MRC MH180 - Page 20

surface hardening
≥0.8mm ≥0.8mm ≥0.2mm ≥1.2mm ≥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
压痕深度
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: Tes t
large,
thick,heavy
and rough
surface steel
E: Test super
high
hardness
material
Table 4
No. Type Sketch of
non-conventional
Supporting ring
Remarks
1 Z10-15
For testing cylindrical outside
surface R10～R15
2 Z14.5-30
For testing cylindrical outside
surface R14.5～R30
3 Z25-50
For testing cylindrical outside
surface R25～R50
4 HZ11-13
For testing cylindrical inside
surface R11～R13
5 HZ12.5-17
For testing cylindrical inside
surface R12.5～R17
6 HZ16.5-30
For testing cylindrical inside
surface R16.5～R30
7 K10-15
For testing spherical outside
surface SR10～SR15
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