Welcome: Sino Special Metal Co., Ltd.
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sales@ssmsteel.com
86-19527792928
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Size: Duplex flanges are available in a wide range of sizes, from 1/2" to 48" and beyond.
Pressure Rating: The pressure rating of duplex flanges can vary from 150# to 2500# and above, depending on the application requirements.
Facing: Duplex flanges can be manufactured with different types of facing, including raised face (RF), flat face (FF), ring type joint (RTJ), and tongue and groove (T&G).
Material Grade: Duplex flanges are available in different grades such as UNS S31803, UNS S32205, UNS S32750, and UNS S32760, among others.
Standard: Duplex flanges can be manufactured to comply with various standards, such as ANSI/ASME, API, DIN, BS, and EN.
what is a duplex flange?
A Duplex Flange is a type of flange used in piping systems that is made from duplex stainless steel. Duplex stainless steel is a type of stainless steel that has a two-phase microstructure consisting of both austenitic and ferritic phases, which provides enhanced strength, corrosion resistance, and durability.
Duplex flanges typically have a raised face or flat face and are used to connect pipes or other equipment together. They are designed to withstand high pressure and high temperature applications in industries such as oil and gas, chemical processing, and offshore and marine environments.
The duplex flange has a number of advantages over other types of flanges, including increased strength and durability, improved resistance to corrosion and pitting, and better performance in high temperature and high pressure environments. These advantages make duplex flanges an ideal choice for demanding applications where reliability and performance are critical.
Duplex flanges are made from Duplex stainless steel, which is a type of stainless steel that contains a combination of austenitic and ferritic microstructures in its crystal lattice. The most common grades of Duplex stainless steel used in flange manufacturing are UNS S31803 (also known as 2205) and UNS S32750 (also known as 2507). The chemical compositions of UNS S31803 (2205) and UNS S32750 (2507) are as follows:
Element | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Nitrogen (N) | Iron (Fe) |
UNS S31803 (2205) | 22.0 - 23.0% | 4.5 - 6.5% | 2.5 - 3.5% | 2.0% max | 1.0% max | 0.03% max | 0.02% max | 0.08 - 0.20% | Balance |
UNS S32750 (2507) | 24.0 - 26.0% | 6.0 - 8.0% | 3.0 - 5.0% | 1.2% max | 0.8% max | 0.035% max | 0.02% max | 0.24 - 0.32% | Balance |
Both of these grades of Duplex stainless steel contain a combination of austenitic and ferritic microstructures, which provide high strength, good corrosion resistance, and resistance to stress corrosion cracking. UNS S32750 (2507) has higher levels of chromium, nickel, and molybdenum, as well as a higher nitrogen content, which makes it more resistant to corrosion in highly acidic and chloride-rich environments compared to UNS S31803 (2205).
Duplex flanges are available in various specifications depending on their application requirements. Some common specifications for duplex flanges include:
Specification | Description |
Size | Available in a wide range of sizes, from 1/2" to 48" and beyond |
Pressure Rating | Can vary from 150# to 2500# and above, depending on the application requirements |
Facing | Can be manufactured with different types of facing, including raised face (RF), flat face (FF), ring type joint (RTJ), and tongue and groove (T&G) |
Material Grade | Available in different grades such as UNS S31803, UNS S32205, UNS S32750, and UNS S32760, among others |
Standard | Can be manufactured to comply with various standards, such as ANSI/ASME, API, DIN, BS, and EN |
End Connections | Can be manufactured with different end connections, such as weld neck, slip-on, socket weld, threaded, and blind, among others |
Coating | Can be coated with various materials, such as PTFE, Xylan, and other types of coatings, to improve their performance in certain applications |
Duplex flanges are widely used in various industries due to their excellent properties, including high strength, corrosion resistance, and durability. Some common applications of duplex flanges include:
Industry/Application | Usage of Duplex Flanges |
Oil and gas industry | Used in oil and gas pipelines, offshore platforms, and other equipment that require high strength and corrosion resistance. |
Chemical industry | Used in chemical processing plants and storage tanks, where they can resist the corrosive effects of chemicals. |
Power generation | Used in power plants, including nuclear and thermal power plants, where they can withstand high temperatures and pressures. |
Water treatment | Used in water treatment plants, where they can resist corrosion from the harsh chemicals used in the treatment process. |
Food and beverage industry | Used in food processing equipment, where they can resist corrosion from acidic and salty substances. |
SSM manufactures and supplies Duplex stainless steel flanges in various sizes and materials. We have a strong technical support team and industrial workers to ensure product quality and delivery. Please feel free to call us for inquiries about carbon steel flanges.
Contact: Sino Special Metal Co., Ltd.
Phone: 86-19527792928
E-mail: sales@ssmsteel.com
Whatsapp:86-19527792928
Add: Mudu town Jinfeng South Road, Wuzhong District, Suzhou City, Jiangsu Province
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