| RELATION OF HARDNESS TO STRENGTH OF STEELS | ||||||
| BRINELL | Diamond Pyramid Hardness Number 50 Kg. Loaf | ROCKWELL | Shore Scleroscope Number | Tensile Strength 1000 Lbs. Per Sq. In. | ||
| Diam in Mm., 3000-Kg. Load, 10 Mm. Ball | Hardness Number Standard Ball | C Scale 150-Kg. Load. 120-Deg. Diamond Cone | B Scale. 100-Kg. Load, 1/16 In. Diam Ball | |||
| 2.25 | *745 | 1050 | 68 | -- | 100 | 368 |
| 2.30 | *710 | 780 | 63 | -- | 87 | 350 |
| 2.35 | *682 | 737 | 62 | -- | 84 | 340 |
| 2.40 | *653 | 697 | 60 | -- | 81 | 330 |
| 2.45 | *627 | 667 | 59 | -- | 79 | 323 |
| 2.50 | *601 | 640 | 57 | -- | 77 | 309 |
| 2.55 | *578 | 615 | 56 | -- | 75 | 297 |
| 2.60 | *555 | 591 | 55 | 120 | 73 | 285 |
| 2.65 | *534 | 569 | 54 | 119 | 71 | 274 |
| 2.70 | *514 | 547 | 53 | 119 | 70 | 263 |
| 2.75 | 495 | 536 | 52 | 117 | 69 | 259 |
| 2.80 | 477 | 516 | 50 | 117 | 67 | 247 |
| 2.85 | 461 | 495 | 49 | 116 | 65 | 237 |
| 2.90 | 444 | 474 | 47 | 115 | 63 | 226 |
| 2.95 | 429 | 455 | 46 | 115 | 61 | 217 |
| 3.00 | 415 | 440 | 45 | 114 | 59 | 210 |
| 3.05 | 401 | 425 | 43 | 113 | 58 | 202 |
| 3.10 | 388 | 410 | 42 | 112 | 56 | 195 |
| 3.15 | 375 | 396 | 40 | 112 | 54 | 188 |
| 3.20 | 363 | 383 | 39 | 110 | 52 | 182 |
| 3.25 | 352 | 372 | 38 | 110 | 51 | 176 |
| 3.30 | 341 | 360 | 37 | 109 | 50 | 170 |
| 3.35 | 331 | 350 | 36 | 109 | 48 | 166 |
| 3.40 | 321 | 339 | 34 | 108 | 47 | 160 |
| 3.45 | 311 | 328 | 33 | 108 | 46 | 155 |
| 3.50 | 302 | 319 | 32 | 107 | 45 | 150 |
| 3.55 | 293 | 309 | 31 | 106 | 43 | 145 |
| 3.60 | 285 | 301 | 30 | 106 | 42 | 141 |
| 3.65 | 277 | 292 | 29 | 105 | 41 | 137 |
| 3.70 | 269 | 284 | 28 | 104 | 40 | 133 |
| 3.75 | 262 | 276 | 27 | 103 | 39 | 129 |
| 3.80 | 255 | 269 | 25 | 102 | 38 | 126 |
| 3.85 | 248 | 261 | 24 | 101 | 37 | 122 |
| 3.90 | 241 | 253 | 23 | 100 | 36 | 118 |
| 3.95 | 235 | 247 | 22 | 99 | 35 | 115 |
| 4.00 | 229 | 241 | 21 | 98 | 34 | 111 |
| 4.05 | 223 | 234 | 19 | 97 | 33 | 108 |
| 4.10 | 217 | 228 | 18 | 96 | 33 | 105 |
| 4.15 | 212 | 222 | 16 | 96 | 32 | 102 |
| 4.20 | 207 | 218 | 15 | 95 | 32 | 100 |
| 4.25 | 201 | 212 | 14 | 94 | 31 | 98 |
| 4.30 | 197 | 207 | 13 | 93 | 30 | 95 |
| 4.35 | 192 | 202 | 12 | 92 | 29 | 93 |
| 4.40 | 187 | 196 | 10 | 91 | 28 | 90 |
| 4.45 | 183 | 192 | 9 | 90 | 28 | 89 |
| 4.50 | 179 | 188 | 8 | 89 | 27 | 87 |
| 4.55 | 174 | 182 | 6 | 88 | 26 | 85 |
| 4.60 | 170 | 178 | 5 | 87 | 26 | 83 |
| 4.65 | 167 | 175 | 4 | 86 | 25 | 81 |
| 4.70 | 163 | 171 | 3 | 85 | 25 | 79 |
| 4.80 | 156 | 163 | 1 | 83 | 24 | 76 |
| 4.90 | 149 | 156 | -- | 81 | 23 | 73 |
| 5.00 | 143 | 150 | -- | 79 | 22 | 71 |
| 5.10 | 137 | 143 | -- | 76 | 21 | 67 |
| 5.20 | 131 | 137 | -- | 74 | 20 | 65 |
| 5.30 | 126 | 132 | -- | 72 | 20 | 63 |
| 5.40 | 121 | 127 | -- | 70 | 19 | 60 |
| 5.50 | 116 | 122 | -- | 68 | 18 | 58 |
| 5.60 | 111 | 117 | -- | 66 | 15 | 56 |
| 5.70 | 107 | 107 | -- | 64 | -- | 55 |
| 5.80 | 103 | 103 | -- | 61 | -- | 53 |
| 5.90 | 99 | 99 | -- | 59 | -- | 51 |
| 6.00 | 95 | 95 | -- | 56 | -- | 49 |