Versitron Operation Manual 77
10.6 Test Blocks Hardness Ranges (Indirect Verification)
Maximum Allowable repeatability and Error of
Testing Machines
for Ranges of Standardized Test Blocks
Range of Standardized
Test Blocks
A
Maximum
Repeatability, R
(HR units)
Maximum
Error, E
(HR units)
HRA
< 70 2.0 ± 1.0
$
70 and < 80
1.5 ±1.0
$
80
1.0 ±0.5
HRBW
< 60 2.0 ±1.5
$
60 and < 80
1.5 ±1.0
$
80
1.5 ±1.0
HRC
< 35 2.0 ±1.0
$
35 and < 60
1.5 ±1.0
$
60
1.0 ±0.5
HRD
< 51 2.0 ±1.0
$
51 and < 71
1.5 ±1.0
$
71
1.0 ±0.5
HREW
< 84 1.5 ±1.0
$
84 and < 93
1.5 ±1.0
$
93
1.0 ±1.0
HRFW
< 80 1.5 ±1.0
$
80 and < 94
1.5 ±1.0
$
94
1.0 ±1.0
HRGW
< 55 2.0 ±1.0
$
55 and < 80
2.0 ±1.0
$
80
2.0 ±1.0
HRHW
< 96 2.0 ±1.0
$
96
2.0 ±1.0
HRKW
< 65 1.5 ±1.0
$
65 and < 85
1.0 ±1.0
$
85
1.0 ±1.0
HRLW
B
2.0 ± 1.0
HRMW
B
2.0 ± 1.0
HRPW
B
2.0 ± 1.0
HRRW
B
2.0 ± 1.0
HRSW
B
2.0 ± 1.0
HRVW
B
2.0 ± 1.0
HR15N
< 78 2.0 ± 1.0
$
78 and < 90
1.5 ±1.0
$
90
1.0 ±0.7
HR30N
< 55 2.0 ±1.0
$
55 and < 77
1.5 ±1.0
$
77
1.0 ±0.7
HR45N
< 37 2.0 ±1.0
$
37 and < 66
1.5 ±1.0
$
66
1.0 ±0.7
HR15TW
< 81 2.0 ±1.5
$
81 and < 87
1.5 ±1.0
$
87
1.5 ±1.0
HR30TW
< 57 2.0 ±1.5
$
57 and < 70
1.5 ±1.0
$
70
1.5 ±1.0
HR45TW
< 33 2.0 ±1.5
$
33 and < 53
1.5 ±1.0
$
53
1.5 ±1.0
HR15WW
B
2.0 ± 1.0
HR30WW
B
2.0 ± 1.0
HR45WW
B
2.0 ± 1.0
HR15XW
B
2.0 ± 1.0
HR30XW
B
2.0 ± 1.0
HR45XW
B
2.0 ± 1.0
HR15YW
B
2.0 ± 1.0
HR30YW
B
2.0 ± 1.0
HR45YW
B
2.0 ± 1.0
A
The user may find that high, medium and low range test blocks are unavailable
commercially for some scales. In these
cases one or two standardized blocks
where available may be used. It is recommended that all high range test blocks for
Rockwell scales using a ball indenter should be less than 100 HR units.
B
Appropriate ranges of standardized test blocks for the L, M, P, R, S, V, W, X, and
Y scales shall be determined by dividing
the usable range of the scale into two ranges, if possible.
Chart reprinted from ASTM Handbook
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