Forged pipe fittings is a product with better mechanical properties among flange products. Its raw material is generally pipe blanks, which are then cut and then hammered continuously to eliminate segregation, porosity and other defects in the ingot. Ordinary cast flanges are one grade higher.

Welded flanges can also be called forged pipe fittings, flat welded flanges and steam pipe flanges, which are used to connect carbon steel pipes with a nominal pressure not exceeding 2.5MPa. The connection form of the flat flange includes single-sided welding and double-sided nut connection. When welding, only one-sided welding is required, and there is no need to weld the inner hole and flange of the pipeline. Typically used for low and medium pressure pipelines.

The forging of forged pipe fittings can be divided into rotary forging, ring rolling and cross rolling according to the movement mode of the forging die, and rotary forging, rotary forging and ring rolling can also be used for precision forging. In order to improve the utilization rate of heat treatment, some complex forging processes are completed by one or more processes.

Forging method of forging pipe fittings: The forging of flat welded flanges can be divided into free forging and extrusion. Generally, the crystallization temperature area is called hot forging, and the unheated area at room temperature is called cold forging. When forging flat welding flanges at low temperature, the change of forging size has little effect. Forging below 700 degrees does not decarburize the surface, and has the advantage that it can be formed even if the forging force is small compared to the forging size. During machining, the flat weld flange will extend from near the die surface to the free surface, which makes it difficult to ensure accuracy. Products with complex shapes and high precision can be obtained at lower forging forces. Therefore, in order to better process products, such as the forging of large and various large turbine blades produced and operated by enterprises, the moving direction of the forging die and the swing forging process are controlled by computers.

Features of forged pipe fittings: Forged pipe fittings are a kind of movable flange. In fact, the flange is sleeved on the pipe end with steel rings, flanges, etc. So that the flange can move on the pipe end, flange or flange ring. This kind of flange is usually used for fittings of water supply and drainage pipes. When the factory leaves the factory, the two ends of the expansion joint are designed with flanges, and the pipeline and the equipment are directly connected with bolts in the project.

Forged pipe fittings not only save space and weight, but also ensure that the joint does not leak and has good sealing performance. Then, replace the flange gasket seal ring, making sure the sealing face matches the sealing face. Due to the reduced force-bearing area of ​​the forging, the size of the compact flange can be reduced due to the reduced diameter of the sealing ring, so that the cross-section of the sealing surface is continuously reduced. In this way, only a small amount of pressure is required to compress the sealing surfaces. As the pressure is reduced, the size of the bolts and the number of bolts required are reduced accordingly, resulting in a lightweight product design.

The quality of the forged pipe fittings is good. The main materials of the 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 is oiling and galvanizing. Forged pipe fittings have good pressure resistance and temperature resistance, and are usually suitable for high-pressure and high-temperature working environments.