Precipitation hardening steels are special alloys that, thanks to a heat treatment, develop exceptional properties, including high mechanical strength and significant hardness. The term “precipitation” refers to a metallurgical process in which certain alloying elements (such as copper, aluminum, or nickel) are dissolved within the metal matrix. During heat treatment, these elements separate and form small particles that “precipitate” within the material’s structure, thus improving its mechanical properties. This process enhances the steel’s strength and hardness, making it particularly useful for applications requiring high performance, such as engine components, cutting tools, and structures that operate in extreme environments. Precipitation hardening steels are used in sectors such as aerospace, automotive, and energy industries, where the combination of strength, hardness, and toughness is crucial. These steels are also known for their dimensional stability and resistance to plastic deformation under high loads.