Hardness Conversion Table

  • November 2019
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ROCKWELL Diamond Brale

1/16" Bull

150 kgm 60 kgm A 100 kgm 100 kgm C Scale Scale D Scale B Scale 80 92 87 79 92 86 78 91 85 77 91 84 76 90 83 75 90 83 74 89 82 73 89 81 72 88 80 71 87 80 70 87 79 69 86 78 68 86 77 67 85 76 66 85 76 65 84 75 64 84 74 63 83 73 62 83 73 61 82 72 60 81 71 59 81 70 58 80 69 57 80 69 56 79 68 55 79 67 54 78 66 53 77 65 52 77 65 51 76 64 50 76 63 49 75 62 48 75 61 47 74 61 46 73 60 45 73 59

SUPERFICIAL ROCKWELL

BRINELL 10 m/m Ball

"N" Brale Penetrater

3000 kgm Load

Diam. Of 15 kg Ball Load 15 30 kg 45 kg Impressio Hardness N Load 30N Load 45N n in m/m Number 97 92 87 92 87 96 91 86 91 85 96 90 84 89 83 95 89 82 88 81 95 87 80 87 79 94 86 78 94 85 77 85 79 93 84 75 93 83 73 92 82 72 2.25 745 81 74 2.3 710 92 80 70 2.3 710 91 79 69 2.35 682 91 79 68 2.35 682 90 78 67 2.4 653 90 77 66 2.45 627 89 76 65 2.55 578 89 75 63 2.55 578 88 74 62 2.6 555 88 73 61 2.6 555 87 72 60 2.65 534 87 71 59 2.7 514 86 70 57 2.75 495 86 69 56 2.75 495 86 69 55 2.8 477 85 68 54 2.85 461 85 67 53 2.9 444 84 66 51 2.9 444 84 65 50 2.95 432 83 64 49 3 415

VICKERS OR FIRTH DIAMOND HARDNE SS NUMBER

1865 1787 1710 1633 1556 1478 1400 1323 1245 1160 1076 1004 942 894 854 820 789 763 746 720 697 674 653 633 613 595 577 560 544 528 513 498 484 471 458 446

44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 18 16* 14* 12* 10* 8* 6* 4* 2* 0*

73 72 72 71 70 70 69 69 68 68 67 67 66 66 65 65 64 64 63 63 62 62 62 61 61

59 58 57 56 55 55 54 53 52 52 51 50 49 48 48 47 46 45 45 44 43 42 42 41 40

109 109 108 108 107 106 106 105 104 103 103 102 101 100 99 99 98 97 95 94 92 90 89 87 85 84 82 81 79 77 74 72 70 68 65

83 82 82 81 80 80 79 79 78 78 77 77 76 76 75 75 74 73 73 72 72 71 71 70 69

63 62 61 60 60 59 58 57 56 55 54 53 52 51 50 50 49 48 47 46 45 44 43 42 42

48 47 46 44 43 42 41 40 39 37 36 38 34 33 32 30 29 28 27 26 24 23 22 21 20

3 3.05 3.1 3.1 3.15 3.2 3.25 3.3 3.35 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.8 3.85 3.9 3.95 4 4.05 4.1 4.15 4.25 4.35 4.4 4.5 4.6 4.65 4.8 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6

415 401 388 388 375 363 352 341 331 331 321 311 302 293 285 277 269 262 255 255 248 241 235 229 223 217 212 203 192 187 179 170 166 156 156 149 143 137 131 126 121 116 112

434 423 412 402 392 382 372 363 354 345 336 327 318 310 302 294 286 279 272 266 260 254 248 243 238 230 222 213 204 195 187 180 173 166 160 156 150 143 137 132 127 122 117

TENSILE SCLERO- STRENG SCOPE TH

Equivalen t 1000 lb. Sq. In.

99 98 97 96 95 93 91 88 87 85 83 82 80 78 77 75 74 72 71 69 68 67 65 64 63 62 61

326 315 304 294 287 279 269 261 254 245 238 232 225 219 211

59 58 56 55 54 53 51 50 49 48 46 45 44 43 42 41 40 39 38 37 37 36 35 35 34 33 32 31 29 28 27 26 25 25 25 23 22 21 20 19 18 15

206 202 198 191 185 181 176 171 168 163 159 154 150 146 142 138 134 131 126 124 122 118 116 113 111 107 102 98 92 90 87 83 79 77 74 73 70 67 65 62 60 58 56

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