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Material
|
Hardness method
|
Impact device
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|||||
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D/DC
|
D+15
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C
|
G
|
E
|
DL
|
||
|
Steel and cast steel
|
HRC
|
17.9～68.5
|
19.3～67.9
|
20.0～69.5
|
|
22.4～70.7
|
20.6～68.2
|
|
HRB
|
59.6～99.6
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|
|
47.7～99.9
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|
37.0～99.9
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|
|
HRA
|
59.1~85.8
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|
|
|
61.7～88.0
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|
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
|
|
|
Hammered steel
|
HB
|
143~650
|
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|
|
|
|
|
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
|
|
|
|
|
|
|
|
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(copper-zinc alloys)
|
HB
|
40～173
|
|
|
|
|
|
|
HRB
|
13.5～95.3
|
|
|
|
|
|
|
|
Bronze (copper-aluminum/copper-tin alloys)
|
HB
|
60～290
|
|
|
|
|
|
|
Wrought copper
alloys
|
HB
|
45～315
|
|
|
|
|
|
|
No.
|
Material
|
HLD
|
Strength σb(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
|
