Steel Hardness Conversion Table

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 COVERSION CALCULATOR

Brinell Hardness HB Rockwell C - HRC Rockwell B - HRB Vickers - HV  
Enter a figure into any of the fields and click calculate, the nearest values in each scale is shown,
or zero if out of range. Values are approximate and for guidance only.

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)

Reference table: Steel Hardness conversion chart

Since the various types of hardness tests do not all measure the same combination of material properties, conversion from one hardness scale to another is only an approximate process. Because of the wide range of variation among different materials, it is not possible to state confidence limits for the errors in using a conversion chart.