7-4 Issue 03, 04/2005 Krautkramer DynaPOCKET
The rebound hardness testing method Conversion of hardness values
Please take into account with the steel material groups
that the hardness values situated in the lower hard-
ness ranges (up to approx. 500 HL) are less material-
dependent than those in the upper ranges. Please
check the calibration of your instrument, in particular
if the hardness values in question are situated above
500 HL.
You will find the conversion options available for the
individual material groups stored in the DynaPOCKET
in the overview given on the next page. Due to the
higher material dependence, converted hardness val-
ues show considerably larger differences in the upper
hardness ranges.
Material groups
Code designation Material group
St Low-alloy/unalloyed steel and cast steel
ASt Tool steel
SSt Corrosion-resistant steel
GCI Gray cast iron
NCI Nodular graphite cast iron
AL Aluminum cast alloys
brS Brass
brZ Bronze
Cu Wrought copper alloys
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