In steam turbines, bolt GB987-88 is a commonly used connecting element. It not only withstands fastening force, but also needs to withstand various loads and stresses. In order to improve the performance of bolts and ensure their stable operation in high-strength and high-pressure environments, the heat treatment process has become an important technical means. Through appropriate heat treatment, the strength and toughness of the bolt can be significantly increased, and its wear resistance and fatigue strength can be improved, thereby extending the service life of the bolt.

The heat treatment process of bolts mainly includes quenching and tempering treatment, normalizing treatment, surface hardening treatment and high temperature tempering. These processes use heating and cooling to change the grain structure and properties of the bolt. Specifically, the quenching and tempering treatment improves the hardness and strength of the bolt through quenching and tempering, while increasing the toughness; the normalizing treatment improves the overall strength and toughness of the bolt by homogenizing the grain structure; the surface hardening treatment improves the overall strength and toughness of the bolt. A hardened layer is formed on the surface to improve its wear resistance and fatigue strength; while high-temperature tempering further improves toughness and reduces brittleness while maintaining a certain strength.

In practical applications, the selection and parameter setting of the heat treatment process are crucial. The type and extent of heat treatment needs to be determined based on the material, design requirements and service conditions of the bolt. For example, for steam turbine high-pressure rear shaft sealing bolts that are subject to high pressure and temperature, it is usually necessary to use quenching and tempering treatment or surface hardening treatment to improve its performance. For some special alloy bolts, high temperature tempering may be required to further improve their toughness and strength.

In addition, heat-treated bolts should undergo appropriate inspection and testing to ensure that they perform as expected. This includes testing the hardness, toughness, grain structure, etc. of the bolts to ensure the quality and effectiveness of the heat treatment process.

In short, the heat treatment process of bolts is an effective technical means that can significantly improve the strength and toughness of bolts, improve their wear resistance and fatigue strength, thereby extending the service life of bolts. In practical applications, appropriate heat treatment processes and parameters should be selected based on the material and design requirements of the bolts to ensure the stable operation of the bolts in high-temperature and high-pressure environments.

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