1-10 Issue 03, 04/2005 Krautkramer DynaPOCKET
Introduction Important information about hardness testing using the DynaPOCKET
Conversion of hardness values
The conversion of the HL value determined according
to the rebound method into standard hardness scales
is carried out on the basis of defined conversion tables
depending on the material group.
The conversion into tensile strength values is made
according to DIN 50150 on the basis of the HB values.
You should carry out conversions only
❚ if the specified test method cannot be applied (for
example because there is no suitable instrument
available),
❚ if it’s not possible to section the part to perform the
specified test method.
Please observe the limitations regarding the conver-
sion into DIN 50150.
A Attention:
Any illegal or unacceptable conversions may lead
to grave errors in the interpretation of measure-
ment results.
A Attention:
It is absolutely necessary that you set your
DynaPOCKET to the appropriate material group
before testing (ref. chapter 3.4).
The material group for low-alloy or unalloyed steel is
defined as default setting in the instrument.
Please also read chapter 7 on the rebound method.
A Attention:
You should not carry out hardness measurements
twice at the same test position, otherwise faulty mea-
surements are possible due to the surface hardening.
The distance between the test positions should be at
least 3 mm.
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