Conversion table of different kind of hardness
¡ô.Approximate conversion table of material hardness
HB
Vickers hardness
 Rockwell hardness
Scleroscope hardness
 Tensile strength
(approximate value)
(kg/mm2)
(N/mm2)		   HB
Vickers hardness
 Rockwell hardness
Scleroscope hardness
 Tensile strength
(approximate value)
(kg/mm2)
(N/mm2)
¦Õ10 ball£¬3000kgf ¦Õ10 ball£¬3000kgf
Standard ball
Carbide tungsten ball
Carbide tungsten ball
 (HRA) (HRB) (HRC) (HRD)
Standard ball
Carbide tungsten ball
Carbide tungsten ball
 (HRA) (HRB) (HRC) (HRD)
- - - 2200 95.5 - - - - -   461 - - 495 75.1 - 48.8 61.9 - 171(1680)
- - - 2099 93.5 - 83.0 - - - - 461 - 491 74.9 - 48.5 61.7 - 170(1670)
- - - 2021 93.0 - 82.0 - - - - - 461 491 74.9 - 48.5 61.7 65 170(1670)
- - - 1943 92.5 - 81.0 - - - 444 - - 474 74.3 - 47.2 61.0 - 163(1595)
- - - 1865 92.0 - 80.0 - - - - 444 - 472 74.2 - 47.1 60.8 - 162(1585)
- - - 1787 91.5 - 79.0 - - - - - 444 472 74.2 - 47.1 60.8 63 162(1585)
- - - 1710 91.0 - 78.0 - - -                    
- - - 1633 90.5 - 77.0 - - - 429 429 429 455 73.4 - 45.7 59.7 61 154(1510)
- - - 1556 90.0 - 76.0 - - - 415 415 415 440 72.8 - 44.5 58.8 59 149(1460)
- - - 1478 89.5 - 75.0 - - - 401 401 401 425 72.0 - 43.1 57.8 58 142(1390)
- - - 1400 89.0 - 74.0 - - - 388 388 388 410 71.4 - 41.8 56.8 56 136(1330)
- - - 1323 88.5 - 73.0 - - - 375 375 375 396 70.6 - 40.4 55.7 54 129(1270)
- - - 1245 88.0 - 72.0 - - -                    
- - - 1160 87.0 - 71.0 - - - 363 363 363 383 70.0 - 39.1 54.6 52 124(1220)
- - - 1076 86.5 - 70.0 - - - 352 352 352 372 69.3 110.0 37.9 53.6 51 120(1180)
- - - 1004 86.0 - 69.0 - - - 341 341 341 360 68.7 109.0 36.6 52.8 50 115(1130)
- - - 940 85.6 - 68.0 76.9 97 - 331 331 331 350 68.1 108.5 35.5 51.9 48 112(1095)
- - - 920 85.3 - 67.5 76.5 96 - 321 321 321 339 67.5 108.0 34.3 51.0 47 108(1060)
- - - 900 85.0 - 67.0 76.1 95 -                    
- - 767 880 84.7 - 66.4 75.1 93 - 311 311 311 328 66.9 107.5 33.1 50.0 46 105(1025)
- - 757 860 84.4 - 65.9 75.3 92 - 302 302 302 319 66.3 107.0 32.1 49.3 45 103(1005)
- - 745 840 84.1 - 65.3 74.8 91 - 293 293 293 309 65.7 106.0 30.9 48.3 43 99(970)
- - 733 820 83.8 - 64.7 74.3 90 - 285 285 285 301 65.3 105.5 29.9 47.6 - 97(950)
- - 722 800 83.4 - 64.0 73.8 88 - 277 277 277 292 64.6 104.5 28.8 46.7 41 94(925)
- - 712 - - - - - - -                    
- - 710 780 83.0 - 63.3 73.3 87 - 269 269 269 284 64.1 104.0 27.6 45.9 40 91(895)
- - 698 760 82.6 - 62.5 72.6 86 - 262 262 262 276 63.6 103.0 26.6 45.0 39 89(875)
- - 684 740 82.2 - 61.8 72.1 - - 255 255 255 269 63.0 102.0 25.4 44.2 38 86(850)
- - 682 737 82.2 - 61.7 72.0 84 - 248 248 248 261 62.5 101.0 24.2 43.2 37 84(825)
                    241 241 241 253 61.8 100.0 22.8 42.0 36 82(800)
- - 670 720 81.8 - 61.0 71.5 83 -                    
- - 656 700 81.3 - 60.1 70.8 - - 235 235 235 247 61.4 99.0 21.7 41.1 35 80(785)
- - 653 697 81.2 - 60.0 70.7 81 - 229 229 229 241 60.8 98.2 20.5 40.5 34 78(765)
- - 647 690 81.1 - 59.7 70.5 - - 223 223 23 234 - 97.3 18.8 - - -
                    217 217 217 228 - 96.4 17.5 - 33 74(725)
- - 638 680 80.8 - 59.2 70.1 80 - 212 212 212 222 - 95.5 16.0 - - 72(705)
- - 630 670 80.6 - 58.8 69.8 - -                    
                    207 207 207 218 - 94.6 15.2 - 32 70(690)
- - 627 667 80.5 - 58.7 69.7 79 - 201 201 201 212 - 93.8 13.8 - 31 69(675)
- 601 - 677 80.7 - 59.1 70.0 - - 197 197 197 207 - 92.8 12.7 - 30 67(655)
                    192 192 192 202 - 91.9 11.5 - 29 65(640)
- - 601 640 79.8 - 57.3 68.7 77 - 187 187 187 196 - 90.7 10.0 - - 63(620)
- 578 - 640 79.8 - 57.3 68.7 - -                    
                    183 183 183 192 - 90.0 9.0 - 28 63(615)
- - 578 615 79.1 - 56.0 67.7 75 - 179 179 179 188 - 89.0 8.0 - 27 61(600)
- 555 - 607 78.8 - 55.6 67.4 - - 174 174 174 182 - 87.8 6.4 - - 60(585)
                    170 170 170 178 - 86.8 5.4 - 26 58(570)
- - 555 591 78.4 - 54.7 66.7 73 210(2055) 167 167 167 175 - 86.0 4.4 - - 57(560)
- 534 - 579 78.0 - 54.0 66.1 - 206(2015£©                    
- - 534 569 77.8 - 53.5 65.8 71 202(1985) 163 163 163 171 - 85.0 3.3 - 25 56(545)
                    156 156 156 163 - 82.9 0.9 - - 53(525)
- 514 - 533 77.1 - 52.5 65.0 - 195(1915) 149 149 149 156 - 80.8 - - 23 51(505)
- - 514 547 76.9 - 52.1 64.7 70 193(1890) 143 143 143 150 - 78.7 - - 22 50(490)
495 - - 539 76.7 - 51.6 64.3 - 189(1855) 137 137 137 143 - 76.4 - - 21 47(460)
                                       
- 495 - 530 76.4 - 51.1 63.9 - 186(1825) 131 131 131 137 - 74.0 - - - 46(450)
- - 495 528 76.3 - 51.0 63.8 68 186(1820) 126 126 126 132 - 72.0 - - 20 44(435)
477 - - 516 75.9 - 50.3 63.2 - 182(1780) 121 121 121 127 - 69.8 - - 19 42(415)
- 477 - 508 75.6 - 49.6 62.7 - 178(1740) 116 116 116 122 - 67.6 - - 18 41(400)
- - 477 508 75.6 - 49.6 62.7 66 178(1740) 111 111 111 117 - 65.7 - - 15 39(385)
Remark 1N/mm2£½1Mpa
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