.2.2
  • DIN:DIN 933, DIN 931, DIN 970, DIN 934
  • DIN 580 UNS S31803 Eye Nuts
  • UTS – Unified Thread Standard : UNF, NPT, NPTF, UNS, UNC, UNEF
  • ISO – International Organization for Standardization ISO 4033, : ISO 4032, JIS standards
Size M10, M4, M16, M36 M2.5, M6, M30, M12, M8, M14, M2, M3, M20, M24, M5 to M160 | Custom Sizes
Length 3 mm to 200 mm | Custom Sizes
Dimensions DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3
Form Hex, Threading, Square, Round as per Gauge Etc.
Threads Unless otherwise specified, the threads shall be rolled or cut and tapped horizontally or
Threads available UNF, BSW, BSF, METRIC, UNC, or as required
ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Certification Dual Certified As per ASTM & ASME Codes
Test Certificate As per EN 10204 / 3.1 Manufacturer Test Certificate, PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified
Raw materials Source JSPL, Mukund Steel, Tata Steel, Dhamm Steel, Usha Martin,etc.
Packing IN BULK: canton, pallet, Small Boxs / carton / pallet, or customer request
Surface Coating Cadmium Coating
Hot Dipped Galvanizing Coating
Ptfe Coated
Phosphate Coating
Teflon Coating
Xylon Coating
Zinc Coating

Equivalent Grades

Duplex S31803 S31803 1.4462
Duplex S32205 S32205 1.4462
Super Duplex S32750 S32750 1.4410
Super Duplex S32760 S32760 1.4410

Chemical Composition

Grade C N P Si Mn Mo Fe Cr S Ni
S31803 / S32205 1.0 max 0.03 max 0.02 max 2.0 max 3.0 – 3.5 22.0 – 23.0 0.03 max 4.5 – 6.5 0.14 – 0.2 Bal
S32750 / S32760 0.030 max 0.24 - 0.32 0.035 max 0.80 max 1.20 ma 3.0 – 5.0 - 24.0 – 26.0 0.020 max 6.00 - 8.00

Mechanical Properties

Grade Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
S31803 / S32205 7.8 g/cm3 1350 °C (2460 °F) Psi – 80000 , MPa – 550 Psi – 116000 , MPa – 800 15 %
S32750 / S32760 7.8 g/cm3 1350 °C (2460 °F) Psi – 80000 , MPa – 550 Psi – 116000 , MPa – 800 15 %

Applications and Uses

  • Chemical Industries
  • Oil & Gas Industrires
  • Power Plant Industries
  • Shipbuilding Industries
  • Fertilizer Industrires
  • Petrochemical Industrires
  • Sugar Industrires
  • Cement Industrires