Are all forgings tempered after forging?

October 25, 2024common problems News 8480

Forgings are not always tempered after forging.

Whether or not forgings need to be tempered during the manufacturing process depends on their specific application requirements and performance needs. Tempering is a heat treatment process designed to improve the comprehensive mechanical properties of steel materials, through the quenching and then high temperature tempering treatment, so that the steel parts to obtain a good match of strength and toughness. For some important structural parts, especially those that need to work under alternating loads, the tempering treatment is necessary because it can provide high strength and excellent toughness, plasticity, cutting properties, etc.

However, not all forgings require tempering. For example, some forgings may be able to meet performance requirements by normalizing them directly after forging, especially for parts that do not have high performance requirements. In addition, some customers may believe that the hardness of a forging is sufficient and that no further tempering is required, but this approach ignores factors such as tissue changes and stress relief.

In recent years, in order to save energy and reduce manufacturing costs, countries have developed mechanical structural steels that do not require tempering heat treatment, i.e. non-tempered mechanical structural steels. These steels are "micro-alloyed" by adding very small amounts of special elements to carbon and alloy structural steels to stop grain growth and strengthen material properties. These materials excel in continuous cooling precipitation strengthening, especially carbide and nitride strengthening at V.

In summary, the need for tempering of forgings depends on their specific application scenario and performance requirements. For parts that require good overall mechanical properties and operate under alternating loads, tempering is necessary. However, for parts that do not have high performance requirements or parts that can meet the requirements through other heat treatment methods, tempering may not be necessary.

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