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Hardness Ranges (Heat Treated Steel)

Heat Treated
Q(n/mm2)
R(n/mm2)
S(n/mm2)
T(n/mm2)
U(n/mm2)
V(n/mm2)
W(n/mm2)
X(n/mm2)
Z(n/mm2)
Tensile Strength

625-775

700-850

775-925

850-1000

925-1075

1000-1150

1075-1225

1150-1300

1550

Hardness Brinell
179-229
201-225
223-277
248-302
269-331
293-352
311-375
345-401
444

This table shows approximate hardness of steel using Brinell, Vickers scales and Rockwell B and C.

Reference Table: Steel hardness conversion chart - all values approximate.

Brinell Hardness
HB
Rockwell
HRC
Rockwell
HRB
Vickers
HV
N/mm²
 
 
 
 
800
72
 
 
780
71
 
 
760
70
 
 
752
69
 
 
745
68
 
 
746
67
 
 
735
66
 
 
711
65
 
 
695
64
 
 
681
63
 
 
658
62
 
 
642
61
 
 
627
60
 
 
613
59
 
 
601
58
 
746
592
57
 
727
572
56
 
694
552
55
 
649
534
54
120
589
513
53
119
567
504
52
118
549
486
51
118
531
469
50
117
505
468
49
117
497
456
48
116
490
1569
445
47
115
474
1520
430
46
115
458
1471
419
45
114
448
1447
415
44
114
438
1422
402
43
114
424
1390
388
42
113
406
1363
375
41
112
393
1314
373
40
111
388
1265
360
39
111
376
1236
348
38
110
361
1187
341
37
109
351
1157
331
36
109
342
1118
322
35
108
332
1089
314
34
108
320
1049
308
33
107
311
1035
300
32
107
303
1020
290
31
106
292
990
277
30
105
285
971
271
29
104
277
941
264
28
103
271
892
262
27
103
262
880
255
26
102
258
870
250
25
101
255
853
245
24
100
252
838
240
23
100
247
824
233
22
99
241
794
229
21
98
235
775
223
20
97
227
755
216
19
96
222
716
212
18
95
218
706
208
17
95
210
696
203
16
94
201
680
199
15
93
199
667
191
14
92
197
657
190
13
92
186
648
186
12
91
184
637
183
11
90
183
617
180
10
89
180
608
175
9
88
178
685
170
7
87
175
559
167
6
86
172
555
166
5
86
168
549
163
4
85
162
539
160
3
84
160
535
156
2
83
158
530
154
1
82
152
515
149
 
81
149
500
147
 
80
147
490
143
 
79
146
482
141
 
78
144
481
139
 
77
142
480
137
 
76
140
475
135
 
75
137
467
131
 
74
134
461
127
 
72
129
451
121
 
70
127
431
116
 
68
124
422
114
 
67
121
412
111
 
66
118
402
107
 
64
115
382
105
 
62
112
378
103
 
61
108
373
95
 
56
104
90
 
52
95
81
 
41
85
76
 
37
80
Brinell
HB
Rockwell
HRC
Rockwell
HRB
Vickers
HV
N/mm²
3000kg
10mm Ball
150kg 
Brale
100kg
1/16" Ball

Diamond Pyramid 
120kg

Tensile strength (Approx)

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