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Comparative Hardness Scales for Steel per Machinery's Handbook (25th Edition, pgs 526-527)

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The table below shows comparisons of various hardness scales. The information contained in the table is based on the assumption that the metal tested is homogeneous to a depth several times that of the indentation. The data shown in Data Set 1 is based upon extensive tests on carbon and alloy steels mostly in the heat-treated condition and is generally reliable on constructional alloy steel and tool steels in the as-forged, annealed, normalized, quenched and tempered conditions. These hardness comparisons are not as accurate in special cases such as high manganese steel, 18-8 stainless steel, and other austenitic steels, and nickel based alloys. The data shown in Data Set 2 are based upon the hardness measurements of unhardened steel, steel of soft temper, grey and malleable cast iron, and most non-ferrous metals and may not be as accurate for annealed metals of high Rockwell B hardness such as austenitic stainless steel, nickel, high nickel alloys, and aluminum.

Brinell Hardness Number, 10mm Ball, 3000-kgf Load Rockwell Hardness Number Rockwell Superficial Hardness Number Superficial Diameter Penetrator
Rockwell C-Scale Hardness Number Diamond Pyramid Hardness Number Vickers Standard Ball Hultgren Ball Tungsten Carbide Ball A-Scale 60-kgf Load Diameter Penetrator D-Scale 100-kgf Load Diameter Penetrator 15-N Scale 15-kgf Load 30-N Scale 30-kgf Load 45-N Scale 45-kgf Load Shore Scleroscope Hardness Number
Data Set 1 68 940 - - - 85.6 76.9 93.2 84.4 75.4 97
67 900 - - - 85.0 76.1 92.9 83.6 74.2 95
66 865 - - - 84.5 75.4 92.5 82.8 73.3 92
65 832 - - 739 83.9 74.5 92.2 81.9 72.0 91
64 800 - - 722 83.4 73.8 91.8 81.1 71.0 88
63 772 - - 705 82.8 73.0 91.4 80.1 69.9 87
62 746 - - 688 82.3 72.2 91.1 79.3 68.8 85
61 720 - - 670 81.8 71.5 90.7 78.4 67.7 83
60 697 - 613 654 81.2 70.7 90.2 77.5 66.6 81
59 674 - 599 634 80.7 69.9 89.8 76.6 65.5 80
58 653 - 587 615 80.1 69.2 89.3 75.7 64.3 78
57 633 - 575 595 79.6 68.5 88.9 74.8 63.2 76
56 613 - 561 577 79.0 67.7 88.3 73.9 62.0 75
55 595 - 546 560 78.5 66.9 87.9 73.0 60.9 74
54 577 - 534 543 78.0 66.1 87.4 72.0 59.8 72
53 560 - 519 525 77.4 65.4 86.9 71.2 58.6 71
52 544 500 508 512 76.8 64.6 86.4 70.2 57.4 69
51 528 487 494 496 76.3 63.8 85.9 69.4 56.1 68
50 513 475 481 481 75.9 63.1 85.5 68.5 55.0 67
49 498 464 469 469 75.2 62.1 85.0 67.6 53.8 66
48 484 451 455 455 74.7 61.4 84.5 66.7 52.5 64
47 471 442 443 443 74.1 60.8 83.9 65.8 51.4 63
46 458 432 432 432 73.6 60.0 83.5 64.8 50.3 62
45 446 421 421 421 73.1 59.2 83.0 64.0 49.0 60
44 434 409 409 409 72.5 58.5 82.5 63.1 47.8 58
43 423 400 400 400 72.0 57.7 82.0 62.2 46.7 57
42 412 390 390 390 71.5 56.9 81.5 61.3 45.5 56
41 402 381 381 381 70.9 56.2 80.9 60.4 44.3 55
40 392 371 371 371 70.4 55.4 80.4 59.5 43.1 54
39 382 362 362 362 69.9 54.6 79.9 58.6 41.9 52
38 372 353 353 353 69.4 53.8 79.4 57.7 40.8 51
37 363 344 344 344 68.9 53.1 78.8 56.8 39.6 50
36 354 336 336 336 68.4 52.3 78.3 55.9 38.4 49
35 345 327 327 327 67.9 51.5 77.7 55.0 37.2 48
34 336 319 319 319 67.4 50.8 77.2 54.2 36.1 47
33 327 311 311 311 66.8 50.0 76.6 53.3 34.9 46
32 318 301 301 301 66.3 49.2 76.1 52.1 33.7 44
31 310 294 294 294 65.8 48.4 75.6 51.3 32.5 43
30 302 286 286 286 65.3 47.7 75.0 50.4 31.3 42
29 294 279 279 279 64.7 47.0 74.5 49.5 30.1 41
28 286 271 271 271 64.3 46.1 73.9 48.6 28.9 41
27 279 264 264 264 63.8 45.2 73.3 47.7 27.8 40
Data Set 2 26 272 258 258 258 63.3 44.6 72.8 46.8 26.7 38
25 266 253 253 253 62.8 43.8 72.2 45.9 25.5 38
24 260 247 247 247 62.4 43.1 71.6 45.0 24.3 37
23 254 243 243 243 62.0 42.1 71.0 44.0 23.1 36
22 248 237 237 237 61.5 41.6 70.5 43.2 22.0 35
21 243 231 231 231 61.0 40.9 69.9 42.3 20.7 35
20 238 226 226 226 60.5 40.1 69.4 41.5 19.6 34
(18) 230 219 219 219 - - - - - 33
(16) 222 212 212 212 - - - - - 32
(14) 213 203 203 203 - - - - - 31
(12) 204 194 194 194 - - - - - 29
(10) 196 187 187 187 - - - - - 28
(8) 188 179 179 179 - - - - - 27
(6) 180 171 171 171 - - - - - 26
(4) 173 165 165 165 - - - - - 25
(2) 166 158 158 158 - - - - - 24
(0) 160 152 152 152 - - - - - 24
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