The tool must often be harder, more durable and wear resistant than the material it processes. Therefore, the materials used for tool manufacturing must have as high hardness and strength as possible, but with sufficient ductility, in accordance with the conditions of the place of use, with a few exceptions. Especially in tools that perform separation work, form and change form, and are subjected to impact or impact in agriculture, very high hardness, good wear resistance, as well as high ductility and safety against breaking at the highest hardness that can be achieved are required.