Page 1658 - MiSUMi 2025
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[Technical Data]
                    Hardness Conversion Table                        (SAEJ417) *Revised in 1983





                 Approximate Conversion of Rockwell C Hardness Values for Steel (1)
                           Brinell Hardness (HB)               Rockwell Superficial Hardness
                             10mm Ball ,   Rockwell Hardness (3)  Diamond Cone Indenter
                            Load 3000kgf                                                 Tensile Strength
                  (HRC)  (HV)                                                         (Hs) (Approximated Value)  Rockwell
                 Rockwell  Vickers    (HRA) A Scale,   (HRB) B Scale,  (HRD) D Scale,   15-N   30-N   45-N   Shore   C-Scale
                  C-Scale        Tungsten     Load 100kgf,     Scale,   Scale,   Scale,     MPa   Hardness
                 Hardness  Hardness Standard  Carbide  Load 60kgf,   Diameter   Load 100kgf,   Hardness  (kgf/mm 2 )  (3)
                            Sphere  Sphere  Diamond Cone  1.6mm (1/16in)  Diamond Cone   Load   Load   Load   (2)
                                       Indenter  Sphere  Indenter  15kgf  30kgf  45kgf
                   68  940   -    -     85.6     -      76.9    93.2    84.4    75.4  97    -      68
                   67  900   -    -     85.0     -      76.1    92.9    83.6    74.2  95    -      67
                   66  865   -    -     84.5     -      75.4    92.5    82.8    73.3  92    -      66
                   65  832   -   (739)  83.9     -      74.5    92.2    81.9    72.0  91    -      65
                   64  800   -   (722)  83.4     -      73.8    91.8    81.1    71.0  88    -      64
                   63  772   -   (705)  82.8     -      73.0    91.4    80.1    69.9  87    -      63
                   62  746   -   (688)  82.3     -      72.2    91.1    79.3    68.8  85    -      62
                   61  720   -   (670)  81.8     -      71.5    90.7    78.4    67.7  83    -      61
                   60  697   -   (654)  81.2     -      70.7    90.2    77.5    66.6  81    -      60
                   59  674   -   (634)  80.7     -      69.9    89.8    76.6    65.5  80    -      59
                   58  653   -    615   80.1     -      69.2    89.3    75.7    64.3  78    -      58
                   57  633   -    595   79.6     -      68.5    88.9    74.8    63.2  76    -      57
                   56  613   -    577   79.0     -      67.7    88.3    73.9    62.0  75    -      56
                   55  595   -    560   78.5     -      66.9    87.9    73.0    60.9  74  2075 (212)  55
                   54  577   -    543   78.0     -      66.1    87.4    72.0    59.8  72  2015 (205)  54
                   53  560   -    525   77.4     -      65.4    86.9    71.2    58.5  71  1950 (199)  53
                   52  544  (500)  512  76.8     -      64.6    86.4    70.2    57.4  69  1880 (192)  52
                   51  528  (487)  496  76.3     -      63.8    85.9    69.4    56.1  68  1820 (186)  51
                   50  513  (475)  481  75.9     -      63.1    85.5    68.5    55.0  67  1760 (179)  50
                   49  498  (464)  469  75.2     -      62.1    85.0    67.6    53.8  66  1695 (173)  49
                   48  484   451  455   74.7     -      61.4    84.5    66.7    52.5  64  1635 (167)  48
                   47  471   442  443   74.1     -      60.8    83.9    65.8    51.4  63  1580 (161)  47
                   46  458   432  432   73.6     -      60.0    83.5    64.8    50.3  62  1530 (156)  46
                   45  446   421  421   73.1     -      59.2    83.0    64.0    49.0  60  1480 (151)  45
                   44  434   409  409   72.5     -      58.5    82.5    63.1    47.8  58  1435 (146)  44
                   43  423   400  400   72.0     -      57.7    82.0    62.2    46.7  57  1385 (141)  43
                   42  412   390  390   71.5     -      56.9    81.5    61.3    45.5  56  1340 (136)  42
                   41  402   381  381   70.9     -      56.2    80.9    60.4    44.3  55  1295 (132)  41
                   40  392   371  371   70.4     -      55.4    80.4    59.5    43.1  54  1250 (127)  40
                   39  382   362  362   69.9     -      54.6    79.9    58.6    41.9  52  1215 (124)  39
                   38  372   353  353   69.4     -      53.8    79.4    57.7    40.8  51  1180 (120)  38
                   37  363   344  344   68.9     -      53.1    78.8    56.8    39.6  50  1160 (118)  37
                   36  354   336  336   68.4   (109.0)  52.3    78.3    55.9    38.4  49  1115 (114)  36
                   35  345   327  327   67.9   (108.5)  51.5    77.7    55.0    37.2  48  1080 (110)  35
                   34  336   319  319   67.4   (108.0)  50.8    77.2    54.2    36.1  47  1055 (108)  34
                   33  327   311  311   66.8   (107.5)  50.0    76.6    53.3    34.9  46  1025 (105)  33
                   32  318   301  301   66.3   (107.0)  49.2    76.1    52.1    33.7  44  1000 (102)  32
                   31  310   294  294   65.8   (106.0)  48.4    75.6    51.3    32.7  43  980 (100)  31
                   30  302   286  286   65.3   (105.5)  47.7    75.0    50.4    31.3  42  950 (  97)  30
                   29  294   279  279   64.7   (104.5)  47.0    74.5    49.5    30.1  41  930 (  95)  29
                   28  286   271  271   64.3   (104.0)  46.1    73.9    48.6    28.9  41  910 (  93)  28
                   27  279   264  264   63.8   (103.0)  45.2    73.3    47.7    27.8  40  880 (  90)  27
                   26  272   258  258   63.3   (102.5)  44.6    72.8    46.8    26.7  38  860 (  88)  26
                   25  266   253  253   62.8   (101.5)  43.8    72.2    45.9    25.5  38  840 (  86)  25
                   24  260   247  247   62.4   (101.0)  43.1    71.6    45.0    24.3  37  825 (  84)  24
                   23  254   243  243   62.0   100.0    42.1    71.0    44.0    23.1  36  805 (  82)  23
                   22  248   237  237   61.5     99.0   41.6    70.5    43.2    22.0  35  785 (  80)  22
                   21  243   231  231   61.0     98.5   40.9    69.9    42.3    20.7  35  770 (  79)  21
                   20  238   226  226   60.5     97.8   40.1    69.4    41.5    19.6  34  760 (  77)  20
                  (18)  230  219  219    -       96.7   -       -       -       -     33  730 (  75)  (18)
                  (16)  222  212  212    -       95.5   -       -       -       -     32  705 (  72)  (16)
                  (14)  213  203  203    -       93.9   -       -       -       -     31  675 (  69)  (14)
                  (12)  204  194  194    -       92.3   -       -       -       -     29  650 (  66)  (12)
                  (10)  196  187  187    -       90.7   -       -       -       -     28  620 (  63)  (10)
                  (  8)  188  179  179   -       89.5   -       -       -       -     27  600 (  61)  (  8)
                  (  6)  180  171  171   -       87.1   -       -       -       -     26  580 (  59)  (  6)
                  (  4)  173  165  165   -       85.5   -       -       -       -     25  550 (  56)  (  4)
                  (  2)  166  158  158   -       83.5   -       -       -       -     24  530 (  54)  (  2)
                  (  0)  160  152  152   -       81.7   -       -       -       -     24  515 (  53)  (  0)
                 Note (1): Blue figures: Based on ASTM E 140, Table 1 (Jointly coordinated by SAE, ASM and ASTM).
                    (2):  The units and figures shown in brackets are the results of conversion from psi figures by reference to JIS Z 8413
                       and Z 8438 conversion tables.
                       Moreover, 1MPa=1N/mm 2
          B-013     (3): The figures in brackets are in ranges not frequently used. They are given as referential data.
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