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Hardness Conversion Chart

HARDENED STEEL & HARD ALLOYS

ROCKWELL STANDARDS

 VICKERS BRINELL
C A D HV BHN
150 KG 60 KG 100 KG 10 KG 3000 Kg

DIAMOND INDENTER

  

100 mm Ball
80
79
78		 92.0
91.5
91.0		 86.5
85.5
84.5		 1865
1787
1710		 N.A.
77
76
75		 90.5
90.0
89.5		 84.0
83.0
82.5		 1633
1556
1478		 N.A.
74
73
72		 89.0
88.5
88.0		 81.5
81.0
80.0		 1400
1323
1245		 N.A.
71
70
69		 87.0
86.5
86.0		 79.5
78.5
78.0		 1160
1076
1004		 N.A.
68
67
66		 85.6
85.0
84.5		 76.9
76.1
75.4		 940
900
865		 N.A.
65
64
63		 83.9
83.4
82.8		 74.5
73.8
73.0		 832
800
772		 739
722
706
62
61
60		 82.3
81.8
81.2		 72.2
71.5
70.7		 746
720
697		 688
670
654
59
58
57		 80.7
80.1
79.6		 69.9
69.2
68.5		 674
653
633		 634
615
595
56
55
54		 79.0
78.5
78.0		 67.7
66.9
66.1		 613
595
577		 577
560
543
53
52
51		 77.4
76.8
76.3		 65.4
64.6
63.8		 560
544
528		 525
512
496
50
49
48		 75.9
75.2
74.7		 63.1
62.1
61.4		 513
498
484		 481
469
455
47
46
45		 74.1
73.6
73.1		 60.8
60.0
59.2		 471
458
446		 443
432
421
44
43
42		 72.5
72.0
71.5		 58.5
57.7
56.9		 434
423
412		 409
400
390
41
40
39		 70.9
70.4
69.9		 56.2
55.4
54.6		 402
392
382		 381
371
362
38
37
36		 69.4
68.9
68.4		 53.8
53.1
52.3		 372
363
354		 353
344
336
35
34
33		 67.9
67.4
66.8		 51.5
50.8
50.0		 345
336
327		 327
319
311
32
31
30		 66.3
65.8
65.3		 49.2
48.4
47.7		 318
310
302		 301
294
286
29
28
27		 64.6
64.3
63.8		 47.0
46.1
45.2		 294
286
279		 279
271
264
26
25
24		 63.3
62.8
62.4		 44.6
43.8
43.1		 272
266
260		 258
253
247
23
22
21		 62.0
61.5
61.0		 42.1
41.6
40.9		 254
248
243		 243
237
231
20 60.5 40.1 238 226

 

Soft Steel, Grey & Malleable Cast Iron &  Most Non-Ferrous Metals

ROCKWELL
STANDARD

ROCKWELL STANDARD

BRINELL

BRINELL
VICKERS
 B  F  E  H  K  A  HB BHN
--------
HV 

 100kg
1/16" Ball

 60kg
1/16"Ball

 100kg
1/8"Ball 		  60kg
1/8"Ball		  150kg
1/8"Ball		 60kg
Diamond 		 500kg
100mm Ball 		  3000kg 10mm
100
99
98		 N.A.   N.A.  N.A. N.A.  61.5
60.9
60.2		 201
195
189		 240
234
228
97
96
95		  N.A.  N.A.  N.A.  N.A. 59.5
58.9
58.3		 184
179
175		 222
216
210
94
93
92		 N.A.   N.A.  N.A.
 
100		 57.6
57.0
56.4		 171
167
163		 205
200
195
91
90
89		  N.A.  N.A.  N.A. 99.5
98.5
98.0		 55.8
55.2
54.6		 160
157
154		 190
185
180
88
87
86		  N.A. N.A.   N.A. 97.0
96.5
95.5		 54.0
53.4
52.8		 151
148
145		 176
172
169
85
84
83		  N.A.  N.A.  N.A. 94.5
94.0
93.0		 52.3
51.7
51.1		 142
140
137		 165
162
159
82
81
80		  N.A.  N.A. N.A.  92.0
91.0
90.5		 50.6
50.0
49.5		 135
133
130		 156
153
150
79
78
77		  N.A.  N.A. N.A.  89.5
88.5
88.0		 48.9
48.4
47.9		 128
126
124		 147
144
141
76
75
74
99.6
99.1		  N.A.  N.A. 87.0
86.0
85.0		 47.3
46.8
46.3		 122
120
118		 139
137
135
73
72
71		 98.5
98.0
97.4		 --
--
100.00		  N.A. 84.5
83.5
82.5		 45.8
45.3
44.8		 116
114
112		 132
130
127
70
69
68		 96.8
96.2
95.6		 99.5
99.0
98.0		  N.A. 81.5
81.0
80.0		 44.3
43.8
43.3		 110
109
107		 125
132
121
67
66
65		 95.1
94.5
93.9		 97.5
97.0
96.0		  N.A. 79.0
78.5
77.5		 42.8
42.3
41.8		 106
104
102		 119
117
116
64
63
62		 93.4
92.8
92.8		 95.5
95.0
94.5		  N.A. 76.0
74.5
74.0		 41.4
40.9
40.4		 101
99
98		 114
112
110
61
60
59		 91.7
91.1
90.5		 93.5
93.0
92.5		  N.A. 74.0
73.0
72.0		 40.0
39.5
39.0		 96
95
94		 108
107
106
58
57
56		 90.0
89.4
88.8		 92.0
91.0
90.5		  N.A. 71.0
70.5
69.5		 38.7
38.1
37.7 		 92
91
90		 104
103
101
55
54
53		 88.2
87.7
87.1		 90.0
89.5
89.0		 N.A. 68.5
68.0
67.0		 37.2
36.8
36.3		 89
87
86		 N.A.
52
51		 86.5
86.0		 88.0
87.5		 N.A. 66.0
65.0		 35.9
35.5		 85
84		 N.A.
50
49
48		 85.4
84.8
84.3		 87.0
86.5
85.5		 N.A. 64.5
63.5
62.5		 35.0
34.6
34.1		 83
82
81		 N.A.
47
46
45		 83.7
83.1
82.6		 85.0
84.5
84.0		 N.A. 61.5
61.0
60.0		 33.7
33.3
32.9		 80
80
79		 N.A.
44
43
42		 82.0
81.4
80.8		 83.5
82.5
82.0		 N.A. 59.0
58.0
57.5		 32.4
32.0
31.6		 78
77
76		 N.A.
41
40
39		 80.3
79.7
79.1		 81.5
81.0
80.0		 N.A. 56.5
55.5
54.5		 31.2
30.7
30.3		 75
75
74		 N.A.
38
37
36		 78.6
78.0
77.4		 79.5
79.0
78.5		 N.A. 54.0
53.0
52.0		 29.9
29.5
29.1		 73
72
72		 N.A.
35
34
33		 76.9
76.3
75.7		 78.0
77.0
76.5		 N.A. 51.5
50.5
49.5		 28.7
28.2
27.8		 71
70
69		 N.A.
32
31
30		 75.2
74.6
74.0		 76.0
75.5
75.0		 N.A. 48.5
48.0
47.0		 27.4
27.0
26.6		 69
68
67		 N.A.
29
28
27		 73.5
73.0
72.5		 74.0
73.5
73.0		 N.A. 46.0
45.0
44.5		 26.0
25.5
25.0		 66
66
65		 N.A.
26
25
24		 72.0
71.0
70.5		 72.5
72.0
71.0		 N.A. 43.5
42.5
41.5		 24.5
24.3
24.0		 65
64
64		 N.A.
23
22
21		 70.0
69.5
69.0		 70.5
70.0
69.5		 N.A. 41.0
40.0
39.0		 23.5
23.0
22.5		 63
62
62		 N.A.
20
19
18		 68.5
68.0
67.0		 68.5
68.0
67.5		 N.A. 38.0
37.5
36.5		 22.0
21.5
21.3		 61
61
60		 N.A.
17
16
15		 66.5
66.0
65.5		 67.0
66.5
65.5		 N.A. 35.5
35.0
34.0		 21.0
20.5
20.0		 60
59
59		 N.A.
14
13
12		 65.0
64.5
64.0		 65.0
64.5
64.0		 N.A. 33.0
32.0
31.5		  N.A. 59
58
58		 N.A.
11
10
9		 63.5
63.0
62.0		 63.5
62.5
62.0		 N.A. 30.5
29.5
29.0		  N.A. 57
57
57		 N.A.
8
7
6		 61.5
61.0
60.5		 61.5
61.0
60.5		 N.A. 28.0
27.0
26.0		  N.A. 56
56
55		 N.A.
5
4
3		 60.0
59.5
59.0		 60.0
59.0
58.5		 N.A. 25.5
24.5
23.5		  N.A. 55
54
54		 N.A.
2
1		 58.0
57.5		 58.5
57.5		 N.A. 23
22		 N.A. 54
54		 N.A.

 

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