Note: Hardness conversions are approximate only, a
s different scales use different methods of testing
Brinell
Impression |
Brinell
Hardness |
Vickers
hardness |
Rockwell
Hardness
(HRB) |
Rockwell
Hardness
(HRC) |
Tensile Strength |
Equiv Rm tonf/in2 |
Equiv Rm
kgf/mm2 |
Equiv Rm
N/mm2 |
( Approx)
1000 psi |
Dia. mm |
HB |
HV |
B |
C |
2.50 |
601 |
640 |
- |
57.0 |
- |
- |
- |
328 |
2.55 |
578 |
615 |
- |
56.0 |
- |
- |
- |
313 |
2.60 | 555 | 591 | 120 | 54.5 | - | - | - | 298 |
2.65 | 534 | 569 | 119 | 53.5 | - | - | - | 288 |
2.70 | 514 | 547 | 119 | 52.0 | - | - | - | 274 |
2.75 | 495 | 528 | 117 | 51.0 | - | - | - | 264 |
2.80 | 477 | 508 | 117 | 49.5 | - | - | - | 252 |
2.85 |
461 |
491 |
116 |
48.5 |
101 |
160 |
1569 |
242 |
2.90 |
444 |
474 |
115 |
47.0 |
98 |
155 |
1520 |
230 |
2.95 |
429 |
455 |
115 |
45.5 |
95 |
150 |
1471 |
219 |
3.00 |
415 |
440 |
114 |
44.5 |
92 |
145 |
1422 |
212 |
3.05 |
401 |
425 |
113 |
43.0 |
88 |
139 |
1363 |
202 |
3.10 |
388 |
410 |
112 |
42.0 |
85 |
134 |
1314 |
193 |
3.15 |
375 |
396 |
112 |
40.5 |
82 |
129 |
1265 |
184 |
3.20 |
363 |
383 |
110 |
39.0 |
80 |
126 |
1236 |
177 |
3.25 |
352 |
372 |
110 |
38.0 |
77 |
121 |
1187 |
171 |
3.30 |
341 |
360 |
109 |
36.5 |
75 |
118 |
1157 |
164 |
3.35 |
331 |
350 |
109 |
35.5 |
73 |
114 |
1118 |
159 |
3.40 |
321 |
339 |
108 |
34.5 |
71 |
111 |
1089 |
153 |
3.45 |
311 |
328 |
108 |
33.0 |
68 |
107 |
1049 |
149 |
3.50 |
302 |
319 |
107 |
32.0 |
66 |
104 |
1020 |
146 |
3.55 |
293 |
309 |
106 |
31.0 |
64 |
101 |
990 |
141 |
3.60 |
285 |
301 |
105 |
30.0 |
63 |
99 |
971 |
138 |
3.65 |
277 |
292 |
104 |
29.0 |
61 |
96 |
941 |
134 |
3.70 |
269 |
284 |
104 |
27.5 |
59 |
93 |
912 |
130 |
3.75 |
262 |
276 |
103 |
26.5 |
58 |
91 |
892 |
127 |
3.80 |
255 |
269 |
102 |
25.5 |
56 |
89 |
873 |
124 |
3.85 |
248 |
261 |
102 |
24.0 |
55 |
87 |
853 |
120 |
3.90 |
241 |
253 |
100 |
23.0 |
53 |
84 |
824 |
116 |
3.95 |
235 |
247 |
99 |
22.0 |
51 |
81 |
794 |
114 |
4.00 |
229 |
241 |
98 |
20.5 |
50 |
79 |
775 |
111 |
4.05 |
223 |
235 |
97 |
- |
49 |
77 |
755 |
104 |
4.10 |
217 |
228 |
96 |
- |
48 |
76 |
745 |
103 |
4.15 |
212 |
223 |
96 |
- |
46 |
73 |
716 |
100 |
4.20 |
207 |
218 |
95 |
- |
45 |
71 |
696 |
99 |
4.30 |
197 |
208 |
93 |
- |
43 |
68 |
667 |
94 |
4.40 |
187 |
197 |
91 |
- |
41 |
65 |
637 |
90 |
4.50 |
179 |
189 |
89 |
- |
39 |
62 |
608 |
88 |
4.60 |
170 |
179 |
87 |
- |
36 |
57 |
559 |
84 |
4.70 |
163 |
172 |
85 |
- |
35 |
55 |
539 |
82 |
4.80 |
156 |
165 |
83 |
- |
34 |
54 |
530 |
80 |
4.90 |
149 |
157 |
81 |
- |
32 |
51 |
500 |
73 |
5.00 |
143 |
150 |
79 |
- |
31 |
49 |
481 |
71 |
5.10 |
137 |
144 |
77 |
- |
31 |
49 |
481 |
67 |
5.20 |
131 |
138 |
74 |
- |
30 |
47 |
461 |
65 |
5.30 |
126 |
133 |
72 |
- |
29 |
46 |
451 |
63 |
5.40 |
121 |
127 |
70 |
- |
28 |
44 |
431 |
60 |
5.50 |
116 |
122 |
68 |
- |
27 |
43 |
422 |
58 |
5.60 |
111 |
117 |
66 |
- |
26 |
41 |
402 |
56 |
Disclaimer:
This table lists approximate relationship of hardn
ess values to corresponding approximate tensile str
ength values of steels. Some compositions and proce
ssing
histories may deviate from these relationships. The
data in this table do not represent hardness-to-te
nsile strength conversions for austenitic, ferritic
, and martensitic stainless
steel. If more precise conversions are required, th
ey should be developed for each specific compositio
n and heat treatment. Related Rockwell superficial
hardness numbers, if of
interest, may be found in ASTM A 370-68.
Download PDF version of Cross reference for Hardness of steel.pdf
|