Brinell
Dia of
Impression
mm |
Brinell
Hardness
Number
HB |
Vickers
Hardness
Number
HV |
Rockwell
C Scale
Hardness
Number HRC |
Equiv.
Rm
tonf/in2 |
Equiv.
Rm
kgf/mm2 |
Equiv.
Rm
N/mm2 |
|
| |
|
832 |
65 |
|
|
|
| |
|
800 |
64 |
|
|
|
| |
|
772 |
63 |
|
|
|
| |
|
746 |
62 |
|
|
|
| |
|
697 |
60 |
|
|
|
| |
|
674 |
59 |
|
|
|
| |
|
653 |
58 |
|
|
|
| 2.50 |
(601) |
633 |
57 |
|
|
|
| 2.55 |
(578) |
615 |
56 |
|
|
|
| 2.60 |
(555) |
591 |
54.5 |
|
|
|
| 2.65 |
(534) |
569 |
53.5 |
|
|
|
| 2.70 |
(514) |
547 |
52 |
|
|
|
| 2.75 |
(495) |
528 |
51 |
|
|
|
| 2.80 |
(477) |
508 |
49.5 |
|
|
|
| 2.85 |
(461) |
491 |
48.5 |
101 |
160 |
1569 |
| 2.90 |
444 |
474 |
47 |
98 |
155 |
1520 |
| 2.95 |
429 |
455 |
45.5 |
95 |
150 |
1471 |
| 3.00 |
415 |
440 |
44.5 |
92 |
145 |
1422 |
|
| 3.05 |
401 |
425 |
43 |
88 |
139 |
1363 |
| 3.10 |
388 |
410 |
42 |
85 |
134 |
1314 |
| 3.15 |
375 |
396 |
40.5 |
82 |
129 |
1265 |
| 3.20 |
363 |
383 |
39 |
80 |
126 |
1236 |
| 3.25 |
352 |
372 |
38 |
77 |
121 |
1187 |
| 3.30 |
341 |
360 |
36.5 |
75 |
118 |
1157 |
| 3.35 |
331 |
350 |
35.5 |
73 |
114 |
1118 |
| 3.40 |
321 |
339 |
34.5 |
71 |
111 |
1089 |
| 3.45 |
311 |
328 |
33 |
68 |
107 |
1049 |
| 3.50 |
302 |
319 |
32 |
66 |
104 |
1020 |
| 3.55 |
293 |
309 |
31 |
64 |
101 |
990 |
| 3.60 |
285 |
301 |
30 |
63 |
99 |
971 |
| 3.65 |
277 |
392 |
29 |
61 |
96 |
941 |
| 3.70 |
269 |
284 |
27.5 |
59 |
93 |
912 |
| 3.75 |
262 |
276 |
26.5 |
58 |
91 |
892 |
| 3.80 |
255 |
269 |
25.5 |
56 |
89 |
873 |
| 3.85 |
248 |
261 |
24 |
55 |
87 |
853 |
| 3.90 |
241 |
253 |
23 |
53 |
84 |
824 |
| 3.95 |
235 |
247 |
22 |
51 |
81 |
794 |
| 4.00 |
229 |
241 |
20.5 |
50 |
79 |
775 |
| 4.05 |
223 |
235 |
(20) |
49 |
77 |
755 |
| 4.10 |
217 |
228 |
(19) |
48 |
76 |
745 |
| 4.15 |
212 |
223 |
(18) |
46 |
73 |
716 |
| 4.20 |
207 |
218 |
(17) |
45 |
71 |
696 |
| 4.30 |
197 |
208 |
(14) |
43 |
68 |
667 |
| 4.40 |
187 |
197 |
(12) |
41 |
65 |
637 |
| 4.50 |
179 |
189 |
(10) |
39 |
62 |
608 |
| 4.60 |
170 |
176 |
- |
36 |
57 |
559 |
| 4.70 |
163 |
172 |
- |
35 |
55 |
539 |
| 4.80 |
156 |
165 |
- |
34 |
54 |
530 |
| 4.90 |
149 |
157 |
- |
32 |
51 |
500 |
| 5.00 |
143 |
150 |
- |
31 |
49 |
481 |
| 5.10 |
137 |
144 |
- |
31 |
49 |
481 |
| 5.20 |
131 |
138 |
- |
30 |
47 |
461 |
| 5.30 |
126 |
133 |
- |
29 |
46 |
451 |
| 5.40 |
121 |
127 |
- |
28 |
44 |
431 |
| 5.50 |
116 |
122 |
- |
27 |
43 |
422 |
| 5.60 |
111 |
117 |
- |
26 |
41 |
402 |
| 5.70 |
107 |
113 |
- |
25 |
39 |
382 |
| 5.80 |
103 |
108 |
- |
24 |
38 |
373 |
The figures in brackets (over 450) require a tungsten Carbide
ball (BS240 - 1986).
HB to HV and HV to HRC conversions are based on A.S.T.M.E. 140.
Rockwell C. scale and tonf/in2 figures in brackets are for guidance
only.
| P |
= |
35 |
- |
40 ton/in2 |
= |
163 |
- |
207 |
HB |
| Q |
= |
40 |
- |
50 |
= |
197 |
- |
229 |
|
| R |
= |
45 |
- |
55 |
= |
207 |
- |
248 |
|
| S |
= |
50 |
- |
60 |
= |
229 |
- |
277 |
|
| T |
= |
55 |
- |
65 |
= |
248 |
- |
302 |
|
| U |
= |
60 |
- |
70 |
= |
277 |
- |
321 |
|
| V |
= |
65 |
- |
75 |
= |
302 |
- |
341 |
|
| W |
= |
70 |
- |
80 |
= |
321 |
- |
363 |
|
| X |
= |
75 |
- |
85 |
= |
341 |
- |
388 |
|
| Y |
= |
80 |
- |
90 |
= |
363 |
- |
401 |
|
| Z |
= |
100 |
+ |
|
= |
461 |
+ |
|
|
Based on BS970 Pt. 1 (1970)
| 3.6 |
= |
300-420 N/mm2 |
= |
27 ton/in2 max |
116 HB max. |
| 4.6/4.8 |
= |
400-520 |
= |
26-34 ton in2 |
111-156 HB |
| 5.6/5.8 |
= |
500-660 |
= |
32-43 |
149-197 |
| 6.6/6.8 |
= |
600-740 |
= |
39-48 |
179-217 |
| 8.8 |
= |
800-980 |
= |
51-64 |
235-293 |
| 9.8 |
= |
900-1025 |
= |
58-66 |
262-302 |
| 10.9 |
= |
1000-1150 |
= |
65-75 |
293-341 |
| 12.9 |
= |
1200 - 1375 |
= |
77-88 |
352-401 |
Based on ISO 898-1 (1988)
N/mm2=MN/M2=MPa
Kgf=mm2=Kp/mm2
|
