Why is high strength steel destroyed under certain conditions?

High strength steel can be significantly affected by temperature and time when it is exposed to welding or other heat-generating processes. When the material is subjected to excessive heat for prolonged periods, its metallurgical structure can undergo changes that negatively impact its mechanical properties. This can lead to issues such as loss of ductility or stress-cracking, which severely compromises the integrity and strength of the steel.

In the context of high strength steels, the balance of alloying elements and the heat treatment they undergo is crucial for maintaining desired properties. When the temperature exceeds specific limits or if the steel is held at elevated temperatures for too long, it can transition from a hardened state to one that is softer and more susceptible to deformation and failure. Therefore, maintaining strict control over these factors is essential in applications involving high strength steel, particularly in the automotive and structural industries.