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  Hardness Conversion Chart    Steel hardness conversion table contains conversion factors for Rockwell, Vickers & Brinell. As a guide we show the theoretical conversion comparison of tonnes tensile in Newtons /mm² and MPa to steel hardness. N/mm² Brinell Tons Vickers Rockwell   N/mm² Brinell Tons Vickers Rockwell / MPa HB per sq in   C   / MPA  HB per sq in   B . . . 902 65   770 229 50 234 99 . . . 836 63   755 223 49 228 98 . . . 778 61   739 217 48 222 97 2033 601 132 715 59   693 212 46 217 97 1956 578 127 671 57   678 207 45 212 96 1879 555 122 633 56   662 201 44 206 95 1802 534 117 599 54   647 197 43 202 94 1725 514 112 572 52   631 192 42 197 93 1663 495 108 547 50   616 187 41 192 92 1617 477 105 523 49   601 183 40 188 91 1535 461 101 501 48   585 179 39 184 90 1509 444 98 479 47   585 174 38 179 89 1463 429 95 459 45   570 170 38 175 87 1417 415 92 441 44   560 167 37 172 86 1355 401 88 424 42   554 163 36 168 85 1309 388 85 409 41   554 159 36 164 84 1263 375 82 395 40   539 156 35 161 83 1232 363 80 382 39   524 152 35 157 82 1186 353 77 369 37   508 149 34 154 81 1155 341 75 356 36   508 145 33 151 80 1224 331 73 344 34   493 143 33 148 79 1093 321 71 332 33   493 140 32 145 78 1047 311 68 321 32   477 137 32 142 78 1016 302 66 310 31   462 134 31 139 77 986 293 64 299 30   462 131 30 136 75 970 285 63 290 29   447 128 30 133 73 939 277 61 282 27   447 126 29 131 72 909 269 59 274 26   431 123 28 128 70 893 262 58 267 25   431 121 28 126 69 862 255 56 260 24   416 118 27 123 67 847 248 55 253 22   416 116 27 121 66 816 241 53 246 21   400 114 26 119 64 785 235 51 240 20   385 111 25 116 63 All figures quoted on this chart are theoretical and for guidance only