MRC MH180 - Page 18

APPENDIX
Table 1
Impact device
Material Method
D/DC D+15 C G E DL
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
Steel and cast
steel
HS
32.2～
99.5
33.3～
99.3
31.8～
102.1
35.8～
102.6
30.6～
96.8
HRC
20.4～
67.1
19.8～
68.2
20.7～
68.2
22.6～70.2
Cold work
tool steel
HV 80～898 80～935
100～
941
82～1009
HRB
46.5～
101.7
HB 85～655
Stainless steel
HV 85～802
HRC
HB 93～334 92～326
Grey cast iron
HV
HRC
HB
131～
387
127～
364
Nodular cast
iron
HV
HB 19～164 23～210 32～168
Cast aluminium
alloys
HRB
23.8～
84.6
22.7～
85.0
23.8～
85.5
HB 40～173BRASS(copper-
zinc alloys)
HRB
13.5～
95.3
BRONZE(copp
er-aluminium/ti
n alloys)
HB 60～290
Wrought copper
alloys
HB 45～315
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