5
Max. hardness of
workpiece
940HV
940HV
1000HV
650HB
1200HV
Mean roughness of
workpiece surface of
the Ra
1.6
μ
m
1.6
μ
m
0.4
μ
m
6.3
μ
m
1.6
μ
m
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 harden
5mm
≥
0.8mm
5mm
≥
0.8mm
1mm
≥
0.2mm
10mm
≥
1.2mm
5mm
≥
0.8mm
Size of tip indentation
Hardness
300HV
Indentation
diameter 0.54mm
0.54mm
0.38mm
1.03mm
0.54mm
Indentation
depth
24
μ
m
24
μ
m
12
μ
m
53
μ
m
24
μ
m
Hardness
600HV
Indentation
diameter 0.54mm
0.54mm
0.32mm
0.90mm
0.54mm
Indentation
depth
17
μ
m
17
μ
m
8
μ
m
41
μ
m
17
μ
m
Hardness
800HV
Indentation
diameter 0.35mm
0.35mm
0.35mm
--
0.35mm
Indentation
depth
10
μ
m
10
μ
m
7
μ
m
--
10
μ
m
Available type of
impact device
D:
General test
DC:
Hole or
hollow-cylind
rical test
DL:
Slender
narrow
groove or
hole test
D+15:
groove or
reentrant
surface
C:
small, light,
thin parts
or surface
of hardend
layer
G:
large, thick,
heavy or
rough
surface
steel
E:
super high
hardness
material
