Kyocera-SGS-Catalog-2019-web

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Hardness Conversion Chart
ROCKWELL
HARDNESS
(HRb)
ROCKWELL
HARDNESS
(HRc)
BRINELL
HARDNESS
(HB)
VICKERS
HARDNESS
(HV)
TENSILE
STRENGTH
(N/mm2)
PSI
(1000lb/in2)
67 – 121 122 401 58
70 – 126 127 432 63
73 – 132 132 448 65
75 – 136 137 455 66
77 – 140 143 463 67
80 – 147 150 479 69
82 – 153 156 494 72
84 – 159 163 525 76
86 – 165 171 540 78
89 – 177 178 556 81
91 – 186 188 602 88
93 – 197 196 632 92
96 – 216 212 664 97
97 – 223 218 695 101
98 21 230 234 756 110
– 22 236 241 772 112
– 23 242 247 787 114
– 24 248 255 818 118
– 25 254 261 849 123
– 27 266 269 865 125
– 28 272 275 895 130
– 29 278 284 911 132
– 30 284 292 942 136
– 31 293 300 973 141
– 32 302 308 988 143
– 33 310 318 1019 147
– 34 319 327 1050 152
– 35 328 337 1096 159
– 37 345 349 1127 163
– 38 353 359 1158 168
– 39 362 370 1189 172
– 40 370 381 1235 179
– 41 381 395 1266 183
– 42 391 408 1312 190
– 44 411 422 1359 197
– 45 422 437 1420 206
– 46 433 452 1467 212
– 48 455 470 1513 219
– 50 479 497 1559 226
– 51 485 517 1621 235
– 52 497 532 1668 241
– 54 – 573 1729 250
– 56 – 609 1807 262
– 57 – 630 1884 273
– 59 – 670 1961 284
– 60 – 698 2039 295
– 61 – 725 – –
– 62 – 740 – –
– 63 – 780 – –
– 64 – 812 – –
– 65 – 847 – –
– 66 – 885 – –
– 67 – 926 – –
– 68 – 971 – –
Conversions from each scale are approximate
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