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ASTM Hardness Conversion Chart

Rockwell C Hardness Range

Approximate Hardness Conversion Numbers for Non-Austenitic Steels, According to ASTM E-140
The Conversion Values contained herein should be considered approximate only and may be inaccurate for specific applications

C A D 15N 30N 45N Vickers Knoop Brinell Tensile
150 kgt 60 kgt 100kgt 15kgt 30 kgt 45 kgt Hardness Hardness Hardness Strength
diamond diamond diamond diamond diamond diamond   500gr 3000kgt 1000 lbs/
              and over 10mm ball square in
68 85.6 76.9 93.2 84.4 75.4 940 920 .. ..
67 85.0 76.1 92.9 83.6 74.2 900 895 .. ..
66 84.5 75.4 92.5 82.8 73.3 865 870 .. ..
65 83.9 74.5 92.2 81.9 72.0 832 846 (739)  
64 83.4 73.8 91.8 81.1 71.0 800 822 (722)  
63 82.8 73.0 91.4 80.1 69.9 772 799 (705)  
62 82.3 72.2 91.1 79.3 68.8 745 776 (688)  
61 81.8 71.5 90.7 78.4 67.7 720 754 (670)  
60 81.2 70.7 90.2 77.5 66.6 697 732 (654)  
59 80.7 69.9 89.8 76.6 65.5 674 710 (634) 351
58 80.1 69.2 89.3 75.7 64.3 653 690 615 338
57 79.6 68.5 88.9 74.8 63.2 633 670 595 325
56 79.0 67.7 88.3 73.9 62.0 613 650 577 313
55 78.5 66.9 87.9 73.0 60.9 595 630 560 301
54 78.0 66.1 87.4 72.0 59.8 577 612 543 292
53 77.4 65.4 86.9 71.2 58.6 560 594 525 283
52 76.8 64.6 84.4 70.2 57.4 544 576 512 273
51 76.3 63.8 85.9 69.4 56.1 528 558 496 264
50 75.9 63.1 85.5 68.5 55.0 513 542 481 255
49 75.2 62.1 85.0 67.6 53.8 498 526 469 246
48 74.7 61.4 84.6 66.7 52.5 484 510 455 237
47 74.1 60.8 83.9 65.8 51.4 471 495 443 229
46 73.6 60 83.5 64.8 50.3 458 480 432 221
45 73.1 59.2 83.0 64.0 49.0 446 466 421 215
44 72.5 58.5 82.5 63.1 47.8 434 452 409 208
43 72.0 57.7 82.0 62.2 46.7 423 438 400 201
42 71.5 56.9 81.5 61.3 45.5 412 426 390 195
41 70.9 56.2 80.9 60.4 44.3 402 414 381 188
40 70.4 55.4 80.4 59.5 43.1 392 402 371 182
39 69.9 54.6 79.9 58.6 41.9 382 391 362 177
38 69.4 53.8 79.4 57.7 40.8 372 380 353 171
37 58.9 53.1 78.8 56.8 39.6 363 370 344 166
36 68.4 52.3 78.3 55.9 38.4 354 360 336 161
35 67.9 51.5 77.7 55.0 37.2 345 351 327 156
34 67.4 50.8 77.2 54.2 36.1 336 342 319 152
33 66.8 50.0 76.6 53.3 34.9 327 334 311 149
32 66.3 49.2 76.1 52.1 33.7 318 326 301 146
31 65.8 48.4 75.6 51.3 32.5 310 318 294 141
30 65.3 47.7 75.0 50.4 31.3 302 311 286 138
29 64.8 47.0 74.5 49.5 30.1 294 304 279 135
28 64.3 46.1 73.9 48.6 28.9 286 297 271 131
27 63.8 45.2 73.3 47.7 27.8 279 290 264 128
26 63.3 44.6 72.8 46.8 26.7 272 284 258 125
25 62.8 43.8 72.2 45.9 25.5 266 278 253 123
24 62.4 43.1 71.6 45.0 24.3 260 272 247 119
23 62.0 42.1 71.0 44.0 23.1 254 266 243 117
22 61.5 41.6 70.5 43.2 22.0 248 261 237 115
21 61.0 40.9 69.9 42.3 20.7 243 256 231 112
20 60.5 40.1 69.4 41.5 19.6 238 251 226 110
                   

 

Rockwell B Hardness Range

Approximate Hardness Conversion Numbers for Non-Austenitic Steels, according to ASTM E-140
The conversion values contained herein should be considered approximate only and may be inaccurate for Specific applications.

  Rockwell   Superficial Rockwell   Vickers Knoop Brinell Tensile Brinelll
B A E 15T 30T 45T Hardness Hardness Hardness Strength Hardness
100kgf 60 kgf 100 kgf 15 kgf 30 kgf 45 kg f   500gf 3000 kgf 1000 lbs/ 500 kgf
1/16"ball diamond 1/8" ball 1/16" ball 1/16"ball 1/16" ball   and over 10mm ball square in 10mm ball
100 61.5   93.1 83.1 72.9 240 261 240 116 201
99 60.9   82.8 82.5 71.9 234 246 234 114 195
98 602   92.5 81.8 709 228 241 228 109 189
97 59.5   92.1 81.1 699 222 236 222 105 184
96 58.9   91.8 80.4 689 216 231 216 102 179
95 58.3   91.5 79.8 67.9 210 226 210 100 175
94 57.6   91.2 79.1 669 205 221 205 98 171
93 57   90.8 784 659 200 216 200 94 167
92 56.4   90.5 77.8 64.8 195 211 195 92 163
91 55.8   90.2 77.1 63.8 190 206 190 90 160
90 55.2   89.9 76.4 62.8 186 201 186 89 157
89 54.6   89.5 76.8 61.8 180 196 180 88 164
88 64.0   89.2 75.1 60.8 176 192 176 86 151
87 53.4   88.9 74.4 59.8 172 188 172 84 148
86 52.8   88.6 73.8 58.8 169 184 169 83 145
85 52.3   88.2 73.1 57.8 165 180 165 82 142
84 51.7   87.9 72.4 56.8 162 176 162 81 140
83 51.1   87.6 71.8 55.8 159 173 159 80 137
82 50.6   87.3 71.1 54.8 156 170 156 76 135
81 50   86.9 70.4 53.8 153 167 153 73 133
80 49.5   86.6 69.7 52.8 150 164 150 72 130
79 48.9   86.3 69.1 51.8 147 161 147 70 128
78 48.4   86.0 68.4 50.8 144 158 144 69 126
77 47.9   85.6 67.7 49.8 141 155 141 68 124
76 47.3   85.3 67.1 48.8 139 152 139 67 122
75 46.8   86.0 66.4 47.8 137 150 137 66 120
74 46.3   84.7 65.7 46.8 135 147 135 66 118
73 45.8   84.3 65.1 45.8 132 145 132 64 116
72 45.3   84.0 64.4 44.8 130 143 130 63 114
71 44.8 100 83.7 63.7 43.8 127 141 127 62 112
70 44.3 99.5 83.4 63.1 42.8 125 139 125 61 110
69 43.8 99.0 83.0 62.4 41.8 123 137 123 60 109
68 43.3 98.0 82.7 61.7 40.8 121 135 121 59 108
67 42.8 97.5 82.4 61 39.8 119 133 119 58 106
66 42.3 97.0 82.1 60.4 38.7 117 131 117 57 104
65 41.8 96.0 81.8 59.7 37.7 116 129 116 56 102
64 41.4 95.5 81.4 59 36.7 114 127 114   100
63 40.9 95.0 81.1 58.4 35.7 112 125 112   99
62 40.4 94.5 80.8 57.7 34.7 110 124 110   98
61 40.0 93.5 80.5 57.0 33.7 108 122 108   96
60 39.5 93.0 80.1 56.4 32.7 107 120 107   95
59 39.0 92.5 79.8 55.7 31.7 106 118 106   94
58 38.6 92.0 79.5 55 30.7 104 117 104   92
57 38.1 91.0 79.2 54.4 2.97 103 115 103   91
56 37.7 90.6 78.8 53.7 28.7 101 114 101   90
55 37.2 90.0 78.6 53.0 27.7 100 112 100   89
54 36.8 89.5 78.2 52.4 26.7   111     87
53 36.3 89.0 77.9 51.7 26.7   110     86
52 35.9 88.0 77.5 51.0 24.7   109     85
51 35.5 87.6 77.2 50.3 23.7   108     84
50 35.0 87.0 76.9 49.7 22.7   107     83
49 34.6 86.5 76.6 49.0 21.7   106     82
48 34.1 85.5 76.2 48.3 20.7   105     81
47 33.7 85 75.9 47.7 19.7   104     80
46 33.3 84.6 76.6 47.0 18.7   103     80
45 32.9 84 76.3 46.3 17.7   102     79
44 32.4 83.5 74.9 45.7 16.7   101     78
43 32.0 82.5 74.6 45.0 15.7   100     77
42 31.6 82 74.3 44.3 14.7   99     76
41 31.2 81.5 74.0 43.7 13.6   98     75
40 30.7 81 73.6 43.0 12.6   97     75
39 30.3 80 73.3 42.3 11.6   96     74
38 29.9 79.5 73.0 41.6 10.6   95     73
37 29.5 79 72.7 41.0 9.6   94     72
36 29.1 78.5 72.3 40.3 8.6   93     72
35 28.7 78.0 72.0 39.6 7.6   92     71
34 28.2 77.0 71.7 39.0 6.6   91     70
33 27.8 76.6 71.4 38.3 5.6   90     69
32 27.4 76.0 71.0 37.6 4.6   89     69
31 27.0 75.5 70.7 37.0 3.6   88     68
30 26.6 75.0 70.4 36.3 2.6   87     67
Hardness values in brackets are outside the range recommended for Brinell testing in ASTM E-10.
The above table is from ASTM E-110 except values for E-scale and Tensile Strength which are not from or according to ASTM Standards.
Reprinted from the Annual Book of ASTM Standards, copyright American Society for Testing and Materials.

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