Hardness Conversion
August 7th, 2008These values are considered to be only a rough approximation.
|
Rockwell
HRB |
Rockwell
HRC |
Vickers
HV |
Brinell
HB |
Tensile
Strength N/mm2 |
|
90
|
86
|
285
|
||
|
56.2
|
100
|
95
|
320
|
|
|
62.3
|
110
|
95
|
320
|
|
|
66.7
|
120
|
114
|
385
|
|
|
71.2
|
130
|
124
|
415
|
|
|
75.0
|
140
|
133
|
450
|
|
|
78.7
|
150
|
143
|
480
|
|
|
81.7
|
160
|
152
|
510
|
|
|
85.0
|
170
|
162
|
545
|
|
|
87.1
|
180
|
171
|
575
|
|
|
89.5
|
190
|
181
|
610
|
|
|
91.5
|
200
|
190
|
640
|
|
|
93.5
|
210
|
199
|
675
|
|
|
95.0
|
220
|
209
|
705
|
|
|
96.7
|
230
|
219
|
740
|
|
|
98.1
|
240
|
228
|
770
|
|
|
115.1
|
250
|
238
|
800
|
|
|
23.1
|
255
|
242
|
820
|
|
|
24.8
|
265
|
252
|
850
|
|
|
26.4
|
275
|
261
|
880
|
|
|
27.1
|
280
|
266
|
900
|
|
|
28.5
|
290
|
276
|
930
|
|
|
29.2
|
295
|
280
|
950
|
|
|
31.0
|
310
|
295
|
995
|
|
|
32.2
|
320
|
304
|
1030
|
|
|
33.3
|
330
|
314
|
1060
|
|
|
34.4
|
340
|
323
|
1095
|
|
|
35.5
|
350
|
333
|
1125
|
|
|
36.6
|
360
|
342
|
1155
|
|
|
37.7
|
370
|
352
|
1190
|
|
|
38.8
|
380
|
361
|
1220
|
|
|
39.8
|
390
|
371
|
1255
|
|
|
40.8
|
400
|
380
|
1290
|
|
|
41.8
|
410
|
390
|
1320
|
|
|
42.7
|
420
|
399
|
1350
|
|
|
43.6
|
430
|
409
|
1385
|
|
|
44.5
|
440
|
418
|
1420
|
|
|
45.3
|
450
|
428
|
1455
|
|
|
46.1
|
460
|
437
|
1485
|
|
|
46.9
|
470
|
447
|
1520
|
|
|
47.7
|
480
|
456
|
1555
|
|
|
48.4
|
490
|
466
|
1595
|
|
|
49.1
|
500
|
475
|
1630
|
|
|
49.8
|
510
|
485
|
1665
|
|
|
50.5
|
520
|
494
|
1700
|
|
|
51.1
|
530
|
504
|
1740
|
|
|
51.7
|
540
|
513
|
1775
|
|
|
52.3
|
550
|
523
|
1810
|
|
|
53.0
|
560
|
532
|
1845
|
|
|
53.6
|
570
|
542
|
1880
|
|
|
54.1
|
580
|
551
|
1920
|
|
|
54.7
|
590
|
561
|
1955
|
|
|
55.2
|
600
|
570
|
1995
|
|
|
55.7
|
610
|
580
|
2030
|
|
|
56.3
|
620
|
589
|
2070
|
|
|
56.8
|
630
|
599
|
2105
|
|
|
57.3
|
640
|
608
|
2145
|
|
|
57.8
|
650
|
618
|
2180
|
|