Hardness comparison
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There are a large number of hardness testing methods available (eg. Vickers, Brinell and Rockwell). Although it is impossible in many cases to give an exact conversion it is possible to give a comparison table.
[edit] Hardness Comparison Table
| Brinell (10 mm Ball, 3000 kg load) |
Vickers (120 kg) |
Rockwell C (120 degree cone 150 kg) |
Rockwell B (1/16" ball 100 kg) |
|---|---|---|---|
| 800 | - | 72 | - |
| 780 | 1220 | 71 | - |
| 760 | 1170 | 70 | - |
| 745 | 1114 | 68 | - |
| 725 | 1060 | 67 | - |
| 712 | 1021 | 66 | - |
| 682 | 940 | 65 | - |
| 668 | 905 | 64 | - |
| 652 | 867 | 63 | - |
| 626 | 803 | 62 | - |
| 614 | 775 | 61 | - |
| 601 | 746 | 60 | - |
| 590 | 727 | 59 | - |
| 576 | 694 | 57 | - |
| 552 | 649 | 56 | - |
| 545 | 639 | 55 | - |
| 529 | 606 | 54 | - |
| 514 | 587 | 53 | 120 |
| 502 | 565 | 52 | 119 |
| 495 | 551 | 51 | 119 |
| 477 | 534 | 49 | 118 |
| 461 | 502 | 48 | 117 |
| 451 | 489 | 47 | 117 |
| 444 | 474 | 46 | 116 |
| 427 | 460 | 45 | 115 |
| 415 | 435 | 44 | 115 |
| 401 | 423 | 43 | 114 |
| 388 | 401 | 42 | 114 |
| 375 | 390 | 41 | 113 |
| 370 | 385 | 40 | 112 |
| 362 | 380 | 39 | 111 |
| 351 | 361 | 38 | 111 |
| 346 | 352 | 37 | 110 |
| 341 | 344 | 37 | 110 |
| 331 | 335 | 36 | 109 |
| 323 | 320 | 35 | 109 |
| 311 | 312 | 34 | 108 |
| 301 | 305 | 33 | 107 |
| 293 | 291 | 32 | 106 |
| 285 | 285 | 31 | 105 |
| 276 | 278 | 30 | 105 |
| 269 | 272 | 29 | 104 |
| 261 | 261 | 28 | 103 |
| 258 | 258 | 27 | 102 |
| 249 | 250 | 25 | 101 |
| 245 | 246 | 24 | 100 |
| 240 | 240 | 23 | 99 |
| 237 | 235 | 23 | 99 |
| 229 | 226 | 22 | 98 |
| 224 | 221 | 21 | 97 |
| 217 | 217 | 20 | 96 |
| 211 | 213 | 19 | 95 |
| 206 | 209 | 18 | 94 |
| 203 | 201 | 17 | 94 |
| 200 | 199 | 16 | 93 |
| 196 | 197 | 15 | 92 |
| 191 | 190 | 14 | 92 |
| 187 | 186 | 13 | 91 |
| 185 | 184 | 12 | 91 |
| 183 | 183 | 11 | 90 |
| 180 | 177 | 10 | 89 |
| 175 | 174 | 9 | 88 |
| 170 | 191 | 7 | 87 |
| 167 | 168 | 6 | 87 |
| 165 | 165 | 5 | 86 |
| 163 | 162 | 4 | 85 |
| 160 | 159 | 3 | 84 |
| 156 | 154 | 2 | 83 |
| 154 | 152 | 1 | 82 |
| 152 | 150 | - | 82 |
| 150 | 149 | - | 81 |
| 147 | 147 | - | 80 |
| 145 | 146 | - | 79 |
| 143 | 144 | - | 79 |
| 141 | 142 | - | 78 |
| 140 | 141 | - | 77 |
| 135 | 135 | - | 75 |
| 130 | 130 | - | 72 |
| 114 | 120 | - | 67 |
| 105 | 110 | - | 62 |
| 95 | 100 | - | 56 |
| 90 | 95 | - | 52 |
| 81 | 85 | - | 41 |
| 76 | 80 | - | 37 |
