MRC-2014Hot.svg - page 235

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 40～173 BRASS(copper-
zinc alloys) HRB 13.5～
95.3
BRONZE(copp
er-aluminium/ti
n alloys)
HB 60～290
Wrought copper
alloys HB 45～315
17
207