The manufacturing process of flanges directly affects the internal quality, mechanical properties, and service life of products. At present, the main production processes for flanges include forging, casting, cutting, and rolling. Among them, forged flanges and cast flanges are the two most mainstream production methods.
Forging flanges is a process of forming metal blanks by applying pressure to them to cause plastic deformation. The forging process includes processes such as cutting, heating, forming, and cooling after forging. Forging can be divided into free forging and die forging: free forging is suitable for single piece or small batch production of simple shapes, while die forging is suitable for large-scale production of high-precision parts. During the forging process, the grains inside the metal are refined and densified, with a reasonable streamline distribution. Therefore, the internal structure of forged flanges is denser, and their mechanical properties – especially strength, toughness, and fatigue resistance – are superior to those of cast flanges. Forged flanges perform more reliably under harsh working conditions such as high temperature and high pressure.
Casting flanges is the process of pouring molten metal into a mold and cooling it to form. The advantages of casting flanges are precise blank shape and size, small machining allowance, and lower production costs. However, there are also some inherent defects in the casting process: casting defects such as porosity, cracks, and inclusions may appear inside the casting; The internal structure of the casting has poor streamline. These defects may affect the sealing performance and pressure bearing capacity of the flange. At present, a small number of low-quality flange castings on the market are manufactured using inferior raw materials, which can easily lead to leakage problems during use.
Centrifugal casting is a special form of casting technology and belongs to precision casting methods. Centrifugal casting uses centrifugal force to solidify molten metal on the inner wall of the mold, resulting in a much finer structure and significantly improved quality compared to ordinary sand casting. It is less prone to problems such as loose structure, porosity, and sand holes.
Cutting flanges is the process of directly cutting flange blanks from steel plates or plates, suitable for small batch or special specification flange production. Rolling flanges are made by welding steel plates into a circular shape before processing.
In actual procurement, forged flanges are usually considered to have higher quality, especially suitable for critical equipment and high-pressure pipelines. Casting flanges has advantages in cost sensitive ordinary working conditions. Understanding the characteristics of different manufacturing processes can help make a reasonable choice between quality and cost.
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