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Seawater Desalination Super Duplex 2507 Weld Neck Flanges custom

Seawater Desalination Super Duplex 2507 Weld Neck Flanges Manufacturers

-- Steady & Reliable Manufacturer --

High-Performance Super Duplex Flange Solutions

In the high-chloride environments of modern seawater desalination plants, standard stainless steel often fails due to pitting and stress corrosion cracking. Our Super Duplex 2507 (UNS S32750) Weld Neck Flanges are specifically engineered to solve these challenges. This dual-phase steel provides an exceptional PREN (Pitting Resistance Equivalent Number) of over 42, making it virtually immune to localized corrosion in salt water. As a specialized manufacturer, we precision-forge these flanges with a tapered hub that provides structural reinforcement at the weld joint, ensuring high-pressure integrity for reverse osmosis (RO) systems. Each flange is solution annealed to ensure a balanced 50/50 austenite-ferrite microstructure, providing double the mechanical strength of 316L while maintaining excellent weldability.

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Technical Specifications Table

ParameterDetails
Material GradeASTM A182 F53 / UNS S32750
StandardsASME B16.5, MSS SP-44, EN 1092-1
Pressure ClassesClass 150 to Class 2500
PREN Value≥ 42.5
Size Range1/2" to 48" (DN15 - DN1200)
Face FinishRaised Face (RF), Ring Type Joint (RTJ)

Desalination & Offshore Applications

These Super Duplex flanges are the primary choice for high-pressure pump discharge lines and membrane housing manifolds in seawater reverse osmosis (SWRO) plants. They are also extensively used in offshore oil and gas platforms for firewater systems, cooling water headers, and subsea manifold components. In the chemical industry, 2507 flanges are utilized in phosphoric acid production and organic acid processing where aggressive halides are present. Their high fatigue strength and resistance to erosion-corrosion make them ideal for high-velocity fluid transport systems. Furthermore, they are commonly found in flue gas desulphurization (FGD) scrubbers and marine exhaust gas cleaning systems (EGCS), providing long-term reliability where standard alloys would require frequent replacement.

Superior Material Advantages

  • Extreme Corrosion Resistance: Superior resistance to chloride pitting, crevice corrosion, and stress corrosion cracking (SCC).
  • Enhanced Strength: Yield strength is twice that of austenitic stainless steels, allowing for weight reduction in high-pressure designs.
  • Erosion Protection: High hardness and fatigue resistance make it suitable for abrasive or high-turbulence flows.
  • Economic Longevity: While the initial cost is higher, the extended service life significantly lowers the total lifecycle cost in marine environments.

Trade & Logistics Support

We support payments via T/T, Irrevocable L/C at sight, and trade insurance for new international partners. Given the high value of Super Duplex alloys, each flange is individually wrapped in protective plastic and shipped in reinforced, fumigation-free wooden crates. We provide comprehensive documentation including 3.1 Mill Test Certificates, PMI (Positive Material Identification) reports, and corrosion testing results (ASTM G48). We offer worldwide shipping via air for urgent project repairs and sea freight for major desalination infrastructure. Our logistics team is experienced in handling complex customs requirements for high-alloy exports to ensure timely site delivery.

  • Q: Why use 2507 instead of 2205 for desalination?
  • A: While 2205 is excellent, Super Duplex 2507 has higher chromium, molybdenum, and nitrogen content, providing the necessary protection against the extreme chloride concentrations found in concentrated brine systems.
  • Q: Does 2507 require special welding procedures?
  • A: Yes, it requires controlled heat input and specific filler metals to maintain the 50/50 phase balance; we provide technical guidance on welding with every order.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As Seawater Desalination Super Duplex 2507 Weld Neck Flanges Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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