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Steel (B Scale)

Approximate Hardness Conversion Numbers
for Non-Austenitic Steels

Rockwell B Hardness No. 100 Kgf (HRB) Vicker’s Hardness Number (HV) Brinell Hardness No. 10mm Standard Ball, 3000 Kgf (HBS) Knoop Hardness Number 500 gf & Over (HK)
100 240 240 251
99 234 234 246
98 228 228 241
97 222 222 236
96 216 216 231
95 210 210 226
94 205 205 221
93 200 200 216
92 195 195 211
91 190 190 206
90 185 185 201
89 180 180 196
88 176 176 192
87 172 172 188
86 169 169 184
85 165 165 180
84 162 162 176
83 159 159 173
82 156 156 170
81 153 153 167
80 150 150 164
79 147 147 161
78 144 144 158
77 141 141 155
76 139 139 152
75 137 137 150
74 135 135 147
73 132 132 145
72 130 130 143
71 127 127 141
70 125 125 139
69 123 123 137
68 121 121 135
67 119 119 133
66 117 117 131
65 116 116 129
64 114 114 127
63 112 112 125
62 110 110 124
61 108 108 122
60 107 107 120
Rockwell Hardness Number A Scale, 60 Kgf (HRA) Rockwell Hardness Number F Scale, 60 Kgf (HRF) Rockwell Superficial Hardness No. 15T Scale, 15 Kgf (15T) Rockwell Superficial Hardness No. 30T Scale, 30 Kgf (30T) Rockwell Superficial Hardness No. 45T Scale, 45 Kgf (45T)
61.5 93.1 83.1 72.9
60.9 92.8 82.5 71.9
60.2 92.5 81.8 70.9
59.5 92.1 81.1 69.9
58.9 91.8 80.4 68.9
58.3 91.5 79.8 67.9
57.6 91.2 79.1 66.9
57 90.8 78.4 65.9
56.4 90.5 77.8 64.8
55.8 90.2 77.1 63.8
55.2 89.9 76.4 62.8
54.6 89.5 75.8 61.8
54 89.2 75.1 60.8
53.4 88.9 74.4 59.8
52.8 88.6 73.8 58.8
52.3 88.2 73.1 57.8
51.7 87.9 72.4 56.8
51.1 87.6 71.8 55.8
50.6 87.3 71.1 54.8
50 86.9 70.4 53.8
49.5 86.6 69.7 52.8
48.9 86.3 69.1 51.8
48.4 86 68.4 50.8
47.9 85.6 67.7 49.8
47.3 85.3 67.1 48.8
46.8 99.6 85 66.4 47.8
46.3 99.1 84.7 65.7 46.8
45.8 98.5 84.3 65.1 45.8
45.3 98 84 64.4 44.8
44.8 97.4 83.7 63.7 43.8
44.3 96.8 83.4 63.1 42.8
43.8 96.2 83 62.4 41.8
43.3 95.6 82.7 61.7 40.8
42.8 95.1 82.4 61 39.8
42.3 94.5 82.1 60.4 38.7
41.8 93.9 81.8 59.7 37.7
41.4 93.4 81.4 59 36.7
40.9 92.8 81.1 58.4 35.7
40.4 92.2 80.8 57.7 34.7
40 91.7 80.5 57 33.7
39.5 91.1 80.1 56.4 32.7