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Material
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Hardness method
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Impact device
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D/DC
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D+15
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C
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G
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E
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DL
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Steel and cast steel
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HRC
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17.9～68.5
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19.3～67.9
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20.0～69.5
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22.4～70.7
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20.6～68.2
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HRB
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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
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59.1~85.8
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61.7～88.0
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HB
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127～651
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80～638
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80～683
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90～646
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83～663
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81～646
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HV
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83～976
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80～937
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80～996
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84～1042
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80～950
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HS
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32.2～99.5
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33.3～99.3
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31.8～102.1
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35.8～102.6
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30.6～96.8
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Hammered steel
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HB
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143~650
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Cold work tool steel
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HRC
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20.4～67.1
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19.8～68.2
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20.7～68.2
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22.6～70.2
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HV
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80～898
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80～935
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100～941
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82～1009
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Stainless steel
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HRB
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46.5～101.7
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HB
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85～655
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HV
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85～802
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Gray cast iron
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HRC
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HB
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93～334
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92～326
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HV
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Nodular cast iron
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HRC
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HB
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131～387
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127～364
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HV
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Cast aluminum
alloys
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HB
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19～164
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23～210
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32～168
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HRB
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23.8～84.6
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22.7～85.0
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23.8～85.5
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Brass(copper-zinc alloys)
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HB
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40～173
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HRB
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13.5～95.3
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Bronze (copper-aluminum/copper-tin alloys)
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HB
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60～290
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Wrought copper
alloys
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HB
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45～315
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No.
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Material
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HLD
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Strength σb(Mpa)
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1
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Mild steel
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350～522
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374～780
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2
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High-carbon steel
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500～710
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737～1670
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3
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Cr steel
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500～730
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707～1829
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4
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Cr-V steel
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500～750
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704～1980
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5
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Cr-Ni steel
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500～750
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763～2007
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6
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Cr-Mo steel
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500～738
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721～1875
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7
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Cr-Ni-Mo steel
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540～738
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844～1933
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8
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Cr-Mn-Si steel
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500～750
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755～1993
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9
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Super strength steel
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630～800
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1180～2652
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10
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Stainless steel
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500～710
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703～1676
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