Rockwell C Hardness Range |
Approximate Hardness Conversion Numbers for Non-Austenitic Steels, According to ASTM E-140
The Conversion Values contained herein should be considered approximate only and may be inaccurate for specific applications |
C |
A |
D |
15N |
30N |
45N |
Vickers |
Knoop |
Brinell |
Tensile |
150 kgt |
60 kgt |
100kgt |
15kgt |
30 kgt |
45 kgt |
Hardness |
Hardness |
Hardness |
Strength |
diamond |
diamond |
diamond |
diamond |
diamond |
diamond |
|
500gr |
3000kgt |
1000 lbs/ |
|
|
|
|
|
|
|
and over |
10mm ball |
square in |
68 |
85.6 |
76.9 |
93.2 |
84.4 |
75.4 |
940 |
920 |
.. |
.. |
67 |
85.0 |
76.1 |
92.9 |
83.6 |
74.2 |
900 |
895 |
.. |
.. |
66 |
84.5 |
75.4 |
92.5 |
82.8 |
73.3 |
865 |
870 |
.. |
.. |
65 |
83.9 |
74.5 |
92.2 |
81.9 |
72.0 |
832 |
846 |
(739) |
|
64 |
83.4 |
73.8 |
91.8 |
81.1 |
71.0 |
800 |
822 |
(722) |
|
63 |
82.8 |
73.0 |
91.4 |
80.1 |
69.9 |
772 |
799 |
(705) |
|
62 |
82.3 |
72.2 |
91.1 |
79.3 |
68.8 |
745 |
776 |
(688) |
|
61 |
81.8 |
71.5 |
90.7 |
78.4 |
67.7 |
720 |
754 |
(670) |
|
60 |
81.2 |
70.7 |
90.2 |
77.5 |
66.6 |
697 |
732 |
(654) |
|
59 |
80.7 |
69.9 |
89.8 |
76.6 |
65.5 |
674 |
710 |
(634) |
351 |
58 |
80.1 |
69.2 |
89.3 |
75.7 |
64.3 |
653 |
690 |
615 |
338 |
57 |
79.6 |
68.5 |
88.9 |
74.8 |
63.2 |
633 |
670 |
595 |
325 |
56 |
79.0 |
67.7 |
88.3 |
73.9 |
62.0 |
613 |
650 |
577 |
313 |
55 |
78.5 |
66.9 |
87.9 |
73.0 |
60.9 |
595 |
630 |
560 |
301 |
54 |
78.0 |
66.1 |
87.4 |
72.0 |
59.8 |
577 |
612 |
543 |
292 |
53 |
77.4 |
65.4 |
86.9 |
71.2 |
58.6 |
560 |
594 |
525 |
283 |
52 |
76.8 |
64.6 |
84.4 |
70.2 |
57.4 |
544 |
576 |
512 |
273 |
51 |
76.3 |
63.8 |
85.9 |
69.4 |
56.1 |
528 |
558 |
496 |
264 |
50 |
75.9 |
63.1 |
85.5 |
68.5 |
55.0 |
513 |
542 |
481 |
255 |
49 |
75.2 |
62.1 |
85.0 |
67.6 |
53.8 |
498 |
526 |
469 |
246 |
48 |
74.7 |
61.4 |
84.6 |
66.7 |
52.5 |
484 |
510 |
455 |
237 |
47 |
74.1 |
60.8 |
83.9 |
65.8 |
51.4 |
471 |
495 |
443 |
229 |
46 |
73.6 |
60 |
83.5 |
64.8 |
50.3 |
458 |
480 |
432 |
221 |
45 |
73.1 |
59.2 |
83.0 |
64.0 |
49.0 |
446 |
466 |
421 |
215 |
44 |
72.5 |
58.5 |
82.5 |
63.1 |
47.8 |
434 |
452 |
409 |
208 |
43 |
72.0 |
57.7 |
82.0 |
62.2 |
46.7 |
423 |
438 |
400 |
201 |
42 |
71.5 |
56.9 |
81.5 |
61.3 |
45.5 |
412 |
426 |
390 |
195 |
41 |
70.9 |
56.2 |
80.9 |
60.4 |
44.3 |
402 |
414 |
381 |
188 |
40 |
70.4 |
55.4 |
80.4 |
59.5 |
43.1 |
392 |
402 |
371 |
182 |
39 |
69.9 |
54.6 |
79.9 |
58.6 |
41.9 |
382 |
391 |
362 |
177 |
38 |
69.4 |
53.8 |
79.4 |
57.7 |
40.8 |
372 |
380 |
353 |
171 |
37 |
58.9 |
53.1 |
78.8 |
56.8 |
39.6 |
363 |
370 |
344 |
166 |
36 |
68.4 |
52.3 |
78.3 |
55.9 |
38.4 |
354 |
360 |
336 |
161 |
35 |
67.9 |
51.5 |
77.7 |
55.0 |
37.2 |
345 |
351 |
327 |
156 |
34 |
67.4 |
50.8 |
77.2 |
54.2 |
36.1 |
336 |
342 |
319 |
152 |
33 |
66.8 |
50.0 |
76.6 |
53.3 |
34.9 |
327 |
334 |
311 |
149 |
32 |
66.3 |
49.2 |
76.1 |
52.1 |
33.7 |
318 |
326 |
301 |
146 |
31 |
65.8 |
48.4 |
75.6 |
51.3 |
32.5 |
310 |
318 |
294 |
141 |
30 |
65.3 |
47.7 |
75.0 |
50.4 |
31.3 |
302 |
311 |
286 |
138 |
29 |
64.8 |
47.0 |
74.5 |
49.5 |
30.1 |
294 |
304 |
279 |
135 |
28 |
64.3 |
46.1 |
73.9 |
48.6 |
28.9 |
286 |
297 |
271 |
131 |
27 |
63.8 |
45.2 |
73.3 |
47.7 |
27.8 |
279 |
290 |
264 |
128 |
26 |
63.3 |
44.6 |
72.8 |
46.8 |
26.7 |
272 |
284 |
258 |
125 |
25 |
62.8 |
43.8 |
72.2 |
45.9 |
25.5 |
266 |
278 |
253 |
123 |
24 |
62.4 |
43.1 |
71.6 |
45.0 |
24.3 |
260 |
272 |
247 |
119 |
23 |
62.0 |
42.1 |
71.0 |
44.0 |
23.1 |
254 |
266 |
243 |
117 |
22 |
61.5 |
41.6 |
70.5 |
43.2 |
22.0 |
248 |
261 |
237 |
115 |
21 |
61.0 |
40.9 |
69.9 |
42.3 |
20.7 |
243 |
256 |
231 |
112 |
20 |
60.5 |
40.1 |
69.4 |
41.5 |
19.6 |
238 |
251 |
226 |
110 |
|
|
|
|
|
|
|
|
|
|
|
Rockwell B Hardness Range |
Approximate Hardness Conversion Numbers for Non-Austenitic Steels, according to ASTM E-140
The conversion values contained herein should be considered approximate only and may be inaccurate for Specific applications. |
|
Rockwell |
|
Superficial Rockwell |
|
Vickers |
Knoop |
Brinell |
Tensile |
Brinelll |
B |
A |
E |
15T |
30T |
45T |
Hardness |
Hardness |
Hardness |
Strength |
Hardness |
100kgf |
60 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kg f |
|
500gf |
3000 kgf |
1000 lbs/ |
500 kgf |
1/16"ball |
diamond |
1/8" ball |
1/16" ball |
1/16"ball |
1/16" ball |
|
and over |
10mm ball |
square in |
10mm ball |
100 |
61.5 |
|
93.1 |
83.1 |
72.9 |
240 |
261 |
240 |
116 |
201 |
99 |
60.9 |
|
82.8 |
82.5 |
71.9 |
234 |
246 |
234 |
114 |
195 |
98 |
602 |
|
92.5 |
81.8 |
709 |
228 |
241 |
228 |
109 |
189 |
97 |
59.5 |
|
92.1 |
81.1 |
699 |
222 |
236 |
222 |
105 |
184 |
96 |
58.9 |
|
91.8 |
80.4 |
689 |
216 |
231 |
216 |
102 |
179 |
95 |
58.3 |
|
91.5 |
79.8 |
67.9 |
210 |
226 |
210 |
100 |
175 |
94 |
57.6 |
|
91.2 |
79.1 |
669 |
205 |
221 |
205 |
98 |
171 |
93 |
57 |
|
90.8 |
784 |
659 |
200 |
216 |
200 |
94 |
167 |
92 |
56.4 |
|
90.5 |
77.8 |
64.8 |
195 |
211 |
195 |
92 |
163 |
91 |
55.8 |
|
90.2 |
77.1 |
63.8 |
190 |
206 |
190 |
90 |
160 |
90 |
55.2 |
|
89.9 |
76.4 |
62.8 |
186 |
201 |
186 |
89 |
157 |
89 |
54.6 |
|
89.5 |
76.8 |
61.8 |
180 |
196 |
180 |
88 |
164 |
88 |
64.0 |
|
89.2 |
75.1 |
60.8 |
176 |
192 |
176 |
86 |
151 |
87 |
53.4 |
|
88.9 |
74.4 |
59.8 |
172 |
188 |
172 |
84 |
148 |
86 |
52.8 |
|
88.6 |
73.8 |
58.8 |
169 |
184 |
169 |
83 |
145 |
85 |
52.3 |
|
88.2 |
73.1 |
57.8 |
165 |
180 |
165 |
82 |
142 |
84 |
51.7 |
|
87.9 |
72.4 |
56.8 |
162 |
176 |
162 |
81 |
140 |
83 |
51.1 |
|
87.6 |
71.8 |
55.8 |
159 |
173 |
159 |
80 |
137 |
82 |
50.6 |
|
87.3 |
71.1 |
54.8 |
156 |
170 |
156 |
76 |
135 |
81 |
50 |
|
86.9 |
70.4 |
53.8 |
153 |
167 |
153 |
73 |
133 |
80 |
49.5 |
|
86.6 |
69.7 |
52.8 |
150 |
164 |
150 |
72 |
130 |
79 |
48.9 |
|
86.3 |
69.1 |
51.8 |
147 |
161 |
147 |
70 |
128 |
78 |
48.4 |
|
86.0 |
68.4 |
50.8 |
144 |
158 |
144 |
69 |
126 |
77 |
47.9 |
|
85.6 |
67.7 |
49.8 |
141 |
155 |
141 |
68 |
124 |
76 |
47.3 |
|
85.3 |
67.1 |
48.8 |
139 |
152 |
139 |
67 |
122 |
75 |
46.8 |
|
86.0 |
66.4 |
47.8 |
137 |
150 |
137 |
66 |
120 |
74 |
46.3 |
|
84.7 |
65.7 |
46.8 |
135 |
147 |
135 |
66 |
118 |
73 |
45.8 |
|
84.3 |
65.1 |
45.8 |
132 |
145 |
132 |
64 |
116 |
72 |
45.3 |
|
84.0 |
64.4 |
44.8 |
130 |
143 |
130 |
63 |
114 |
71 |
44.8 |
100 |
83.7 |
63.7 |
43.8 |
127 |
141 |
127 |
62 |
112 |
70 |
44.3 |
99.5 |
83.4 |
63.1 |
42.8 |
125 |
139 |
125 |
61 |
110 |
69 |
43.8 |
99.0 |
83.0 |
62.4 |
41.8 |
123 |
137 |
123 |
60 |
109 |
68 |
43.3 |
98.0 |
82.7 |
61.7 |
40.8 |
121 |
135 |
121 |
59 |
108 |
67 |
42.8 |
97.5 |
82.4 |
61 |
39.8 |
119 |
133 |
119 |
58 |
106 |
66 |
42.3 |
97.0 |
82.1 |
60.4 |
38.7 |
117 |
131 |
117 |
57 |
104 |
65 |
41.8 |
96.0 |
81.8 |
59.7 |
37.7 |
116 |
129 |
116 |
56 |
102 |
64 |
41.4 |
95.5 |
81.4 |
59 |
36.7 |
114 |
127 |
114 |
|
100 |
63 |
40.9 |
95.0 |
81.1 |
58.4 |
35.7 |
112 |
125 |
112 |
|
99 |
62 |
40.4 |
94.5 |
80.8 |
57.7 |
34.7 |
110 |
124 |
110 |
|
98 |
61 |
40.0 |
93.5 |
80.5 |
57.0 |
33.7 |
108 |
122 |
108 |
|
96 |
60 |
39.5 |
93.0 |
80.1 |
56.4 |
32.7 |
107 |
120 |
107 |
|
95 |
59 |
39.0 |
92.5 |
79.8 |
55.7 |
31.7 |
106 |
118 |
106 |
|
94 |
58 |
38.6 |
92.0 |
79.5 |
55 |
30.7 |
104 |
117 |
104 |
|
92 |
57 |
38.1 |
91.0 |
79.2 |
54.4 |
2.97 |
103 |
115 |
103 |
|
91 |
56 |
37.7 |
90.6 |
78.8 |
53.7 |
28.7 |
101 |
114 |
101 |
|
90 |
55 |
37.2 |
90.0 |
78.6 |
53.0 |
27.7 |
100 |
112 |
100 |
|
89 |
54 |
36.8 |
89.5 |
78.2 |
52.4 |
26.7 |
|
111 |
|
|
87 |
53 |
36.3 |
89.0 |
77.9 |
51.7 |
26.7 |
|
110 |
|
|
86 |
52 |
35.9 |
88.0 |
77.5 |
51.0 |
24.7 |
|
109 |
|
|
85 |
51 |
35.5 |
87.6 |
77.2 |
50.3 |
23.7 |
|
108 |
|
|
84 |
50 |
35.0 |
87.0 |
76.9 |
49.7 |
22.7 |
|
107 |
|
|
83 |
49 |
34.6 |
86.5 |
76.6 |
49.0 |
21.7 |
|
106 |
|
|
82 |
48 |
34.1 |
85.5 |
76.2 |
48.3 |
20.7 |
|
105 |
|
|
81 |
47 |
33.7 |
85 |
75.9 |
47.7 |
19.7 |
|
104 |
|
|
80 |
46 |
33.3 |
84.6 |
76.6 |
47.0 |
18.7 |
|
103 |
|
|
80 |
45 |
32.9 |
84 |
76.3 |
46.3 |
17.7 |
|
102 |
|
|
79 |
44 |
32.4 |
83.5 |
74.9 |
45.7 |
16.7 |
|
101 |
|
|
78 |
43 |
32.0 |
82.5 |
74.6 |
45.0 |
15.7 |
|
100 |
|
|
77 |
42 |
31.6 |
82 |
74.3 |
44.3 |
14.7 |
|
99 |
|
|
76 |
41 |
31.2 |
81.5 |
74.0 |
43.7 |
13.6 |
|
98 |
|
|
75 |
40 |
30.7 |
81 |
73.6 |
43.0 |
12.6 |
|
97 |
|
|
75 |
39 |
30.3 |
80 |
73.3 |
42.3 |
11.6 |
|
96 |
|
|
74 |
38 |
29.9 |
79.5 |
73.0 |
41.6 |
10.6 |
|
95 |
|
|
73 |
37 |
29.5 |
79 |
72.7 |
41.0 |
9.6 |
|
94 |
|
|
72 |
36 |
29.1 |
78.5 |
72.3 |
40.3 |
8.6 |
|
93 |
|
|
72 |
35 |
28.7 |
78.0 |
72.0 |
39.6 |
7.6 |
|
92 |
|
|
71 |
34 |
28.2 |
77.0 |
71.7 |
39.0 |
6.6 |
|
91 |
|
|
70 |
33 |
27.8 |
76.6 |
71.4 |
38.3 |
5.6 |
|
90 |
|
|
69 |
32 |
27.4 |
76.0 |
71.0 |
37.6 |
4.6 |
|
89 |
|
|
69 |
31 |
27.0 |
75.5 |
70.7 |
37.0 |
3.6 |
|
88 |
|
|
68 |
30 |
26.6 |
75.0 |
70.4 |
36.3 |
2.6 |
|
87 |
|
|
67 |
|
Hardness values in brackets are outside the range recommended for Brinell testing in ASTM E-10.
The above table is from ASTM E-110 except values for E-scale and Tensile Strength which are not from or according to ASTM Standards.
Reprinted from the Annual Book of ASTM Standards, copyright American Society for Testing and Materials. |
100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 |