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| Approximate Hardness Conversion Numbers for Non-Austenitic Steels | |||||||||
| Rockwell Hardness Number C Scale, 150 Kgf (HRC) | Vicker's Hardness Number (HV) | Brinell Hardness No. 10mm Standard Ball, 3000 Kgf (HBS) | Brinell Hardness No. 10mm Carbide Ball, 3000 Kgf (HBW) | Knoop Hardness Number 500 gf & Over (HK) | Rockwell Hardness Number A Scale, 60 Kgf (HRA) | Rockwell Hardness Number D Scale, 100 Kgf (HRD) | Rockwell Superficial Hardness No. 15N Scale, 15 Kgf (15N) | Rockwell Superficial Hardness No. 30N Scale, 30 Kgf (30N) | Rockwell Superficial Hardness No. 45N Scale, 45 Kgf (45N) |
| 68 | 940 | … | … | 920 | 85.6 | 76.9 | 93.2 | 84.4 | 75.4 |
| 67 | 900 | … | … | 895 | 85 | 76.1 | 92.9 | 83.6 | 74.2 |
| 66 | 865 | … | … | 870 | 84.5 | 75.4 | 92.5 | 82.8 | 73.3 |
| 65 | 832 | … | … | 846 | 83.9 | 74.5 | 92.2 | 81.9 | 72 |
| 64 | 800 | … | … | 822 | 83.4 | 73.8 | 91.8 | 81.1 | 71 |
| 63 | 772 | … | … | 799 | 82.8 | 73 | 91.4 | 80.1 | 69.9 |
| 62 | 746 | … | … | 776 | 82.3 | 72.2 | 91.1 | 79.3 | 68.8 |
| 61 | 720 | … | … | 754 | 81.8 | 71.5 | 90.7 | 78.4 | 67.7 |
| 60 | 697 | … | … | 732 | 81.2 | 70.7 | 90.2 | 77.5 | 66.6 |
| 59 | 674 | … | 634 | 710 | 80.7 | 69.9 | 89.8 | 76.6 | 65.5 |
| 58 | 653 | … | 615 | 690 | 80.1 | 69.2 | 89.3 | 75.7 | 64.3 |
| 57 | 633 | … | 595 | 670 | 79.6 | 68.5 | 88.9 | 74.8 | 63.2 |
| 56 | 613 | … | 577 | 650 | 79 | 67.7 | 88.3 | 73.9 | 62 |
| 55 | 595 | … | 560 | 630 | 78.5 | 66.9 | 87.9 | 73 | 60.9 |
| 54 | 577 | … | 543 | 612 | 78 | 66.1 | 87.4 | 72 | 59.8 |
| 53 | 560 | … | 525 | 594 | 77.4 | 65.4 | 86.9 | 71.2 | 58.6 |
| 52 | 544 | … | 512 | 576 | 76.8 | 64.6 | 86.4 | 70.2 | 57.4 |
| 51 | 528 | … | 496 | 558 | 76.3 | 63.8 | 85.9 | 69.4 | 56.1 |
| 50 | 513 | … | 481 | 542 | 75.9 | 63.1 | 85.5 | 68.5 | 55 |
| 49 | 498 | … | 469 | 526 | 75.2 | 62.1 | 85 | 67.6 | 53.8 |
| 48 | 484 | 451 | 455 | 510 | 74.7 | 61.4 | 84.5 | 66.7 | 52.5 |
| 47 | 471 | 442 | 443 | 495 | 74.1 | 60.8 | 83.9 | 65.8 | 51.4 |
| 46 | 458 | 432 | 432 | 480 | 73.6 | 60 | 83.5 | 64.8 | 50.3 |
| 45 | 446 | 421 | 421 | 466 | 73.1 | 59.2 | 83 | 64 | 49 |
| 44 | 434 | 409 | 409 | 452 | 72.5 | 58.5 | 82.5 | 63.1 | 47.8 |
| 43 | 423 | 400 | 400 | 438 | 72 | 57.7 | 82 | 62.2 | 46.7 |
| 42 | 412 | 390 | 390 | 426 | 71.5 | 56.9 | 81.5 | 61.3 | 45.5 |
| 41 | 402 | 381 | 381 | 414 | 70.9 | 56.2 | 80.9 | 60.4 | 44.3 |
| 40 | 392 | 371 | 371 | 402 | 70.4 | 55.4 | 80.4 | 59.5 | 43.1 |
| 39 | 382 | 362 | 362 | 391 | 69.9 | 54.6 | 79.9 | 58.6 | 41.9 |
| 38 | 372 | 353 | 353 | 380 | 69.4 | 53.8 | 79.4 | 57.7 | 40.8 |
| 37 | 363 | 344 | 344 | 370 | 68.9 | 53.1 | 78.8 | 56.8 | 39.6 |
| 36 | 354 | 336 | 336 | 360 | 68.4 | 52.3 | 78.3 | 55.9 | 38.4 |
| 35 | 345 | 327 | 327 | 351 | 67.9 | 51.5 | 77.7 | 55 | 37.2 |
| 34 | 336 | 319 | 319 | 342 | 67.4 | 50.8 | 77.2 | 54.2 | 36.1 |
| 33 | 327 | 311 | 311 | 334 | 66.8 | 50 | 76.6 | 53.3 | 34.9 |
| 32 | 318 | 301 | 301 | 326 | 66.3 | 49.2 | 76.1 | 52.1 | 33.7 |
| 31 | 310 | 294 | 294 | 318 | 65.8 | 48.4 | 75.6 | 51.3 | 32.5 |
| 30 | 302 | 286 | 286 | 311 | 65.3 | 47.7 | 75 | 50.4 | 31.3 |
| 29 | 294 | 279 | 279 | 304 | 64.8 | 47 | 74.5 | 49.5 | 30.1 |
| 28 | 286 | 271 | 271 | 297 | 64.3 | 46.1 | 73.9 | 48.6 | 28.9 |
| 27 | 279 | 264 | 264 | 290 | 63.8 | 45.2 | 73.3 | 47.7 | 27.8 |
| 26 | 272 | 258 | 258 | 284 | 63.3 | 44.6 | 72.8 | 46.8 | 26.7 |
| 25 | 266 | 253 | 253 | 278 | 62.8 | 43.8 | 72.2 | 45.9 | 25.5 |
| 24 | 260 | 247 | 247 | 272 | 62.4 | 43.1 | 71.6 | 45 | 24.3 |
| 23 | 254 | 243 | 243 | 266 | 62 | 42.1 | 71 | 44 | 23.1 |
| 22 | 248 | 237 | 237 | 261 | 61.5 | 41.6 | 70.5 | 43.2 | 22 |
| 21 | 243 | 231 | 231 | 256 | 61 | 40.9 | 69.9 | 42.3 | 20.7 |
| 20 | 238 | 226 | 226 | 251 | 60.5 | 40.1 | 69.4 | 41.5 | 19.6 |
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