The flange production process is mainly divided into forging, casting, cutting and rolling. Let's take a brief look at cut flanges and rolled flanges.
First, cut the flange. Directly cut the flange disc with the machining volume inside and outside diameter and thickness on the middle palate, and then perform bolt hole and waterline processing. The flange produced in this way is called a cut flange, and the maximum diameter of such flanges is limited to the width of the middle plate.
Second, rolled flange. The process of cutting the sliver from the middle plate and then rolling it into a circle is called rolling, and it is mostly used for the production of some large flanges. After the rolling is successful, welding is performed, then flattened, and then the waterline and bolt holes are processed.
Let's introduce the cast flange and forged flange in detail:
First, cast flanges and forged flanges
The flanges cast out have accurate blank shapes and sizes, small processing volume, and low cost, but have casting defects (porosity, cracks, inclusions); the internal structure of the casting is less streamlined (if it is a cutting part, the streamlined is worse);
Forged flanges generally have lower carbon content than cast flanges and are less prone to rust. The forgings are more streamlined, have a denser structure, and have better mechanical properties than cast flanges;
Improper forging process will also cause large or uneven grains, hardening cracks, and the cost of forging is higher than that of cast flanges.
Forgings can withstand higher shear and tensile forces than castings.
The advantages of castings are that they can produce more complex shapes and lower costs;
The advantage of forging is that the internal structure is uniform, and there are no harmful defects such as pores and inclusions in the casting;
The difference between cast flanges and forged flanges from the production process, such as centrifugal flanges are a type of cast flanges.
The centrifugal flange belongs to the production flange of the precision casting method. This type of casting is much thinner than ordinary sand casting, and the quality is improved a lot. It is not easy to have problems such as loose tissue, porosity, and trachoma.
First of all, we need to understand how threaded flanges are produced. The process and products of centrifugal casting to make flat welded flanges are characterized by the following processing steps:
① The selected raw material steel is smelted in an intermediate frequency electric furnace so that the temperature of the molten steel reaches 1600-1700 ° C;
② Preheat the metal mold to 800-900 ℃ to keep constant temperature;
③ Start the centrifuge and inject the molten steel in step ① into the metal mold after preheating in step ②;
④ The casting is naturally cooled to 800-900 ° C and held for 1-10 minutes;
⑤ Cool with water to near normal temperature, and remove the casting from the mold.
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