The flange produced by casting has accurate shape and size of the blank, small processing volume, and low cost, but there are casting defects (pores, cracks, inclusions); The internal structure of the casting has poor streamline (if it is a cutting part, the streamline is even worse);
Forged flanges generally have lower carbon content and are less prone to rusting compared to cast flanges. Forged flanges have better streamline, denser structure, and better mechanical properties than cast flanges;
Improper forging technology can also lead to large or uneven grain size, hardening cracks, and higher forging costs than casting flanges.
Forgings can withstand higher shear and tensile forces than castings.
The advantage of castings is that they can produce more complex shapes and have lower costs;
The advantage of forgings is that their internal structure is uniform and there are no harmful defects such as pores and inclusions in the castings;
The difference between cast flanges and forged flanges lies in the production process, for example, centrifugal flanges belong to a type of cast flange.
Centrifugal flanges belong to the precision casting method for producing flanges. This type of casting has a much finer microstructure and improved quality compared to ordinary sand casting, and is less prone to problems such as loose structure, porosity, and sand holes.
Firstly, we need to understand how centrifugal flanges are produced and produced, as well as the process and product of centrifugal casting to make flat welded flanges. Its characteristic is that the product is processed through the following process steps:
① Put the selected raw material steel into an intermediate frequency electric furnace for melting, so that the temperature of the molten steel reaches 1600-1700 ℃;
② Preheat the metal mold to 800-900 ℃ and maintain a constant temperature;
③ Start the centrifuge and inject the molten steel from step ① into the preheated metal mold from step ②;
④ The casting should be naturally cooled to 800-900 ℃ and kept for 1-10 minutes;
⑤ Cool with water to near room temperature, demold and remove the casting.
