Hardness comparison
A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb) tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels.
Hardness comparison table
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| Brinell HB (10 mm Ball, 3000 kg load) | Vickers HV (1 kg) | Rockwell C HRC (120 degree cone 150 kg) | Rockwell B HRB (1/16" ball 100 kg) | Leeb HLD[1] |
|---|---|---|---|---|
| 800 | - | 72 | - | 856 |
| 780 | 1220 | 71 | - | 850 |
| 760 | 1210 | 70 | - | 843 |
| 745 | 1114 | 68 | - | 837 |
| 725 | 1060 | 67 | - | 829 |
| 712 | 1021 | 66 | - | 824 |
| 682 | 940 | 65 | - | 812 |
| 668 | 905 | 64 | - | 806 |
| 652 | 867 | 63 | - | 799 |
| 626 | 803 | 62 | - | 787 |
| 614 | 775 | 61 | - | 782 |
| 601 | 746 | 60 | - | 776 |
| 590 | 727 | 59 | - | 770 |
| 576 | 694 | 57 | - | 763 |
| 552 | 649 | 56 | - | 751 |
| 545 | 639 | 55 | - | 748 |
| 529 | 606 | 54 | - | 739 |
| 514 | 587 | 53 | 120 | 731 |
| 502 | 565 | 52 | 119 | 724 |
| 495 | 551 | 51 | 119 | 719 |
| 477 | 534 | 49 | 118 | 709 |
| 461 | 502 | 48 | 117 | 699 |
| 451 | 489 | 47 | 117 | 693 |
| 444 | 474 | 46 | 116 | 688 |
| 427 | 460 | 45 | 115 | 677 |
| 415 | 435 | 44 | 115 | 669 |
| 401 | 423 | 43 | 114 | 660 |
| 388 | 401 | 42 | 114 | 650 |
| 375 | 390 | 41 | 113 | 640 |
| 370 | 385 | 40 | 112 | 635 |
| 362 | 380 | 39 | 111 | 630 |
| 351 | 361 | 38 | 111 | 622 |
| 346 | 352 | 37 | 110 | 617 |
| 341 | 344 | 37 | 110 | 613 |
| 331 | 335 | 36 | 109 | 605 |
| 323 | 320 | 35 | 109 | 599 |
| 311 | 312 | 34 | 108 | 588 |
| 301 | 305 | 33 | 107 | 579 |
| 293 | 291 | 32 | 106 | 572 |
| 285 | 285 | 31 | 105 | 565 |
| 276 | 278 | 30 | 105 | 557 |
| 269 | 272 | 29 | 104 | 550 |
| 261 | 261 | 28 | 103 | 542 |
| 258 | 258 | 27 | 102 | 539 |
| 249 | 250 | 25 | 101 | 530 |
| 245 | 246 | 24 | 100 | 526 |
| 240 | 240 | 23 | 99 | 521 |
| 237 | 235 | 23 | 99 | 518 |
| 229 | 226 | 22 | 98 | 510 |
| 224 | 221 | 21 | 97 | 505 |
| 217 | 217 | 20 | 96 | 497 |
| 211 | 213 | 19 | 95 | 491 |
| 206 | 209 | 18 | 94 | 485 |
| 203 | 201 | 17 | 94 | 482 |
| 200 | 199 | 16 | 93 | 478 |
| 196 | 197 | 15 | 92 | 474 |
| 191 | 190 | 14 | 92 | 468 |
| 187 | 186 | 13 | 91 | 463 |
| 185 | 184 | 12 | 91 | 461 |
| 183 | 183 | 11 | 90 | 459 |
| 180 | 177 | 10 | 89 | 455 |
| 175 | 174 | 9 | 88 | 449 |
| 170 | 171 | 7 | 87 | 443 |
| 167 | 168 | 6 | 87 | 439 |
| 165 | 165 | 5 | 86 | 437 |
| 163 | 162 | 4 | 85 | 434 |
| 160 | 159 | 3 | 84 | 430 |
| 156 | 154 | 2 | 83 | 425 |
| 154 | 152 | 1 | 82 | 423 |
| 152 | 150 | - | 82 | 420 |
| 150 | 149 | - | 81 | 417 |
| 147 | 147 | - | 80 | 413 |
| 145 | 146 | - | 79 | 411 |
| 143 | 144 | - | 79 | 408 |
| 141 | 142 | - | 78 | 405 |
| 140 | 141 | - | 77 | 404 |
| 135 | 135 | - | 75 | 397 |
| 130 | 130 | - | 72 | 390 |
| 114 | 120 | - | 67 | 365 |
| 105 | 110 | - | 62 | 350 |
| 95 | 100 | - | 56 | 331 |
| 90 | 95 | - | 52 | 321 |
| 81 | 85 | - | 41 | 300 |
| 76 | 80 | - | 37 | 287 |
gollark: It is very expensive to develop drugs, and because many of them are for rather niche conditions now that cost can't be spread over many people.
gollark: Hmm. I had heard that hydroxychloroquine or however you spell that hadn't really been demonstrated to do anything useful.
gollark: That sounds extremely horrible and broken.
gollark: It would probably also encourage overstating R&D costs, or just randomly introducing waste so they're larger.
gollark: How would you measure that?
References
- H.Pollok, „Umwertung der Skalen“ (“Conversion of Scales”), Qualität und Zuverlässigkeit, Ausgabe 4/2008.
External links
- Hardness Conversion Table – Brinell, Rockwell,Vickers – Various steels . (Archived) (archived November 11, 2011)
- Rockwell to Brinell conversion chart (Brinell, Rockwell A,B,C)
- Struers hardness conversion table (Vickers, Brinell, Rockwell B,C,D)
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