How hard is the TRD Carbide layer and how can it be measured?
Vanadium carbide layer is measured at approximately Hv 3,200-3,800; Chrome carbide (Cr23, C6, Cr7C3C) measures approximately Hv 2,500. It is considered to be an appropriate value since those values are almost equivalent to the hardness of the carbide grains contained in the tool steel material. It is always very difficult to measure such a thin layer with such an extremely high hardness.
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