Hardness Conversion Table

Approximate Relation of Brinell And Rockwell Hardness To Tensile Strength For Carbon Steel

Brinell Indent Dia. mm. Brinell 10-mm. Ball, 3000-kg. Load Rockwell Hardness Number Tensile Strength (Approx.) 1000 psi Brinell Indent Dia. mm. Brinell 10-mm. Ball, 3000-kg. Load Rockwell Hardness Number Tensile Strength (Approx.) 1000 psi
Hardness Number B-Scale 100-kg. Load 1/16" Diam. Ball C-Scale 150kg. Load Brale Penetrator Hardness Number B-Scale 100-kg. Load 1/16" Diam. Ball C-Scale 150kg. Load Brale Penetrator
- - - 68.0 - 3.00 415 - 44.5 210
- - - 67.5 - 3.05 401 - 43.1 202
- - - 67.0 - 3.10 388 - 41.8 195
- 767 - 66.4 - 3.15 375 - 40.4 188
- 757 - 65.9 - 3.20 363 - 39.1 182
2.25 745 - 65.3 - 3.25 352 (110.0) 37.9 1.76
- 733 - 64.7 - 3.30 341 (109.0) 36.6 170
- 722 - 64.0 - 3.35 331 (108.5) 35.5 166
2.30 712 - - - 3.40 321 (108.0) 34.3 160
- 710 - 63.3 - 3.45 311 (107.5) 33.1 155
- 698 - 62.5 - 3.50 302 (107.0) 32.1 150
- 684 - 61.8 - 3.55 293 (106.0) 30.9 145
2.35 682 - 61.7 - 3.60 285 (105.5) 29.9 141
- 670 - 61.0 - 3.65 277 (105.5) 28.8 137
- 656 - 60.1 - 3.70 269 (104.0) 27.6 133
2.40 653 - 59.7 - 3.75 262 (103.0) 26.6 129
- 647 - 59.7 - 3.80 255 (102.0) 25.4 126
- 638 - 59.2 329 3.85 248 (101.0) 24.2 122
- 630 - 58.8 324 3.90 241 100.0 22.8 118
2.45 627 - 58.7 323 3.95 235 99.0 21.7 115
2.50 601 - 59.1 328 4.00 229 98.2 20.5 111
- 601 - 57.3 309 4.05 223 973 (18.8) -
2.55 578 - 57.3 309 4.10 217 96.4 (17.5) 105
- 578 - 56.0 297 4.15 212 95.5 (16.0) 102
2.60 555 - 55.6 293 4.20 207 94.6 (15.2) 100
2.60 555 - 54.7 285 4.25 201 93.8 (13.8) 98
2.65 534 - 54.0 279 4.30 197 92.8 (12.7) 95
- 534 - 53.5 274 4.35 192 91.9 (11.5) 93
2.70 514 - 52.5 265 4.40 187 90.7 (10.0) 90
- 514 - 52.1 263 4.45 183 90.0 (9.0) 89
2.75 495 - 51.6 259 4.50 179 89.0 (8.0) 87
- 495 - 51.1 254 4.55 174 87.8 (6.4) 85
- 495 - 51.0 253 4.60 170 86.8 (5.4) 83
2.80 477 - 50.3 247 4.65 167 86.0 (4.4) 81
- 477 - 49.6 243 4.70 163 85.0 (3.3) 79
2.80 477 - 49.6 243 4.80 156 82.9 (0.9) 76
2.85 461 - 48.8 237 4.90 149 80.8 - 73
- 461 - 48.5 235 5.00 143 78.7 - 71
2.85 461 - 48.5 235 5.10 137 76.4 - 67
2.90 444 - 47.2 226 5.20 131 74.0 - 65
- 444 - 47.1 225 5.30 126 72.0 - 63
- 444 - 47.1 225 5.40 121 69.8 - 60
2.95 429 - 45.7 217 5.50 116 67.6 - 58
- 429 - 45.7 217 5.60 111 65.7 - 56
Values for Rockwell hardness in parentheses are beyond normal range, and are given for information only.
Brinell hardness No.'s 767 through 514 based on tests taken with tungsten carbide ball.

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.

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