P22 pipe cap

P22 pipe cap is a part mainly used to seal the tank body. During its entire manufacturing process, the operator may be worried about its heat treatment process. Because the temperature difference between the cooling speed and time of the surface layer and the inner layer is different during heating and cooling, it is easy to generate thermal stress and other problems. To avoid this situation as much as possible

Generally, the overall production process of P22 pipe cap equipment includes feeding, physicochemical, blanking, hot forging and heat treatment processes. During the heat treatment process, due to the change of composition and organization, the increase of specific volume will accompany the expansion of the workpiece volume, while the change of each part and time of the workpiece will lead to inconsistent volume changes, which will lead to the problem of organizational stress

When P22 pipe cap is subjected to heat treatment, the above two conditions will lead to stretching at the center of the workpiece and pressure on the surface, regardless of the offset or superposition effect. Therefore, the heat treatment process should be determined with great care

The temperature of P22 pipe cap shall be well controlled during manufacturing, and the protection against high surface temperature shall be determined according to the situation. If necessary, allowance shall be reserved for removing the oxide layer on the surface of pipe cap. According to the type, specification and material of the pipe cap, the pipe cap can be formed by cold stamping, hot stamping, cold spinning, hot spinning, cold coiling, hot coiling and other methods using a whole plate or a combination of plates; It can also be assembled and welded into a pipe cap after split forming. The atmosphere in the heating furnace is neutral or weakly oxidizing, and the heated flame should not directly contact the workpiece