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Hardness is one measure that
helps determine how tough a
particular material grade
will machine under shop
conditions. Converting
reading from Rockwell,
Vickers, Knoop or Brinell to
a general approximation
between these hardness
values can be helpful.
ASTM E-140-07 which is the
"Standard Hardness
Conversion Tables for Metals
Relationship Among Brinell
Hardness, Vickers Hardness,
Rockwell Hardness,
Superficial Hardness, Knoop
Hardness and Scleroscope
Hardness". In this
specification ASTM has nine
(9) conversion charts
depending on material type
being converted.
Table 1 presents data in a
Rockwell C Hardness range
for non-austenitic steels
including carbon, alloy and
tool steels in the as
forged, annealed,
normalized, and quench and
tempered conditions provided
the material being tested is
homogeneous. This
table would be consistent
with material grades being
used for cylinder
applications using carbon or
alloy steels.
Table 2. presents data in a
Rockwell B hardness range.
Again this is for
non-austenitic steels
including carbon, alloy and
tool steels in the as
forged, annealed,
normalized, and quench and
tempered conditions provided
the material being tested is
homogeneous. This
table would also be
consistent with material
grades being used for
cylinder applications using
carbon or alloy steels.
Table 3 is a hardness
conversion chart for nickel
and high nickel alloys with
a nickel content over 50%.
Table 4 is for superficial
hardness of cartridge brass.
Table 5 austenitic stainless
steel plate. Table 6
superficial hardness of
austenitic stainless steel
sheet. Table 7 for
Copper no 102 through 142
inclusive. Table 8
alloyed white iron.
Table 9 wrought aluminum
products.
Table 1 Rockwell C Hardness
Range Conversion Table Link
Table 2 Rockwell B Hardness
Range Conversion Table Link
ASTM E-140-07 Standard can
be found at the ASTM store
located at:
http://www.astm.org/Standards/E140.htm
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