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Duplex S31803 Flanges Fittings

Duplex Steel UNS S31803 Flanges are widely used in industries where high strength and superior corrosion resistance are required. These flanges combine the benefits of ferritic and austenitic stainless steel, making them suitable for seawater systems, LNG plants, desalination, mining, and nuclear power operations. Available in various types such as blind, slip-on, threaded, and weld neck, these flanges are manufactured in compliance with ASTM A182 and ASME SA182 standards. Their balanced microstructure provides durability against pitting and stress corrosion cracking. Custom dimensions and finishes are also available to meet specific project requirements across global industries.

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UNS S31803 Duplex Steel Flanges are engineered to deliver exceptional mechanical strength and resistance to aggressive environments. They are commonly used in petrochemical plants, offshore platforms, and power generation systems. The range includes weld neck, slip-on, blind, lap joint, and threaded flanges, each designed to ensure leak-proof pipeline connections. Manufactured under ASTM A182 specifications, these flanges perform reliably in both high-pressure and corrosive conditions. Duplex Steel 1.4462 flanges are not recommended above 300°C or below –50°C due to phase transition properties. Clients can choose customized sizes, facing types, and surface finishes to suit their industrial applications.
Duplex Steel UNS S31803 Forged Flanges provide outstanding toughness, weldability, and resistance to chloride stress corrosion cracking. They are ideal for desalination plants, seawater piping, biomass systems, and chemical processing industries. Available types include RTJ, orifice, reducing, and long weld neck flanges. Manufactured as per ASTM A182 / ASME SA182 standards, they offer superior durability even in harsh operating conditions. Their duplex microstructure provides double the strength of standard austenitic stainless steel, making them an economical choice for high-performance pipelines. With custom manufacturing, clients can order specific dimensions, pressure ratings, and surface finishes as per their project needs.
Duplex Steel UNS S31803 Flanges are designed for critical industries where both strength and corrosion resistance are essential. They are commonly used in LNG, desalination, oil & gas, and renewable energy projects. The product range includes blind, socket weld, plate, groove & tongue, and ring-type joint flanges. These flanges adhere to ASTM A182 standards, ensuring international quality compliance. Their dual-phase structure enhances fatigue strength and resists localized corrosion such as pitting and crevice corrosion. Not suitable for extreme temperatures, these flanges work best in moderate-to-high-pressure systems. Customized designs, sizes, and facing types are available for diverse industrial applications.

Cupro Nickel 90/10 Key Properties

  • Excellent resistance to seawater corrosion.
  • High durability in marine environments.
  • Suitable for desalination, chemical, and marine applications
  • Mechanical Strength – High tensile strength with good ductility and fatigue resistance.
  • Manufactured as per ASTM, ASME, and DIN standards
  • Size Range – Offered in M3 to M72 diameters, with custom sizes available.
  • Widely used in shipbuilding and desalination plants.

Cupro Nickel 90/10 Flanges – Key Features

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Duplex S31803 Flanges Fittings

Specialist of Manufacturing Duplex Steel Groove & Tongue Flanges, Long Weld Neck Flanges Stockist, Duplex Steel Socket Weld Flanges.


Duplex Steel S31803 Flange Fittings Specification

Grades    :  Duplex Steel – UNS NO. S31803
 

Standards:  ASTM / ASME / ANSI Flanges, DIN Flanges, EN Flanges, BS Flanges etc.


Specifications:  ASTM / ASME SB 564 / 160 / 472

 

Dimension:   ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings

Size:  1/2″ NB – 60″NB

Class& LBS:  150#, 300#, 600#, 900#, 1500#, 2500#, DIN ND PN6, PN10, PN16, PN25,PN40and Other Drawing type Etc.

Schedule:  Sch. 5 TO Sch. XXS.

Type:  Slip On (SORF), WNRF, Blind, Socket Weld, Orifice, WNRTJ, BLRTJ, Threaded, Groove & Tongue, Lap Joint, Square Flanges & As Per Clients Required.

Flanges Face Type:  Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ).


Our Duplex Steel S31803 Flanges Fittings conforms to NACE MR0175/ISO 15156.

 

ASTM B61 Cupro Nickel 90/10 Flanges Equivalent Grades:-

Standard WERKSTOFF NR. UNS MIL SAE JIS BS EN
Cu-Ni 90/10 2.0872 C70600 C-15726 J461, J463 - CN-10-2 CW-35-2H

ASTM B61 Cupro Nickel 90/10 Flanges Chemical Composition:-

Grade Cu Ni Pb Mn Fe Zn P S N
Cu-Ni 90/10 88.6 Min. 9.0 - 11.0 0.05 max 1.0 max 1.8 max 1.0 max - - -

ASTM B61 Cupro Nickel 90/10 Flanges Mechanical Properties :-

Density Melting Point Tensile Strength Yield Strength (0.2% offset) Elongation
0.323 lb/in³ at 68 °F 2100 °F 50,000 psi – 38 ksi 20,000 psi – 15 ksi 30 %

Duplex Steel Industrial Flanges

Duplex Steel UNS S31803 Flanges are manufactured to provide exceptional service in demanding environments. They are widely utilized in chemical, petrochemical, oil & gas, marine, and power industries. These flanges include weld neck, lap joint, blind, and socket weld types, all designed for secure and durable piping connections. Their composition ensures resistance to chloride stress cracking and general corrosion, making them highly reliable in seawater and chemical media. Produced under ASTM A182 and DIN 1.4462 standards, these flanges are available in multiple pressure classes and facing options. Clients can also request customized dimensions and surface finishes to suit project needs.

Types of Duplex Steel S31803 Flanges Fittings

A182 Duplex Steel UNS S31803 Screwed Flanges ASTM A 182 Duplex Steel UNS S31803 Blind Flanges
ASME SA 182 UNS S31803 Reducing Flanges in Tanzania Duplex Steel DIN 1.4462 Plate Flanges in Nigeria
Duplex Steel S31803 Lap joint Flanges Stockiest in Peru Duplex Steel 31803 ANSI standard Flange Stockholder
Duplex Steel S31803 Slip on Flanges in Madagascar UNS S31803 Din Standard Flanges Exporter in Libya
Duplex Steel UNS S31803 Raised face Flanges Duplex Steel UNS S31803 Flanges Supplier in Chile
Duplex Steel UNS S31803 Welding Neck Flanges Duplex Steel UNS S31803 Industrial Flanges in Africa
Duplex Steel UNS S31803 SORF Flanges in Ethiopia Duplex Steel S31803 A182 Ring Type Joint Flanges
Duplex Steel S31803 Pipe Flanges Dealer in Brazil Duplex Steel UNS S31803 Square Flange Manufacturer
Duplex Steel UNS S31803 Forged Flanges in Algeria ANSI B16.5 UNS S31803 Flat Flanges Exporter
UNS S31803 ASTM A182 Spectacle Flanges in South Africa Duplex Steel UNS S31803 BLRF Flanges in Egypt
Duplex Steel S31803 Socket Weld Flanges in Zambia Duplex Steel S31803 Orifice Flanges Dealer in Ghana

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