Hardness Conversion Chart
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1
2
3Hardness Conversion Chart
Approximate equivalent hardness numbers for carbon and alloy steels
Rockwell
Rockwell Superfi cial
Brinell
Vickers
Knoop
Scleroscope
Approx.
Tensile
A
B
C
D
15N
30N
45N
3000kg
500g or
Scale
Scale
Scale
Scale
Scale
Scale
Scale
10 mm
Greater
Strength
60kg
100kg
150kg
100kg
15kg
30kg
45kg
Ball
Load
of Steel
Diam.
1/16”
Diam.
Diam.
Diam.
Diam.
Diam.
(PSI)
Brale
Ball
Brale
Brale
Brale
Brale
Brale
92
-
80.0
87
97
92
87
-
1865
-
-
-
92
-
79.0
86
-
92
87
-
1787
-
-
-
91
-
78.0
85
96
91
86
-
1710
-
-
-
91
-
77.0
84
-
91
85
-
1633
-
-
-
90
-
76.0
83
96
90
84
-
1556
-
-
-
90
-
75.0
83
-
89
83
-
1478
-
-
-
89
-
74.0
82
95
89
82
-
1400
-
-
-
89
-
73.0
81
-
88
81
-
1323
-
-
-
88
-
72.0
80
95
87
80
-
1245
-
-
-
87
-
71.0
80
-
87
79
-
1160
-
-
-
87
-
70.0
79
94
86
78
-
1076
-
99
-
86
-
69.0
78
-
85
77
-
1004
-
98
-
85.6
-
68.0
76.9
93.2
84.4
75.4
-
940
920
97
-
85.3
-
67.5
76.5
93.0
84.0
74.8
-
920
908
96
-
85.0
-
67.0
76.1
92.9
83.6
74.2
-
900
895
95
-
84.7
-
66.4
75.7
92.7
83.1
73.6
-
880
882
93
-
84.4
-
65.9
75.3
92.5
82.7
73.1
-
860
867
92
-
84.1
-
65.3
74.8
92.3
82.2
72.2
-
840
852
91
-
83.8
-
64.7
74.3
92.1
81.7
71.8
745*
820
837
90
-
83.4
-
64.0
73.8
91.8
81.1
71.0
-
800
822
88
-
83.0
-
63.3
73.3
91.5
80.4
70.2
-
780
806
87
-
82.6
-
62.5
72.6
91.2
79.7
69.4
710*
760
788
86
-
82.2
-
61.8
72.1
91.0
79.1
68.6
-
740
772
84
-
81.8
-
61.0
71.5
90.7
78.4
67.7
-
720
754
83
-
81.3
-
60.1
70.8
90.3
77.6
66.7
653*
700
735
81
-
81.1
-
59.7
70.5
90.1
77.2
66.2
-
690
725
-
-
80.8
-
59.2
70.1
89.8
76.8
65.7
-
680
716
80
329,000
80.6
-
58.8
69.8
89.7
76.4
65.3
-
670
706
-
324,000
80.3
-
58.3
69.4
89.5
75.9
64.7
620*
660
697
79
-
80.0
-
57.8
69.0
89.2
75.5
64.1
611*
650
687
78
-
79.8
-
57.3
68.7
89.0
75.1
63.5
601*
640
677
77
309,000
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