Flange is to make the pipe and pipe and valve interconnection parts, connected to the end of the pipe; also used in the equipment import and export of the flange, for the connection between the two equipment is to make the pipe and pipe interconnection parts, connected to the end of the pipe. It is a kind of accessory products of pipeline. The main materials of forged flange are carbon steel, alloy steel, stainless steel. The main standards are national standard, electric standard, American standard, German standard, Japanese standard and so on. The main anti-corrosion treatment is oiled and galvanized. Forged flanges have better pressure and temperature resistance, and are generally used in high pressure and high temperature working environment. Casting out of the flange, the blank shape and size is accurate, processing small, low cost, but there are casting defects (porosity. Cracks. Inclusions); casting internal organization streamline set her poorer (if cutting parts, streamline worse);.
Forging flange is generally lower than the casting flange carbon content is not easy to rust, forging good streamline, the organization is more dense, mechanical properties are better than casting flange.
Improper forging process will also appear grain size or uneven, hardening crack phenomenon, forging cost is higher than casting flange.
Forgings can withstand higher shear force and tensile force than castings.
The advantage of casting is that you can get to explore the honey out of the more complex shape, the cost is relatively low.
The advantage of forging is that the internal organization is uniform, there is no casting of porosity, inclusions and other harmful defects.
From the production process to distinguish between casting flange and forging flange, such as centrifugal flange belongs to a casting flange.

The forging process generally consists of the following procedures, i.e., selecting high-quality billets for discharging, heating, forming, and cooling after forging. Forging process methods are free forging, die forging and tire film forging. Production, according to the size of the quality of the forgings, the production of the number of batches of Xiqiqi buried to choose a different forging method.

Basic process: free forging, the shape of the forging is through a leg war enterprise worship some of the basic deformation process will be billet gradually forged.
The basic processes of free forging are upsetting, drawing, punching, bending and cutting.
1. Upsetting Upsetting is the operation process of forging the original billet along the axial direction so as to reduce its height and increase its cross-section. This process is commonly used in forging gear blanks and other disk-shaped forgings. Upsetting is divided into all upsetting and local forging two kinds.
2. Drawing length Drawing length is the forging process to increase the length of the blank and reduce the cross-section, usually used to produce shaft blanks, such as lathe spindles, connecting rods and so on.
3. Punching The forging process of punching out through-hole or non-through-hole with a punch on the billet.
4. Bending the billet into a certain angle or shape of the forging process.
5. Twisting A forging process in which one part of a billet is rotated at an angle relative to another part.
6. Cutting The forging process of dividing the billet or removing the head.

Die forging is known as model forging, the heated billet placed in the forging die fixed in the die forging equipment forging.
1.the basic process of die forging die forging process: material, heating, pre-forging, final forging, punching even skin, cutting edge, tempering, shot blasting. Commonly used processes are upsetting, elongation, bending, punching, molding.
2. Commonly used die forging equipment Commonly used die forging equipment are die forging hammer, hot die forging press, flat forging machine and friction press.
Commonly speaking, the quality of forged flange is better, generally produced by die forging, crystal organization is fine, high strength, of course, the price is also more expensive.
Whether casting flange or forging flange belongs to the flange commonly used manufacturing methods, depending on the strength requirements of the parts to be used, if the requirements are not high, you can also choose the turning system flange.