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Comparison table of carbon steel hardness values ​​and tensile strength

Table 1: Carbon Steel — Hardness and Strength Conversion

Rockwell Hardness (HRC)
Rockwell Hardness (HRA)
Vickers Hardness (HV)
Brinell Hardness (HBS)
Brinell Hardness (HBW)
Tensile Strength (N/mm²)
20
60.2
226
225
/
774
20.5
60.4
228
227
/
784
21
60.7
230
229
/
793
21.5
61
233
232
/
803
22
61.2
235
234
/
813
22.5
61.5
238
237
/
823
23
61.7
241
240
/
833
23.5
62
244
242
/
843
24
62.2
247
245
/
854
24.5
62.5
250
248
/
864
25
62.8
253
251
/
875
25.5
63
256
254
/
886
26
63.3
259
257
/
897
26.5
63.5
262
260
/
908
27
63.8
266
263
/
919
27.5
64
269
266
/
930
28
64.3
273
269
/
942
28.5
64.6
276
273
/
954
29
64.8
280
276
/
965
29.5
65.1
284
280
/
977
30
65.3
288
283
/
989
30.5
65.6
292
287
/
1002
31
65.8
296
291
/
1014
31.5
66.1
300
294
/
1027
32
66.4
304
298
/
1039
32.5
66.6
308
302
/
1052
33
66.9
313
306
/
1065
33.5
67.1
317
310
/
1078
34
67.4
321
314
/
1092
34.5
67.7
326
318
/
1105
35
67.9
331
323
/
1119
35.5
68.2
335
327
/
1133
36
68.4
340
332
/
1147
36.5
68.7
345
336
/
1162
37
69
350
341
/
1177
37.5
69.2
355
345
/
1192
38
69.5
360
350
/
1207
38.5
69.7
365
355
/
1222
39
70
371
360
/
1238
39.5
70.3
376
365
/
1254
40
70.5
381
370
370
1271
40.5
70.8
387
375
375
1288
41
71.1
393
380
381
1305
41.5
71.3
398
385
386
1322
42
71.6
404
391
392
1340
42.5
71.8
410
396
397
1359
43
72.1
416
401
403
1378
43.5
72.4
422
407
409
1397
44
72.6
428
413
415
1417
44.5
72.9
435
418
422
1438
45
73.2
441
424
428
1459
45.5
73.4
448
430
435
1481
46
73.7
454
436
441
1503
46.5
73.9
461
442
448
1526
47
74.2
468
449
455
1550
47.5
74.5
475
/
463
1575
48
74.7
482
/
470
1600
48.5
75
489
/
478
1626
49
75.3
497
/
486
1653
49.5
75.5
504
/
494
1681
50
75.8
512
/
502
1710

Table 2: Low Carbon Steel — Hardness and Strength Conversion

Rockwell Hardness (HRB)
Vickers Hardness (HV)
Brinell Hardness (HBS)
Tensile Strength (N/mm²)
60
105
102
375
60.5
105
102
377
61
106
103
379
61.5
107
103
381
62
108
104
382
62.5
108
104
384
63
109
105
386
63.5
110
105
388
64
110
106
390
64.5
111
106
393
65
112
107
395
65.5
113
107
397
66
114
108
399
66.5
115
108
402
67
115
109
404
67.5
116
110
407
68
117
110
409
68.5
118
111
412
69
119
112
415
69.5
120
112
418
70
121
113
421
70.5
122
114
424
71
123
115
427
71.5
124
115
430
72
125
116
433
72.5
126
117
437
73
128
118
440
73.5
129
119
444
74
130
120
447
74.5
131
121
451
75
132
122
455
75.5
134
123
459
76
135
124
463
76.5
136
125
467
77
138
126
471
77.5
139
127
475
78
140
128
480
78.5
142
129
484
79
143
130
489
79.5
145
132
493
80
146
133
498
80.5
148
134
503
81
149
136
508
81.5
151
137
513
82
152
138
518
82.5
154
140
523
83
156
152
529
83.5
157
154
534
84
159
155
540
84.5
161
156
546
85
163
158
551
85.5
165
159
557
86
166
161
563
86.5
168
163
570
87
170
164
576
87.5
172
166
582
88
174
168
589
88.5
176
170
596
89
178
172
603
89.5
180
174
609
90
183
176
617
90.5
185
178
624
91
187
180
631
91.5
189
182
639
92
191
184
646
92.5
194
187
654
93
196
189
662
93.5
199
192
670
94
201
195
678
94.5
203
197
686
95
206
200
695
95.5
208
203
703
96
211
206
712
96.5
214
209
721
97
216
212
730
97.5
219
215
739
98
222
218
749
98.5
225
222
758
99
227
226
768
99.5
230
229
778
100
233
232
788

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