22
Table 3
Type
of
impact
device
D/DL
C
Impacting
energy
Mass
of
impact
body
11mJ
5.5g/7.2g
2.7mJ
3.0g
Test
tip
hardness:
Dia.
Test
tip:
Material
of
test
tip:
1600HV
3mm
Tungsten carbide
1600HV
3mm
Tungsten carbide
Impact
device
diameter:
Impact
device
length:
Impact
device
weight:
20mm
86(147)/ 75mm 50g
20mm
141mm
75g
Max.
hardness
of
sample
940HV
1000HV
Mean
roughness
value
of
sample
surface
Ra:
1.6μm
0.4μm
Min.
weight
of
sample:
Measure
directly
Need
support
firmly
Need
coupling
tightly
>5kg
2
～
5kg
0.05
～
2kg
>1.5kg
0.5
～
1.5kg
0.02
～
0.5kg
Min.
thickness
of
sample
Coupling
tightly
Min.
layer
thickness
for
surface
hardening
5mm
≥0.8mm
1mm
≥0.2mm
Size
of
tip
indentation
Hardness
300HV
Indentation
diameter
Depth
of
indentation
0.54mm
24μm
0.38mm
12μm
Hardness
600HV
Indentation
diameter
Depth
of
indentation
压痕深度
0.54mm
17μm
0.32mm
8μm
Hardness
800HV
Indentation
diameter
Depth
of
indentation
0.35mm
10μm
0.35mm
7μm
Available
type
of
impact
device
DC: Test hole or hollow
cylindrical;
DL:Testslender narrow
groove or hole
C: Test small,light,
thin parts and
surface of hardened
layer
