Steel Hardness Conversion Table

Hardness ranges for heat treated steel

Heat
Treated
Condition
QRSTUVWXZ
Tensile
Strength
625-775 n/mm2700-850 n/mm 2775-925 n/mm2850-1000 n/mm2925-1075 n/mm21000-1150 n/mm21075-1225 n/mm21150-1300 n/mm21550 n/mm 2
Hardness
Brinell
179-229201-225223-277248-302269-331293-352311-375345-401444

STEEL HARDNESS COVERSION CALCULATOR

Brinell Hardness HBRockwell C - HRCRockwell 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
80072  
78071  
76070   
75269  
74568  
74667  
73566  
71165  
69564  
681 63  
65862  
64261  
62760   
61359  
60158 746
59257 727
57256 694
55255 649
53454120589
51353119 567
50452118549
48651118531
46950117505
468 49117497
456481164901569
445471154741520
43046115458 1471
419451144481447
415441144381422
402431144241390
388 421134061363
375411123931314
373401113881265
36039111 3761236
348381103611187
341371093511157
331361093421118
322351083321089
314341083201049
308331073111035
30032107 3031020
29031106292990
27730105285971
27129104277941
26428103271892
26227103262880
25526102258870
25025101 255853
24524100252838
24023100247824
2332299241794
2292198235775
2232097227755
2161996222716
2121895 218706
2081795210696
2031694201680
1991593199667
1911492197657
1901392186648
1861291184637
1831190183 617
1801089180608
175988178685
170787175559
167 686172555
166586168549
163485162539
160384160535
156283158530
154182152515
149 81149500
147  80147490
143 79146482
141 78144481
139 77142 480
137 76140475
135 75137467
131 74134461
127 72129451
121 70127431
116 68124422
114  67121412
111 66118402
107 64115382
105 62112 378
103 61108373
95 56104
90 5295
81  4185
76 3780
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.