26
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.
100 Barr Harbor Drive, West Conshohocken, PA 19428-2959
_____________________________________________________________________________________________________
ASTM Hardness
Minimum Thickness Requirements
Minimum allowable thickness for a corresponding hardness in the respective scales
Minimum Minimum
-
Rockwell
-
-
-
Superficial Rockwell
- -
thickness
thickness
C A B
15N
30N
45N 15T
30T
45T
in.
mm
0.006 0.15
92
0.008 0.20
90
0.010 0.25
88
91
0.012 0.30
83 82
77
86
0.014 0.36
76 78.5
74
81
80
0.016 0.41
86
68 74
72
75
72 71
0.018 0.46
84
66
68
68
64 62
0.020 0.51
82
57
63
55 53
0.022 0.56 69 79
47
58
45 43
0.024
0.61 67 76 94 51
34 31
0.026
0.66 65 71 87 37
18
0.028
0.71 62 67 80 20
4
0.030
0.76 57 60 71
0.032
0.81
52 62
0.034
0.86
45 52
0.036
0.91
37 40
0.038
0.96
28 28
0.040 1.02 20
The above tables are from ASTM E 18.
Reprinted from the Annual Book of ASTM Standards, copyright American Society for Testing and Materials.
100 Barr Harbor Drive, West Conshohocken, PA 19428-2959