Duplex Steel Flanges

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Duplex Steel Flanges Manufacturer, Exporter and Supplier in Dubai, UAE

2205 Duplex Steel Flange Supplier in Dubai, Austenitic Duplex Steel 2205 WNRF Flanges Exporter, Duplex 2205 Industrial Flanges, ASTM A182 Duplex Steel 2205 RTJ Flange, Duplex 2205 Flat Flange, 2205 Flanges Traders, Stockholder in Dubai, UAE.

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Duplex steel flanges are fittings used in piping systems where duplex stainless steel is preferred for its excellent combination of corrosion resistance, strength, and durability. Duplex stainless steel is a family of stainless steels with a two-phase microstructure consisting of both austenitic and ferritic phases, providing superior properties to traditional stainless steels.

Duplex Steel Flanges Specifications

Specifications ASTM A182 / ASME SA182
Size 1/8″ NB TO 48″ NB
Standards ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Class / Pressure 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Standard ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Grades S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61

Duplex Steel Flanges Chemical Composition

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

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Duplex Steel Flanges Mechanical Properties

Grade S31803
Density (g/cm 3) 7.805
Density (lb/in 3) 0.285
Melting Point (°C) 1420 – 1465
Melting Point (°F) 2588 – 2669

Top Duplex Steel Flanges Manufacturing Company in Dubai

At PipingMart, we take pride in being the largest supplier and manufacturer in the UAE, offering cutting-edge solutions for all your piping needs. With state-of-the-art production plants strategically located in the UAE, we boast a vast inventory of over 25,000 tons of premium-quality materials readily available in stock.

Duplex Steel Flanges Steel Flanges

  • Duplex Steel Flanges 2205
  • Duplex Steel Flanges S32205
  • Duplex Steel Flanges S31803

Contact us to get a quick quote for your requirement.

We offer These Duplex Steel Flanges as per DIN, ISO, JIS or ANSI Standard.

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Advantages of Duplex Steel Flanges

  1. Corrosion Resistance: Duplex steel flanges offer superior corrosion resistance to conventional stainless steel, making them ideal for use in corrosive environments such as seawater and chemical processing plants.
  2. High Strength: Duplex steel flanges exhibit higher strength than austenitic stainless steels, allowing for thinner and lighter constructions while maintaining structural integrity.
  3. Excellent Toughness: They have excellent toughness and flexibility, providing resistance to impact and fatigue, which is particularly advantageous in high-pressure applications.
  4. Stress Corrosion Cracking Resistance: Duplex steel flanges demonstrate resistance to stress corrosion cracking, a common issue in chloride-rich environments, enhancing their reliability and longevity.
  5. Cost-Effective: Despite their superior properties, duplex steel flanges can save costs over other corrosion-resistant alloys due to their lower nickel content and competitive pricing.
  6. Good Weldability: Duplex steel flanges are readily weldable using common welding techniques, allowing for easy fabrication and installation while maintaining mechanical properties.

Types of Duplex Steel Flanges

slip-on flanges
Slip-On Flanges
Weld Neck Flanges
Blind Flanges
Threaded Flanges
Socket Weld Flanges
Lap Joint Flanges

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Duplex Steel Flanges Uses

Application Industry

Duplex steel flanges find widespread industrial applications across various sectors due to their exceptional combination of corrosion resistance, strength, and durability. Commonly utilized in industries such as oil and gas, chemical processing, marine, and offshore, these flanges play a crucial role in piping systems subjected to corrosive environments, high pressures, and extreme temperatures.

Oil & Gas Industry

Water Treatment

Chemical Processing

Pulp and Paper Industry

  1. Oil and Gas Industry: Duplex steel flanges are widely used in upstream, midstream, and downstream operations, including drilling rigs, pipelines, refineries, and petrochemical plants, where corrosion resistance and high strength are essential.
  2. Chemical Processing: They are employed in chemical processing plants for handling corrosive chemicals, acids, and solvents, ensuring reliable performance and longevity in aggressive environments.
  3. Marine Applications: Duplex steel flanges are utilized in shipbuilding, offshore platforms, and port facilities for seawater piping systems, where corrosion resistance and strength are critical.
  4. Water Treatment: Municipal and industrial water treatment facilities use duplex steel flanges in piping systems for handling treated water, chemicals, and wastewater, providing durability and reliability in harsh conditions.
  5. Pulp and Paper Industry: Duplex steel flanges are used in pulp and paper mills for corrosive chemical processing, including bleaching, pulping, and papermaking processes, where resistance to corrosion and erosion is vital.
  6. Renewable Energy: Wind farms, hydroelectric power plants, and solar energy facilities utilize duplex steel flanges in water intake and circulation systems, ensuring durability and performance in challenging environmental conditions.
  7. Mining Industry: Duplex steel flanges are employed in mining operations for transporting corrosive fluids such as acids, slurries, and tailings, offering resistance to abrasion, erosion, and corrosion.
  8. Food and Beverage Industry: Facilities processing and conveying food and beverage products utilize duplex steel flanges in piping systems, ensuring compliance with hygiene standards and resistance to corrosion in sanitary environments.
  9. Construction: Duplex steel flanges are used in construction projects for infrastructure, buildings, and bridges, where corrosion resistance and structural integrity are essential, particularly in coastal or industrial environments.
  10. Power Generation: Thermal power plants, nuclear power plants, and cogeneration facilities use duplex steel flanges in condensers, heat exchangers, and steam piping systems, where corrosion resistance, strength, and thermal stability are critical for efficient operation.

How to Choose the Right Duplex Steel Flanges

  1. Identify Application Requirements: Determine the operating conditions such as temperature, pressure, fluid characteristics (including corrosiveness and abrasiveness), and environmental factors (such as exposure to seawater or chemicals).
  2. Material Grade Selection: Select the appropriate duplex stainless steel grade based on the application requirements, considering corrosion resistance, strength, and temperature resistance. Common grades include UNS S31803 (2205), UNS S32205, and UNS S32750 (2507).
  3. Flange Type: Choose the suitable flange type based on the piping system requirements and installation method, such as weld neck, slip-on, socket weld, threaded, lap joint, blind, or spectacle blind flanges.
  4. Size and Dimensions: Ensure that the duplex steel flanges have the correct size, dimensions, and pressure ratings to match the piping system, including considerations such as pipe diameter, flange class, and face type (e.g., raised face or flat face).
  5. Corrosion Resistance: Verify that the duplex steel grade selected offers the required level of corrosion resistance for the specific application environment, considering factors such as chloride content, pH levels, and exposure to corrosive substances.
  6. Pressure and Temperature Ratings: Choose duplex steel flanges with suitable pressure and temperature ratings to withstand the maximum operating conditions of the piping system, including any potential pressure spikes or temperature fluctuations.
  7. Quality and Standards: Ensure that the duplex steel flanges meet relevant industry standards and specifications (e.g., ASTM, ASME, ANSI, DIN) to ensure quality, reliability, and compliance with regulatory requirements.
  8. Manufacturer Reputation: Select duplex steel flanges from reputable manufacturers known for producing high-quality products and providing reliable technical support, including material certifications and documentation.
  9. Budget Considerations: Consider the budget constraints while balancing the need for quality and performance to find the most cost-effective solution for your application without compromising safety or reliability.
  10. Consultation: If necessary, consult with engineers, metallurgists, or experts in piping systems to get recommendations and assistance in selecting the right duplex steel flanges for your specific requirements.

What maintenance is required for Duplex Steel Flanges?

Duplex steel flanges require minimal maintenance due to their corrosion resistance, but periodic inspections and cleaning may be necessary to ensure optimal performance and longevity.

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FAQ (Frequently Asked Questions)

Are Duplex Steel Flanges environmentally friendly?

Yes, duplex steel is a recyclable material, making duplex steel flanges environmentally friendly and contributing to sustainability efforts.

What types of Duplex Steel Flanges are available?

Common types of duplex steel flanges include weld neck, slip-on, socket weld, threaded, lap joint, blind, and spectacle blind flanges, each suitable for specific installation methods and conditions.

Are Duplex Steel Flanges weldable?

Yes, duplex steel flanges are readily weldable using common welding techniques, ensuring ease of fabrication and installation while maintaining mechanical properties.

Duplex Steel Flanges​ Size Chart

Nominal SizeOutside Diameter
Min. Thickness
RF Dia.
No. of Bolt HolesDiameter of HolesBolt Circle
SO Bore ID
WN Bore ID
Dia. Hub Base
Dia. of Hub Top

Other Flanges Material

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