In order to manufacture drills, a tool steel is required that best meets the requirements of the application. For the production of drilling tools for metal cutting, high speed steel is used.
Steels are generally divided into structural and tool steels. Tool steels are used, among other purposes, for cutting hand and machine tools. All tool steels are stainless steels.
Heat treatment gives tool steels their working hardness (hot hardness and strength). This treatment influences the many properties (e.g. hot hardness, application temperature, tensile strength, wear resistance) of the tool steel and adapts it for specific applications. When increasing hardness, for example, the toughness decreases. Here it must be considered which property significantly influences the tool life depending on the application.
Tool steels are characterized according to
their composition (unalloyed and alloyed)
the cooling agents (water, oil and air hardeners) and
the application temperature (cold work, hot work and high speed steel).
The application temperature is differentiated between cold work steel (unalloyed) and hot work steel (alloyed). Cold work steels are usually used when the application temperature at the surface does not exceed 200 °C during use. On the other hand, application temperatures of more than 200 °C occur with hot work steels.
A special class of these hot work steels are high speed steels (HSS), in which the application temperature can rise to over 600 °C.
Post time: Dec-08-2021