The whole process video of flange forging

Forged flange is one of the products with the best mechanical properties in flange products. Its raw material is generally round bar, and then it is cut and hammered continuously to eliminate segregation, looseness and other defects in ingot. The price and mechanical properties are one grade higher than that of common cast flange. Flange is the part that connects the pipe with the pipe and the valve, and is connected to the pipe end; it is also useful for the flange on the inlet and outlet of the equipment, and is used for the connection between the two equipment, which is the part that connects the pipe with the pipe, and is connected to the pipe end. It is a kind of accessory product of pipeline. The main materials of forged flange are carbon steel, alloy steel and stainless steel. The main standards are national standard, electric standard, American Standard, German standard, Japanese standard, etc. The main anti-corrosion treatment includes oiling and galvanizing. Forged flange has good pressure and temperature resistance, which is generally suitable for high pressure and high temperature working environment.


Carbon steel
ASTM A105, ASTM A350 LF1, LF2 CL1 / Cl2, LF3 CL1 / Cl2, ASTM a694 F42, F46, F48, F50, f52, f56, F60, F65, F70
Stainless steel
ASTM A182 f304 / 304L, F316 / 316L, f316h, F310, f321 f44 (UNS s31254)
Alloy steel
ASTM A182 F1, f5a, F9, F11, F12, F22, F91
Duplex steel / super duplex steel
ASTM A182 F51 / UNS S31803, F53 / UNS S32750, F55 / UNS s32760
Special alloy steel
Monel 400, Inconel 600, Inconel 625, Incoloy 800, Incoloy 825, Hastelloy C276

Production technology of flange blank

The production technology of flange blank mainly includes forging and casting.
The shape and size of the casting flange blank are accurate, the machining amount is small and the cost is low, but there are casting defects (porosity, crack and inclusion); the internal structure streamline of the casting is poor (if it is a cutting part, the streamline is worse);
Forged flange is generally lower carbon content than cast flange and is not easy to rust. The forging has good streamline, compact structure and better mechanical properties than cast flange.
If the forging process is not proper, there will be large or uneven grains, hardening cracks, and the forging cost is higher than that of casting flange.
Forgings can bear higher shear force and tensile force than castings.
The advantages of the casting are that it can make a more complex shape and the cost is relatively low.
The forging has the advantages of uniform internal structure and no harmful defects such as pores and inclusions in the casting.
The difference between casting flange and forging flange is different from the production process. For example, centrifugal flange is one of the casting flange.
Centrifugal flange is a kind of flange produced by precision casting. Compared with ordinary sand casting, the structure of centrifugal flange is much finer and its quality is improved. It is not easy to have loose structure, porosity, sand hole and other problems.

Production process of centrifugal flange blank:

  • ① put the selected raw material steel into medium frequency electric furnace for smelting, so that the temperature of molten steel can reach 1600-1700 ℃;
  • ② preheat the metal mould to 800-900 ℃ and keep constant temperature;
  • ③ start the centrifuge, inject the steel water in step ① into the metal mold after preheating in step ②;
  • ④ the casting is naturally cooled to 800-900 ℃ and kept for 1-10 minutes;
  • ⑤ cool with water to near normal temperature, demould and take out the casting.

Production process of forging flange blank:

Select high-quality billet blanking, heating, forming, cooling after forging. The forging process includes free forging, die forging and tire die forging. During production, different forging methods are selected according to the forging quality and production batch.
One. Free forging
Basic process: during free forging, the shape of forgings is gradually forged into blanks through some basic deformation processes. The basic process of free forging includes upsetting, drawing, punching, bending and cutting.
1. Upsetting
Upsetting is the process of forging the original billet along the axial direction to reduce its height and increase its cross section. This process is often used to forge gear blanks and other disc forgings. Upsetting can be divided into full upsetting and partial upsetting.
2. Drawing length
Drawing length is a forging process that increases the length of the blank and reduces the cross-section. It is usually used to produce shaft blank, such as lathe spindle, connecting rod, etc.
3. Punching
The forging process of punching through or through holes in a blank with a punch.
4. Bending
A forging process in which the blank is bent to an angle or shape.
5. Twist
A forging process in which one part of a billet is rotated at an angle to the other.
6. Cutting
The forging process of cutting blank or cutting head.
Two. Die forging
Die forging is called model forging. The heated blank is placed in the forging die fixed on the die forging equipment for forging.
1. Basic process of die forging
Die forging process: blanking, heating, pre forging, final forging, punching, trimming, tempering, shot peening. Common processes include upsetting, drawing, bending, punching and forming.
2. Common die forging equipment
Common die forging equipment includes die forging hammer, hot die forging press, flat forging machine and friction press, etc.
Generally speaking, the quality of forged flange is better. Generally, it is produced by die forging, with fine crystal structure, high strength and high price.

Both cast flange and forged flange are common manufacturing methods of flange. According to the strength requirements of components to be used, if the requirements are not high, turning flange can also be selected.

Source: China Flange Manufacturer – Yaang Pipe Industry (

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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The whole process video of flange forging
Forged flange is one of the products with the best mechanical properties in flange products. Its raw material is generally round bar, and then it is cut and hammered continuously to eliminate segregation, looseness and other defects in ingot.
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