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A Rockwell hardness measurement is reported as a Rockwell hardness
number, without units. The Rockwell hardness number is calculated from
the difference in the indentation depths before and after application of the
total force, while maintaining the preliminary test force. The difference in
indentation depths is measured as h as described above. The calculation of
the Rockwell hardness number is dependent on the specific combination of
indenter type and the forces that are used.
For scales that use a ball indenter, the Rockwell hardness number is calculated
from h (in mm) as:
Regular Rockwell Hardness=-130 0 002 h/mm
Rockwell Superficial Hardness=-100 0 001 h/mm
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