|
Appendix 2
Hardness Conversion Tables
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HARDNESS CONVERSION
TABLE (BASED ON BRINELL HARDNESS HB)
|
Brinell |
Brinell |
|
Rockwell Hardness |
Rockwell Superficial Hardness |
Approximate |
|
Indentation |
3000 kgf |
|
Rockwell A |
Rockwell B |
Rockwell C |
Rockwell D |
|
|
|
Tensile |
|
Diameter |
10 mm |
|
60 kgf |
100 kgf |
150 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Strength |
|
mm |
Ball |
Vickers |
Diamond |
1//16" ball |
Diamond |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
ksi (MPa) |
|
|
HB |
HV |
HRA |
HRB |
HRC |
HRD |
HR15N |
HR30N |
HR45N |
|
|
--- |
--- |
940 |
85.6 |
--- |
68.0 |
76.9 |
93.2 |
84.4 |
75.4 |
--- |
|
--- |
--- |
920 |
85.3 |
--- |
67.5 |
76.5 |
93.0 |
84.0 |
74.8 |
--- |
|
--- |
--- |
900 |
85.0 |
--- |
67.0 |
76.1 |
92.9 |
83.6 |
74.2 |
--- |
|
--- |
767 |
880 |
84.7 |
--- |
66.4 |
75.7 |
92.7 |
83.1 |
73.6 |
--- |
|
--- |
757 |
860 |
84.4 |
--- |
65.9 |
75.3 |
92.5 |
82.7 |
73.1 |
--- |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.25 |
745 |
840 |
84.1 |
--- |
65.3 |
74.8 |
92.3 |
82.2 |
72.2 |
--- |
|
--- |
733 |
820 |
83.8 |
--- |
64.7 |
74.3 |
92.1 |
81.7 |
71.8 |
--- |
|
--- |
722 |
800 |
83.4 |
--- |
64.0 |
73.8 |
91.8 |
81.1 |
71.0 |
--- |
|
2.30 |
712 |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
|
--- |
710 |
780 |
83.0 |
--- |
63.3 |
73.3 |
91.5 |
80.4 |
70.2 |
--- |
|
--- |
698 |
760 |
82.6 |
--- |
62.5 |
72.6 |
91.2 |
79.7 |
69.4 |
--- |
|
|
|
|
|
|
|
|
|
|
|
|
|
--- |
684 |
740 |
82.2 |
--- |
61.8 |
72.1 |
91.0 |
79.1 |
68. |
--- |
|
2.35 |
682 |
737 |
82.2 |
--- |
61.7 |
72.0 |
91.0 |
79.0 |
68.5 |
--- |
|
--- |
670 |
720 |
81.8 |
--- |
61.0 |
71.5 |
90.7 |
78.4 |
67.7 |
--- |
|
--- |
656 |
700 |
81.3 |
--- |
60.1 |
70.8 |
90.3 |
77.6 |
66.7 |
--- |
|
2.40 |
653 |
697 |
81.2 |
--- |
60.0 |
70.7 |
90.2 |
77.5 |
66.5 |
--- |
|
|
|
|
|
|
|
|
|
|
|
|
|
--- |
647 |
690 |
81.1 |
--- |
59.7 |
70.5 |
90.1 |
77.2 |
66.2 |
--- |
|
--- |
638 |
680 |
80.8 |
--- |
59.2 |
70.1 |
89.8 |
76.8 |
65.7 |
--- |
|
--- |
630 |
670 |
80.6 |
--- |
58.8 |
69.8 |
89.7 |
76.4 |
65.3 |
--- |
|
2.45 |
627 |
667 |
80.5 |
--- |
58.7 |
69.7 |
89.6 |
76.3 |
65.1 |
--- |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.50 |
---
601 |
677
640 |
80.7
79.8 |
---
--- |
59.1
57.3 |
70.0
68.7 |
89.8
89.0 |
76.8
75.1 |
65.7
63.5 |
---
--- |
|
Brinell |
Brinell |
|
Rockwell Hardness |
Rockwell Superficial Hardness |
Approximate |
|
Indentation |
3000 kgf |
|
Rockwell A |
Rockwell B |
Rockwell C |
Rockwell D |
|
|
|
Tensile |
|
Diameter |
10 mm |
|
60 kgf |
100 kgf |
150 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Strength |
|
mm |
Ball |
Vickers |
Diamond |
1//16" ball |
Diamond |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
ksi (MPa) |
|
|
HB |
HV |
HRA |
HRB |
HRC |
HRD |
HR15N |
HR30N |
HR45N |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.55 |
---
578 |
640
615 |
79.8
79.1 |
---
--- |
57.3
56.0 |
68.7
67.7 |
89.0
88.4 |
75.1
73.9 |
63.5
62.1 |
---
--- |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.60 |
---
555 |
607
591 |
78.8
78.4 |
---
--- |
55.6
54.7 |
67.4
66.7 |
88.1
87.8 |
73.5
72.7 |
61.6
60.6 |
---
2055 |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.65 |
---
534 |
579
569 |
78.0
77.8 |
---
--- |
54.0
53.5 |
66.1
65.8 |
87.5
87.2 |
72.0
71.6 |
59.8
59.2 |
2015
1985 |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.70 |
---
514 |
553
547 |
77.1
76.9 |
---
--- |
52.5
52.1 |
65.0
64.7 |
86.7
86.5 |
70.7
70.3 |
58.0
57.6 |
1915
1890 |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.75 |
---
--- 495 |
539
530 528 |
76.7
76.4 76.3 |
---
--- --- |
51.6
51.1 51.0 |
64.3
63.9 63.8 |
86.3
86.0 85.9 |
69.9
69.5 69.4 |
56.9
56.2 56.1 |
1855
1825 1820 |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.80 |
---
477 |
516
508 |
75.9
75.6 |
---
--- |
50.3
49.6 |
63.2
62.7 |
85.6
85.3 |
68.7
68.2 |
55.2
54.5 |
1780
1740 |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.85 |
---
461 |
495
491 |
75.1
74.9 |
---
--- |
48.8
48.5 |
61.9
61.7 |
84.9
84.7 |
67.4
67.2 |
53.5
53.2 |
1680
1670 |
|
|
|
|
|
|
|
|
|
|
|
|
|
2.90 |
---
444 |
474
472 |
74.3
74.2 |
---
--- |
47.2
47.1 |
61.0
60.8 |
84.1
84.0 |
66.0
65.8 |
51.7
51.5 |
1595
1585 |
|
Brinell |
Brinell |
|
Rockwell Hardness |
Rockwell Superficial Hardness |
Approximate |
|
Indentation |
3000 kgf |
|
Rockwell A |
Rockwell B |
Rockwell C |
Rockwell D |
|
|
|
Tensile |
|
Diameter |
10 mm |
|
60 kgf |
100 kgf |
150 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Strength |
|
mm |
Ball |
Vickers |
Diamond |
1//16" ball |
Diamond |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
ksi (MPa) |
|
|
HB |
HV |
HRA |
HRB |
HRC |
HRD |
HR15N |
HR30N |
HR45N |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.95 |
429 |
455 |
73.4 |
--- |
45.7 |
59.7 |
83.4 |
64.6 |
49.9 |
1510 |
|
3.00 |
415 |
440 |
72.8 |
--- |
44.5 |
58.8 |
82.8 |
63.5 |
48.4 |
1460 |
|
3.05 |
401 |
425 |
72.0 |
--- |
43.1 |
57.8 |
82.0 |
62.3 |
46.9 |
1390 |
|
|
|
|
|
|
|
|
|
|
|
|
|
3.10 |
388 |
410 |
71.4 |
--- |
41.8 |
56.8 |
81.4 |
61.1 |
45.3 |
1330 |
|
3.15 |
375 |
396 |
70.6 |
--- |
40.4 |
55.7 |
80.6 |
59.9 |
43.6 |
1270 |
|
3.20 |
363 |
383 |
70.0 |
--- |
39.1 |
54.6 |
80.0 |
58.7 |
42.0 |
1220 |
|
3.25 |
352 |
372 |
69.3 |
(110.0) |
37.9 |
53.8 |
79.3 |
57.6 |
40.5 |
1180 |
|
3.30 |
341 |
360 |
68.7 |
(109.0) |
36.6 |
52.8 |
78.6 |
56.4 |
39.1 |
1130 |
|
|
|
|
|
|
|
|
|
|
|
|
|
3.35 |
331 |
350 |
68.1 |
(108.5) |
35.5 |
51.9 |
78.0 |
55.4 |
37.8 |
1095 |
|
3.40 |
321 |
339 |
67.5 |
(108.0) |
34.3 |
51.0 |
77.3 |
54.3 |
36.4 |
1060 |
|
3.45 |
311 |
328 |
66.9 |
(107.5) |
33.1 |
50.0 |
76.7 |
53.3 |
34.4 |
1025 |
|
3.50 |
302 |
319 |
66.3 |
(107.0) |
32.1 |
49.3 |
76.1 |
52.2 |
33.8 |
1005 |
|
3.55 |
293 |
309 |
65.7 |
(106.0) |
30.9 |
48.3 |
75.5 |
51.2 |
32.4 |
970 |
|
|
|
|
|
|
|
|
|
|
|
|
|
3.60 |
285 |
301 |
65.3 |
(105.5) |
29.9 |
47.6 |
75.0 |
50.3 |
31.2 |
950 |
|
3.65 |
277 |
292 |
64.6 |
(104.5) |
28.8 |
46.7 |
74.4 |
49.3 |
29.9 |
925 |
|
3.70 |
269 |
284 |
64.1 |
(104.0) |
27.6 |
45.9 |
73.7 |
48.3 |
28.5 |
895 |
|
3.75 |
262 |
276 |
63.6 |
(103.0) |
26.6 |
45.0 |
73.1 |
47.3 |
27.3 |
875 |
|
3.80 |
255 |
269 |
63.0 |
(102.0) |
25.4 |
44.2 |
72.5 |
46.2 |
26.0 |
850 |
|
Brinell |
Brinell |
|
Rockwell Hardness |
Rockwell Superficial Hardness |
Approximate |
|
Indentation |
3000 kgf |
|
Rockwell A |
Rockwell B |
Rockwell C |
Rockwell D |
|
|
|
Tensile |
|
Diameter |
10 mm |
|
60 kgf |
100 kgf |
150 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Strength |
|
mm |
Ball |
Vickers |
Diamond |
1//16" ball |
Diamond |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
ksi (MPa) |
|
|
HB |
HV |
HRA |
HRB |
HRC |
HRD |
HR15N |
HR30N |
HR45N |
|
|
3.85 |
248 |
261 |
62.5 |
(101.0) |
24.2 |
43.2 |
71.7 |
45.1 |
24.5 |
825 |
|
3.90 |
241 |
253 |
61.8 |
100.0 |
22.8 |
42.0 |
70.9 |
43.9 |
22.8 |
800 |
|
3.95 |
235 |
247 |
61.4 |
99.0 |
21.7 |
41.4 |
70.3 |
42.9 |
21.5 |
785 |
|
4.00 |
229 |
241 |
60.8 |
98.2 |
20.5 |
40.5 |
69.7 |
41.9 |
20.1 |
765 |
|
4.05 |
223 |
234 |
|
97.3 |
(18.8) |
--- |
--- |
--- |
--- |
--- |
|
|
|
|
|
|
|
|
|
|
|
|
|
4.10 |
217 |
228 |
--- |
96.4 |
(17.5) |
--- |
--- |
--- |
--- |
725 |
|
4.15 |
212 |
222 |
--- |
95.5 |
(16.0) |
--- |
--- |
--- |
--- |
705 |
|
4.20 |
207 |
218 |
--- |
94.6 |
(15.2) |
--- |
--- |
--- |
--- |
690 |
|
4.25 |
201 |
212 |
--- |
93.8 |
(13.8) |
--- |
--- |
--- |
--- |
675 |
|
4.30 |
197 |
207 |
--- |
92.8 |
(12.7) |
--- |
--- |
--- |
--- |
655 |
|
|
|
|
|
|
|
|
|
|
|
|
|
4.35 |
192 |
202 |
--- |
91.9 |
(11.5) |
--- |
--- |
--- |
--- |
640 |
|
4.40 |
187 |
196 |
--- |
90.7 |
(10.0) |
--- |
--- |
--- |
--- |
620 |
|
4.45 |
183 |
192 |
--- |
90.0 |
(9.0) |
--- |
--- |
--- |
--- |
615 |
|
4.50 |
179 |
188 |
--- |
89.0 |
(8.0) |
--- |
--- |
--- |
--- |
600 |
|
4.55 |
174 |
182 |
--- |
87.8 |
(6.4) |
--- |
--- |
--- |
--- |
585 |
|
|
|
|
|
|
|
|
|
|
|
|
|
4.60 |
170 |
178 |
--- |
86.8 |
(5.4) |
--- |
--- |
--- |
--- |
570 |
|
4.65 |
167 |
175 |
--- |
86.0 |
(4.4) |
--- |
--- |
--- |
--- |
560 |
|
4.70 |
163 |
171 |
--- |
85.0 |
(3.3) |
--- |
--- |
--- |
--- |
545 |
|
4.80 |
156 |
163 |
--- |
82.9 |
(0.9) |
--- |
--- |
--- |
--- |
525 |
|
4.90 |
149 |
156 |
--- |
80.8 |
--- |
--- |
--- |
--- |
--- |
505 |
|
Brinell |
Brinell |
|
Rockwell Hardness |
Rockwell Superficial Hardness |
Approximate |
|
Indentation |
3000 kgf |
|
Rockwell A |
Rockwell B |
Rockwell C |
Rockwell D |
|
|
|
Tensile |
|
Diameter |
10 mm |
|
60 kgf |
100 kgf |
150 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Strength |
|
mm |
Ball |
Vickers |
Diamond |
1//16" ball |
Diamond |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
ksi (MPa) |
|
|
HB |
HV |
HRA |
HRB |
HRC |
HRD |
HR15N |
HR30N |
HR45N |
|
|
5.00 |
143 |
150 |
--- |
78.7 |
--- |
--- |
--- |
--- |
--- |
490 |
|
5.10 |
137 |
143 |
--- |
76.4 |
--- |
--- |
--- |
--- |
--- |
460 |
|
5.20 |
131 |
137 |
--- |
74.0 |
--- |
--- |
--- |
--- |
--- |
450 |
|
5.30 |
126 |
132 |
--- |
72.0 |
--- |
--- |
--- |
--- |
--- |
435 |
|
5.40 |
121 |
127 |
--- |
69.8 |
--- |
--- |
--- |
--- |
--- |
415 |
|
|
|
|
|
|
|
|
|
|
|
|
|
5.50 |
116 |
122 |
--- |
67.6 |
--- |
--- |
--- |
--- |
--- |
400 |
|
5.60 |
111 |
117 |
--- |
65.7 |
--- |
--- |
--- |
--- |
--- |
385 |
|
|
|
|
|
|
|
|
|
|
|
|
HARDNESS CONVERSION
TABLE (BASED ON HRC)
|
|
|
Brinell |
Rockwell Hardness |
Rockwell Superficial Hardness |
|
|
|
Rockwell C |
|
3000 kgf |
Rockwell A |
Rockwell B |
Rockwell D |
|
|
|
Approximate |
Rockwell C |
|
150 kgf |
Vickers |
10 mm |
60 kgf |
100 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Tensile |
150 kgf |
|
Diamond |
Hardness |
Ball |
Diamond |
1//16" ball |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
Strength |
Diamond |
|
HRC |
HV |
HB |
HRA |
HRB |
HRD |
HR15N |
HR30N |
HR45N |
ksi (MPa) |
HRC |
|
68 |
940 |
--- |
85.6 |
--- |
76.9 |
93.2 |
84.4 |
75.4 |
--- |
68 |
|
67 |
900 |
--- |
85.0 |
--- |
76.1 |
92.9 |
83.6 |
74.2 |
--- |
67 |
|
66 |
865 |
--- |
84.5 |
--- |
75.4 |
92.5 |
82.8 |
73.3 |
--- |
66 |
|
65 |
832 |
739 |
83.9 |
--- |
74.5 |
92.2 |
81.9 |
72.0 |
--- |
65 |
|
64 |
800 |
722 |
83.4 |
--- |
73.8 |
91.8 |
81.1 |
71.0 |
--- |
64 |
|
|
|
|
|
|
|
|
|
|
|
|
|
63 |
772 |
705 |
82.8 |
--- |
73.0 |
91.4 |
80.1 |
69.9 |
--- |
63 |
|
62 |
746 |
688 |
82.3 |
--- |
72.2 |
91.1 |
79.3 |
68.8 |
--- |
62 |
|
61 |
720 |
670 |
81.8 |
--- |
71.5 |
90.7 |
78.4 |
67.7 |
--- |
61 |
|
60 |
697 |
654 |
81.2 |
--- |
70.7 |
90.2 |
77.5 |
66.6 |
--- |
60 |
|
59 |
674 |
634 |
80.7 |
--- |
69.9 |
89.8 |
76.6 |
65.5 |
--- |
59 |
|
|
|
|
|
|
|
|
|
|
|
|
|
58 |
653 |
615 |
80.1 |
--- |
69.2 |
89.3 |
75.7 |
64.3 |
--- |
58 |
|
57 |
633 |
595 |
79.6 |
--- |
68.5 |
88.9 |
74.8 |
63.2 |
--- |
57 |
|
56 |
613 |
577 |
79.0 |
--- |
67.7 |
88.3 |
73.9 |
62.0 |
--- |
56 |
|
55 |
595 |
560 |
78.5 |
--- |
66.9 |
87.9 |
73.0 |
60.9 |
2075 |
55 |
|
54 |
577 |
543 |
78.0 |
--- |
66.1 |
87.4 |
72.0 |
59.8 |
2015 |
54 |
|
|
|
|
|
|
|
|
|
|
|
|
|
53 |
560 |
525 |
77.4 |
--- |
65.4 |
86.9 |
71.2 |
58.6 |
1950 |
53 |
|
52 |
544 |
512 |
76.8 |
--- |
64.6 |
86.4 |
70.2 |
57.4 |
1880 |
52 |
|
51 |
528 |
496 |
76.3 |
--- |
63.8 |
85.9 |
69.4 |
56.1 |
1820 |
51 |
|
50 |
513 |
481 |
75.9 |
--- |
63.1 |
85.5 |
68.5 |
55.0 |
1760 |
50 |
|
49 |
498 |
469 |
75.2 |
--- |
62.1 |
85.0 |
67.6 |
53.8 |
1695 |
49 |
|
|
|
Brinell |
Rockwell Hardness |
Rockwell Superficial Hardness |
|
|
|
Rockwell C |
|
3000 kgf |
Rockwell A |
Rockwell B |
Rockwell D |
|
|
|
Approximate |
Rockwell C |
|
150 kgf |
Vickers |
10 mm |
60 kgf |
100 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Tensile |
150 kgf |
|
Diamond |
Hardness |
Ball |
Diamond |
1//16" ball |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
Strength |
Diamond |
|
HRC |
HV |
HB |
HRA |
HRB |
HRD |
HR15N |
HR30N |
HR45N |
ksi (MPa) |
HRC |
|
48 |
484 |
455 |
74.7 |
--- |
61.4 |
84.5 |
66.7 |
52.5 |
1635 |
48 |
|
47 |
471 |
443 |
74.1 |
--- |
60.8 |
83.9 |
65.8 |
51.4 |
1580 |
47 |
|
46 |
458 |
432 |
73.6 |
--- |
60.0 |
83.5 |
64.8 |
50.3 |
1530 |
46 |
|
45 |
446 |
421 |
73.1 |
--- |
59.2 |
83.0 |
64.0 |
49.0 |
1480 |
45 |
|
44 |
434 |
409 |
72.5 |
--- |
58.5 |
82.5 |
63.1 |
47.8 |
1435 |
44 |
|
|
|
|
|
|
|
|
|
|
|
|
|
43 |
423 |
400 |
72.0 |
--- |
57.7 |
82.0 |
62.2 |
46.7 |
1385 |
43 |
|
42 |
412 |
390 |
71.5 |
--- |
56.9 |
81.5 |
61.3 |
45.5 |
1340 |
42 |
|
41 |
402 |
381 |
70.9 |
--- |
56.2 |
80.9 |
60.4 |
44.3 |
1295 |
41 |
|
40 |
392 |
371 |
70.4 |
--- |
55.4 |
80.4 |
59.5 |
43.1 |
1250 |
40 |
|
39 |
382 |
362 |
69.9 |
--- |
54.6 |
79.9 |
58.6 |
41.9 |
1215 |
39 |
|
|
|
|
|
|
|
|
|
|
|
|
|
38 |
372 |
353 |
69.4 |
--- |
53.8 |
79.4 |
57.7 |
40.8 |
1180 |
38 |
|
37 |
363 |
344 |
68.9 |
--- |
53.1 |
78.8 |
56.8 |
39.6 |
1160 |
37 |
|
36 |
354 |
336 |
68.4 |
(109.0) |
52.3 |
78.3 |
55.9 |
38.4 |
1115 |
36 |
|
35 |
345 |
327 |
67.9 |
(108.5) |
51,5 |
77.7 |
55.0 |
37.2 |
1080 |
35 |
|
34 |
336 |
319 |
67.4 |
(108.0) |
50.8 |
77.2 |
54.2 |
36.1 |
1055 |
34 |
|
|
|
|
|
|
|
|
|
|
|
|
|
33 |
327 |
311 |
66.8 |
(107.5) |
50.0 |
76.6 |
53.3 |
34.9 |
1025 |
33 |
|
32 |
318 |
301 |
66.3 |
(107.0) |
49.2 |
76.1 |
52.1 |
33.7 |
1000 |
32 |
|
31 |
310 |
294 |
65.8 |
(106.0) |
48.4 |
75.6 |
51.3 |
32.5 |
980 |
31 |
|
30 |
302 |
286 |
65.3 |
(105.5) |
47.7 |
75.0 |
50.4 |
31.3 |
950 |
30 |
|
29 |
294 |
279 |
64.7 |
(104.5) |
47.0 |
74.5 |
49.5 |
30.1 |
930 |
29 |
|
|
|
Brinell |
Rockwell Hardness |
Rockwell Superficial Hardness |
|
|
|
Rockwell C |
286 |
3000 kgf |
Rockwell A |
Rockwell B |
Rockwell D |
|
|
|
Approximate |
Rockwell C |
|
150 kgf |
Vicke279rs |
10 mm |
60 kgf |
100 kgf |
100 kgf |
15 kgf |
30 kgf |
45 kgf |
Tensile |
150 kgf |
|
Diamond |
Hardnes272s |
Ball |
Diamond |
1//16" ball |
Diamond |
1/16" ball |
1/16" ball |
1/16" ball |
Strength |
Diamond |
|
HRC |
HV |
HB |
HRA |
HRB |
HRD |
HR15N |
HR30N |
HR45N |
ksi (MPa) |
HRC |
|
28 |
286 |
271 |
64.3 |
(104.0) |
46.1 |
73.9 |
48.6 |
28.9 |
910 |
28 |
|
27 |
279 |
264 |
63.8 |
(103.0) |
45.2 |
73.3 |
47.7 |
27.8 |
880 |
27 |
|
26 |
272 |
258 |
63.3 |
(102.5) |
44.6 |
72.8 |
46.8 |
26.7 |
860 |
26 |
|
25 |
266 |
253 |
62.8 |
(101.5) |
43.8 |
72.2 |
45.9 |
25.5 |
840 |
25 |
|
24 |
260 |
247 |
62.4 |
(101.0) |
43.1 |
71.6 |
45.0 |
24.3 |
825 |
24 |
|
|
|
|
|
|
|
|
|
|
|
|
|
23 |
254 |
243 |
62.0 |
100.0 |
42.1 |
71.0 |
44.0 |
23.1 |
805 |
23 |
|
22 |
248 |
237 |
61.5 |
99.0 |
41.6 |
70.5 |
43.2 |
22.0 |
785 |
22 |
|
21 |
243 |
231 |
61.0 |
98.5 |
40.9 |
69.9 |
42.3 |
20.7 |
770 |
21 |
|
20 |
238 |
226 |
60.5 |
97.8 |
40.1 |
69.4 |
41.5 |
19.6 |
760 |
20 |
|
(18) |
230 |
219 |
--- |
96.7 |
--- |
--- |
--- |
--- |
730 |
(18) |
|
|
|
|
|
|
|
|
|
|
|
|
|
(16) |
222 |
212 |
--- |
95.5 |
--- |
--- |
--- |
--- |
705 |
(16) |
|
(14) |
213 |
203 |
--- |
93.9 |
--- |
--- |
--- |
--- |
675 |
(14) |
|
(12) |
204 |
194 |
--- |
92.3 |
--- |
--- |
--- |
--- |
650 |
(12) |
|
(10) |
196 |
187 |
--- |
90.7 |
--- |
--- |
--- |
--- |
620 |
(10) |
|
(8) |
188 |
179 |
--- |
89.5 |
--- |
--- |
--- |
--- |
600 |
(8) |
|
|
|
|
|
|
|
|
|
--- |
|
|
|
(6) |
180 |
171 |
--- |
87.1 |
--- |
--- |
--- |
--- |
580 |
(6) |
|
(4) |
173 |
165 |
--- |
85.5 |
--- |
--- |
--- |
--- |
550 |
(4) |
|
(2) |
166 |
158 |
--- |
83.5 |
--- |
--- |
--- |
--- |
530 |
(2) |
|
(0) |
160 |
152 |
--- |
81.7 |
--- |
--- |
--- |
--- |
510 |
(0) |
|
|
|
|
|
|
|
|
|
|
|
|
ASTM E 140 Hardness Conversion Tables for Metals
ASTM E140 Standard Hardness Conversion Tables for
Metals-Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness,
Knoop Hardness, Superficial Hardness, and Scleroscope Hardness
Approximate Hardness Conversion Numbers for Non-Austenitic Steels (Rockwell C
Hardness Range) A, B
|
Rockwell C
Hardness
Number
150 kgf
(HRC) |
Vickers
Hardness
Number
(HV) |
Brinell Hardness
Number C |
Knoop
Hardness,
Number
500-gf and
Over (HK) |
Rockwell Hardness Number |
Rockwell Superficial
Hardness Number |
Scleroscope
Hardness
Number D |
Rockwell C
Hardness
Number
150 kgf
(HRC) |
10-mm
Standard Ball,
3000-kgf
(HBS) |
10-mm
Carbide Ball,
3000-kgf
(HBW) |
A Scale,
60-kgf (HRA) |
D Scale,
100-kgf (HRD) |
15-N Scale,
15-kgf
(HR 15-N) |
30-N Scale,
30-kgf
(HR 30-N) |
45-N Scale,
45-kgf
(HR 45-N) |
|
68 |
940 |
--- |
--- |
920 |
85.6 |
76.9 |
93.2 |
84.4 |
75.4 |
97.3 |
68 |
|
67 |
900 |
--- |
--- |
895 |
85.0 |
76.1 |
92.9 |
83.6 |
74.2 |
95.0 |
67 |
|
66 |
865 |
--- |
--- |
870 |
84.5 |
75.4 |
92.5 |
82.8 |
73.3 |
92.7 |
66 |
|
65 |
832 |
--- |
(739) |
846 |
83.9 |
74.5 |
92.2 |
81.9 |
72.0 |
90.6 |
65 |
|
64 |
800 |
--- |
(722) |
822 |
83.4 |
73.8 |
91.8 |
81.1 |
71.0 |
88.5 |
64 |
|
63 |
772 |
--- |
(705) |
799 |
82.8 |
73.0 |
91.4 |
80.1 |
69.9 |
86.5 |
63 |
|
62 |
746 |
--- |
(688) |
776 |
82.3 |
72.2 |
91.1 |
79.3 |
68.8 |
84.5 |
62 |
|
61 |
720 |
--- |
(670) |
754 |
81.8 |
71.5 |
90.7 |
78.4 |
67.7 |
82.6 |
61 |
|
60 |
697 |
--- |
(654) |
732 |
81.2 |
70.7 |
90.2 |
77.5 |
66.6 |
80.8 |
60 |
|
59 |
674 |
--- |
634 |
710 |
80.7 |
69.9 |
89.8 |
76.6 |
65.5 |
79.0 |
59 |
|
58 |
653 |
--- |
615 |
690 |
80.1 |
69.2 |
89.3 |
75.7 |
64.3 |
77.3 |
58 |
|
57 |
633 |
--- |
595 |
670 |
79.6 |
68.5 |
88.9 |
74.8 |
63.2 |
75.6 |
57 |
|
56 |
613 |
--- |
577 |
650 |
79.0 |
67.7 |
88.3 |
73.9 |
62.0 |
74.0 |
56 |
|
55 |
595 |
--- |
560 |
630 |
78.5 |
66.9 |
87.9 |
73.0 |
60.9 |
72.4 |
55 |
|
54 |
577 |
--- |
543 |
612 |
78.0 |
66.1 |
87.4 |
72.0 |
59.8 |
70.9 |
54 |
|
53 |
560 |
--- |
525 |
594 |
77.4 |
65.4 |
86.9 |
71.2 |
58.6 |
69.4 |
53 |
|
52 |
544 |
(500) |
512 |
576 |
76.8 |
64.6 |
86.4 |
70.2 |
57.4 |
67.9 |
52 |
|
51 |
528 |
(487) |
496 |
558 |
76.3 |
63.8 |
85.9 |
69.4 |
56.1 |
66.5 |
51 |
|
50 |
513 |
(475) |
481 |
542 |
75.9 |
63.1 |
85.5 |
68.5 |
55.0 |
65.1 |
50 |
|
49 |
498 |
(464) |
469 |
526 |
75.2 |
62.1 |
85.0 |
67.6 |
53.8 |
63.7 |
49 |
|
48 |
484 |
451 |
455 |
510 |
74.7 |
61.4 |
84.5 |
66.7 |
52.5 |
62.4 |
48 |
|
47 |
471 |
442 |
443 |
495 |
74.1 |
60.8 |
83.9 |
65.8 |
51.4 |
61.1 |
47 |
|
46 |
458 |
432 |
432 |
480 |
73.6 |
60.0 |
83.5 |
64.8 |
50.3 |
59.8 |
46 |
Rockwell C
Hardness
Number
150 kgf
(HRC) |
Vickers
Hardness
Number
(HV) |
Brinell Hardness
Number C |
Knoop
Hardness,
Number
500-gf and
Over (HK) |
Rockwell Hardness Number |
Rockwell Superficial
Hardness Number |
Scleroscope
Hardness
Number D |
Rockwell C
Hardness
Number
150 kgf
(HRC) |
10-mm
Standard Ball,
3000-kgf
(HBS) |
10-mm
Carbide Ball,
3000-kgf
(HBW) |
A Scale,
60-kgf (HRA) |
D Scale,
100-kgf (HRD) |
15-N Scale,
15-kgf
(HR 15-N) |
30-N Scale,
30-kgf
(HR 30-N) |
45-N Scale,
45-kgf
(HR 45-N) |
|
45 |
446 |
421 |
421 |
466 |
73.1 |
59.2 |
83.0 |
64.0 |
49.0 |
58.5 |
45 |
|
44 |
434 |
409 |
409 |
452 |
72.5 |
58.5 |
82.5 |
63.1 |
47.8 |
57.3 |
44 |
|
43 |
423 |
400 |
400 |
438 |
72.0 |
57.7 |
82.0 |
62.2 |
46.7 |
56.1 |
43 |
|
42 |
412 |
390 |
390 |
426 |
71.5 |
56.9 |
81.5 |
61.3 |
45.5 |
54.9 |
42 |
|
41 |
402 |
381 |
381 |
414 |
70.9 |
56.2 |
80.9 |
60.4 |
44.3 |
53.7 |
41 |
|
40 |
392 |
371 |
371 |
402 |
70.4 |
55.4 |
80.4 |
59.5 |
43.1 |
52.6 |
40 |
|
39 |
382 |
362 |
362 |
391 |
69.9 |
54.6 |
79.9 |
58.6 |
41.9 |
51.5 |
39 |
|
38 |
372 |
353 |
353 |
380 |
69.4 |
53.8 |
79.4 |
57.7 |
40.8 |
50.4 |
38 |
|
37 |
363 |
344 |
344 |
370 |
68.9 |
53.1 |
78.8 |
56.8 |
39.6 |
49.3 |
37 |
|
36 |
354 |
336 |
336 |
360 |
68.4 |
52.3 |
78.3 |
55.9 |
38.4 |
48.2 |
36 |
|
35 |
345 |
327 |
327 |
351 |
67.9 |
51.5 |
77.7 |
55.0 |
37.2 |
47.1 |
35 |
|
34 |
336 |
319 |
319 |
342 |
67.4 |
50.8 |
77.2 |
54.2 |
36.1 |
46.1 |
34 |
|
33 |
327 |
311 |
311 |
334 |
66.8 |
50.0 |
76.6 |
53.3 |
34.9 |
45.1 |
33 |
|
32 |
318 |
301 |
301 |
326 |
66.3 |
49.2 |
76.1 |
52.1 |
33.7 |
44.1 |
32 |
|
31 |
310 |
294 |
294 |
318 |
65.8 |
48.4 |
75.6 |
51.3 |
32.5 |
43.1 |
31 |
|
30 |
302 |
286 |
286 |
311 |
65.3 |
47.7 |
75.0 |
50.4 |
31.3 |
42.2 |
30 |
|
29 |
294 |
279 |
279 |
304 |
64.8 |
47.0 |
74.5 |
49.5 |
30.1 |
41.3 |
29 |
|
28 |
286 |
271 |
271 |
297 |
64.3 |
46.1 |
73.9 |
48.6 |
28.9 |
40.4 |
28 |
|
27 |
279 |
264 |
264 |
290 |
63.8 |
45.2 |
73.3 |
47.7 |
27.8 |
39.5 |
27 |
|
26 |
272 |
258 |
258 |
284 |
63.3 |
44.6 |
72.8 |
46.8 |
26.7 |
38.7 |
26 |
|
25 |
266 |
253 |
253 |
278 |
62.8 |
43.8 |
72.2 |
45.9 |
25.5 |
37.8 |
25 |
|
24 |
260 |
247 |
247 |
272 |
62.4 |
43.1 |
71.6 |
45.0 |
24.3 |
37.0 |
24 |
|
23 |
254 |
243 |
243 |
266 |
62.0 |
42.1 |
71.0 |
44.0 |
23.1 |
36.3 |
23 |
|
22 |
248 |
237 |
237 |
261 |
61.5 |
41.6 |
70.5 |
43.2 |
22.0 |
35.5 |
22 |
|
21 |
243 |
231 |
231 |
256 |
61.0 |
40.9 |
69.9 |
42.3 |
20.7 |
34.8 |
21 |
|
20 |
238 |
226 |
226 |
251 |
60.5 |
40.1 |
69.4 |
41.5 |
19.6 |
34.2 |
20 |
|
A In the table headings,
force refers to total test forces.
B Appendix X1 contains equations converting determined hardness
scale numbers to Rockwell C hardness numbers for non-austenitic steels.
C The Brinell hardness numbers in parentheses are outside the
range recommended for Brinell hardness testing in 8.1 of Test Method E 10.
D These Scleroscope hardness conversions are based on Vickers—Scleroscope
hardness relationships developed from Vickers hardness data provided by the
National Bureau of Standards for 13 steel reference blocks, Scleroscope
hardness values obtained on these blocks by the Shore Instrument and Mfg.
Co., Inc., the Roll Manufacturers Institute, and members of this institute,
and also on hardness conversions previously published by the American
Society for Metals and the Roll Manufacturers Institute. |
Approximate Hardness Conversion Numbers for
Non-Austenitic Steels (Rockwell B Hardness Range) A, B
Rockwell B
Hardness
Number,
100-kgf
(HRB) |
Vickers
Hardness
Number
(HV) |
Brinell Hardness
Number,
3000-kgf,
(HBS) |
Knoop Hardness
Number,
500-gf, and
Over
(HK) |
Rockwell A
Hardness
Number,
60-kgf,
(HRA) |
Rockwell F
Hardness
Number,
60-kgf,
(HRF) |
Rockwell Superficial Hardness Number |
Rockwell B
Hardness
Number,
100-kgf,
(HRB) |
15-T Scale,
15-kgf,
(HR 15-T) |
30-T Scale,
30-kgf,
(HR 30-T) |
45-T Scale,
45-kgf,
(HR 45-T) |
|
100 |
240 |
240 |
251 |
61.5 |
--- |
93.1 |
83.1 |
72.9 |
100 |
|
99 |
234 |
234 |
246 |
60.9 |
--- |
92.8 |
82.5 |
71.9 |
99 |
|
98 |
228 |
228 |
241 |
60.2 |
--- |
92.5 |
81.8 |
70.9 |
98 |
|
97 |
222 |
222 |
236 |
59.5 |
--- |
92.1 |
81.1 |
69.9 |
97 |
|
96 |
216 |
216 |
231 |
58.9 |
--- |
91.8 |
80.4 |
68.9 |
96 |
|
95 |
210 |
210 |
226 |
58.3 |
--- |
91.5 |
79.8 |
67.9 |
95 |
|
94 |
205 |
205 |
221 |
57.6 |
--- |
91.2 |
79.1 |
66.9 |
94 |
|
93 |
200 |
200 |
216 |
57.0 |
--- |
90.8 |
78.4 |
65.9 |
93 |
|
92 |
195 |
195 |
211 |
56.4 |
--- |
90.5 |
77.8 |
64.8 |
92 |
|
91 |
190 |
190 |
206 |
55.8 |
--- |
90.2 |
77.1 |
63.8 |
91 |
|
90 |
185 |
185 |
201 |
55.2 |
--- |
89.9 |
76.4 |
62.8 |
90 |
|
89 |
180 |
180 |
196 |
54.6 |
--- |
89.5 |
75.8 |
61.8 |
89 |
|
88 |
176 |
176 |
192 |
54.0 |
--- |
89.2 |
75.1 |
60.8 |
88 |
|
87 |
172 |
172 |
188 |
53.4 |
--- |
88.9 |
74.4 |
59.8 |
87 |
|
86 |
169 |
169 |
184 |
52.8 |
--- |
88.6 |
73.8 |
58.8 |
86 |
|
85 |
165 |
165 |
180 |
52.3 |
--- |
88.2 |
73.1 |
57.8 |
85 |
|
84 |
162 |
162 |
176 |
51.7 |
--- |
87.9 |
72.4 |
56.8 |
84 |
|
83 |
159 |
159 |
173 |
51.1 |
--- |
87.6 |
71.8 |
55.8 |
83 |
|
82 |
156 |
156 |
170 |
50.6 |
--- |
87.3 |
71.1 |
54.8 |
82 |
|
81 |
153 |
153 |
167 |
50.0 |
--- |
86.9 |
70.4 |
53.8 |
81 |
|
80 |
150 |
150 |
164 |
49.5 |
--- |
86.6 |
69.7 |
52.8 |
80 |
|
79 |
147 |
147 |
161 |
48.9 |
--- |
86.3 |
69.1 |
51.8 |
79 |
Rockwell B
Hardness
Number,
100-kgf
(HRB) |
Vickers
Hardness
Number
(HV) |
Brinell Hardness
Number,
3000-kgf,
(HBS) |
Knoop Hardness
Number,
500-gf, and
Over
(HK) |
Rockwell A
Hardness
Number,
60-kgf,
(HRA) |
Rockwell F
Hardness
Number,
60-kgf,
(HRF) |
Rockwell
Superficial Hardness Number |
Rockwell B
Hardness
Number,
100-kgf,
(HRB) |
15-T Scale,
15-kgf,
(HR 15-T) |
30-T Scale,
30-kgf,
(HR 30-T) |
45-T Scale,
45-kgf,
(HR 45-T) |
|
78 |
144 |
144 |
158 |
48.4 |
--- |
86.0 |
68.4 |
50.8 |
78 |
|
77 |
141 |
141 |
155 |
47.9 |
--- |
85.6 |
67.7 |
49.8 |
77 |
|
76 |
139 |
139 |
152 |
47.3 |
--- |
85.3 |
67.1 |
48.8 |
76 |
|
75 |
137 |
137 |
150 |
46.8 |
99.6 |
85.0 |
66.4 |
47.8 |
75 |
|
74 |
135 |
135 |
147 |
46.3 |
99.1 |
84.7 |
65.7 |
46.8 |
74 |
|
73 |
132 |
132 |
145 |
45.8 |
98.5 |
84.3 |
65.1 |
45.8 |
73 |
|
72 |
130 |
130 |
143 |
45.3 |
98.0 |
84.0 |
64.4 |
44.8 |
72 |
|
71 |
127 |
127 |
141 |
44.8 |
97.4 |
83.7 |
63.7 |
43.8 |
71 |
|
70 |
125 |
125 |
139 |
44.3 |
96.8 |
83.4 |
63.1 |
42.8 |
70 |
|
69 |
123 |
123 |
137 |
43.8 |
96.2 |
83.0 |
62.4 |
41.8 |
69 |
|
68 |
121 |
121 |
135 |
43.3 |
95.6 |
82.7 |
61.7 |
40.8 |
68 |
|
67 |
119 |
119 |
133 |
42.8 |
95.1 |
82.4 |
61.0 |
39.8 |
67 |
|
66 |
117 |
117 |
131 |
42.3 |
94.5 |
82.1 |
60.4 |
38.7 |
66 |
|
65 |
116 |
116 |
129 |
41.8 |
93.9 |
81.8 |
59.7 |
37.7 |
65 |
|
64 |
114 |
114 |
127 |
41.4 |
93.4 |
81.4 |
59.0 |
36.7 |
64 |
|
63 |
112 |
112 |
125 |
40.9 |
92.8 |
81.1 |
58.4 |
35.7 |
63 |
|
62 |
110 |
110 |
124 |
40.4 |
92.2 |
80.8 |
57.7 |
34.7 |
62 |
|
61 |
108 |
108 |
122 |
40.0 |
91.7 |
80.5 |
57.0 |
33.7 |
61 |
|
60 |
107 |
107 |
120 |
39.5 |
91.1 |
80.1 |
56.4 |
32.7 |
60 |
|
59 |
106 |
106 |
118 |
39.0 |
90.5 |
79.8 |
55.7 |
31.7 |
59 |
|
58 |
104 |
104 |
117 |
38.6 |
90.0 |
79.5 |
55.0 |
30.7 |
58 |
|
57 |
103 |
103 |
115 |
38.1 |
89.4 |
79.2 |
54.4 |
29.7 |
57 |
|
56 |
101 |
101 |
114 |
37.7 |
88.8 |
78.8 |
53.7 |
28.7 |
56 |
|
55 |
100 |
100 |
112 |
37.2 |
88.2 |
78.5 |
53.0 |
27.7 |
55 |
|
54 |
--- |
--- |
111 |
36.8 |
87.7 |
78.2 |
52.4 |
26.7 |
54 |
Rockwell B
Hardness
Number,
100-kgf
(HRB) |
Vickers
Hardness
Number
(HV) |
Brinell Hardness
Number,
3000-kgf,
(HBS) |
Knoop Hardness
Number,
500-gf, and
Over
(HK) |
Rockwell A
Hardness
Number,
60-kgf,
(HRA) |
Rockwell F
Hardness
Number,
60-kgf,
(HRF) |
Rockwell Superficial Hardness Number |
Rockwell B
Hardness
Number,
100-kgf,
(HRB) |
15-T Scale,
15-kgf,
(HR 15-T) |
30-T Scale,
30-kgf,
(HR 30-T) |
45-T Scale,
45-kgf,
(HR 45-T) |
|
53 |
--- |
--- |
110 |
36.3 |
87.1 |
77.9 |
51.7 |
25.7 |
53 |
|
52 |
--- |
--- |
109 |
35.9 |
86.5 |
77.5 |
51.0 |
24.7 |
52 |
|
51 |
--- |
--- |
108 |
35.5 |
86.0 |
77.2 |
50.3 |
23.7 |
51 |
|
50 |
--- |
--- |
107 |
35.0 |
85.4 |
76.9 |
49.7 |
22.7 |
50 |
|
49 |
--- |
--- |
106 |
34.6 |
84.8 |
76.6 |
49.0 |
21.7 |
49 |
|
48 |
--- |
--- |
105 |
34.1 |
84.3 |
76.2 |
48.3 |
20.7 |
48 |
|
47 |
--- |
--- |
104 |
33.7 |
83.7 |
75.9 |
47.7 |
19.7 |
47 |
|
46 |
--- |
--- |
103 |
33.3 |
83.1 |
75.6 |
47.0 |
18.7 |
46 |
|
45 |
--- |
--- |
102 |
32.9 |
82.6 |
75.3 |
46.3 |
17.7 |
45 |
|
44 |
--- |
--- |
101 |
32.4 |
82.0 |
74.9 |
45.7 |
16.7 |
44 |
|
43 |
--- |
--- |
100 |
32.0 |
81.4 |
74.6 |
45.0 |
15.7 |
43 |
|
42 |
--- |
--- |
99 |
31.6 |
80.8 |
74.3 |
44.3 |
14.7 |
42 |
|
41 |
--- |
--- |
98 |
31.2 |
80.3 |
74.0 |
43.7 |
13.6 |
41 |
|
40 |
--- |
--- |
97 |
30.7 |
79.7 |
73.6 |
43.0 |
12.6 |
40 |
|
39 |
--- |
--- |
96 |
30.3 |
79.1 |
73.3 |
42.3 |
11.6 |
39 |
|
38 |
--- |
--- |
95 |
29.9 |
78.6 |
73.0 |
41.6 |
10.6 |
38 |
|
37 |
--- |
--- |
94 |
29.5 |
78.0 |
72.7 |
41.0 |
9.6 |
37 |
|
36 |
--- |
--- |
93 |
29.1 |
77.4 |
72.3 |
40.3 |
8.6 |
36 |
|
35 |
--- |
--- |
92 |
28.7 |
76.9 |
72.0 |
39.6 |
7.6 |
35 |
|
34 |
--- |
--- |
91 |
28.2 |
76.3 |
71.7 |
39.0 |
6.6 |
34 |
|
33 |
--- |
--- |
90 |
27.8 |
75.7 |
71.4 |
38.3 |
5.6 |
33 |
|
32 |
--- |
--- |
89 |
27.4 |
75.2 |
71.0 |
37.6 |
4.6 |
32 |
|
31 |
--- |
--- |
88 |
27.0 |
74.6 |
70.7 |
37.0 |
3.6 |
31 |
|
30 |
--- |
--- |
87 |
26.6 |
74.0 |
70.4 |
36.3 |
2.6 |
30 |
|
A In table headings, kgf
refers to total test force.
B Appendix X2 contains equations converting determined hardness
numbers to Rockwell B hardness numbers for non-austenitic steels. Refer to
1.11 before using conversion equations. |
Approximate Hardness
Conversion Numbers for
Non-Austenitic Steels (Rockwell C Hardness Range)
Rockwell Hardness Number,
B Scale (100-kgf, 1⁄16-in.
(1.588-mm) ball) (HRB) |
Brinell Hardness Number
(3000-kgf, 10-mm ball)
(HBS) |
| 100 |
256 |
| 99 |
248 |
| 98 |
240 |
| 97 |
233 |
| 96 |
226 |
| 95 |
219 |
| 94 |
213 |
| 93 |
207 |
| 92 |
202 |
| 91 |
197 |
| 90 |
192 |
| 89 |
187 |
| 88 |
183 |
| 87 |
178 |
| 86 |
174 |
| 85 |
170 |
| 84 |
167 |
| 83 |
163 |
| 82 |
160 |
| 81 |
156 |
| 80 |
153 |
| 79 |
150 |
| 78 |
147 |
| 77 |
144 |
| 76 |
142 |
| 75 |
139 |
| 74 |
137 |
| 73 |
135 |
| 72 |
132 |
| 71 |
130 |
| 70 |
128 |
| 69 |
126 |
| 68 |
124 |
| 67 |
122 |
| 66 |
120 |
| 65 |
118 |
| 64 |
116 |
| 63 |
114 |
| 62 |
113 |
| 61 |
111 |
| 60 |
110 |
|
Rockwell Hardness Number |
Rockwell Superficial Hardness Number |
C Scale, 150-kgf
Diamond
Penetrator
(HRC) |
A Scale, 60-kgf,
Diamond Penetrator
(HRA) |
15-N Scale, 15-kgf,
Superficial
Diamond Penetrator
(HR 15-N) |
30-N Scale, 30-kgf,
Superficial
Diamond Penetrator
(HR 30-N) |
45-N Scale, 45-kgf,
Superficial
Diamond Penetrator
(HR 45-N) |
| 48 |
74.4 |
84.1 |
66.2 |
52.1 |
| 47 |
73.9 |
83.6 |
65.3 |
50.9 |
| 46 |
73.4 |
83.1 |
64.5 |
49.8 |
| 45 |
72.9 |
82.6 |
63.6 |
48.7 |
| 44 |
72.4 |
82.1 |
62.7 |
47.5 |
| 43 |
71.9 |
81.6 |
61.8 |
46.4 |
| 42 |
71.4 |
81.0 |
61.0 |
45.2 |
| 41 |
70.9 |
80.5 |
60.1 |
44.1 |
| 40 |
70.4 |
80.0 |
59.2 |
43.0 |
| 39 |
69.9 |
79.5 |
58.4 |
41.8 |
| 38 |
69.3 |
79.0 |
57.5 |
40.7 |
| 37 |
68.8 |
78.5 |
56.6 |
39.6 |
| 36 |
68.3 |
78 |
55.7 |
38.4 |
| 35 |
67.8 |
77.5 |
54.9 |
37.3 |
| 34 |
67.3 |
77.0 |
54.0 |
36.1 |
| 33 |
66.8 |
76.5 |
53.1 |
35.0 |
| 32 |
66.3 |
75.9 |
52.3 |
33.9 |
| 31 |
65.8 |
75.4 |
51.4 |
32.7 |
| 30 |
65.3 |
74.9 |
50.5 |
31.6 |
| 29 |
64.8 |
74.4 |
49.6 |
30.4 |
| 28 |
64.3 |
73.9 |
48.8 |
29.3 |
| 27 |
63.8 |
73.4 |
47.9 |
28.2 |
| 26 |
63.3 |
72.9 |
47.0 |
27.0 |
| 25 |
62.8 |
72.4 |
46.2 |
25.9 |
| 24 |
62.3 |
71.9 |
45.3 |
24.8 |
| 23 |
61.8 |
71.3 |
44.4 |
23.6 |
| 22 |
61.3 |
70.8 |
43.5 |
22.5 |
| 21 |
60.8 |
70.3 |
42.7 |
21.3 |
| 20 |
60.3 |
69.8 |
41.8 |
20.2 |
| |
|
|
|
|
| B
Scale, 100-kgf, 1/16-in. (1.588-mm) Ball (HRB) |
A
Scale, 60-kgf, Diamond Penetrator (HRA) |
F
Scale, 60-kgf, 1/16-in. (1.588-mm) Ball C (HRF) |
15-T
Scale, 15-kgf, 1/16-in. (1.588-mm) Ball (HR 15-T) |
30-T
Scale, 30-kgf, 1/16-in. (1.588-mm) Ball (HR 30-T) |
45-T
Scale, 45-kgf, 1/16-in. (1.588-mm) Ball (HR 45-T) |
|
100 |
|
99 |
|
98 |
|
97 |
|
96 |
|
95 |
|
94 |
|
93 |
|
92 |
|
91 |
|
90 |
|
89 |
|
88 |
|
87 |
|
86 |
|
85 |
|
84 |
|
83 |
|
82 |
|
81 |
|
80 |
|
79 |
|
78 |
|
77 |
|
76 |
|
75 |
|
74 |
|
73 |
|
72 |
|
71 |
|
70 |
|
69 |
|
68 |
|
67 |
|
66 |
|
65 |
|
64 |
|
63 |
|
62 |
|
61 |
|
60 |
|
Standard deviation C |
|
|
61.5 |
|
60.9 |
|
60.3 |
|
59.7 |
|
59.1 |
|
58.5 |
|
58.0 |
|
57.4 |
|
56.8 |
|
56.2 |
|
55.6 |
|
55.0 |
|
54.5 |
|
53.9 |
|
53.3 |
|
52.7 |
|
52.1 |
|
51.5 |
|
50.9 |
|
50.4 |
|
49.8 |
|
49.2 |
|
48.6 |
|
48.0 |
|
47.4 |
|
46.9 |
|
46.3 |
|
45.7 |
|
45.1 |
|
44.5 |
|
43.9 |
|
43.3 |
|
42.8 |
|
42.2 |
|
41.6 |
|
41.0 |
|
40.4 |
|
39.8 |
|
39.3 |
|
38.7 |
|
38.1 |
|
1.44 |
|
|
(113.9) |
|
(113.2) |
|
(112.5) |
|
(111.8) |
|
(111.1) |
|
(110.5) |
|
(109.8) |
|
(109.1) |
|
(108.4) |
|
(107.8) |
|
(107.1) |
|
(106.4) |
|
(105.7) |
|
(105.0) |
|
(104.4) |
|
(103.7) |
|
(103.0) |
|
(102.3) |
|
(101.7) |
|
(101.0) |
|
(100.3) |
|
99.6 |
|
99.0 |
|
98.3 |
|
97.6 |
|
96.9 |
|
96.2 |
|
95.6 |
|
94.9 |
|
94.2 |
|
93.5 |
|
92.8 |
|
92.2 |
|
91.5 |
|
90.8 |
|
90.1 |
|
89.5 |
|
88.8 |
|
88.1 |
|
87.4 |
|
86.8 |
|
2.75 |
|
|
91.5 |
|
91.2 |
|
90.8 |
|
90.4 |
|
90.1 |
|
89.7 |
|
89.3 |
|
88.9 |
|
88.6 |
|
88.2 |
|
87.8 |
|
87.5 |
|
87.1 |
|
86.7 |
|
86.4 |
|
86.0 |
|
85.6 |
|
85.2 |
|
84.9 |
|
84.5 |
|
84.1 |
|
83.8 |
|
83.4 |
|
83.0 |
|
82.6 |
|
82.3 |
|
81.9 |
|
81.5 |
|
81.2 |
|
80.8 |
|
80.4 |
|
80.1 |
|
79.7 |
|
79.3 |
|
78.9 |
|
78.6 |
|
78.2 |
|
77.8 |
|
77.5 |
|
77.1 |
|
76.7 |
|
2.29 |
|
|
80.4 |
|
79.7 |
|
79.0 |
|
78.3 |
|
77.7 |
|
77.0 |
|
76.3 |
|
75.6 |
|
74.9 |
|
74.2 |
|
73.5 |
|
72.8 |
|
72.1 |
|
71.4 |
|
70.7 |
|
70.0 |
|
69.3 |
|
68.6 |
|
67.9 |
|
67.2 |
|
66.5 |
|
65.8 |
|
65.1 |
|
64.4 |
|
63.7 |
|
63.0 |
|
62.4 |
|
61.7 |
|
61.0 |
|
60.3 |
|
59.6 |
|
58.9 |
|
58.2 |
|
57.5 |
|
56.8 |
|
56.1 |
|
55.4 |
|
54.7 |
|
54.0 |
|
53.3 |
|
52.6 |
|
1.67 |
|
|
70.2 |
|
69.2 |
|
68.2 |
|
67.2 |
|
66.1 |
|
65.1 |
|
64.1 |
|
63.1 |
|
62.1 |
|
61.1 |
|
60.1 |
|
59.0 |
|
58.0 |
|
57.0 |
|
56.0 |
|
55.0 |
|
54.0 |
|
52.9 |
|
51.9 |
|
50.9 |
|
49.9 |
|
48.9 |
|
47.9 |
|
46.8 |
|
45.8 |
|
44.8 |
|
43.8 |
|
42.8 |
|
41.8 |
|
40.7 |
|
39.7 |
|
38.7 |
|
37.7 |
|
36.7 |
|
35.7 |
|
34.7 |
|
33.6 |
|
32.6 |
|
31.6 |
|
30.6 |
|
29.6 |
|
1.57 |
|
|
|
A In table headings, kgf or gf refers to
total test force.
B Appendix X6 contains equations converting determined
hardness numbers to Rockwell C and Rockwell B hardness numbers for
austenitic stainless steel sheet. Refer to 1.11 before using conversion
equations.
C Observed standard deviation of the inter-laboratory test
data about the indicated conversion line. |
|
|
|
The Ferrous Metals Data Book
|
|