Da Rockwell B a tutte le altre scale sia che per acciai che per leghe leggere.
Scale di trasformazione da :
Rockwell B, Rockwell A, Rockwell F, Super Rockwell HR 15T HR 30T HR 45T
Prove di durezza, metodo, #Rockwell, #Brinell, #Vickers, #Knoop, #Shore, #Leeb, #UCI. secondo ISO e ASTM ISO 18625. #Conversioni #Riparazione #Revisione #Tarature.durometri. Diamanti Rockwell Vickes.
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. |
Tabella 1A ISO 18256:2003 Rer acciai non legati, Basso legati, e ghisa acciaiosa.
|
|||||||||
MPa | HV 10 | HB | HRB | HRC | HRA | HRD | HR15N | HR30N | HRN45N |
255
|
80
|
76,2
|
< | ||||||
270
|
85
|
80,7
|
41,0
|
||||||
285
|
90
|
85,5
|
48,0
|
||||||
305
|
95
|
90,2
|
52,0
|
||||||
320
|
100
|
95,0
|
56,2
|
||||||
325
|
105
|
99,8
|
|||||||
350
|
110
|
105
|
62,0
|
||||||
370
|
115
|
109
|
|||||||
385
|
120
|
114
|
|||||||
400
|
125
|
119
|
68,0
|
||||||
400
|
130
|
124
|
71,2
|
||||||
432
|
135
|
128
|
|||||||
448
|
140
|
133
|
75,0
|
||||||
464
|
145
|
138
|
|||||||
480
|
150
|
143
|
78,7
|
||||||
496
|
155
|
147
|
|||||||
512
|
160
|
152
|
81,1
|
||||||
528
|
165
|
156
|
|||||||
544
|
170
|
162
|
84,2
|
||||||
560
|
175
|
166
|
|||||||
576
|
180
|
171
|
87,1
|
||||||
592
|
185
|
176
|
|||||||
608
|
190
|
181
|
89,5
|
||||||
624
|
195
|
185
|
|||||||
640
|
200
|
190
|
91,5
|
||||||
656
|
205
|
195
|
92,5
|
||||||
672
|
210
|
199
|
93,5
|
||||||
688
|
215
|
204
|
94,0
|
||||||
704
|
220
|
209
|
95,0
|
||||||
720
|
225
|
214
|
96,0
|
||||||
736
|
230
|
219
|
96,7
|
||||||
752
|
235
|
223
|
HRC
|
HRA
|
HRD
|
HR15N
|
HR30N
|
HRN45N
|
|
768
|
240
|
228
|
98,1
|
20,3
|
60,7
|
40,3
|
69,6
|
41,7
|
19,9
|
784
|
245
|
233
|
21,3
|
61,2
|
41,1
|
70,1
|
42,5
|
21,1
|
|
800
|
250
|
238
|
99,5
|
22,2
|
61,6
|
41,7
|
70,6
|
43,2
|
22,2
|
816
|
255
|
242
|
23,1
|
62,0
|
42,2
|
71,1
|
44,2
|
23,2
|
|
832
|
260
|
247
|
101,0
|
24,0
|
62,4
|
43,1
|
71,6
|
45
|
24,3
|
848
|
265
|
252
|
24,8
|
62,7
|
43,7
|
72,1
|
45,7
|
25,2
|
|
864
|
270
|
257
|
102,0
|
25,6
|
63,1
|
44,3
|
72,6
|
46,4
|
26,2
|
880
|
275
|
261
|
26,4
|
63,5
|
44,9
|
73,0
|
47,2
|
27,1
|
|
896
|
280
|
266
|
104,0
|
27,1
|
63,8
|
45,3
|
73,4
|
47,8
|
27,9
|
912
|
285
|
271
|
27,8
|
64,2
|
46,0
|
73,8
|
48,4
|
28,7
|
|
928
|
290
|
276
|
105,0
|
28,5
|
64,5
|
46,5
|
74,2
|
49
|
29,5
|
944
|
295
|
280
|
29,2
|
64,8
|
47,1
|
74,6
|
49,7
|
30,4
|
|
960
|
300
|
285
|
29,8
|
65,2
|
47,5
|
74,9
|
50,2
|
31,1
|
|
992
|
310
|
295
|
31,0
|
65,8
|
48,4
|
75,6
|
51,3
|
32,5
|
|
1024
|
320
|
304
|
32,2
|
66,4
|
49,4
|
76,2
|
52,3
|
33,9
|
|
1056
|
330
|
314
|
33,3
|
67,0
|
50,2
|
76,8
|
53,6
|
35,2
|
|
1088
|
340
|
323
|
34,4
|
67,6
|
51,1
|
77,4
|
54,4
|
36,5
|
|
1120
|
350
|
333
|
35,5
|
68,1
|
51,9
|
78,0
|
55,4
|
37,8
|
|
1152
|
360
|
342
|
36,6
|
68,8
|
52,8
|
78,6
|
56,4
|
39,1
|
|
1184
|
370
|
352
|
37,7
|
69,2
|
53,6
|
79,2
|
57,4
|
40,4
|
|
1216
|
380
|
361
|
38,8
|
69,8
|
54,4
|
79,8
|
58,4
|
41,7
|
|
1248
|
390
|
371
|
39,8
|
70,3
|
55,3
|
80,3
|
59,3
|
42,9
|
|
1280
|
400
|
380
|
40,8
|
70,8
|
56,0
|
80,8
|
60,2
|
44,1
|
|
1312
|
410
|
390
|
41,8
|
71,4
|
56,8
|
81,4
|
61,1
|
45,3
|
|
1344
|
420
|
399
|
42,7
|
71,8
|
57,5
|
81,8
|
61,9
|
46,4
|
|
1376
|
430
|
409
|
43,6
|
72,3
|
58,2
|
82,3
|
62,7
|
47,4
|
|
1408
|
440
|
418
|
44,5
|
72,8
|
58,8
|
82,8
|
63,5
|
48,4
|
|
1440
|
450
|
428
|
45,3
|
73,3
|
59,4
|
83,2
|
64,3
|
49,4
|
|
1472
|
460
|
437
|
46,1
|
73,6
|
60,1
|
83,6
|
64,9
|
50,4
|
|
1504
|
470
|
447
|
46,9
|
74,1
|
60,7
|
83,9
|
65,7
|
51,3
|
|
1536
|
480
|
456
|
47,7
|
74,5
|
61,3
|
84,3
|
66,4
|
52,2
|
|
1568
|
490
|
466
|
48,4
|
74,9
|
61,6
|
84,7
|
67,1
|
53,1
|
|
1600
|
500
|
475
|
49,1
|
75,3
|
62,2
|
85,0
|
67,7
|
53,9
|
|
1632
|
510
|
485
|
49,8
|
75,7
|
62,9
|
85,4
|
68,3
|
54,7
|
|
1664
|
520
|
494
|
50,5
|
76,1
|
63,5
|
85,7
|
69
|
55,6
|
|
1696
|
530
|
504
|
51,1
|
76,4
|
63,9
|
86,0
|
69,5
|
56,2
|
|
1728
|
540
|
513
|
51,7
|
76,7
|
64,4
|
86,3
|
70
|
57
|
|
1760
|
550
|
523
|
52,3
|
77,0
|
64,8
|
86,6
|
70,5
|
57,8
|
|
1792
|
560
|
532
|
53,0
|
77,4
|
65,4
|
86,9
|
71,2
|
58,6
|
|
1824
|
570
|
542
|
53,6
|
77,8
|
65,8
|
87,2
|
71,7
|
59,3
|
|
1856
|
580
|
551
|
54,1
|
78,0
|
66,2
|
87,5
|
72,1
|
59,9
|
|
1888
|
590
|
560
|
54,7
|
78,4
|
66,7
|
87,8
|
72,7
|
60,5
|
|
1920
|
600
|
570
|
55,2
|
78,6
|
67,0
|
88,0
|
73,2
|
61,2
|
|
1952
|
610
|
58
|
55,7
|
78,9
|
67,5
|
88,2
|
73,7
|
61,7
|
|
1984
|
620
|
589
|
56,3
|
79,2
|
67,9
|
88,5
|
74,2
|
62,4
|
|
2016
|
630
|
599
|
56,8
|
79,5
|
68,3
|
88,8
|
74,6
|
63
|
|
2048
|
640
|
608
|
57,3
|
79,8
|
68,7
|
89,0
|
75,1
|
63,5
|
|
2080
|
650
|
618
|
57,8
|
80,0
|
69,0
|
89,2
|
75,5
|
64,1
|
|
2112
|
660
|
58,3
|
80,3
|
69,4
|
89,5
|
75,9
|
64,7
|
||
2144
|
670
|
58,8
|
80,6
|
69,8
|
89,7
|
76,4
|
65,3
|
||
2176
|
680
|
59,2
|
80,8
|
70,1
|
89,8
|
76,8
|
65,7
|
||
2208
|
690
|
59,7
|
81,1
|
70,5
|
90,1
|
77,2
|
66,2
|
||
2240
|
700
|
60,1
|
81,3
|
70,8
|
90,3
|
77,6
|
66,7
|
||
2304
|
720
|
61,0
|
81,8
|
71,5
|
90,7
|
78,4
|
67,7
|
||
2368
|
740
|
61,8
|
82,2
|
72,1
|
91,0
|
79,1
|
68,6
|
||
2432
|
760
|
62,5
|
82,6
|
72,6
|
91,2
|
79,7
|
69,4
|
||
2496
|
780
|
63,3
|
83,0
|
73,3
|
91,5
|
80,4
|
70,2
|
||
2560
|
800
|
64,0
|
83,4
|
73,8
|
91,8
|
81,1
|
71
|
||
2624
|
820
|
64,7
|
83,8
|
74,3
|
92,1
|
81,7
|
71,8
|
||
2688
|
840
|
65,3
|
84,1
|
74,8
|
92,3
|
82,2
|
72,2
|
||
2752
|
860
|
65,9
|
84,4
|
75,3
|
92,5
|
82,7
|
73,1
|
||
2816
|
880
|
66,4
|
84,7
|
75,7
|
92,7
|
83,1
|
73,6
|
||
2880
|
900
|
67,0
|
85,0
|
76,1
|
92,9
|
83,6
|
74,2
|
||
2944
|
920
|
67,5
|
85,3
|
76,5
|
93,0
|
84
|
74,8
|
||
3008
|
940
|
68,0
|
85,5
|
76,9
|
93,2
|
84,4
|
75,4
|
Credevamo che non fosse possibile invece lo abbiamo migliorato ancora. Siamo alla versione 4.1 Certificata per ISO 27025 capodieci.i...