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Rockwell Hardness (HRC, HRB) to Brinell Hardness (HB or BHN) Conversion

Hardness is very important for producing rough metal castings, heat treatment and machining process. Rockwell Hardness (HRC and HRB) and Brinell Hardness (HB or BHN) are most commonly used for steel and iron castings.

Although there is no accurate conversion tables and equations, but we can recommend the following formulas and comparison tables according to the experience and standards.

Formula A - Convert HRC into HB

Rockwell C Hardness (HRC) Brinell Hardness (HB)
From 21 to 30 HB = 5.970 * HRC + 104.7
From 31 to 40 HB = 8.570 * HRC + 27.6
From 41 to 50 HB = 11.158 * HRC + 79.6
From 51 to 60 HB = 17.515 * HRC - 401

Formula B - Convert HRB into HB

Rockwell B Hardness (HRB) Brinell Hardness (HB)
From 55 to 69 HB = 1.646 * HRB + 8.7
From 70 to 79 HB = 2.394 * HRB - 42.7
From 80 to 89 HB = 3.297 * HRB - 114
From 90 to 100 HB = 5.582 * HRB - 319

The following two conversion tables come from standard ASTM A 370. Table A is the comparison between Rockwell C Hardness, Brinell Hardness, Vickers Hardness and tensile strength (Rm). Table B is the comparison between HRB, BH, HV and Rm.

Table A - HRC to HB, HV, Rm

HRC Hardness HB Hardness HV Hardness Rm Tensile Strength
Diamond penetrator Brinell 3000 Kgf Vickers 30 N / mm2 MPa
20 226 238 760
21 231 243 770
22 237 248 790
23 243 254 810
24 247 260 820
25 253 266 850
26 258 272 860
27 264 279 880
28 271 286 900
29 279 294 930
30 286 302 950
31 294 310 970
32 301 318 1010
33 311 327 1030
34 319 336 1050
35 327 345 1080
36 336 354 1110
37 344 363 1140
38 353 372 1180
39 362 382 1220
40 371 392 1250
41 381 402 1300
42 390 412 1340
43 400 423 1390
44 409 434 1430
45 421 446 1480
46 432 458 1520
47 442 471 1580
48 455 484 1640
49 468 498 1700
50 482 513 1760
51 496 528 1820
52 512 544 1880
53 525 560 1950
54 543 577 2010
55 560 595 2070
56 577 613 2160
57 595 633 2240
58 615 653 2330
59 634 674 2420
60 654 697  -
61 670 720  -
62 688 746  -
63 706 772  -
64 722 800  - 
65 739 832  -
66  - 865  -
67  - 900  -
68  - 940  -

Table B - HRB to HB, HV, Rm

HRB Hardness HB Hardness HV Hardness Rm Tensile Strength
Ball 1 / 16 " Brinell 3000 Kgf Vickers 30 N / mm2 MPa
49 92  - 320
51 94  - 330
54  -  -  -
55 100 100 340
56 101 101  -
57 103 103 350
58 104 104  -
59 106 106 360
60 107 107  -
61 108 108  -
62 110 110 370
63 112 112  -
64 114 114  -
65 116 116 385
66 117 117 395
67 119 119 400
68 121 121 405
69 123 123 415
70 125 125 420
71 127 127 425
72 130 130 435
73 132 132 440
74 135 135 450
75 137 137 455
76 139 139 460
77 141 141 470
78 144 144 475
79 147 147 485
80 150 150 495
81 153 153 505
82 156 156 530
83 159 159 550
84 162 162 560
85 165 165 565
86 169 169 570
87 172 172 580
88 176 176 590
89 180 180 605
90 185 185 615
91 190 190 620
92 195 195 635
93 200 200 650
94 205 205 675
95 210 210 690
96 216 216 705
97 222 222 715
98 228 228 750
99 234 234 785
100 240 240 800

HRC - diamond penetrator 120°, load 1470 N (150 kgf) duration 30 seconds.
HRB - ball 1/16’’, load 980 N (100 kgf) duration 30 seconds.
HB - ball 10 mm, load 29,400N (3000 kgf) durata 15 seconds.
BHN - Brinell Hardness Number, which is the same meaning as HB.
HV - diamond penetrator 136°, load 294 N (30 kgf) duration 15 seconds.

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