|
| |
HARDNESS
CONVERSION TABLE FOR CARBON & ALLOY STEELS All values
are approximate
|
Brinell Hardness Number (Carbide
ball) |
Rockwell Hardness Numbers |
Tensile Strength |
|
C Scale |
A Scale |
15N Scale Superficial |
B Scale |
30T Scale Superficial |
1000 Lb/Sq In |
kgf/mm |
|
- |
66 |
84.5 |
92.5 |
- |
- |
- |
- |
|
722 |
64 |
83.4 |
91.8 |
- |
- |
- |
- |
|
688 |
62 |
82.3 |
91.1 |
- |
- |
- |
- |
|
654 |
60 |
81.2 |
90.2 |
- |
- |
- |
- |
|
615 |
58 |
80.1 |
89.3 |
- |
- |
- |
- |
|
577 |
56 |
79.0 |
88.3 |
- |
- |
313 |
220 |
|
543 |
54 |
78.0 |
87.4 |
- |
- |
292 |
205 |
|
512 |
52 |
76.8 |
86.4 |
- |
- |
273 |
192 |
|
481 |
50 |
75.9 |
85.5 |
- |
- |
255 |
179 |
|
455 |
48 |
74.7 |
84.5 |
- |
- |
237 |
167 |
|
443 |
47 |
74.1 |
83.9 |
- |
- |
229 |
161 |
|
432 |
46 |
73.6 |
83.5 |
- |
- |
222 |
156 |
|
421 |
45 |
73.1 |
83.0 |
- |
- |
215 |
151 |
|
409 |
44 |
72.5 |
82.5 |
- |
- |
208 |
146 |
|
400 |
43 |
72.0 |
82.0 |
- |
- |
201 |
141 |
|
390 |
42 |
71.5 |
81.5 |
- |
- |
194 |
136 |
|
381 |
41 |
70.9 |
80.9 |
- |
- |
188 |
132 |
|
371 |
40 |
70.4 |
80.4 |
- |
- |
181 |
127 |
|
362 |
39 |
69.9 |
79.9 |
- |
- |
176 |
124 |
|
353 |
38 |
69.4 |
79.4 |
- |
- |
171 |
120 |
|
344 |
37 |
68.9 |
78.8 |
- |
- |
167 |
117 |
|
336 |
36 |
68.4 |
78.3 |
- |
- |
162 |
114 |
|
327 |
35 |
67.9 |
77.7 |
- |
- |
157 |
110 |
|
319 |
34 |
67.4 |
77.2 |
- |
- |
153 |
108 |
|
311 |
33 |
66.8 |
76.6 |
- |
- |
149 |
105 |
|
301 |
32 |
66.3 |
76.1 |
- |
- |
145 |
102 |
|
294 |
31 |
65.8 |
75.6 |
- |
- |
142 |
100 |
|
286 |
30 |
65.3 |
75.0 |
- |
- |
138 |
97 |
|
279 |
29 |
64.7 |
74.5 |
- |
- |
135 |
95 |
|
271 |
28 |
64.3 |
73.9 |
- |
- |
132 |
93 |
|
264 |
27 |
63.8 |
73.3 |
- |
- |
128 |
90 |
|
258 |
26 |
63.3 |
72.8 |
- |
- |
125 |
88 |
|
253 |
25 |
62.8 |
72.2 |
- |
- |
122 |
86 |
|
247 |
24 |
62.4 |
71.6 |
- |
- |
120 |
84 |
|
243 |
23 |
62.0 |
71.0 |
- |
- |
117 |
82 |
|
240 |
- |
- |
- |
100 |
82.0 |
116 |
82 |
|
234 |
- |
- |
- |
99 |
81.5 |
112 |
79 |
|
222 |
- |
- |
- |
97 |
80.5 |
106 |
75 |
|
210 |
- |
- |
- |
95 |
79.0 |
101 |
71 |
|
200 |
- |
- |
- |
93 |
78.0 |
96 |
67 |
|
195 |
- |
- |
- |
92 |
77.5 |
93 |
65 |
|
185 |
- |
- |
- |
90 |
76.0 |
89 |
63 |
|
176 |
- |
- |
- |
88 |
75.0 |
85 |
60 |
|
169 |
- |
- |
- |
86 |
74.0 |
81 |
57 |
|
162 |
- |
- |
- |
84 |
73.0 |
78 |
55 |
|
156 |
- |
- |
- |
82 |
71.5 |
75 |
53 |
|
150 |
- |
- |
- |
80 |
70.0 |
72 |
51 |
|
144 |
- |
- |
- |
78 |
69.0 |
- |
- |
|
139 |
- |
- |
- |
76 |
67.5 |
- |
- |
|
135 |
- |
- |
- |
74 |
66.0 |
- |
- |
|
130 |
- |
- |
- |
72 |
65.0 |
- |
- |
|
125 |
- |
- |
- |
70 |
63.5 |
- |
- |
|
121 |
- |
- |
- |
68 |
62.0 |
- |
- |
|
117 |
- |
- |
- |
66 |
60.5 |
- |
- |
|
114 |
- |
- |
- |
64 |
59.5 |
- |
- |
|