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| 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) | 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) |
| 100 | 240 | 240 | 251 | 61.5 | … | 93.1 | 83.1 | 72.9 |
| 99 | 234 | 234 | 246 | 60.9 | … | 92.8 | 82.5 | 71.9 |
| 98 | 228 | 228 | 241 | 60.2 | … | 92.5 | 81.8 | 70.9 |
| 97 | 222 | 222 | 236 | 59.5 | … | 92.1 | 81.1 | 69.9 |
| 96 | 216 | 216 | 231 | 58.9 | … | 91.8 | 80.4 | 68.9 |
| 95 | 210 | 210 | 226 | 58.3 | … | 91.5 | 79.8 | 67.9 |
| 94 | 205 | 205 | 221 | 57.6 | … | 91.2 | 79.1 | 66.9 |
| 93 | 200 | 200 | 216 | 57 | … | 90.8 | 78.4 | 65.9 |
| 92 | 195 | 195 | 211 | 56.4 | … | 90.5 | 77.8 | 64.8 |
| 91 | 190 | 190 | 206 | 55.8 | … | 90.2 | 77.1 | 63.8 |
| 90 | 185 | 185 | 201 | 55.2 | … | 89.9 | 76.4 | 62.8 |
| 89 | 180 | 180 | 196 | 54.6 | … | 89.5 | 75.8 | 61.8 |
| 88 | 176 | 176 | 192 | 54 | … | 89.2 | 75.1 | 60.8 |
| 87 | 172 | 172 | 188 | 53.4 | … | 88.9 | 74.4 | 59.8 |
| 86 | 169 | 169 | 184 | 52.8 | … | 88.6 | 73.8 | 58.8 |
| 85 | 165 | 165 | 180 | 52.3 | … | 88.2 | 73.1 | 57.8 |
| 84 | 162 | 162 | 176 | 51.7 | … | 87.9 | 72.4 | 56.8 |
| 83 | 159 | 159 | 173 | 51.1 | … | 87.6 | 71.8 | 55.8 |
| 82 | 156 | 156 | 170 | 50.6 | … | 87.3 | 71.1 | 54.8 |
| 81 | 153 | 153 | 167 | 50 | … | 86.9 | 70.4 | 53.8 |
| 80 | 150 | 150 | 164 | 49.5 | … | 86.6 | 69.7 | 52.8 |
| 79 | 147 | 147 | 161 | 48.9 | … | 86.3 | 69.1 | 51.8 |
| 78 | 144 | 144 | 158 | 48.4 | … | 86 | 68.4 | 50.8 |
| 77 | 141 | 141 | 155 | 47.9 | … | 85.6 | 67.7 | 49.8 |
| 76 | 139 | 139 | 152 | 47.3 | … | 85.3 | 67.1 | 48.8 |
| 75 | 137 | 137 | 150 | 46.8 | 99.6 | 85 | 66.4 | 47.8 |
| 74 | 135 | 135 | 147 | 46.3 | 99.1 | 84.7 | 65.7 | 46.8 |
| 73 | 132 | 132 | 145 | 45.8 | 98.5 | 84.3 | 65.1 | 45.8 |
| 72 | 130 | 130 | 143 | 45.3 | 98 | 84 | 64.4 | 44.8 |
| 71 | 127 | 127 | 141 | 44.8 | 97.4 | 83.7 | 63.7 | 43.8 |
| 70 | 125 | 125 | 139 | 44.3 | 96.8 | 83.4 | 63.1 | 42.8 |
| 69 | 123 | 123 | 137 | 43.8 | 96.2 | 83 | 62.4 | 41.8 |
| 68 | 121 | 121 | 135 | 43.3 | 95.6 | 82.7 | 61.7 | 40.8 |
| 67 | 119 | 119 | 133 | 42.8 | 95.1 | 82.4 | 61 | 39.8 |
| 66 | 117 | 117 | 131 | 42.3 | 94.5 | 82.1 | 60.4 | 38.7 |
| 65 | 116 | 116 | 129 | 41.8 | 93.9 | 81.8 | 59.7 | 37.7 |
| 64 | 114 | 114 | 127 | 41.4 | 93.4 | 81.4 | 59 | 36.7 |
| 63 | 112 | 112 | 125 | 40.9 | 92.8 | 81.1 | 58.4 | 35.7 |
| 62 | 110 | 110 | 124 | 40.4 | 92.2 | 80.8 | 57.7 | 34.7 |
| 61 | 108 | 108 | 122 | 40 | 91.7 | 80.5 | 57 | 33.7 |
| 60 | 107 | 107 | 120 | 39.5 | 91.1 | 80.1 | 56.4 | 32.7 |
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