Stainless steel 304 blind flange
Stainless steel blind flange is also called blind plate, which is also called flange cover. It is a flange without hole in the middle for sealing the pipe plug. The types of sealing surface are plane, convex, concave convex, mortise and groove, ring joint.
The production process of blind flange is mainly divided into forging, casting and cutting.
Cast and forged flanges
The casting flange has the advantages of accurate shape and size, small processing capacity and low cost, but it has casting defects (pores, cracks and inclusions); The streamline of internal structure of casting is poor (especially for cutting parts);
Forging flange generally contains less carbon than casting flange, is not easy to rust, has good streamline, compact structure and better mechanical properties than casting flange;
Improper forging process will also lead to large or uneven grains, hardening cracks, and the forging cost is higher than that of casting flange.
Forging can bear higher shear force and tensile force than casting.
The advantage of casting is that it can make a more complex shape, and the cost is relatively low;
The advantages of forgings are that the internal structure is uniform, and there are no harmful defects such as pores and inclusions in the castings;
From the production process difference between casting flange and forging flange, such as centrifugal flange is a kind of casting flange.
Centrifugal flange is produced by precision casting. Compared with ordinary sand casting, this kind of casting has much finer structure and better quality. It is not easy to have problems such as loose structure, air hole and trachoma.
First of all, we need to know how the centrifugal flange is produced and how the centrifugal casting process is used to make the flat welding flange
① The selected raw materials are melted in the medium frequency electric furnace to make the molten steel temperature reach 1600-1700 ℃;
② Preheat the metal mould to 800-900 ℃ and 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 ℃ for 1-10 minutes;
⑤ Cool with water to near room temperature, demould and take out the casting.