Hardness Conversion Table Brinell Hardness Rockwell Hardness Steel Tungsten Carbide Ball 3000 kg A Scale 60 kg B Scale 100 kg C Scale 150 kg Tensile Stength (approx.) PSI – 86 – 68 – – 85 – 68 – – 85 – 67 – 767 85 – 66 – 757 84 – 66 – 745 84 – 65 – 733 84 – 65 – 722 83 – 64 – 712 – – – – 710 83 – 63 – 698 83 – 62 – 684 82 – 62 – 682 82 – 62 – 670 82 – 61 – 656 81 – 60 – 653 81 – 60 – 647 81 – 60 – 638 81 – 59 329,000 630 81 – 59 324,000 627 80 – 59 323,000 601 80 – 57 309,000 578 79 – 56 297,000 555 78 – 55 285,000 534 78 – 54 274,000 514 77 – 52 263,000 495 76 – 51 253,000 477 76 – 50 243,000 461 75 – 48 235,000 444 74 – 47 225,000 429 73 – 46 217,000 415 73 – 44 210,000 401 72 – 43 202,000 388 71 – 42 195,000 375 71 – 40 188,000 363 70 – 39 182,000 352 69 – 38 176,000 341 69 – 37 170,000 331 68 – 36 166,000 321 68 – 34 160,000 311 67 – 33 155,000 302 66 – 32 150,000 293 66 – 31 145,000 285 65 – 30 141,000 277 65 – 29 137,000 269 64 – 28 133,000 262 64 – 27 129,000 255 63 – 25 126,000 248 62 – 24 122,000 241 62 100 23 118,000 235 61 99 22 115,000 229 61 98 20 111,000 223 – 97 20 – 217 – 96 18 105,000 212 – 96 17 102,000 207 – 95 16 100,000 201 – 94 15 98,000 197 – 93 – 95,000 192 – 92 – 93,000 187 – 91 – 90,000 183 – 90 – 89,000 179 – 89 – 87,000 174 – 88 – 85,000 170 – 87 – 83,000 167 – 86 – 81,000 163 – 85 – 79,000 156 – 83 – 76,000 149 – 81 – 73,000 143 – 79 – 71,000 137 – 76 – 67,000 131 – 74 – 65,000 126 – 72 – 63,000 121 – 70 – 60,000 116 – 68 – 58,000 111 – 66 – 56,000