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Hardness conversion on Cold RickImages and videos used on the Cold Rick site are to the best of our knowledge public domain. Anything found to be breaching copyright will be removed immediately. Articles on the Cold Rick site remain the property of the writer/submitter and the opinions stated in these articles are not necessarily the opinions of the Cold Rick site or its editors.Hardness is the property that enables something to resist deformation. Hardness testing is based on experiments and observation. There are several methods of testing hardness including Brinell, Rockwell and Vickers which all use an indentation test. There are other hardness testing methods not discussed in this document. Rockwell HardnessThe Rockwell C hardness test is performed by pressing a cone-shaped test piece into the boundary layer of material with a defined pressure. The remaining impression depth is measured. For the Rockwell B procedure a steel ball is used instead of a cone. Vickers Hardness (HV)The Vickers test presses the point of a pyramid of diamond into the surface of the working piece for 10-30 seconds with a defined pressure. The diagonal of the resulting imprint of the pyramid is measured. Brinell Hardness (HBW)The Brinell hardness test is performed by pressing a tungsten carbide ball into the material surface for more than 10 seconds with a defined pressure. The Brinell hardness is determined from the diameter of the impression. Continued below... |
There is no exact formula for converting the results of one type of hardness test to another, however the table below gives a nearest approximation based on test results.
Hardness Scales |
Tensile Stress Equivalents |
|||||
Rockwell C
|
Vickers
|
Brinell
|
Tons/in2 |
1000lb/in2 |
kg/mm2 |
MPa |
| 67.7 | 900 | |||||
| 67.0 | 880 | |||||
| 66.3 | 860 | |||||
| 65.5 | 840 | |||||
| 64.8 | 820 | |||||
| 64.0 | 800 | |||||
| 63.3 | 780 | |||||
| 62.5 | 760 | |||||
| 61.7 | 740 | |||||
| 61.0 | 725 | 630 | ||||
| 60.5 | 710 | 627 | ||||
| 60.0 | 698 | 601 | 132 | 295 | 208 | 2039 |
| 58.9 | 670 | 578 | 127 | 284 | 200 | 1961 |
| 57.1 | 630 | 555 | 122 | 273 | 192 | 1884 |
| 56.1 | 609 | 534 | 117 | 262 | 184 | 1807 |
| 54.4 | 572 | 514 | 112 | 250 | 176 | 1729 |
| 51.9 | 532 | 495 | 108 | 241 | 170 | 1668 |
| 50.7 | 517 | 477 | 105 | 235 | 165 | 1621 |
| 49.5 | 497 | 461 | 101 | 226 | 160 | 1559 |
| 47.5 | 470 | 444 | 98 | 219 | 155 | 1513 |
| 46.0 | 452 | 429 | 95 | 212 | 150 | 1467 |
| 44.8 | 437 | 415 | 92 | 206 | 145 | 1420 |
| 43.7 | 422 | 401 | 88 | 197 | 139 | 1359 |
| 42.4 | 408 | 388 | 85 | 190 | 134 | 1312 |
| 41.3 | 395 | 375 | 82 | 183 | 129 | 1266 |
| 39.9 | 381 | 363 | 80 | 179 | 126 | 1235 |
| 38.8 | 370 | 352 | 77 | 172 | 121 | 1189 |
| 37.7 | 359 | 341 | 75 | 168 | 118 | 1158 |
| 36.7 | 349 | 331 | 73 | 163 | 114 | 1127 |
| 35.0 | 337 | 321 | 71 | 159 | 111 | 1096 |
| 34.0 | 327 | 311 | 68 | 152 | 107 | 1050 |
| 33.0 | 318 | 302 | 66 | 147 | 104 | 1019 |
| 32.0 | 308 | 293 | 64 | 143 | 101 | 988 |
| 30.9 | 300 | 285 | 63 | 141 | 99 | 973 |
| 29.8 | 292 | 277 | 61 | 136 | 96 | 942 |
| 29.0 | 284 | 269 | 59 | 132 | 93 | 911 |
| 27.5 | 275 | 262 | 58 | 130 | 91 | 895 |
| 26.6 | 269 | 255 | 56 | 125 | 89 | 865 |
| 25.2 | 261 | 248 | 55 | 123 | 87 | 849 |
| 24.3 | 255 | 241 | 53 | 118 | 84 | 818 |
| 23.0 | 247 | 235 | 51 | 114 | 81 | 787 |
| 22.0 | 241 | 229 | 50 | 112 | 79 | 772 |
| 20.8 | 234 | 223 | 49 | 110 | 77 | 756 |
| 228 | 217 | 48 | 107 | 76 | 741 | |
Rockwell B
|
Vickers
|
Brinell
|
Tons/in2 |
1000lb/in2 |
kg/mm2 |
MPa |
| 98 | 222 | 212 | 46 | 103 | 73 | 710 |
| 97 | 218 | 207 | 45 | 101 | 71 | 695 |
| 96 | 212 | 197 | 43 | 97 | 68 | 664 |
| 93 | 196 | 187 | 41 | 92 | 65 | 632 |
| 91 | 188 | 179 | 39 | 88 | 62 | 602 |
| 88.5 | 178 | 170 | 36 | 81 | 57 | 556 |
| 86 | 171 | 163 | 35 | 78 | 55 | 540 |
| 84.2 | 163 | 156 | 34 | 76 | 54 | 525 |
| 82 | 156 | 149 | 32 | 72 | 51 | 494 |
| 80 | 150 | 143 | 31 | 69 | 49 | 479 |
| 77 | 143 | 137 | 30 | 67 | 48 | 463 |
| 75 | 137 | 131 | 29.5 | 66 | 47 | 455 |
| 72.5 | 132 | 126 | 29 | 65 | 46 | 448 |
| 70 | 127 | 121 | 28 | 63 | 44 | 432 |
| 67 | 122 | 116 | 26 | 58 | 42 | 401 |
The above information was provided courtesy of
H.E. Supplies (Hobby Engineering)Dynamic hobbies including remote control cars, boats, planes, helicopters and other models.
www.hobbyparts.com.au
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Images and videos used on the Cold Rick site are to the best of our knowledge public domain. Anything found to be breaching copyright will be removed immediately. Articles on the Cold Rick site remain the property of the writer/submitter and the opinions stated in these articles are not necessarily the opinions of the Cold Rick site or its editors. A random Youtube video from our favourites collection OGDENS NUT GONE FLAKE SMALL FACES
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