|
|
|
Rockwell
C Scale
HRC |
Vickers
Hardness
Hv |
Brienell Hardness
HB |
Rockwell Hardness |
Shore
Hardness
Hs |
Standard
Ball |
Tungsten
Carbon Ball |
HRA
A Scle |
HRB
B Scle< |
| 68 |
940 |
- |
- |
85.6 |
- |
97 |
| 67 |
900 |
- |
- |
85.0 |
- |
95 |
| 66 |
865 |
- |
- |
84.5 |
- |
92 |
| 65 |
832 |
- |
739 |
83.9 |
- |
91 |
| 64 |
800 |
- |
722 |
83.4 |
- |
88 |
| 63 |
772 |
- |
705 |
82.8 |
- |
87 |
| 62 |
746 |
- |
688 |
82.3 |
- |
85 |
| 61 |
720 |
- |
67.0 |
81.8 |
- |
83 |
| 60 |
697 |
- |
654 |
81.2 |
- |
81 |
| 59 |
674 |
- |
63.4 |
80.7 |
- |
80 |
| 58 |
653 |
- |
615 |
80.1 |
- |
78 |
| 57 |
633 |
- |
595 |
79.6 |
- |
76 |
| 56 |
613 |
- |
577 |
79.0 |
- |
75 |
| 55 |
595 |
- |
560 |
78.5 |
- |
74 |
| 54 |
577 |
- |
543 |
78.0 |
- |
72 |
| 53 |
560 |
- |
525 |
77.4 |
- |
71 |
| 52 |
544 |
500 |
512 |
76.8 |
- |
69 |
| 51 |
528 |
487 |
496 |
76.3 |
- |
68 |
| 50 |
513 |
475 |
481 |
75.9 |
- |
67 |
| 49 |
498 |
464 |
469 |
75.2 |
- |
66 |
| 48 |
484 |
451 |
455 |
74.7 |
- |
64 |
| 47 |
471 |
442 |
443 |
74.1 |
- |
63 |
| 46 |
458 |
432 |
432 |
73.6 |
- |
62 |
| 45 |
446 |
421 |
421 |
73.0 |
- |
60 |
| 44 |
434 |
409 |
409 |
72.5 |
- |
58 |
| 43 |
423 |
400 |
400 |
72.0 |
- |
57 |
| 42 |
412 |
390 |
390 |
71.5 |
- |
56 |
| 41 |
402 |
381 |
381 |
70.9 |
- |
55 |
| 40 |
392 |
371 |
371 |
70.4 |
- |
54 |
| 39 |
382 |
362 |
362 |
69.9 |
- |
52 |
| 38 |
372 |
353 |
353 |
69.4 |
- |
51 |
| 37 |
363 |
344 |
344 |
68.9 |
- |
50 |
| 36 |
354 |
336 |
336 |
68.4 |
(109.0) |
49 |
| 35 |
345 |
327 |
327 |
67.9 |
108.5 |
48 |
| 34 |
336 |
319 |
319 |
67.4 |
108.0 |
47 |
| 33 |
327 |
311 |
311 |
66.8 |
107.5 |
46 |
| 32 |
318 |
301 |
301 |
66.3 |
107.0 |
44 |
| 31 |
310 |
294 |
294 |
65.8 |
106.0 |
43 |
| 30 |
302 |
286 |
286 |
65.3 |
105.5 |
42 |
| 29 |
294 |
279 |
279 |
64.7 |
104.5 |
41 |
| 28 |
286 |
271 |
271 |
64.3 |
104.0 |
41 |
| 27 |
279 |
264 |
264 |
63.8 |
103.0 |
40 |
| 26 |
272 |
258 |
258 |
63.3 |
102.5 |
38 |
| 25 |
266 |
253 |
253 |
62.8 |
101.5 |
38 |
| 24 |
260 |
247 |
247 |
62.4 |
101.0 |
37 |
| 23 |
254 |
243 |
243 |
62.0 |
100.0 |
36 |
| 22 |
248 |
237 |
237 |
61.5 |
99.0 |
35 |
| 21 |
243 |
231 |
231 |
61.0 |
98.5 |
35 |
| 20 |
238 |
226 |
226 |
60.5 |
97.8 |
34 |
| (18) |
230 |
219 |
219 |
- |
96.7 |
33 |
| (16) |
222 |
212 |
212 |
- |
95.5 |
32 |
| (14) |
213 |
203 |
203 |
- |
93.9 |
31 |
| (12) |
204 |
194 |
194 |
- |
92.3 |
29 |
| (10) |
196 |
187 |
187 |
- |
90.7 |
28 |
| (8) |
188 |
179 |
179 |
- |
89.5 |
27 |
| (6) |
180 |
171 |
171 |
- |
87.1 |
26 |
| (4) |
173 |
165 |
165 |
- |
85.5 |
25 |
| (2) |
166 |
158 |
158 |
- |
83.5 |
24 |
| 0 |
160 |
152 |
152 |
- |
81.7 |
24 |
|