20
APPENDIX
Table 1
Material
Method
Impact device
D
C
DL
Steel and cast steel
HRC
20
~
68.5
20.0
~
69.5
20.6
~
68.2
HRB
38.4
~
99.6
37.0
~
99.9
HRA
59.1
~
85.8
HB
127
~
651
80
~
683
81
~
646
HV
83
~
976
80
~
996
80
~
950
HS
32.2
~
99.5
31.8
~
102.1
30.6
~
96.8
Cold work
tool steel
HRC
20.4
~
67.1
20.7
~
68.2
HV
80
~
898
100
~
941
Stainless steel
HRB
46.5
~
101.7
HB
85
~
655
HV
85
~
802
Grey cast iron
HRC
HB
93
~
334
HV
Nodular cast iron
HRC
HB
131
~
387
HV
Cast aluminum alloys
HB
19
~
164
23
~
210
HRB
23.8
~
84.6
22.7
~
85.0
BRASS(copper‐zinc
alloys)
HB
40
~
173
HRB
13.5
~
95.3
BRONZE(copper‐alumi
num/tin alloys)
HB
60
~
290
Wrought copper alloys
HB
45
~
315