There are several hardness scale conversion systems, including BS 860 and ASTM E140.
The table shows a set of values that has been used for stainless steel and also includes a tensile strength (Ultimate Tensile Strength) comparison. The Rockwell B values are superimposed on this table using an approximation from ASTM E140 Table5, which compares Rockwell B and Brinell.
| Brinell Hardness (HB) |
Vickers Hardness (HV) |
Rockwell (HRB) |
Rockwell(HRC) |
Ultimate Tensile Strength (N/mm2) |
| - |
640 |
- |
57 |
- |
| - |
615 |
- |
56 |
- |
| - |
591 |
- |
54.5 |
- |
| - |
569 |
- |
53.5 |
- |
| - |
547 |
- |
52 |
- |
| - |
528 |
- |
51 |
- |
| - |
508 |
- |
49.5 |
- |
| - |
491 |
- |
48.5 |
1539 |
| 444 |
474 |
- |
47 |
1520 |
| 429 |
455 |
- |
45.5 |
1471 |
| 415 |
440 |
- |
44.5 |
1422 |
| 401 |
425 |
- |
43 |
1363 |
| 388 |
410 |
- |
42 |
1314 |
| 375 |
396 |
- |
40.5 |
1265 |
| 363 |
383 |
- |
39 |
1236 |
| 352 |
372 |
- |
38 |
1187 |
| 341 |
360 |
- |
36.5 |
1157 |
| 331 |
350 |
- |
35.5 |
1118 |
| 321 |
339 |
- |
34.5 |
1089 |
| 311 |
328 |
- |
33 |
1049 |
| 302 |
319 |
- |
32 |
1020 |
| 293 |
309 |
- |
31 |
990 |
| 285 |
301 |
- |
30 |
971 |
| 277 |
292 |
- |
29 |
941 |
| 269 |
284 |
- |
27.5 |
912 |
| 262 |
276 |
- |
26.5 |
892 |
| 255 |
269 |
100 |
25.5 |
873 |
| 248 |
261 |
99 |
24 |
853 |
| 241 |
253 |
98 |
23 |
824 |
| 235 |
247 |
97 |
22 |
794 |
| 229 |
241 |
96 |
20.5 |
775 |
| 223 |
235 |
- |
- |
755 |
| 217 |
228 |
95 |
- |
745 |
| 212 |
223 |
94 |
- |
716 |
| 207 |
218 |
93 |
- |
696 |
| 197 |
208 |
91 |
- |
667 |
| 187 |
197 |
89 |
- |
637 |
| 179 |
189 |
87 |
- |
608 |
| 170 |
179 |
85 |
- |
559 |
| 163 |
172 |
83 |
- |
539 |
| 156 |
165 |
81 |
- |
530 |
| 149 |
157 |
79 |
- |
500 |
| 143 |
150 |
77 |
- |
481 |
| 137 |
144 |
74 |
- |
471 |
| 131 |
138 |
72 |
- |
461 |
| 126 |
133 |
69 |
- |
451 |
| 121 |
127 |
67 |
- |
431 |
| 116 |
122 |
64 |
- |
422 |
| 111 |
117 |
61 |
- |
402 |
| 107 |
113 |
- |
- |
382 |
| 103 |
108 |
- |
- |
373 |
|