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Duplex Stainless Steel Flanges
Duplex stainless steel flanges are prized for their superior strength, durability, and corrosion resistance, making them ideal for piping systems in industries that encounter harsh environments. With a unique microstructure that combines austenitic and ferritic stainless steel properties, duplex flanges offer excellent performance in demanding applications, such as chemical processing, oil and gas, and marine applications.
Key Benefits of Duplex Stainless Steel Flanges
- Enhanced Corrosion Resistance: Duplex stainless steel is highly resistant to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-rich environments.
- High Strength: Duplex flanges are nearly twice as strong as standard austenitic stainless steels, making them suitable for high-stress applications.
- Cost Efficiency: With lower nickel and molybdenum content compared to other high-performance alloys, duplex stainless steel is a cost-effective choice for many industrial applications.
- Excellent Weldability and Durability: Duplex stainless steel flanges are highly weldable, with minimal risk of cracking, and they exhibit excellent durability in extreme temperatures.
- Long Service Life: Due to their high resistance to corrosion and fatigue, duplex flanges offer an extended service life, reducing maintenance costs.
Types of Duplex Stainless Steel Flanges
We offer a comprehensive range of duplex stainless steel flange types to meet various connection needs:
- Weld Neck Flanges: Provide a strong, seamless connection with high resistance to stress, ideal for high-pressure applications.
- Slip-On Flanges: Economical and easy to install, slip-on flanges are commonly used in low-pressure applications.
- Blind Flanges: Used to seal the end of a piping system, blind flanges are essential in applications that require future expansion or maintenance access.
- Socket Weld Flanges: Suitable for small-diameter, high-pressure systems, socket weld flanges provide a reliable connection with a single weld.
- Threaded Flanges: Threaded flanges screw onto pipes and require no welding, ideal for low-pressure systems.
- Lap Joint Flanges: Often used with stub ends, lap joint flanges allow easy alignment and disassembly, making them ideal for systems requiring frequent inspection.
- Orifice Flanges: Specifically designed for flow measurement, orifice flanges have precision-machined holes to accommodate flow measurement devices.
Grades of Duplex Stainless Steel for Flanges
- Duplex 2205 (UNS S32205): Offers excellent corrosion resistance, particularly in chloride-rich environments, making it one of the most popular duplex grades.
- Super Duplex 2507 (UNS S32750): Provides even greater corrosion resistance and strength than standard duplex grades, suitable for highly demanding environments.
- Lean Duplex 2101 (UNS S32101): With lower nickel and molybdenum content, Lean Duplex 2101 offers cost-effective performance in general industrial applications.
- Other Grades: Additional grades, such as Duplex 2304 and 329, are available to meet specific application requirements.
Applications of Duplex Stainless Steel Flanges
- Oil and Gas Industry: Used extensively in pipelines, pressure vessels, and offshore platforms due to their corrosion resistance and high strength.
- Chemical Processing: Ideal for tanks, reactors, and piping systems exposed to aggressive chemicals, acids, and high chloride environments.
- Marine and Offshore: Highly resistant to seawater corrosion, duplex flanges are used in seawater cooling systems, desalination plants, and other marine applications.
- Pulp and Paper Industry: Duplex stainless steel resists the acidic and chloride-laden environments in pulp and paper manufacturing.
- Power Generation: Duplex flanges are utilized in both nuclear and conventional power plants for their durability in high-pressure and high-temperature conditions.
Manufacturing Standards for Duplex Stainless Steel Flanges
Our duplex stainless steel flanges are manufactured to comply with international standards, ensuring quality, safety, and performance:
- ASTM A182: Specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves.
- ASME B16.5: Covers pipe flanges and flanged fittings up to 24 inches.
- ASME B16.47: Specification for large-diameter steel flanges (Series A and B).
- DIN EN 1092-1: European standard for steel flanges.
- ISO 15156/NACE MR0175: Specifies materials for sour gas applications in oil and gas industries.
Flange Face Types
We offer duplex stainless steel flanges in various face types to meet different sealing requirements:
- Flat Face (FF): Ideal for low-pressure applications with a smooth, flat sealing surface.
- Raised Face (RF): Commonly used in high-pressure systems for a strong seal.
- Ring Type Joint (RTJ): Suitable for high-pressure, high-temperature applications, featuring a grooved surface that holds a metal ring for sealing.
- Male-Female and Tongue-Groove: Provides additional sealing strength for applications requiring secure, leak-proof connections.
Quality Assurance
Each duplex stainless steel flange undergoes rigorous testing and quality checks to ensure durability and performance:
- Mechanical Testing: Tests for tensile strength, hardness, and impact resistance.
- Corrosion Testing: Verifies the flange’s resistance to pitting, crevice corrosion, and stress corrosion cracking.
- Dimensional Accuracy: Ensures precision machining and compatibility with various piping systems.
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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