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17
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
~
651
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
~
102.1
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
~
941
82
~
1009
Stainless steel
HRB
46.5
~
101.7
HB
85
~
655
HV
85
~
802
Grey cast iron
HRC
HB
93
~
334
92
~
326
HV
Nodular cast iron
HRC
HB
131
~
387
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-z
inc alloys)
HB
40
~
173
HRB
13.5
~
95.3
BRONZE(copper
-aluminum/tin
alloys)
HB
60
~
290
Wrought copper
alloys
HB
45
~
315