SS / Duplex & Super Duplex Weld Neck Flange
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SS / Duplex and Super Duplex Weld Neck Flange
For applications where absolute reliability is non-negotiable, EBY Fasteners delivers superior SS / Duplex and Super Duplex Weld Neck Flanges. These flanges offer superior strength, leak-proof integrity, and outstanding corrosion resistance, making them essential in demanding industries like chemical processing, oil & gas, and offshore operations
Our stainless steel (SS) weld neck flanges provide a robust welded connection and excellent resistance to a wide range of corrosive substances. Upgrade to Duplex and Super Duplex Weld Neck Flanges when you need extreme performance. Duplex flanges offer exceptional resistance to chloride stress cracking, ensuring long-term durability in harsh environments. For ultimate protection, Super Duplex flanges are engineered to withstand pitting, crevice corrosion, and general corrosion in the most severe conditions
EBY Fasteners is your trusted partner for ensuring the safe and reliable operation of your critical systems. We stock a vast selection of SS / Duplex and Super Duplex Weld Neck Flanges in various sizes and specifications to meet your exact requirements
EBY Fasteners is your trusted partner for ensuring the safe and reliable operation of your critical systems. We stock a vast selection of SS / Duplex and Super Duplex Weld Neck Flanges in various sizes and specifications to meet your exact requirements
- ASTM / ASME A/SA 182 : This foundational standard is indispensable for the manufacturing of stainless steel flanges, fittings, valves, and other components. It's your guarantee of quality as it sets rigorous guidelines for the material's chemistry, how strong and tough it needs to be, and the testing procedures it must pass.
- F51 & F60 : These are the classic Duplex grades, packing a one-two punch of strength and corrosion resistance. F60 is a slightly refined version of F51, better at resisting pitting and crevice corrosion – those sneaky types that hide in cracks and ruin your day. They're often used interchangeably.
- F53 & F55 : Think of these Super Duplex grades as the heavyweights. They have extra levels of chromium and molybdenum, making them nearly invincible against seawater, harsh chemicals, and environments that would eat lesser stainless steels alive.
- F61 : Also in the Super Duplex category, boasting top-notch strength and resistance to a whole range of corrosion attacks, ideal for when failure isn't an option
- Design Standards (ASME, ANSI, JIS, etc.) : These flanges are designed in adherence to a variety of meticulous standards, including ASME B16.5 and B16.47 (for different diameter ranges), ANSI, JIS, DIN, and more. Adherence to standards ensures compatibility with piping systems, predictable performance, and quality control across manufacturers.
- Material Grades (ASTM A182, A995, A240) : Duplex and Super Duplex flanges are made from specialized stainless steel alloys precisely defined in standards like ASTM A182 and its counterparts. Popular Duplex grades include F51, F53, and F55. Super Duplex options include CE8MN, CD4MCuN, and CD3MWCuN, alongside standard UNS S32750 and S32760.
- Size Range : Weld Neck Flanges come in two key size categories. ASME B16.5 covers smaller sizes (typically 1/2" to 24"), perfect for most common piping. ASME B16.47 (Series A & B) addresses larger diameters (26" to 60") needed for high-volume flow in specialized industries.
- Chemical Composition : Duplex and Super Duplex stainless steels get their remarkable properties from meticulously crafted compositions. Chromium and nickel are the backbone, offering base corrosion resistance. Nitrogen boosts strength. Molybdenum and copper are crucial for resisting chlorides and acidic environments.
- Mechanical Properties : Beyond corrosion resistance, Duplex and Super Duplex flanges boast significantly higher tensile strength (how much stress before breaking) and yield strength (resistance to permanent deformation) than standard stainless steel
- High Tensile & Yield Strength : These flanges can withstand much higher pressures and mechanical stresses compared to basic stainless steel counterparts.
- Resistance to Chloride Stress Corrosion Cracking (SCC) : A major advantage, especially in marine, chemical, and oil & gas industries where chloride-induced SCC is a common cause of failure.
- Suitability for Harsh Environments : They excel in applications involving seawater, acidic chemicals, and aggressive fluids that would quickly degrade standard stainless steel.
- Welded Design : The secure welded connection ensures superior leak resistance and exceptional durability in high-pressure, high-temperature, or critical applications.
- Less Susceptible to Loosening : Compared to threaded flanges, they are less prone to loosening due to vibrations or thermal cycling.
- Versatility : Available in various grades, sizes, and pressure classes to suit diverse applications.
- Long service life : Their strength and corrosion resistance translate into extended lifespan and reduced maintenance requirements
- Refinery & Petrochemical : These weld neck flanges excel in critical process lines handling highly corrosive fluids, heat exchangers where high temperatures are involved, and high-pressure applications where superior strength is required.
- Chemical : They are vital in pipelines and vessels handling highly aggressive chemicals. Their exceptional corrosion resistance makes them ideal for critical process systems where material integrity is paramount.
- Oil & Gas : Super Duplex weld neck flanges are indispensable in offshore production platforms, subsea pipelines, and processing equipment due to their extreme resistance to seawater corrosion and ability to withstand harsh marine environments.
- Power Plant : These flanges are utilized in critical process lines handling corrosive fluids, high-pressure steam systems, and applications where strength and long-term reliability are key considerations.
- Offshore Platforms : Super Duplex weld neck flanges find favor in high-pressure seawater systems (e.g., fire suppression, ballast systems,) and critical process pipelines exposed to harsh marine environments, ensuring long-term integrity.
- Ship Building : Employed in high-pressure seawater piping, fuel transfer systems, and critical process lines within ships, offering strength, corrosion resistance, and extended service life in demanding marine settings.
- Industrial Machineries : Used in connecting pipes and tubes where high pressures, corrosive fluids, or elevated temperatures are factors, ensuring process reliability.
- Pharmaceuticals : Found in critical process pipelines and vessels handling highly purified chemicals, their superior corrosion resistance maintains product purity and prevents contamination.
- Pumps & Compressors : Used in crucial process piping for pumps and compressors, enabling the handling of corrosive fluids and high pressures, and guaranteeing uninterrupted operation
Chemical Composition
| Element | Percentage |
|---|---|
| Chromium (Cr) | 24 - 26% |
| Nickel (Ni) | 6 - 10% |
| Molybdenum (Mo) | 3- 5% |
| Nitrogen (N) | 0.2 - 0.3% |
