SS / Duplex & Super Duplex Stubends
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SS / Duplex and Super Duplex Stubends
EBY Fasteners offers a comprehensive selection of high-quality SS / Duplex and Super Duplex Stubends. These precision-engineered fittings are essential components in piping systems where superior corrosion resistance and strength are paramount. Our Stubends are manufactured from premium stainless steel, duplex stainless steel, and super duplex stainless steel grades, ensuring their exceptional performance in demanding industrial environments
We adhere to stringent manufacturing standards, including ASTM A815, ASME SA815, ASTM A182, and ASME SA182. EBY Fasteners’ Stubends are available in seamless, welded, and fabricated constructions, with a wide range of sizes, schedules, and pressure ratings to suit diverse project requirements. Our meticulous quality control processes guarantee optimal durability and reliability
Whether you operate in the oil and gas, petrochemical, marine, or other critical industries, EBY Fasteners is your trusted source for SS / Duplex and Super Duplex Stubends. Our commitment to excellence, backed by our ISO 9001-2018, ISO 14001, ISO 45001 & PED certifications, ensures you receive top-tier products and outstanding customer service
Whether you operate in the oil and gas, petrochemical, marine, or other critical industries, EBY Fasteners is your trusted source for SS / Duplex and Super Duplex Stubends. Our commitment to excellence, backed by our ISO 9001-2018, ISO 14001, ISO 45001 & PED certifications, ensures you receive top-tier products and outstanding customer service
- 304/304L : Versatile grades providing adequate corrosion resistance and weldability. Suitable for general-purpose applications where extreme environments aren't a factor.
- 316/316L : Offers excellent corrosion resistance, especially against chlorides and acids. Frequently used in chemical processing and marine environments where extra protection is required.
- 2205 (UNS S31803/ S32205) : The standard duplex grade providing a favorable balance of strength, corrosion resistance, and affordability. Significantly stronger than standard stainless steel with better resistance to stress corrosion cracking.
- Lean Duplex (e.g., UNS S32304) : A more cost-effective duplex alternative to 2205. Offers moderate strength and corrosion resistance, suitable for less demanding environments.
- (UNS S32750) : Designed for severe environments where high strength and superior corrosion resistance are essential. Used in aggressive offshore, chemical processing, and desalination systems.
- (UNS S32760) : Boasts outstanding resistance to a broader range of acids and exceptional strength. Ideal for the harshest environments where pitting, crevice corrosion, and stress corrosion cracking are concerns
- Standards : SS/Duplex and Super Duplex Stubends typically follow ASTM A815/ASME SA815, ASTM A182/ASME SA182 , and MSS SP-43 (dimensions). These ensure compatibility and quality standards.
- Size and Pressure Handling : Stubends match standard Nominal Pipe Sizes (NPS) for seamless integration. Wall thickness (schedule) is crucial for pressure handling. Options range from light-duty (SCH 10) to extra heavy-duty (SCH 160) for extreme pressures.
- Construction : Seamless Stubends offer slightly higher strength, while welded options can be more economical. Fabricated Stubends are available for highly customized needs.
- Material Selection : The specific grade of stainless steel, duplex, or super duplex steel is vital for matching the corrosion resistance demands of your application. Verify that the chemical composition aligns with the chosen grade's specifications.
- Properties and Certification : Consider the stub end's yield strength, tensile strength, and elongation. Material Test Reports (MTRs) are important for verifying the material. Additional testing (e.g., pressure testing, NACE compliance) might be required for specific high-pressure or corrosive environments
- Corrosion Resistance : Standard stainless steel (304/304L) provides good protection in general environments, while 316/316L offers enhanced resistance to chlorides and acids. Duplex and super duplex grades excel in even harsher conditions, with super duplex varieties specifically designed for extremely corrosive, seawater-like environments.
- Strength : Duplex and super duplex Stubends boast significantly higher yield and tensile strength compared to standard stainless steel. This allows them to withstand higher pressures and mechanical stress, making them ideal for demanding industrial applications.
- Temperature Versatility : These materials can handle both high and low temperatures, with specific grades being tailored for either extreme. It's essential to select the right grade based on your operating temperature range.
- Weldability : Most SS/duplex and super duplex grades are readily weldable, allowing for seamless integration into your piping systems. However, super duplex grades might necessitate more specialized welding procedures and filler materials to maintain their outstanding properties.
- Cost-Effectiveness : 304/304L stainless steel is the most budget-friendly option. Duplex grades provide a balance between cost and improved performance. Super duplex grades, while the most expensive, offer exceptional value when extreme corrosion resistance and strength are paramount to system longevity
- Refineries & Petrochemical : Stubends handle corrosive chemicals, sour gas, and high-pressure, high-temperature environments. Duplex and super duplex grades are particularly valuable for their superior resistance.
- Chemical Industry : These Stubends excel in applications involving acids, alkalis, and other aggressive chemicals found in chemical processing.
- Oil & Gas : Resistance to saltwater, H2S, and chlorides is crucial. Stubends find use in pipelines, processing facilities, and offshore platforms.
- Power Plants : Stubends are employed in cooling water systems, heat exchangers, and applications requiring resistance to various chemistries and temperatures.
- Offshore Platforms : Super duplex grades dominate, offering unmatched resistance to seawater corrosion in topside equipment and subsea piping.
- Shipbuilding : Stubends are found in ballast water systems, seawater piping, and anywhere high chloride resistance is needed.
- Industrial Machinery : Applications include hydraulic systems, pulp and paper equipment, and machinery handling corrosive process fluids.
- Pharmaceuticals : High-grade stainless steel maintains hygienic conditions in pharmaceutical manufacturing.
- Pumps & Compressors : Stubends provide reliable connection points for pumps and compressors handling corrosive or high-pressure fluids.
- Dairy & Food Processing : Used in piping and equipment where hygiene and resistance to mild corrosives are crucial.
- Sugar Mills : Stubends are utilized in handling process fluids and chemicals involved in sugar production.
- Textile Machinery : Employed in dyeing and finishing processes where resistance to specific chemicals is needed.
- Fertilizers & Pesticides : Duplex or super duplex grades are often necessary in the highly corrosive environments of fertilizer and pesticide production
Chemical Composition
| Element | Percentage Range |
|---|---|
| Carbon (C) | 0.08% max |
| Chromium (Cr) | 16-26% |
| Nickel (Ni) | 2.5-14% |
| Molybdenum (Mo) | 0-4.5% |
| Nitrogen (N) | 0.1-0.4% |
| Other Notable Elements | Copper (Cu), Tungsten (W), Manganese (Mn) |
