MITSUBISHI MATERIALS CORPORATION
BACK

HARDNESS COMPARISON TABLE

HARDNESS CONVERSION NUMBERS OF STEEL
Brinell Hardness (HB),
10mm Ball,
Load:3000kgf		 Vickers
Hardness
(HV)rs		 Rockwell Hardness (3) Shore
Hardness
(HS)		 Tensile
Strength
(Approx.)

MPa
(2)
Standard
Ball		 Tungsten
Carbide
Ball		 A Scale,
Load:60kgf,
Diamond Point
(HRA)
 B Scale,
Load: 100kgf,
1/16"Ball
(HRB)
 C Scale,
Load: 150kgf,
Diamond Point
(HRC)
 D Scale,
Load:100kgf,
Diamond Point
(HRD)
─
─
─
─
─
 ─
─
─
(767)
(757)		 940
920
900
880
860
 85.6
85.3
85.0
84.7
84.4		 ─
─
─
─
─		 68.0
67.5
67.0
66.4
65.9		 76.9
76.5
76.1
75.7
75.3		 97
96
95
93
92		 ─
─
─
─
─
─
─
─
─
─
─
 (745)
(733)
(722)
(712)
(710)
(698)
 840
820
800
─
780
760
 84.1
83.8
83.4
─
83.0
82.6		 ─
─
─
─
─
─		 65.3
64.7
64.0
─
63.3
62.5		 74.8
74.3
73.8
─
73.3
72.6		 91
90
88
─
87
86		 ─
─
─
─
─
─
─
─
─
─
─
 (684)
(682)
(670)
(656)
(653)
 740
737
720
700
697		 82.2
82.2
81.8
81.3
81.2		 ─
─
─
─
─		 61.8
61.7
61.0
60.1
60.0		 72.1
72.0
71.5
70.8
70.7		 ─
84
83
─
81		 ─
─
─
─
─
─
─
─
─
 (647)
(638)
630
627		 690
680
670
667		 81.1
80.8
80.6
80.5		 ─
─
─
─		 59.7
59.2
58.8
58.7		 70.5
70.1
69.8
69.7		 ─
80
─
79		 ─
─
─
─
─
─
 ─
601		 677
640		 80.7
79.8		 ─
─		 59.1
57.3		 70.0
68.7		 ─
77		 ─
─
─
─
 ─
578		 640
615		 79.8
79.1		 ─
─		 57.3
56.0		 68.7
67.7		 ─
75		 ─
─
─
─
 ─
555		 607
591		 78.8
78.4		 ─
─		 55.6
54.7		 67.4
66.7		 ─
73		 ─
2055
─
─
 ─
534		 579
569		 78.0
77.8		 ─
─		 54.0
53.5		 66.1
65.8		 ─
71		 2015
1985
─
─
 ─
514		 533
547		 77.1
76.9		 ─
─		 52.5
52.1		 65.0
64.7		 ─
70		 1915
1890
(495)
─

 ─
─
495		 539
530
528		 76.7
76.4
76.3		 ─
─
─		 51.6
51.1
51.0		 64.3
63.9
63.8		 ─
─
68		 1855
1825
1820
(477)
─

 ─
─
477		 516
508
508		 75.9
75.6
75.6		 ─
─
─		 50.3
49.6
49.6		 63.2
62.7
62.7		 ─
─
66		 1780
1740
1740
(461)
─


 ─
─
461		 495
491
491
 75.1
74.9
74.9		 ─
─
─		 48.8
48.5
48.5		 61.9
61.7
61.7
 ─
─
65		 1680
1670
1670
444
─
─
 ─
─
444		 474
472
472		 74.3
74.2
74.2		 ─
─
─		 47.2
47.1
47.1		 61.0
60.8
60.8		 ─
─
63		 1595
1585
1585
429
415
401
388
375		 429
415
401
388
375		 455
440
425
410
396		 73.4
72.8
72.0
71.4
70.6		 ─
─
─
─
─		 45.7
44.5
43.1
41.8
40.4		 59.7
58.8
57.8
56.8
55.7		 61
59
58
56
54		 1510
1460
1390
1330
1270
363
352
341
331
321		 363
352
341
331
321		 383
372
360
350
339		 70.0
69.3
68.7
68.1
67.5		 ─
(110.0)
(109.0)
(108.5)
(108.0)
 39.1
37.9
36.6
35.5
34.3		 54.6
53.8
52.8
51.9
51.0		 52
51
50
48
47		 1220
1180
1130
1095
1060
331
302
293
285
277		 331
302
293
285
277		 328
319
309
301
292		 66.9
66.3
65.7
65.3
64.6		 (107.5)
(107.0)
(106.0)
(105.5)
(104.5)
 33.1
32.1
30.9
29.9
28.8		 50.0
49.3
48.3
47.6
46.7		 46
45
43
─
41		 1025
1005
970
950
925
269
262
255
248
241		 269
262
255
248
241		 284
276
269
261
253		 64.1
63.6
63.0
62.5
61.8		 (104.0)
(103.0)
(102.0)
(101.0)
100		 27.6
26.6
25.4
24.2
22.8		 45.9
45.0
44.2
43.2
42.0		 40
39
38
37
36		 895
875
850
825
800
235
229
223
217
212		 235
229
223
217
212		 247
241
234
228
222		 61.4
60.8
─
─
─		 99.0
98.2
97.3
96.4
95.5		 21.7
20.5
(18.8)
(17.5)
(16.0)
 41.4
40.5
─
─
─		 35
34
─
33
─		 785
765
─
725
705
207
201
197
192
187		 207
201
197
192
187		 218
212
207
202
196		 ─
─
─
─
─		 94.6
93.8
92.8
91.9
90.7		 (15.2)
(13.8)
(12.7)
(11.5)
(10.0)
 ─
─
─
─
─		 32
31
30
29
─		 690
675
655
640
620
183
179
174
170
167		 183
179
174
170
167		 192
188
182
178
175		 ─
─
─
─
─		 90.0
89.0
87.8
86.8
86.0		 (9.0)
(8.0)
(6.4)
(5.4)
(4.4)
 ─
─
─
─
─		 28
27
─
26
─		 615
600
585
570
560
163
156
149
143
137		 163
156
149
143
137		 171
163
156
150
143		 ─
─
─
─
─		 85.0
82.9
80.8
78.7
76.4		 (3.3)
(0.9)
─
─
─		 ─
─
─
─
─		 25
─
23
22
21		 545
525
505
490
460
131
126
121
116
111		 131
126
121
116
111		 137
132
127
122
117		 ─
─
─
─
─		 74.0
72.0
69.8
67.6
65.7		 ─
─
─
─
─		 ─
─
─
─
─		 ─
20
19
18
15		 450
435
415
400
385
(Note 1)
The above list is the same as that of AMS Metals Hand book with tensile strength in approximate metric value and Brinell hardness over a recommended range.
(Note 2)
1MPa=1N/mm2
(Note 3)
Figures in ( ) are rarely used and are included for reference. This list has been taken from JIS Handbook Steel I.