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Duplex Stainless Steel Pipe Fittings
Duplex steel pipe fittings are essential in industries that require both strength and corrosion resistance, such as chemical processing, oil and gas, marine, and power generation. Made from duplex stainless steel, these fittings offer a balanced microstructure of austenite and ferrite, delivering superior performance in environments with high chloride exposure, extreme temperatures, and high pressure.
Key Benefits of Duplex Steel Pipe Fittings
- Exceptional Corrosion Resistance: Duplex stainless steel is highly resistant to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for harsh environments.
- High Strength and Durability: Duplex steel has nearly double the strength of standard austenitic stainless steels like 304 and 316, providing a long-lasting solution in demanding applications.
- Good Weldability: Duplex steel is weldable and can be fabricated into a variety of shapes without losing its corrosion-resistant properties.
- Cost-Effective: With a lower nickel and molybdenum content than some stainless steels, duplex steel can be a more economical choice for corrosion-resistant applications.
Duplex Steel Grades for Pipe Fittings
Our duplex steel pipe fittings are available in various grades to suit different requirements:
- Duplex 2205 (UNS S32205/S31803): The most widely used duplex grade, offering excellent resistance to general corrosion and stress corrosion cracking. Ideal for use in seawater, oil and gas processing, and chemical processing.
- Super Duplex 2507 (UNS S32750): This super duplex grade offers even greater corrosion resistance, with higher chromium, molybdenum, and nitrogen content. Used in more demanding applications, such as deep-sea exploration and petrochemical processing.
- Lean Duplex: Lean duplex grades have a lower alloy content and are cost-effective, offering moderate corrosion resistance suitable for applications with low chloride exposure.
Types of Duplex Steel Pipe Fittings
- Elbows: Duplex steel elbows are used to change the flow direction in a piping system, available in 45°, 90°, and custom angles.
- Tees: Used to branch a pipeline, duplex steel tees are available as equal and reducing tees to connect pipes of different sizes.
- Reducers: Concentric and eccentric reducers are used to connect pipes of different diameters, ensuring smooth fluid flow with minimal pressure drop.
- Stub Ends: Commonly used with lap joint flanges, duplex steel stub ends allow for easy disassembly and reassembly of piping systems.
- Caps: Pipe caps are used to seal off the end of a pipe, preventing the flow of liquids or gases.
- Crosses: Duplex steel crosses are used in complex piping systems to allow four-way branch connections.
Applications of Duplex Steel Pipe Fittings
- Oil and Gas Industry: Duplex steel fittings are widely used in offshore drilling, pipelines, and refining processes due to their resistance to chloride stress corrosion.
- Chemical Processing: Highly resistant to various acids, duplex steel pipe fittings are ideal for handling chemicals in refineries and processing plants.
- Marine Applications: Duplex fittings are commonly used in seawater cooling, ballast water treatment, and desalination plants due to their resistance to corrosion in saltwater environments.
- Power Generation: In nuclear and fossil fuel power plants, duplex fittings are essential for handling high-temperature and high-pressure environments.
- Water Treatment: Duplex steel is commonly used in water treatment facilities due to its resistance to corrosion and contamination.
Specifications and Standards
Our duplex steel pipe fittings are manufactured to meet global standards, ensuring consistency and quality:
- ASTM A815: Specification for duplex and super duplex stainless steel pipe fittings for pressure applications.
- ASME B16.9: Standard for factory-made wrought buttwelding fittings.
- ASME B16.28: Standard for wrought steel buttwelding short radius elbows and returns.
- EN 10253-4: European standard for welded and seamless duplex stainless steel fittings.
Surface Finishes and Treatments
Duplex steel fittings are available with various surface finishes for enhanced durability and aesthetics:
- Pickled Finish: A clean, corrosion-resistant finish achieved by pickling to remove impurities.
- Bead Blast Finish: Provides a smooth, matte finish commonly used in aesthetic applications.
- Electropolished Finish: Ideal for sanitary and pharmaceutical applications, offering a bright, mirror-like surface.
- Machined Finish: Precision-machined for applications that require strict tolerances.
Customization Options
We offer duplex steel pipe fittings in standard and custom specifications to meet unique project requirements:
- Size and Thickness: Available in a variety of sizes and thicknesses to meet pressure requirements.
- Shapes and Configurations: Custom shapes, such as long-radius elbows, special reducers, and non-standard angles, can be fabricated.
- Surface Treatments: Additional treatments, such as electropolishing or bead blasting, are available based on your specific application.
Quality Assurance
Each duplex steel fitting undergoes rigorous quality checks to meet the highest standards:
- Mechanical Testing: Tests for tensile strength, impact resistance, and durability to ensure reliability under extreme conditions.
- Corrosion Resistance Testing: Ensures resistance to pitting, crevice corrosion, and stress corrosion in harsh environments.
- Dimensional Accuracy: Precision-engineered to meet tight tolerances for seamless installation in your piping system.
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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