19
Table 3
Type of impact device
DC(D)/DL
D+15
C
G
E
Impacting energy
Mass of impact body
11mJ
5.5g/7.2g
11mJ
7.8g
2.7mJ
3.0g
90mJ
20.0g
11mJ
5.5g
Test tip hardness:
Dia. Test tip:
Material of test tip:
1600HV
3mm
Tungsten
carbide
1600HV
3mm
Tungsten
carbide
1600HV
3mm
Tungsten
carbide
1600HV
5mm
Tungsten
carbide
5000HV
3mm
synthetic
diamond
Impact device diameter:
Impact device length:
Impact device weight:
20mm
86(147)/
75mm 50g
20mm
162mm
80g
20mm
141mm
75g
30mm
254mm
250g
20mm
155mm
80g
Max. hardness of sample
940HV
940HV
1000HV
650HB
1200HV
Mean roughness value of
sample surface Ra:
1.6μm
1.6μm
0.4μm
6.3μm
1.6μm
Min. weight of sample:
Measure directly
Need support firmly
Need coupling tightly
>5kg
2
～
5kg
0.05
～
2kg
>5kg
2
～
5kg
0.05
～
2kg
>1.5kg
0.5
～
1.5kg
0.02
～
0.5kg
>15kg
5
～
15kg
0.5
～
5kg
>5kg
2
～
5kg
0.05
～
2kg
Min. thickness of sample
Coupling tightly
Min. layer thickness for
surface hardening
5mm
≥0.8mm
5mm
≥0.8mm
1mm
≥0.2mm
10mm
≥1.2mm
5mm
≥0.8mm
Size of tip indentation
Hardness
300HV
Indentation
diameter
Depth of
indentation
0.54mm
24μm
0.54mm
24μm
0.38mm
12μm
1.03mm
53μm
0.54mm
24μm
Hardness
600HV
Indentation
diameter
Depth of
indentation
0.54mm
17μm
0.54mm
17μm
0.32mm
8μm
0.90mm
41μm
0.54mm
17μm
Hardness
800HV
Indentation
diameter
Depth of
indentation
0.35mm
10μm
0.35mm
10μm
0.35mm
7μm
--
--
0.35mm
10μm
Available type of impact
device
DC: Test hole
or hollow
cylindrical;
DL:Testslender
narrow groove
or hole
D
+15: Test
groove
or
reentran
t surface
C: Test
small,light,thi
n parts and
surface of
hardened
layer
G:
Test
large,
thick,heavy
and rough
surface steel
E:
Test super
high
hardness
material
