APPENDIX
Table 1
Material Method
Impact device
D/DC D+15 C
G
E
DL
Steel and cast
steel
HRC 20 68.5
19.3 67
.9
20.0 69
.5
22.4 70.7
20.6 68
.2
HRB
38.4 99
.6
47.7 99.
9
37.0 99
.9
HRA
59.1 85
.8
61.7 88.0
HB
127 65
1
80 638 80 683 90 646 83 663 81 646
HV 83 976
80 937
80 996 84 1042
80 950
HS
32.2 99
.5
33.3 99
.3
31.8 10
2.1
35.8 102.
6
30.6 96
.8
Cold work
tool steel
HRC
20.4 67
.1
19.8 68
.2
20.7 68
.2
22.6 70.2
HV 80 898
80 935
100 94
1
82 1009
Stainless steel
HRB
46.5 10
1.7
HB 85 655
HV 85 802
Grey cast iron
HRC
HB 93 334
92 326
HV
Nodular cast
iron
HRC
HB
131 38
7
127 364
HV
Cast aluminum
alloys
HB 19 164 23 210
32 168
HRB
23.8 84
.6
22.7 85
.0
23.8 85.
5
BRASS(copper-
zinc alloys)
HB 40 173
HRB
13.5 95
.3
BRONZE(copp
er-aluminum/tin
alloys)
HB 60 290
Wrought copper
alloys
HB 45 315
