Hardness Conversion Table
| VICKERS
(FIRTH DIAMOND HARDNESS NUMBER)
|
ROCKWELL |
SUPERFICIAL ROCKWELL |
BRINELL |
TENSILE STRENGTH
EQUIV 1000PSI
|
| Diamond Brale |
1/16" Bull |
N Brale Penetrator |
10m/m ball |
| C |
A |
D |
B |
15N |
30N |
45N |
3000kgm load |
| 1865 |
80 |
92 |
87 |
|
97 |
92 |
87 |
Dia of ball impression (mm) |
Hardness |
|
| 1787 |
79 |
92 |
86 |
|
|
92 |
87 |
|
|
|
| 1710 |
78 |
91 |
85 |
|
96 |
91 |
86 |
|
|
|
| 1633 |
77 |
91 |
84 |
|
|
91 |
85 |
|
|
|
| 1556 |
76 |
90 |
83 |
|
96 |
90 |
84 |
|
|
|
| 1478 |
75 |
90 |
83 |
|
|
89 |
83 |
|
|
|
| 1400 |
74 |
89 |
82 |
|
95 |
89 |
82 |
|
|
|
| 1323 |
73 |
89 |
81 |
|
|
88 |
81 |
|
|
|
| 1245 |
72 |
88 |
80 |
|
95 |
87 |
80 |
|
|
|
| 1160 |
71 |
87 |
80 |
|
|
87 |
79 |
|
|
|
| 1076 |
70 |
87 |
79 |
|
94 |
86 |
78 |
|
|
|
| 1004 |
69 |
86 |
78 |
|
94 |
85 |
77 |
|
|
|
| 942 |
68 |
86 |
77 |
|
|
85 |
76 |
|
|
|
| 894 |
67 |
85 |
76 |
|
93 |
84 |
75 |
|
|
|
| 854 |
66 |
85 |
76 |
|
93 |
83 |
74 |
|
|
|
| 820 |
65 |
84 |
75 |
|
92 |
82 |
73 |
2.25 |
745 |
|
| 789 |
64 |
84 |
74 |
|
|
81 |
72 |
2.3 |
710 |
|
| 763 |
63 |
83 |
73 |
|
92 |
80 |
70 |
2.3 |
710 |
|
| 746 |
62 |
83 |
73 |
|
91 |
79 |
69 |
2.35 |
682 |
|
| 720 |
61 |
82 |
72 |
|
91 |
79 |
68 |
2.35 |
682 |
|
| 697 |
60 |
81 |
71 |
|
90 |
78 |
67 |
2.4 |
653 |
|
| 674 |
59 |
81 |
70 |
|
90 |
77 |
66 |
2.45 |
627 |
326 |
| 653 |
58 |
80 |
69 |
|
89 |
76 |
65 |
2.55 |
578 |
315 |
| 633 |
57 |
80 |
69 |
|
89 |
75 |
63 |
2.55 |
578 |
304 |
| 613 |
56 |
79 |
68 |
|
88 |
74 |
2 |
2.6 |
555 |
294 |
| 595 |
55 |
79 |
67 |
|
88 |
73 |
61 |
2.6 |
555 |
287 |
| 577 |
54 |
78 |
66 |
|
87 |
72 |
60 |
2.65 |
534 |
279 |
| 560 |
53 |
77 |
65 |
|
87 |
71 |
59 |
2.7 |
514 |
269 |
| 544 |
52 |
77 |
65 |
|
86 |
70 |
57 |
2.75 |
495 |
261 |
| 528 |
51 |
76 |
64 |
|
86 |
69 |
56 |
2.75 |
495 |
254 |
| 513 |
50 |
76 |
63 |
|
86 |
69 |
55 |
2.8 |
477 |
245 |
| 498 |
49 |
75 |
62 |
|
85 |
68 |
54 |
2.85 |
461 |
238 |
| 484 |
48 |
75 |
61 |
|
85 |
67 |
53 |
2.9 |
444 |
232 |
| 471 |
47 |
74 |
61 |
|
84 |
66 |
51 |
2.9 |
444 |
225 |
| 458 |
46 |
73 |
60 |
|
84 |
65 |
50 |
2.95 |
432 |
219 |
| 446 |
45 |
73 |
59 |
|
83 |
64 |
49 |
3 |
415 |
211 |
| 434 |
44 |
73 |
59 |
|
83 |
63 |
48 |
3 |
415 |
206 |
| 423 |
43 |
72 |
58 |
|
82 |
62 |
47 |
3.05 |
401 |
202 |
| 412 |
42 |
72 |
57 |
|
82 |
61 |
46 |
3.1 |
388 |
198 |
| 402 |
41 |
71 |
56 |
|
81 |
60 |
44 |
3.1 |
388 |
191 |
| 392 |
40 |
70 |
55 |
|
80 |
60 |
43 |
3.15 |
375 |
185 |
| 382 |
39 |
70 |
55 |
|
80 |
59 |
42 |
3.2 |
363 |
181 |
| 372 |
38 |
69 |
54 |
|
79 |
58 |
41 |
3.25 |
352 |
176 |
| 363 |
37 |
69 |
53 |
109 |
79 |
57 |
40 |
3.3 |
341 |
171 |
| 354 |
36 |
68 |
52 |
109 |
78 |
56 |
39 |
3.35 |
331 |
168 |
| 345 |
35 |
68 |
52 |
108 |
78 |
55 |
38 |
3.35 |
331 |
163 |
| 336 |
34 |
67 |
51 |
108 |
77 |
54 |
37 |
3.4 |
321 |
159 |
| 327 |
33 |
67 |
50 |
107 |
77 |
53 |
36 |
3.45 |
311 |
154 |
| 318 |
32 |
66 |
49 |
106 |
76 |
52 |
34 |
3.5 |
302 |
150 |
| 310 |
31 |
66 |
48 |
106 |
76 |
51 |
33 |
3.55 |
293 |
146 |
| 302 |
30 |
65 |
48 |
105 |
75 |
50 |
32 |
3.6 |
285 |
142 |
| 294 |
29 |
65 |
47 |
104 |
75 |
50 |
30 |
3.65 |
277 |
138 |
| 286 |
28 |
64 |
46 |
103 |
74 |
49 |
29 |
3.7 |
269 |
134 |
| 279 |
27 |
64 |
45 |
103 |
73 |
48 |
28 |
3.75 |
262 |
131 |
| 272 |
26 |
63 |
45 |
102 |
73 |
47 |
27 |
3.8 |
255 |
126 |
| 266 |
25 |
63 |
44 |
101 |
72 |
46 |
26 |
3.8 |
255 |
124 |
| 260 |
24 |
62 |
43 |
100 |
72 |
45 |
24 |
3.85 |
248 |
122 |
| 254 |
23 |
62 |
42 |
99 |
71 |
44 |
23 |
3.9 |
241 |
118 |
| 248 |
22 |
62 |
42 |
99 |
71 |
43 |
22 |
3.95 |
235 |
116 |
| 243 |
21 |
61 |
41 |
98 |
70 |
42 |
21 |
4 |
229 |
113 |
| 238 |
20 |
61 |
40 |
97 |
69 |
42 |
20 |
4.05 |
223 |
111 |
| 230 |
18 |
|
|
95 |
|
|
|
4.1 |
217 |
107 |
| 222 |
16 |
|
|
94 |
|
|
|
4.15 |
212 |
102 |
| 213 |
14 |
|
|
92 |
|
|
|
4.25 |
203 |
98 |
| 204 |
12 |
|
|
90 |
|
|
|
4.35 |
192 |
92 |
| 195 |
10 |
|
|
89 |
|
|
|
4.4 |
187 |
90 |
| 187 |
8 |
|
|
87 |
|
|
|
4.5 |
179 |
87 |
| 180 |
6 |
|
|
85 |
|
|
|
4.6 |
170 |
83 |
| 173 |
4 |
|
|
84 |
|
|
|
4.65 |
166 |
79 |
| 166 |
2 |
|
|
82 |
|
|
|
4.8 |
156 |
77 |
| 160 |
0 |
|
|
81 |
|
|
|
4.8 |
156 |
74 |
| 156 |
|
|
|
79 |
|
|
|
4.9 |
149 |
73 |
| 150 |
|
|
|
77 |
|
|
|
5 |
143 |
70 |
| 143 |
|
|
|
74 |
|
|
|
5.1 |
137 |
67 |
| 137 |
|
|
|
72 |
|
|
|
5.2 |
131 |
65 |
| 132 |
|
|
|
70 |
|
|
|
5.3 |
126 |
62 |
| 127 |
|
|
|
68 |
|
|
|
5.4 |
121 |
60 |
| 122 |
|
|
|
65 |
|
|
|
5.5 |
116 |
58 |
| 117 |
|
|
|
|
|
|
|
5.6 |
112 |
56 |