Twardość materiału możemy określić za pomocą kilku parametrów takich jak N/mm2, HV 10, HB czy najczęściej spotykanej jednostki twardości Rockwella, HRC. Metodą Rockwella określana jest twardość między innymi listew zębatych i mieści się ona w zakresie od 25 do 30 HRC.
Poniżej przedstawiamy:
Twardość Vickersa
Twardość Brinella
Twardość Rockwella HRC
| N/mm2 | HV 10 | HB | HRC |
|---|---|---|---|
| 240 | 75 | 74 | – |
| 255 | 80 | 76 | – |
| 270 | 85 | 81 | – |
| 285 | 90 | 86 | – |
| 305 | 95 | 90 | – |
| 320 | 100 | 95 | – |
| 335 | 105 | 100 | – |
| 350 | 110 | 105 | – |
| 370 | 115 | 109 | – |
| 385 | 120 | 114 | – |
| 400 | 125 | 119 | – |
| 415 | 130 | 124 | – |
| 430 | 135 | 128 | – |
| 450 | 140 | 133 | 41 |
| 465 | 145 | 138 | – |
| 480 | 150 | 143 | – |
| 495 | 155 | 147 | – |
| 510 | 160 | 152 | – |
| 530 | 165 | 157 | – |
| 545 | 170 | 162 | – |
| 560 | 175 | 166 | – |
| 575 | 180 | 171 | – |
| 595 | 185 | 176 | – |
| 610 | 190 | 181 | – |
| 625 | 195 | 185 | – |
| 640 | 200 | 190 | – |
| 660 | 205 | 195 | – |
| 675 | 210 | 199 | – |
| 690 | 215 | 204 | – |
| 705 | 220 | 209 | – |
| 720 | 225 | 214 | – |
| 740 | 230 | 219 | – |
| 755 | 235 | 223 | – |
| 770 | 240 | 228 | – |
| 785 | 245 | 233 | – |
| 800 | 250 | 238 | 22 |
| 820 | 255 | 242 | 23 |
| 835 | 260 | 247 | 24 |
| 860 | 268 | 255 | 25 |
| 870 | 272 | 258 | 26 |
| 900 | 280 | 266 | 27 |
| N/mm2 | HV 10 | HB | HRC |
|---|---|---|---|
| 920 | 287 | 273 | 28 |
| 940 | 293 | 278 | 29 |
| 970 | 302 | 287 | 30 |
| 995 | 310 | 295 | 31 |
| 1020 | 317 | 301 | 32 |
| 1050 | 327 | 311 | 33 |
| 1080 | 336 | 319 | 34 |
| 1110 | 345 | 328 | 35 |
| 1140 | 355 | 327 | 36 |
| 1170 | 364 | 346 | 37 |
| 1200 | 373 | 354 | 38 |
| 1230 | 382 | 363 | 39 |
| 1260 | 392 | 372 | 40 |
| 1300 | 403 | 383 | 41 |
| 1330 | 413 | 393 | 42 |
| 1360 | 423 | 402 | 43 |
| 1400 | 434 | 413 | 44 |
| 1440 | 436 | 424 | 45 |
| 1480 | 458 | 435 | 46 |
| 1530 | 473 | 449 | 47 |
| 1570 | 484 | 460 | 48 |
| 1620 | 497 | 472 | 49 |
| 1680 | 514 | 488 | 50 |
| 1730 | 527 | 501 | 51 |
| 1790 | 544 | 517 | 52 |
| 1845 | 560 | 532 | 53 |
| 1910 | 578 | 549 | 54 |
| 1980 | 596 | 567 | 55 |
| 2050 | 615 | 584 | 56 |
| 2140 | 635 | 607 | 57 |
| – | 655 | 622 | 58 |
| – | 675 | – | 59 |
| – | 698 | – | 60 |
| – | 720 | – | 61 |
| – | 745 | – | 62 |
| – | 773 | – | 63 |
| – | 800 | – | 64 |
| – | 829 | – | 65 |
| – | 864 | – | 66 |
| – | 900 | – | 67 |
| – | 940 | – | 68 |
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