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Large diameter welded flange
Large-diameter butt-welding flanges refer to flanges with a nominal diameter (DN) of 450 and above, featuring a neck and a circular pipe transition, which are butt-welded to pipes.
- Product Description
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Large-diameter butt-weld flanges refer to flanges with a nominal diameter of DN450 or more, with a neck and a circular pipe transition, which are connected to the pipe using butt welding. The following is a detailed introduction:
Structural Features
Neck Design: It has a relatively long neck, and the neck is butt-welded to the pipe. This effectively disperses stress, enhances the reliability of the flange-pipe connection, improves overall strength, and can withstand high temperatures, high pressures, repeated bending, and temperature fluctuations.
Seal Face Type: The seal face can be made in three types: smooth, raised face, and tongue and groove. Smooth faces are the most commonly used. Butt-weld flanges with a nominal pressure of 0.25-2.5 MPa often use raised face seal faces, which have better sealing performance.
Manufacturing Materials
Carbon Steel: Common materials include cast carbon steel grade WCB, forging A105, or Q235B, A3, 10#, 20 steel, etc. These are relatively inexpensive, have high strength, and can meet the requirements of general industrial pipelines. They are suitable for carbon steel pipeline connections with a nominal pressure not exceeding 2.5 MPa.
Stainless Steel: Such as 304, 316 stainless steel materials, which have excellent corrosion resistance and oxidation resistance, suitable for industries with high corrosion resistance requirements, such as chemical, food, and pharmaceutical industries.
Alloy Steel: Alloying elements are added according to specific needs to improve the strength, toughness, and wear resistance of the flange, allowing it to withstand greater pressure and impact. It is often used in pipeline connections under special conditions such as high pressure, high temperature, and high corrosion.
Product Advantages
Good Sealing: Reasonable structural design and various seal face types, combined with high-quality sealing gaskets, can effectively ensure sealing performance and prevent leakage of the medium in the pipeline.
High Strength: The neck butt-weld structure makes the flange have high strength and rigidity, is not easily deformed, can withstand higher pressure and tensile force, is suitable for pipelines with large pressure or temperature fluctuations, or high-temperature, high-pressure, and low-temperature pipelines, and can also be used in pipelines transporting expensive, flammable, and explosive media.
Solid Welding: The butt-welding method ensures good fusion between the flange and the pipe at the weld, resulting in high weld quality, reduced stress concentration, high welding strength, and a reliable connection.
Application Areas
Wind Power Industry Shipbuilding Mechanical Manufacturing 
Nuclear Power Industry Oilfield Industry Chemical Industry
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Mobile Phone: +86-13603506135
Contact Person: An Jihong
Email:ah@ahflange.com
Address: Jiangcun Industrial Park, Jiangcun Township, Dingxiang County, Xinzhou City
