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Duplex Stainless Steel Pipe Fittings
Industries with high demands for strength as well as corrosion resistance, such as the petroleum and chemical processing industries and the Power Generation sector, are where duplex stainless steel pipe fittings are required. These fittings are manufactured from duplex stainless steel, which occurs when stainless steel maintains a combination of ferrite and austenite microstructures, resulting in superior performance in strongly corrosive environments with high levels of chlorides, extreme temperatures & pressures.
Duplex Steel Pipe Fitting Key Benefits
- Excellent Corrosion Resistance – Duplex stainless steel has superior resistance to crevice corrosion and stress corrosion cracking, which makes it suitable for use in a variety of extremely corrosive applications.
- Extremely High Strengths – Duplex stainless steel‘s nearly double strength as compared to standard grades, such as austenitic stainless steel,s creates a very durable, long-lasting product when used in extreme applications.
- Excellent Weldability – Duplex stainless steel is fabricated by standard welding methods and fabricated into different shapes without losing its capabilities to resist corrosion.
- Cost Effectiveness – Due to being considerably lower content of nickel and molybdenum compared to certain stainless steel grades, duplex stainless steel is frequently lower in cost for many applications where it is being used.
Duplex Steel Grades for Pipe Fittings
Duplex Steel Pipe Fittings are offered in several different grades to meet the different applications.
- Duplex 2205 (UNS S32205/S31803): The most commonly used grade, which is known for its great ability to resist many types of attack, such as general corrosion and stress corrosion cracking. It is also one of the most popular grades used in seawater and for oil and gas processing, chemical processing and any other industry where corrosion is a concern.
- Super Duplex 2507 (UNS S32750): This is a super duplex grade with an even higher level of corrosion resistance and contains more chromium, molybdenum and nitrogen than Duplex 2205 and is often used in the most severe applications of deep sea exploration, petrochemicals, water, and more.
- Lean Duplex: These grades are lower in alloy content but still provide corrosion resistance, and are very affordable for use in applications with a lower level of chloride.
Types of Duplex Steel Pipe Fittings
- Duplex Steel Elbows – used to change the direction of fluid flow in a pipe system (e.g., 45° and 90° elbows).
- Duplex Steel Tees – used to create an offshoot of a pipeline and come in equal and reducing tees (to connect two pipes of different diameters).
- Duplex Steel Reducers – concentric and eccentric (reducing) – used to connect pipes with different diameters with very low–pressure drops through the reduced area.
- Duplex Steel Stub Ends – used in conjunction with lap joint flanges because they enable simple and fast disassembly/reassembly of piping systems
Applications of Duplex Steel Pipe Fittings
- Oil and Gas Industry: The resistance of duplex steel to chloride stress corrosion makes it a popular choice for offshore drilling projects, refineries, and pipelines.
- Chemical Processing: The high level of acid resistance provided by duplex steel pipe fittings makes them an ideal material to use for chemical processing operations and refineries.
- Marine Applications: Due to their high degree of corrosion resistance while exposed to seawater, duplex fittings are commonly utilized for various marine applications such as seawater cooling (thermal heat exchangers), ballast water (bio–fouling prevention), and desalination plants (fresh water production).
- Power Generation: The use of duplex fittings is essential when dealing with equipment operating under high temperature (over 250 °C) and pressure (over 25 bar) environments, such as nuclear power plants and fossil fuel power plants (renewable sources).
- Water Treatment: Due to their corrosion resistance when exposed to contaminated water, duplex fittings are often utilized within municipal water treatment facilities.
Manufacturing Specifications and Standards
We manufacture duplex steel pipe fittings to meet international specifications, helping to guarantee a consistent quality product:
- ASTM A815: Specification for duplex and super duplex stainless steel fittings intended for pressure applications
- ASME B16.9: Standard for wrought buttwelding fittings made in factories
- ASME B16.28: Standard for short radius elbows and returns made of wrought steel buttwelding.
- EN 10253-4: European Specification for welded & seamless Duplex Stainless Steel pipe fittings
Surface Finishes and Treatments
Duplex steel pocket fittings are available with various finishes to enhance durability and provide aesthetics.
- Pickled Finish – A clean corrosion-resistant finish obtained through the process of pickling, which removes surface impurities.
- Bead Blast Finish – A smooth matte finish commonly associated with aesthetic purposes.
- Electropolished Finish – A high shine, mirror–like finish, ideal for pharmaceutical and sanitary applications.
- Machined Finish – Precision machined to tight tolerances for those applications requiring strict tolerance.
Customization Options
We can provide standard and custom duplex steel pipe fittings according to your specific needs.
- Size and wall thickness – offered in a range of sizes and thicknesses based on the pressure requirements.
- Shape and configuration – custom shapes can be made; examples of shapes include long radius elbows, special reducers, and non-standard angles.
- Surface treatment – you may choose to have your fittings treated with electropolishing and bead blasting, depending on the needs of your installation.
Quality Assurance
Duplex steel fittings are subjected to stringent quality control to ensure compliance with high-quality standards.
- Mechanical Testing – All fittings undergo mechanical tests to measure tensile strength, impact resistance, and durability to ensure reliable performance in extreme environments.
- Corrosion Resistance Testing – Pitting and crevice corrosion resistance are tested to assure quality in adverse environments.
- Dimensional Accuracy – Each fitting is designed to meet very tight tolerances to allow for a perfect fit in your piping installation.
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Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry