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Hardness conversion table

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COLD ROLLED HIGH CARBON STEEL STRIP

Hardness Conversion Table

Rockwell Hardness Vickers
Hardness
Hv		 Brinell
Hardness
HB (10/500)
B
F
30-F
100
113.3
80.8
235
202
99
112.7
80.1
229
195
98
112.1
79.5
224
189
97
111.6
78.9
218
184
96
111.0
78.2
214
179
95
110.5
209
175
94
109.9
77.6
205
171
93
109.3
76.9
200
167
92
108.8
75.7
196
163
91
108.2
75.0
192
160
90
107.7
74.4
188
157
89
107.1
73.7
184
154
88
106.6
73.1
180
151
87
106.0
72.4
176
148
86
105.4
71.8
173
145
85
104.9
71.2
170
142
84
104.3
70.5
166
140
83
103.8
69.9
163
137
82
103.2
69.2
160
135
81
102.6
68.6
156
133
80
68.0
154
130
79
102.1
67.3
150
128
78
101.5
66.7
147
126
77
101.0
66.0
145
124
76
99.9
65.4
142
122
75
99.3
64.8
140
120
74
98.7
64.1
137
118
73
98.2
63.5
134
116
72
97.6
62.8
132
114
71
97.1
62.2
129
112
70
96.5
61.6
127
110
69
95.9
60.9
125
109
68
95.4
60.3
123
107
67
94.8
59.6
120
106
66
94.3
59.0
119
104
65
93.7
58.4
117
102
64
93.2
57.7
115
101
63
92.6
57.1
113
99
62
92.0
56.4
111
98
61
91.5
55.8
109
96
60
90.9
55.2
107
95
59
90.4
54.5
106
94
58
89.8
53.9
104
92
57
89.2
53.2
103
91
56
88.7
52.6
102
90
55
88.1
51.9
100
89
54
87.5
51.3
99
87
53
87.0
50.7
98
86
52
86.5
50.0
96
85
51
85.9
49.4
95
84
50
85.3
48.7
94
83
49
84.8
48.1
93
82
48
84.2
47.5
92
81
47
83.7
46.8
91
80
46
83.1
46.2
90
79
45
82.5
45.5
89
79
44
82.0
44.9
88
78
43
81.4
44.3
87
77
42
80.9
43.6
86
76
41
80.3
43.0
85
75
40
79.8
42.3
84
75
39
79.2
41.7
83
74
38
78.6
41.1
82
73
37
78.1
40.4
81
72
36
77.5
39.8
80
72
35
77.0
39.1
80
71
34
76.4
38.5
79
70
33
75.8
37.9
78
69
32
75.3
73.2
78
69
31
74.7
36.6
77
67
30
74.2
35.9
67
28
73.1
34.6
66
26
71.9
33.4
77
65
24
70.8
32.1
64
22
69.7
30.8
63
20
29.5
61
18
68.6
28.2
60
16
67.5
27.0
59
14
66.4
25.7
59
12
64.1
24.2
58
10
63.0
23.1
57
8
61.9
21.8
56
6
60.8
20.6
55
4
59.7
19.3
55
2
58.5
18.0
54
00
57.4
16.7
53

Remarks :
a. The above table shows approximate conversions in general use.
b. In testing the hardness of cold-rolled steel, the Rockwell “B” Scale is usually applide.
However the product not exceeding 0.762㎜(0.630 in) in thickness require the use of the Rockwell “F” Scale or Rockwell superficial Hardness 30-T.
c. Various Hardness Scale.

Hardness Penetrator Major Load (㎏)
ROCKWELL HARDNESS B
1/16-in, Steel Ball
100
ROCKWELL HARDNESS F
1/16-in, Steel Ball
60
ROCKWELL HARDNESS
Superficial 30T
1/16-in, Steel Ball
30
VICKERS HARDNESS
Diamond Brale With An Angle 136 Degree
5 ~ 50
BRINELL HARDNESS
10m/m Steel Ball
500

Comparative Table of Gauges

 
Gauge U.S.G B.W.G B.G S.W.G M.S.G G.S.G
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
10
3.572
0.1406
3.40
0.134
3.175
0.1250
3.215
0.218
3.146
0.1345
-
-
11
3.175
0.1250
3.05
0.120
2.827
0.1113
2.946
0.116
3.037
0.1196
-
-
12
2.778
0.1094
2.77
0.109
2.517
0.0991
2.64
0.104
2.657
0.1046
2.753
0.1084
13
2.381
0.0938
2.41
0.095
2.240
0.0882
2.34
0.092
2.278
0.0897
2.372
0.0934
14
1.984
0.0781
2.11
0.083
1.994
0.0785
2.03
0.080
1.897
0.0747
1.994
0.0785
15
1.786
0.0703
1.83
0.072
1.775
0.0699
1.83
0.072
1.709
0.0673
1.803
0.0710
16
1.588
0.0625
1.65
0.065
1.588
0.0625
1.63
0.064
1.159
0.0598
1.613
0.0635
17
1.429
0.0563
1.47
0.058
1.412
0.0556
1.42
0.056
1.367
0.0538
1.461
0.0575
18
1.2700
0.0500
1.24
0.049
1.257
0.0495
1.22
0.048
1.214
0.0478
1.311
0.0516
19
1.1113
0.0438
1.07
0.042
1.118
0.0440
1.02
0.040
1.062
0.0418
1.158
0.0456
20
0.0525
0.0375
0.89
0.035
0.996
0.0392
0.91
0.036
0.912
0.0359
0.006
0.0396
21
0.8731
0.0344
0.81
0.032
0.886
0.0349
0.81
0.032
0.836
0.0329
0.930
0.0366
22
0.7938
0.0313
0.71
0.028
0.794
0.0313
0.71
0.028
0.760
0.0299
0.853
0.0336
23
0.7144
0.0281
0.64
0.025
0.707
0.0278
0.61
0.024
0.683
0.0269
0.777
0.0306
24
0.6350
0.0250
0.56
0.022
0.629
0.0248
0.56
0.022
0.607
0.0239
0.701
0.0276
25
0.5556
0.0219
0.51
0.020
0.560
0.0220
0.51
0.20
0.531
0.209
0.627
0.0247
26
0.4763
0.0188
0.46
0.018
0.498
0.0196
0.46
0.018
0.455
0.0179
0.551
0.0217
27
0.4366
0.0172
0.41
0.016
0.443
0.0175
0.417
0.0164
0.417
0.0164
0.513
0.0202
28
0.3969
0.0156
0.36
0.014
0.397
0.0156
0.376
0.0148
0.378
0.0149
0.475
0.0187
29
0.3572
0.0141
0.33
0.013
0.353
0.0139
0.345
0.0136
0.343
0.0135
0.437
0.0172
30
0.3175
0.0125
0.30
0.012
0.312
0.0123
0.315
0.0124
0.305
0.0120
0.399
0.0157
31
0.2778
0.0109
0.25
0.011
0.279
0.0110
0.295
0.0116
0.267
0.0105
0.361
0.0142
32
0.2580
0.0102
0.23
0.009
0.249
0.0098
0.274
0.0108
0.246
0.0097
0.340
0.0134
33
0.2381
0.0094
0.20
0.008
0.221
0.0087
0.254
0.0100
0.229
0.0090
-
-
34
0.2183
0.0086
0.18
0.007
0.196
0.0077
0.234
0.0092
0.208
0.0082
-
-
35
0.1984
0.0078
0.13
0.005
0.175
0.0069
0.213
0.0084
0.191
0.0075
-
-

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