How to deal with the problem of high hot temperature of forgings in forging plant?

DataTime:[2024-2-23]

In modern manufacturing, quality control of forgings is a critical part of ensuring product durability and performance. Especially for forgings made of high carbon and high alloy steel materials, after forging and forming, strict temperature control measures must be taken to avoid surface cracking in the cooling process.

high hot temperature of forgings in forging plant

When the forging in the high temperature state after the completion of the molding process, according to the characteristics of the material and product application requirements, can be used to pile cooling, furnace cooling, buried sand cooling or furnace baking slow cooling and other different cooling methods. These methods in reducing the temperature at the same time, to ensure that the temperature of the forging piece uniformly decreased, to avoid the rapid cooling caused by thermal stress and uneven organization. Heap cooling is accumulated in the air for natural cooling, furnace cooling is in the closed heat treatment furnace slowly cooled down to room temperature, buried sand cooling is the hot forging buried in the sand slowly cooled. After that, the forgings should be heat-treated according to the process requirements in a timely manner, in order to obtain the final desired organization and properties.

Take flange forgings as an example, flange forgings are key parts widely used in industrial machinery. Forged flanges made of high-strength materials such as 42CrMo will have significant improvement in wear resistance and strength after good heat treatment. The standard heat treatment process includes normalizing and tempering, which makes the hardness reach HB 240-280, followed by surface quenching until the hardness is increased to HRC 45-50. in the harsh working environment or high-frequency use of occasions, such as South Korea can be adopted by the development of the whole spray quenching technology, the quenching depth increased to 15-20mm. compared with the domestic quenching depth of 3-8mm, can significantly improve the service life of the flange forgings. Improve the service life of flange forgings.

Austenitic stainless steel forgings should be water-cooled immediately after release from the furnace, which is to lock its organizational characteristics to prevent grain growth or undesired phase precipitation. Then solid solution treatment to obtain excellent mechanical properties and corrosion resistance. Flange forgings as an important part of the transmission system, with superior vibration absorption and the ability to adapt to harsh environments, in high-speed, heavy loads, as well as high temperatures and other harsh conditions of reliable work.

For those who have not been affected by overheating in the low carbon steel and low alloy steel forgings, usually must be taken to the air-cooled way to deal with. This is to ensure that the forging in the cooling process of uniformity, to avoid abnormal grain growth and uneven organization and performance. The surface temperature of the forging before entering the heat treatment furnace should be maintained above 50°C to avoid the generation of white spots and to ensure the integrity and performance of the final product.

It should be noted that in the process of forging processing, the phenomenon of overheating can cause grain coarsening, resulting in a decline in mechanical properties. For this problem, general heat treatment can restore the organizational state and properties, but for some special alloy steel materials, severe overheating may not be fully recovered by conventional heat treatment. Therefore, in forging production, it is crucial to control the heating temperature and time to avoid the occurrence of overheating.

In short, the forging plant must take fine temperature control and heat treatment process to improve the cutting and use performance of forgings and ensure the overall quality of the product. And in the heat treatment process, the specific requirements of different types of forging materials and parts also require forging plants to have a detailed understanding of these processes and strict implementation, in order to effectively control the final quality of the product.

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