Global Catalog Metric 8-16-23 web - Flipbook - Page 303
Hardness Conversion Chart
ROCKWELL
HARDNESS
(HRb)
ROCKWELL
HARDNESS
(HRc)
BRINELL
HARDNESS
(HB)
67
–
121
70
–
126
73
–
132
75
–
136
77
–
140
80
–
147
82
–
153
84
–
159
86
–
165
89
–
177
91
–
186
93
–
197
96
–
216
97
–
223
98
21
230
–
22
236
–
23
242
–
24
248
–
25
254
–
27
266
–
28
272
–
29
278
–
30
284
–
31
293
–
32
302
–
33
310
–
34
319
–
35
328
–
37
345
–
38
353
–
39
362
–
40
370
–
41
381
–
42
391
–
44
411
–
45
422
–
46
433
–
48
455
–
50
479
–
51
485
–
52
497
–
54
–
–
56
–
–
57
–
–
59
–
–
60
–
–
61
–
–
62
–
–
63
–
–
64
–
–
65
–
–
66
–
–
67
–
–
68
–
Conversions from each scale are approximate
https://kyocera-sgstool.co.uk/
VICKERS
HARDNESS
(HV)
TENSILE
STRENGTH
(N/mm2)
PSI
(1000lb/in2)
122
127
132
137
143
150
156
163
171
178
188
196
212
218
234
241
247
255
261
269
275
284
292
300
308
318
327
337
349
359
370
381
395
408
422
437
452
470
497
517
532
573
609
630
670
698
725
740
780
812
847
885
926
971
401
432
448
455
463
479
494
525
540
556
602
632
664
695
756
772
787
818
849
865
895
911
942
973
988
1019
1050
1096
1127
1158
1189
1235
1266
1312
1359
1420
1467
1513
1559
1621
1668
1729
1807
1884
1961
2039
–
–
–
–
–
–
–
–
58
63
65
66
67
69
72
76
78
81
88
92
97
101
110
112
114
118
123
125
130
132
136
141
143
147
152
159
163
168
172
179
183
190
197
206
212
219
226
235
241
250
262
273
284
295
–
–
–
–
–
–
–
–
2
