Metal parts that are subject to friction, torsion, bending, etc. must possess high hardness, but they must have this property only on the surface, as the excess hardness inside the part is undesirable. Parts are exposed to the surface hardening to achieve these metal properties; only the surface layer is hardened to a certain temperature with the quick subsequent cooling, and the core of the part retains its initial properties.
The surface layer of a metal part can be effectively heated by high-frequency currents (HFC). This procedure gives the metal the high mechanical friction and abrasion resistance; therefore, the HFC surface hardening is one of the most effective methods, which meets the modern mass production requirements and gives the metal different hardening degrees through heat treatment.
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