SS / Duplex & Super Duplex Forged Union
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SS / Duplex and Super Duplex Forged Union
A wide range of SS / Duplex and Super Duplex Forged Unions from EBY Fasteners are excellent choices that are made to last in demanding pipe systems. Our forged unions made of stainless steel (SS) are ideal for industrial applications, chemical processing, and different process piping systems because they provide dependable strength and resistance to corrosion
When the environment demands more, consider our Duplex forged unions. Their unique composition offers a significant increase in strength and resilience against pitting, crevice corrosion, and chloride stress cracking, ensuring long-term integrity in harsh conditions
For the most extreme environments involving seawater, aggressive chemicals, and high pressures, EBY Fasteners’ Super Duplex forged unions are the ultimate solution. These unions are engineered with exceptional corrosion resistance and mechanical strength to provide unwavering reliability in the most unforgiving applications
For the most extreme environments involving seawater, aggressive chemicals, and high pressures, EBY Fasteners’ Super Duplex forged unions are the ultimate solution. These unions are engineered with exceptional corrosion resistance and mechanical strength to provide unwavering reliability in the most unforgiving applications
- ASTM / ASME A/SA 182 : This foundational standard covers forged steel fittings, including unions. It outlines the various grades of steel, their required chemical compositions, and mechanical properties to ensure quality and performance.
- F304/304L : These classic stainless steel grades offer a baseline of corrosion resistance and strength, suitable for general industrial and process piping applications. 304L, the low-carbon version, has improved weldability.
- F316/316L : These grades include molybdenum for enhanced corrosion resistance, particularly against chlorides. They're a good choice for chemical processing, marine environments, and applications requiring increased toughness.
- F51 (UNS S32205/S31803) : This common Duplex grade provides a substantial improvement in corrosion resistance and strength compared to standard stainless steel. It's a reliable option for handling harsher chemicals and more demanding environments.
- F55 (UNS S32760) : This Super Duplex grade offers unmatched protection against corrosion and boasts exceptional strength. Forged unions in F55 are designed for the most extreme conditions, such as seawater systems, aggressive chemical handling, and high-pressure applications
- Materials : For basic applications, stainless steel grades like 304L and 316L suffice. For tougher environments, Duplex (like F51) brings increased strength and combats corrosion. Choose Super Duplex (like F55) for extreme conditions, especially those involving seawater or harsh chemicals.
- Standards : Forged unions are built to rigorous standards. ASTM A182/ASME SA182 is the cornerstone, while others like ASME 16.11 and MSS SP-79 ensure the right fit and pressure handling.
- Sizing : Select the Nominal Pipe Size (NPS) that matches your existing pipes. Then, choose a pressure class (e.g., 3000#, 6000#) that exceeds your system's working pressure for safety.
- Connections : Threaded unions (usually NPT) are easiest to install. Socket-weld provides a stronger, leak-tight seal. Butt-weld may be an option for permanent, extra high-pressure connections.
- Fighting Corrosion : The specific alloy (F51, F55, etc.) determines how well your union resists corrosion. Manufacturers carefully add chromium, nickel, molybdenum, and other elements to tailor protection for your specific environment.
- Strength : Duplex and Super Duplex unions are much stronger than basic stainless steel. This means they can handle higher pressures and are generally more durable, leading to a longer lifespan and less downtime
- Built Tough : Forged unions boast exceptional strength, surpassing that of standard fittings. This translates to reliable performance under high pressures, demanding conditions, and in installations where mechanical stress is a concern.
- Corrosion Fighters : Stainless steel unions offer a baseline of protection, while Duplex and Super Duplex significantly up the ante. These grades expertly resist pitting, crevice corrosion, and even aggressive chemicals. Choose Duplex for tough environments and Super Duplex for the most extreme conditions, including those involving seawater.
- Easy Installation and Maintenance : Threaded or socket-weld options allow for quick pipe connections and offer flexibility based on your system's design. The union design itself enables simple disassembly for inspection, cleaning, or making changes to your piping layout.
- Leak-Proof Performance : Forged unions create a secure, leak-tight seal. This is especially important for critical fluids, high-pressure systems, or whenever leaks would pose dangers or lead to costly product loss.
- Long-Term Reliability : The combination of strength and corrosion resistance makes for a long-lasting and dependable fitting. This translates to lower maintenance costs, less downtime due to failures, and peace of mind in demanding applications.
- Versatility : With various grades, sizes, and end connections available, forged unions adapt to fit a wide range of industries and applications. From chemical processing to offshore environments, there's a forged union to match your specific needs
- Refinery & Petrochemical : Forged unions are vital for joining pipelines carrying corrosive process fluids, connecting equipment where strength and leak resistance are paramount, and providing quick-connect points for maintenance in high-pressure systems.
- Chemical : These unions are essential for joining process lines, sealing vessels handling highly corrosive chemicals, and creating secure, leak-proof connections in critical systems where product purity and safety are essential.
- Oil & Gas : Super Duplex forged unions are crucial on subsea pipelines facing extreme seawater corrosion. They're also invaluable for connecting pipelines and equipment on offshore platforms where corrosive fluids and harsh environments demand reliability.
- Power Plant : Forged unions join pipelines handling process fluids where corrosion is a concern, especially in coastal power plants using seawater for cooling. Their strength and leak-tight design promote safe, reliable operation.
- Offshore Platforms : Super Duplex forged unions are favored for connecting pipelines and vessels handling seawater or corrosive process fluids. Their exceptional corrosion resistance, strength, and easy installation ensure long-term integrity in the harsh marine environment.
- Ship Building : Employed in fuel lines, seawater systems, and various process piping where strength, corrosion resistance, and convenient installation promote long-term dependability in shipboard systems.
- Industrial Machineries : Forged unions connect pipes and vessels within industrial machines handling corrosive fluids, operating under high pressure, or requiring secure, leak-free seals for safety and efficiency.
- Pharmaceuticals : Suitable for process pipelines and vessels handling sensitive chemicals within pharmaceutical plants. Their corrosion resistance ensures purity, and their strong connections prevent leaks and contamination risks
Chemical Composition
| Element | Percentage |
|---|---|
| Chromium, Cr | 24 – 26% |
| Nickel, Ni | 6 – 8% |
| Molybdenum, Mo | 3 – 5% |
| Manganese, Mn | 1.20% max |
| Silicon, Si | 0.80% max |
| Copper, Cu | 0.50% max |
| Nitrogen, N | 0.24 – 0.32% |
| Phosphorous, P | 0.035% max |
| Carbon, C | 0.030% max |
| Sulfur, S | 0.020% max |
| Iron, Fe | Balance |
