What are the differences between cold forging and hot forging of slip-on flanges?

Cold forging of slip-on flanges is a process of forging at low temperature, and the size of slip-on flanges changes little. When forged below 700 C, less oxide scales are formed and no decarbonization occurs on the surface. Therefore, as long as the deformation energy is within the range of forming energy, cold forging can easily obtain good dimensional accuracy and surface finish. As long as temperature and lubrication cooling are well controlled, warm forging below 700 C can also achieve good accuracy. Cold die forging, cold extrusion, cold upsetting and other plastic processing. Cold forging is a forming process below the recrystallization temperature of the material and a forging process below the recovery temperature. Cold forging has good surface quality and high dimensional accuracy, which can replace some cutting processes. Cold forging can strengthen metal and improve the strength of DIN2502 RF Pn16 Stainless Steel Slip-on Flange.

　　The development of cold forging technology is mainly to develop high value-added products and reduce production costs. At the same time, slip-on flanges is constantly infiltrating into or replacing cutting, powder metallurgy, casting, hot forging, sheet metal forming process and other fields. It can also be combined with these processes to form a composite process.

　　Hot forging of slip-on flanges is: in hot forging, large slip-on flanges with complex shapes can be forged because the deformation energy and resistance are very small. To obtain slip-on flanges with high dimensional accuracy, hot forging can be used in the temperature range of 900-1000 C. In addition, attention should be paid to improving the working environment of hot forging. The life of forging die is shorter than that of forging in other temperature domains, but it has higher freedom and lower cost. The main purpose of hot forging slip-on flanges is to reduce the deformation resistance of metal, thus reducing the forging pressure required for bad material deformation and greatly reducing the tonnage of forging equipment; changing the as-cast structure of steel ingot used for slip-on flanges, recrystallizing in the process of hot forging, the coarse as-cast structure becomes a new structure with fine grains, and reducing the defects of as-cast structure and improving the mechanical properties of steel.