Spain has a well established and rich knifemaking tradition, especially in cities like Toledo, Albacete, Ciudad Real, Granada, Jaén, Valencia and Seville, whose blades are known worldwide.

Without going into detail, because it is a complex subject that requires knowledge of chemistry and physical-chemistry, it is necessary to know that crystalline grains structure of the steel is closely related to the temperature at which the material is treated and with its cooling speed.