3
Material
Hardness
method
Impact device
D/DC
D+15
C
G
E
DL
Gray 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(copp
er-zinc
alloys)
HB
40
~
173
HRB
13.5
~
95.3
Bronze
(copper-alu
minum/cop
per-tin
alloys)
HB
60
~
290
Wrought
copper
alloys
HB
45
~
315
Table 2
No.
Material
HLD
Strength
σ
b
(MPa)
1
Mild steel
350
~
522
374
~
780
2
High-carbon steel
500
~
710
737
~
1670
3
Cr steel
500
~
730
707
~
1829
4
Cr-V steel
500
~
750
704
~
1980
5
Cr-Ni steel
500
~
750
763
~
2007
6
Cr-Mo steel
500
~
738
721
~
1875
7
Cr-Ni-Mo steel
540
~
738
844
~
1933
8
Cr-Mn-Si steel
500
~
750
755
~
1993
9
Super strength steel
630
~
800
1180
~
2652
10
Stainless steel
500
~
710
703
~
1676