Residual heat of heavy forgings

Let's talk about the heat treatment of heavy forgings directly after forging by using the heat of forgings themselves. That is, the process of reheating forgings before heat treatment after forging is omitted from the heat treatment of forgings. Generally, there are several methods of heat treatment by waste heat.

1、 After forging, conduct residual heat soaking heat treatment. After forming, the forgings are directly sent to the heat treatment furnace, which is still carried out according to the conventional heat treatment process. After homogenizing, the temperature of different parts of the forgings can shorten the holding time. This method is called waste heat homogenizing heat treatment. For the forgings with complex shape and large section change, the quality of forgings can be stable by using this process.

2、 Direct waste heat heat treatment after forging. After forging is formed, the forging waste heat is directly used for heat treatment, which closely combines forging and heat treatment, saving a lot of energy consumption waste caused by reheating of ordinary heat treatment.

3、 After forging, use part of the waste heat for heat treatment. After forming, the forgings shall be cooled to about 600~650 ℃, and then heated to the required temperature for heat treatment. This method can refine the grains and save the energy consumption of heating forgings from room temperature to 600~650 ℃. It is generally applicable to forgings with high requirements for grain size. A large number of application examples show that, through reasonable control of cooling parameters after forging forming, the structure and properties of forgings after heat treatment with residual heat can reach the level of ordinary heat treatment, with good process stability and reproducibility. The waste heat is used for heat treatment, which saves the heating procedure in the heat treatment process, saves energy, and the investment and maintenance cost of heat treatment equipment. Forging industry is a major energy consumer, and forging heat treatment is a major energy consumer in forging production, accounting for 30%~35% of the total energy consumption in the whole forging production. The energy consumption of forgings accounts for about 8%~10% of the cost of forgings. The energy consumption cannot meet the production cost of forgings. The economic benefits of enterprises. In addition, the energy problem is a major issue related to sustainable development and survival. Therefore, it is obvious to use forging waste heat for heat treatment in terms of energy saving, consumption reduction, efficiency, etc., which not only saves energy, shortens the process flow, but also protects the environment.