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3.3.1.4 Test Conditions
To ensure proper hardness readings, the following conditions must be fulfilled. If one or more conditions are not met, the measurement result may be
significantly false.
Impact device type
Surface
Roughness grade class ISO 1302
preparation
Max. roughness depth R
Average roughness R
Minimum sample
Of compact shape (kg / lbs)
mass
On solid support (kg / lbs)
Coupled on plate (kg / lbs)
Minimum sample
Uncoupled (mm / inch)
thickness
Coupled (mm / inch)
Surface layer thickness (mm / inch)
Minimum space
Between indentation and sample edge
(mm/inch)
Between indentations (mm/inch)
Indentation size on
With 300 HV,
test surface
30 HRC
With 600 HV,
55 HRC
With 800 HV,
63 HRC
Table 1:
Leeb Test Piece Requirements
14
D/DC/DL/S/E
N7
(μm / μinch)
10 / 400
t
(μm / μinch)
2 / 80
a
5 / 11
2 / 4.5
0.05 / 0.2
25 / 0.98
3 / 0.12
0.8 / 0.03
5 / 0.2
3 / 0.12
Diameter (mm / inch)
0.54 / 0.021
Depth (μm / μinch)
24 / 960
Diameter (mm / inch)
0.45 / 0.017
Depth (μm / μinch)
17 / 680
Diameter (mm / inch)
0.35 / 0.013
Depth (μm / μinch)
10 / 400
G
C
N9
N5
30 / 1200
2.5 / 100
7 / 275
0.4 / 16
15 / 33
1.5 / 3.3
5 / 11
0.5 / 1.1
0.5 / 1.1
0.02 / 0.045
70 / 2.73
15 / 0.59
10 / 0.4
1 / 0.04
0.2 / 0.008
8 / 0.3
4 / 0.16
4 / 0.16
2 / 0.08
1.03 / 0.04
0.38 / 0.015
53 / 2120
12 / 480
0.9 / 0.035
0.32 / 0.012
41 / 1640
8 / 2560
0.30 / 0.011
7 / 280
© 2016 Proceq SA
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