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常用黑色金屬硬度對照表（強度近似換算）
| 常見黑色金屬硬度對照表（強度近似換算） |
| 硬度分類 |
抗拉強度
N/mm2 |
| 洛氏 |
維氏 |
布氏 |
| HRC |
HRA |
HV |
HB |
| 17 |
— |
211 |
211 |
710 |
| 17.5 |
— |
214 |
214 |
715 |
| 18 |
— |
216 |
216 |
725 |
| 18.5 |
— |
218 |
218 |
730 |
| 19 |
— |
221 |
220 |
735 |
| 19.5 |
— |
223 |
222 |
745 |
| 20 |
— |
226 |
225 |
750 |
| 20.5 |
— |
229 |
227 |
760 |
| 21 |
— |
231 |
229 |
765 |
| 21.5 |
— |
234 |
232 |
775 |
| 22 |
— |
237 |
234 |
785 |
| 22.5 |
— |
240 |
237 |
790 |
| 23 |
— |
243 |
240 |
800 |
| 23.5 |
— |
246 |
242 |
810 |
| 24 |
— |
249 |
245 |
820 |
| 24.5 |
— |
252 |
248 |
830 |
| 25 |
— |
255 |
251 |
835 |
| 25.5 |
— |
258 |
254 |
850 |
| 26 |
— |
261 |
257 |
860 |
| 26.5 |
— |
264 |
260 |
870 |
| 27 |
— |
268 |
263 |
880 |
| 27.5 |
— |
271 |
266 |
890 |
| 28 |
— |
274 |
269 |
900 |
| 28.5 |
— |
278 |
273 |
910 |
| 29 |
— |
281 |
276 |
920 |
| 29.5 |
— |
285 |
280 |
935 |
| 30 |
— |
289 |
283 |
950 |
| 30.5 |
— |
292 |
287 |
960 |
| 31 |
— |
296 |
291 |
970 |
| 31.5 |
— |
300 |
294 |
980 |
| 32 |
— |
304 |
298 |
995 |
| 32.5 |
— |
308 |
302 |
1010 |
| 33 |
— |
312 |
306 |
1020 |
| 33.5 |
— |
316 |
310 |
1035 |
| 34 |
— |
320 |
314 |
1050 |
| 34.5 |
— |
324 |
318 |
1065 |
| 35 |
— |
329 |
323 |
1080 |
| 35.5 |
— |
333 |
327 |
1095 |
| 36 |
— |
338 |
332 |
1110 |
| 36.5 |
— |
342 |
336 |
1125 |
| 37 |
— |
347 |
341 |
1140 |
| 37.5 |
— |
352 |
345 |
1160 |
| 38 |
— |
357 |
350 |
1175 |
| 38.5 |
— |
362 |
355 |
1190 |
| 39 |
70 |
367 |
360 |
1210 |
| 39.5 |
70.3 |
372 |
365 |
1225 |
| 40 |
70.8 |
382 |
375 |
1260 |
| 40 |
70.5 |
377 |
370 |
1245 |
| 41 |
71.1 |
388 |
380 |
1280 |
| 41.5 |
71.3 |
393 |
385 |
1300 |
| 42 |
71.6 |
399 |
391 |
1320 |
| 42.5 |
71.8 |
405 |
396 |
1340 |
| 43 |
72.1 |
411 |
401 |
1360 |
| 43.5 |
72.4 |
417 |
40, 7 |
1385 |
| 44 |
72.6 |
423 |
413 |
1405 |
| 44.5 |
72.9 |
429 |
418 |
1430 |
| 45 |
73.2 |
436 |
424 |
1450 |
| 45.5 |
73.4 |
443 |
430 |
1475 |
| 46 |
73.7 |
449 |
436 |
1500 |
| 46.5 |
73.9 |
456 |
442 |
1525 |
| 47 |
74.2 |
463 |
449 |
1550 |
| 47.5 |
74.5 |
470 |
455 |
1575 |
| 48 |
74.7 |
478 |
461 |
1605 |
| 48.5 |
75 |
485 |
468 |
1630 |
| 49 |
75.3 |
493 |
474 |
1660 |
| 49.5 |
75.5 |
501 |
481 |
1690 |
| 50 |
75.8 |
509 |
488 |
1720 |
| 50.5 |
76.1 |
517 |
494 |
1750 |
| 51 |
76.3 |
525 |
501 |
1780 |
| 51.5 |
76.6 |
534 |
— |
1815 |
| 52 |
76.9 |
543 |
— |
1850 |
| 52.5 |
77.1 |
551 |
— |
1885 |
| 53 |
77.4 |
561 |
— |
1920 |
| 53.5 |
77.7 |
570 |
— |
1955 |
| 54 |
77.9 |
579 |
— |
1995 |
| 54.5 |
78.2 |
589 |
— |
2035 |
| 55 |
78.5 |
599 |
— |
2075 |
| 55.5 |
78.7 |
609 |
— |
2115 |
| 56 |
79 |
620 |
— |
2160 |
| 56.5 |
79.3 |
631 |
— |
2205 |
| 57 |
79.5 |
642 |
— |
2250 |
| 57.5 |
79.8 |
653 |
— |
2295 |
| 58 |
80.1 |
664 |
— |
2345 |
| 58.5 |
80.3 |
676 |
— |
2395 |
| 59 |
80.6 |
688 |
— |
2450 |
| 59.5 |
80.9 |
700 |
— |
2500 |
| 60 |
81.2 |
713 |
— |
2555 |
| 60.5 |
81.4 |
726 |
— |
— |
| 61 |
81.7 |
739 |
— |
— |
| 61.5 |
82 |
752 |
— |
— |
| 62 |
82.2 |
766 |
— |
— |
| 62.5 |
82.5 |
780 |
— |
— |
| 63 |
82.8 |
795 |
— |
— |
| 63.5 |
83.1 |
810 |
— |
— |
| 64 |
83.3 |
825 |
— |
— |
| 64.5 |
83.6 |
840 |
— |
— |
| 65 |
83.9 |
856 |
— |
— |
| 65.5 |
84.1 |
872 |
— |
— |
| 66 |
84.4 |
889 |
— |
— |
| 66.5 |
84.7 |
906 |
— |
— |
| 67 |
85 |
923 |
— |
— |
| 67.5 |
85.2 |
941 |
— |
— |
| 68 |
85.5 |
959 |
— |
— |
| 68.5 |
85.8 |
978 |
— |
— |
| 69 |
86.1 |
997 |
— |
— |
| 69.5 |
86.3 |
1017 |
— |
— |
| 70 |
86.6 |
1037 |
— |
— |
硬度高于20HRC ，1HRC≈10HB，
硬度低于20HRC，1HRC≈11.5HB。
備注：對于切削加工，基本可統(tǒng)一換算1HRC≈10HB（工件材料硬度有波動范圍）
資料來源：數(shù)控中國論壇
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