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Duplex Steel UNS S31803 Bolts

Duplex Steel UNS S31803 Bolts

Duplex Steel UNS S31803 Bolts are constructed from austenitic-ferritic stainless steel developed to be stronger and more corrosion resistant than 300 series stainless steel. It aids users in avoiding stress corrosion cracking, which is very common with 316 and 317 stainless steel. Duplex steel UNS S31803 bolts are made from a mixture of austenitic and ferritic alloys. The mix of these alloys makes the grade extra strong and resistant to various chemical procedures 

Duplex Steel UNS S31803 has been tested at room temperature under reverse bending stress in comparison to SS316.

Duplex Steel UNS S31803 changes from ductile to brittle at -50 degrees celsius and can also become embrittled at 300-1000 degrees celsius. Thus a temperature range of -50 degrees celsius to 300 degrees celsius is suggested. The embrittlement of S31803 bolts is caused by exposure to temperatures exceeding 300 degrees celsius and a reduction in corrosion resistance.

Duplex Steel UNS S31803 Bolts provide an enhanced corrosion solution to stainless, with better sulfide corrosion resistance, chloride pitting resistance, and crevice corrosion resistance than 317L. Duplex Steel UNS S31803 Bolts are resistant to chloride pitting and crevice corrosion thanks to a mixture of chromium, molybdenum, and nitrogen, making them ideal for maritime conditions, closed-loop water systems and some food processing applications. It's crucial to remember that pitting corrosion can be a problem in chloride solutions when oxidizing media is present. In these conditions, the Duplex Steel UNS S31803 Bolts material's passive (protective) layer may be damaged, resulting in localized pitting.

Duplex Steel UNS S31803 Bolts are used on processing equipment, storage containers, and pipelines in the chemical industry. Duplex Steel UNS S31803 Bolts are used in digesters, bleaching equipment, stock-handling systems, and liquid tanks in the pulp and paper industry. Duplex Steel UNS S31803 Bolts are used in marine and oil & gas extraction and processing in chloride and hydrogen sulfide environments.

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Specification :-

Specifications ASTM F593, F594, F1554 / ASME SF593, F594, F1554
Standard DIN : DIN 934, DIN 931, DIN 970, DIN 933
ISO : JIS standards, ISO 4033, ISO 4032,
ANSI – American National Standards Institute
ASME B18.5
ANSI B 28.2.4 1M
as per defined in ASME B16.5 standard length
ANSI B 18.2.4 2M
as per defined in ASME B18.2.2
Size M3 - M56 | 3/6" to 2" | 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 2205 S31803 1.4462

Chemical Composition

Grade C Mn Si P S Cr Mo Ni N Fe
S31803 0.030 max 2.00 max 1.00 max 0.030 max 0.020 max 22.0 – 23.0 3.0 – 3.5 4.50 – 6.50 0.14 – 0.20 63.72 min

Mechanical Properties

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

Applications and Uses

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