References
■ Hardness Scale Comparison Chart ● Approximate corresponding values for steel hardness on the Brinell scale
Rockwell Hardness
Rockwell Hardness
A Scale 60kgf brale
B Scale 100kgf 1/10in ball HRB
C Scale 150kgf brale
D Scale 100kgf brale
A Scale 60kgf brale
B Scale 100kgf 1/10in ball HRB
C Scale 150kgf brale
D Scale 100kgf brale
Brinell 3,000kgf
Vickers 50kgf
Shore Hardness
Tensile Strength (GPa)
Brinell 3,000kgf
Vickers 50kgf
Shore Hardness
Tensile Strength (GPa)
HB HRD — 85.6 — 68.0 76.9 940 97 — — 85.3 — 67.5 76.5 920 96 — — 85.0 — 67.0 76.1 900 95 — 767 84.7 — 66.4 75.7 880 93 — 757 84.4 — 65.9 75.3 860 92 — 745 84.1 — 65.3 74.8 840 91 — 733 83.8 — 64.7 74.3 820 90 — 722 83.4 — 64.0 73.8 800 88 — 712 — — — — — — — HV HS HRA HRC 710 83.0 — 63.3 73.3 780 87 — 698 82.6 — 62.5 72.6 760 86 — 684 82.2 — 61.8 72.1 740 — — 682 82.2 — 61.7 72.0 737 84 — 670 81.8 — 61.0 71.5 720 83 — 656 81.3 — 60.1 70.8 700 — — 653 81.2 — 60.0 70.7 697 81 — 647 81.1 — 59.7 70.5 690 — — 638 80.8 — 59.2 70.1 680 80 — 630 80.6 — 58.8 69.8 670 — — 627 80.5 — 58.7 69.7 667 79 — 601 79.8 — 57.3 68.7 640 77 — 578 79.1 — 56.0 67.7 615 75 — 555 78.4 — 54.7 66.7 591 73 2.06 534 77.8 — 53.5 65.8 569 71 1.98 514 76.9 — 52.1 64.7 547 70 1.89 495 76.3 — 51.0 63.8 528 68 1.82 477 75.6 — 49.6 62.7 508 66 1.73 461 74.9 — 48.5 61.7 491 65 1.67 444 74.2 — 47.1 60.8 472 63 1.59 429 73.4 — 45.7 59.7 455 61 1.51 415 72.8 — 44.5 58.8 440 59 1.46 401 72.0 — 43.1 57.8 425 58 1.39 388 71.4 — 41.8 56.8 410 56 1.33 375 70.6 — 40.4 55.7 396 54 1.26 363 70.0 — 39.1 54.6 383 52 1.22 352 69.3 (110.0) 37.9 53.8 372 51 1.18 341 68.7 (109.0) 36.6 52.8 360 50 1.13 331 68.1 (108.5) 35.5 51.9 350 48 1.10
HRA
HRC
HRD
HB
HV
HS
321 67.5 (108.0)
34.3 50.1 339 47 1.06
N
311 66.9 (107.5)
33.1 50.0 328 46 1.03
302 66.3 (107.0)
32.1 49.3 319 45 1.01
293 65.7 (106.0)
30.9 48.3 309 43 0.97
285 65.3 (105.5)
29.9 47.6 301 — 0.95
277 64.6 (104.5)
28.8 46.7 292 41 0.92
269 64.1 (104.0)
27.6 45.9 284 40 0.89
262 63.6 (103.0)
26.6 45.0 276 39 0.87
255 63.0 (102.0)
25.4 44.2 269 38 0.84
248 62.5 (101.0) 24.2 43.2 261 37 0.82 241 61.8 100.0 22.8 42.0 253 36 0.80 235 61.4 99.0 21.7 41.4 247 35 0.78 229 60.8 98.2 20.5 40.5 241 34 0.76 223 — 97.3 (18.8) — 234 — — 217 — 96.4 (17.5) — 228 33 0.73 212 — 95.5 (16.0) — 222 — 0.71 207 — 94.6 (15.2) — 218 32 0.69 201 — 93.8 (13.8) — 212 31 0.68 197 — 92.8 (12.7) — 207 30 0.66 192 — 91.9 (11.5) — 202 29 0.64 187 — 90.7 (10.0) — 196 — 0.62 183 — 90.0 (9.0) — 192 28 0.62 179 — 89.0 (8.0) — 188 27 0.60 174 — 87.8 (6.4) — 182 — 0.59 170 — 86.8 (5.4) — 178 26 0.57 167 — 86.0 (4.4) — 175 — 0.56 163 — 85.0 (3.3) — 171 25 0.55 156 — 82.9 (0.9) — 163 — 0.52 149 — 80.8 — — 156 23 0.50 143 — 78.7 — — 150 22 0.49 137 — 76.4 — — 143 21 0.46 131 — 74.0 — — 137 — 0.45 126 — 72.0 — — 132 20 0.43 121 — 69.8 — — 127 19 0.41 116 — 67.6 — — 122 18 0.40 111 — 65.7 — — 117 15 0.38 1) Figures within the ( ) are not commonly used. 2) Rockwell A, C and D scales utilise a diamond brale. 3) This chart was taken from the JIS Iron and Steel Handbook (1980).
N72
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