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Steel (C Scale)

Approximate Hardness Conversion Numbers
for Non-Austenitic Steels

Rockwell Hardness Number C Scale, 150 Kgf (HRC) Vicker’s Hardness Number (HV) Brinell Hardness No. 10mm Standard Ball, 3000 Kgf (HBS) Brinell Hardness No. 10mm Carbide Ball, 3000 Kgf (HBW) Knoop Hardness Number 500 gf & Over (HK)
68 940 920
67 900 895
66 865 870
65 832 846
64 800 822
63 772 799
62 746 776
61 720 754
60 697 732
59 674 634 710
58 653 615 690
57 633 595 670
56 613 577 650
55 595 560 630
54 577 543 612
53 560 525 594
52 544 512 576
51 528 496 558
50 513 481 542
49 498 469 526
48 484 451 455 510
47 471 442 443 495
46 458 432 432 480
45 446 421 421 466
44 434 409 409 452
43 423 400 400 438
42 412 390 390 426
41 402 381 381 414
40 392 371 371 402
39 382 362 362 391
38 372 353 353 380
37 363 344 344 370
36 354 336

336 360
35 345 327 327 351
34 336 319 319 342
33 327 311 311 334
32 318 301 301 326
31 310 294 294 318
30 302 286 286 311
29 294 279 279 304
28 286 271 271 297
27 279 264 264 290
26 272 258 258 284
25 266 253 253 278
24 260 247 247 272
23 254 243 243 266
22 248 237 237 261
21 243 231 231 256
20 238 226 226 251
Rockwell Hardness Number A Scale, 60 Kgf (HRA) Rockwell Hardness Number D Scale, 100 Kgf (HRD) Rockwell Superficial Hardness No. 15N Scale, 15 Kgf (15N) Rockwell Superficial Hardness No. 30N Scale, 30 Kgf (30N) Rockwell Superficial Hardness No. 45N Scale, 45 Kgf (45N)
85.6 76.9 93.2 84.4 75.4
85 76.1 92.9 83.6 74.2
84.5 75.4 92.5 82.8 73.3
83.9 74.5 92.2 81.9 72
83.4 73.8 91.8 81.1 71
82.8 73 91.4 80.1 69.9
82.3 72.2 91.1 79.3 68.8
81.8 71.5 90.7 78.4 67.7
81.2 70.7 90.2 77.5 66.6
80.7 69.9 89.8 76.6 65.5
80.1 69.2 89.3 75.7 64.3
79.6 68.5 88.9 74.8 63.2
79 67.7 88.3 73.9 62
78.5 66.9 87.9 73 60.9
78 66.1 87.4 72 59.8
77.4 65.4 86.9 71.2 58.6
76.8 64.6 86.4 70.2 57.4
76.3 63.8 85.9 69.4 56.1
75.9 63.1 85.5 68.5 55
75.2 62.1 85 67.6 53.8
74.7 61.4 84.5 66.7 52.5
74.1 60.8 83.9 65.8 51.4
73.6 60 83.5 64.8 50.3
73.1 59.2 83 64 49
72.5 58.5 82.5 63.1 47.8
72 57.7 82 62.2 46.7
71.5 56.9 81.5 61.3 45.5
70.9 56.2 80.9 60.4 44.3
70.4 55.4 80.4 59.5 43.1
69.9 54.6 79.9 58.6 41.9
69.4 53.8 79.4 57.7 40.8
68.9 53.1 78.8 56.8 39.6
68.4 52.3 78.3 55.9 38.4
67.9 51.5 77.7 55 37.2
67.4 50.8 77.2 54.2 36.1
66.8 50 76.6 53.3 34.9
66.3 49.2 76.1 52.1 33.7
65.8 48.4 75.6 51.3 32.5
65.3 47.7 75 50.4 31.3
64.8 47 74.5 49.5 30.1
64.3 46.1 73.9 48.6 28.9
63.8 45.2 73.3 47.7 27.8
63.3 44.6 72.8 46.8 26.7
62.8 43.8 72.2 45.9 25.5
62.4 43.1 71.6 45 24.3
62 42.1 71 44 23.1
61.5 41.6 70.5 43.2 22
61 40.9 69.9 42.3 20.7
60.5 40.1 69.4 41.5 19.6