Table 2
No.
Material
HLD
Strength
σ
b
(MPa)
1
Mild steel
350
～
522
374
～
780
2
High-Carbon steel
500
～
710
737
～
1670
3
Cr steel
500
～
730
707
～
1829
4
Cr-V steel
500
～
750
704
～
1980
5
Cr-Ni steel
500
～
750
763
～
2007
6
Cr-Mo steel
500
～
738
721
～
1875
7
Cr-Ni-Mo steel
540
～
738
844
～
1933
8
Cr-Mn-Si steel
500
～
750
755
～
1993
9
Super strength steel
630
～
800
1180
～
2652
10
Stainless steel
500
～
710
703
～
1676
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:
1.6
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
5mm
5mm
1mm
10mm
5mm
18
208
