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Approximate hardness conversion for non-austenitic steels.*

BRINELL ROCKWELL VICKERS KNOOP (1kg load max)

 

 

Ultimate Tensile
Strength (ksi)

Indentation
Dia. (mm)
HBW
10/3000
HRC
HRB
HV
(HRC range)
HV
(HRB range)
HK
(HRC range)
HK
(HRB range)
Scroll down to view full table
2.45
627
58.6
-
664
-
703
-
346.2
2.50
601
57.3
-
638
-
677
-
328.9
2.55
578
56.1
-
615
-
652
-
313.7
2.60
555
54.8
-
591
-
627
-
298.4
2.65
534
53.5
-
569
-
603
-
287.5
2.70
514
52.2
-
548
-
579
-
274.5
2.75
495
50.9
-
528
-
556
-
263.4
2.80
477
49.6
-
508
-
533
-
251.8
2.85
461
48.3
-
491
-
513
-
241.7
2.90
444
46.9
-
472
-
492
-
230.4
2.95
429
45.7
-
456
-
474
-
219.8
3.00
415
44.4
-
440
-
456
-
211.5
3.05
401
43.1
-
425
-
439
-
201.8
3.10
388
41.8
-
411
-
424
-
192.7
3.15
375
40.5
-
397
-
408
-
184.4
3.20
363
39.3
-
383
-
394
-
177.6
3.25
352
38.1
-
372
-
382
-
170.4
3.30
341
36.8
-
360
-
369
-
164.1
3.35
331
35.7
-
349
-
358
-
158.2
3.40
321
34.4
-
338
-
347
-
153.0
3.45
311
33.0
-
327
-
334
-
149.0
3.50
302
32.0
-
318
-
327
-
146.3
3.55
293
30.8
-
308
-
317
-
140.6
3.60
285
29.7
-
300
-
309
-
137.6
3.65
277
28.6
-
291
-
301
-
134.0
3.70
269
27.4
-
283
-
293
-
130.1
3.75
262
26.3
-
275
-
286
-
127.0
3.80
255
25.2
-
268
-
279
-
123.8
3.85
248
24.1
-
261
-
272
-
119.7
3.90
241
22.9
100
254
241
266
253
116.3
3.95
235
21.8
99
247
235
260
248
114.3
4.00
229
20.8
98
241
229
254
242
110.0
4.05
223
19.7
97
238
223
251
237
105.5
4.10
217
-
96
-
217
-
232
102.3
4.15
212
-
95
-
212
-
227
100.7
4.20
207
-
95
-
207
-
222
98.8
4.25
201
-
93
-
201
-
217
94.8
4.30
197
-
93
-
197
-
213
92.8
4.35
192
-
92
-
192
-
208
90.8
4.40
187
-
90
-
187
-
202
89.4
4.45
183
-
89
-
183
-
198
88.6
4.50
179
-
89
-
179
-
194
87.5
4.55
174
-
87
-
174
-
189
85.0
4.60
170
-
86
-
170
-
185
83.3
4.65
167
-
85
-
167
-
182
82.5
4.70
163
-
84
-
163
-
178
81.3
4.75
159
-
83
-
159
-
173
80.0
4.80
156
-
82
-
156
-
170
77.0
4.85
152
-
81
-
152
-
166
72.7
4.90
149
-
80
-
149
-
163
71.3
4.95
146
-
79
-
146
-
160
69.7
5.00
143
-
78
-
143
-
157
68.7
5.05
140
-
76
-
140
-
152
67.5
5.10
137
-
75
-
137
-
151
66.0
5.15
134
-
74
-
134
-
147
64.7
5.20
131
-
73
-
131
-
144
63.5
5.25
128
-
71
-
128
-
141
62.3
5.30
126
-
70
-
126
-
139
61.5
5.35
123
-
69
-
123
-
137
60.0
5.40
121
-
68
-
121
-
135
59.0
5.45
118
-
66
-
118
-
132
57.5
 

*All conversions are based on ASTM E140-12bε1 and ASTM A370-13

Disclaimer: Although the information set forth herein is believed to be correct, Scot Forge makes no recommendation, or offers no warranty of any kind, with respect to the subject matter or its accuracy. Scot Forge specifically disclaims all warranties, expressed, implied or otherwise, including, without limitation, all warranties of merchantability, fitness or suitability for a particular purpose or application.

Copyright 2017 by Scot Forge Company, all rights reserved.

 

 

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