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Hardness ConversionSteel
Hardness ranges for heat treated steel| Heat Treated Condition | Q | R | S | T | U | V | W | X | Z |
|---|---|---|---|---|---|---|---|---|---|
| Tensile Strength | 625-775 n/mm2 | 700-850 n/mm2 | 775-925 n/mm2 | 850-1000 n/mm2 | 925-1075 n/mm2 | 1000-1150 n/mm2 | 1075-1225 n/mm2 | 1150-1300 n/mm2 | 1550 n/mm2 |
| Hardness Brinell | 179-229 | 201-225 | 223-277 | 248-302 | 269-331 | 293-352 | 311-375 | 345-401 | 444 |
Steel Hardness Conversion Table
This table shows approximate hardness of steel using Brinell, Rockwell B and C and Vickers scales. These conversion charts are provided for guidance only as each scales uses different methods of measuring hardness. The right hand column show an approximate equivalent tensile strength.
Reference Table: Steel hardness conversion chart - all values approximate. | ||||
|---|---|---|---|---|
| Brinell Hardness HB | Rockwell HRC | Rockwell HRB | Vickers HV | N/mm² |
| 800 | 72 | |||
| 780 | 71 | |||
| 760 | 70 | |||
| 752 | 69 | |||
| 745 | 68 | |||
| 746 | 67 | |||
| 735 | 66 | |||
| 711 | 65 | |||
| 695 | 64 | |||
| 681 | 63 | |||
| 658 | 62 | |||
| 642 | 61 | |||
| 627 | 60 | |||
| 613 | 59 | |||
| 601 | 58 | 746 | ||
| 592 | 57 | 727 | ||
| 572 | 56 | 694 | ||
| 552 | 55 | 649 | ||
| 534 | 54 | 120 | 589 | |
| 513 | 53 | 119 | 567 | |
| 504 | 52 | 118 | 549 | |
| 486 | 51 | 118 | 531 | |
| 469 | 50 | 117 | 505 | |
| 468 | 49 | 117 | 497 | |
| 456 | 48 | 116 | 490 | 1569 |
| 445 | 47 | 115 | 474 | 1520 |
| 430 | 46 | 115 | 458 | 1471 |
| 419 | 45 | 114 | 448 | 1447 |
| 415 | 44 | 114 | 438 | 1422 |
| 402 | 43 | 114 | 424 | 1390 |
| 388 | 42 | 113 | 406 | 1363 |
| 375 | 41 | 112 | 393 | 1314 |
| 373 | 40 | 111 | 388 | 1265 |
| 360 | 39 | 111 | 376 | 1236 |
| 348 | 38 | 110 | 361 | 1187 |
| 341 | 37 | 109 | 351 | 1157 |
| 331 | 36 | 109 | 342 | 1118 |
| 322 | 35 | 108 | 332 | 1089 |
| 314 | 34 | 108 | 320 | 1049 |
| 308 | 33 | 107 | 311 | 1035 |
| 300 | 32 | 107 | 303 | 1020 |
| 290 | 31 | 106 | 292 | 990 |
| 277 | 30 | 105 | 285 | 971 |
| 271 | 29 | 104 | 277 | 941 |
| 264 | 28 | 103 | 271 | 892 |
| 262 | 27 | 103 | 262 | 880 |
| 255 | 26 | 102 | 258 | 870 |
| 250 | 25 | 101 | 255 | 853 |
| 245 | 24 | 100 | 252 | 838 |
| 240 | 23 | 100 | 247 | 824 |
| 233 | 22 | 99 | 241 | 794 |
| 229 | 21 | 98 | 235 | 775 |
| 223 | 20 | 97 | 227 | 755 |
| 216 | 19 | 96 | 222 | 716 |
| 212 | 18 | 95 | 218 | 706 |
| 208 | 17 | 95 | 210 | 696 |
| 203 | 16 | 94 | 201 | 680 |
| 199 | 15 | 93 | 199 | 667 |
| 191 | 14 | 92 | 197 | 657 |
| 190 | 13 | 92 | 186 | 648 |
| 186 | 12 | 91 | 184 | 637 |
| 183 | 11 | 90 | 183 | 617 |
| 180 | 10 | 89 | 180 | 608 |
| 175 | 9 | 88 | 178 | 685 |
| 170 | 7 | 87 | 175 | 559 |
| 167 | 6 | 86 | 172 | 555 |
| 166 | 5 | 86 | 168 | 549 |
| 163 | 4 | 85 | 162 | 539 |
| 160 | 3 | 84 | 160 | 535 |
| 156 | 2 | 83 | 158 | 530 |
| 154 | 1 | 82 | 152 | 515 |
| 149 | 81 | 149 | 500 | |
| 147 | 80 | 147 | 490 | |
| 143 | 79 | 146 | 482 | |
| 141 | 78 | 144 | 481 | |
| 139 | 77 | 142 | 480 | |
| 137 | 76 | 140 | 475 | |
| 135 | 75 | 137 | 467 | |
| 131 | 74 | 134 | 461 | |
| 127 | 72 | 129 | 451 | |
| 121 | 70 | 127 | 431 | |
| 116 | 68 | 124 | 422 | |
| 114 | 67 | 121 | 412 | |
| 111 | 66 | 118 | 402 | |
| 107 | 64 | 115 | 382 | |
| 105 | 62 | 112 | 378 | |
| 103 | 61 | 108 | 373 | |
| 95 | 56 | 104 | ||
| 90 | 52 | 95 | ||
| 81 | 41 | 85 | ||
| 76 | 37 | 80 | ||
| Brinell HB | Rockwell HRC | Rockwell HRB | Vickers HV | N/mm² |
| 3000kg 10mm Ball | 150kg Brale | 100kg 1/16" Ball | Diamond Pyramid 120kg | Tensile strength (Approx) |