Selection of a Hardness Tester

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(1) Vicker's Hardness Tester (Curve of min.steel sheet by load)

(2) Rockwell Hardness Tester (Measuring condition for proper hardness)


If the crossing of hardness and sheet thickness is on the righe side of the curve, the hardness test may be carried.

The thickness limitation for Hardness testing. (JIS G3311)

Vickers HV
Minimum thicknee(in m/m)
Vickers
Rockwell
load
0.3kg
0.5kg
1kg
5kg
10kg
20kg
Scale B
load 100kgs
Scale C
load 150kgs
350
0.06
0.08
0.11
0.24
0.35
0.49
-
1.40
300
0.07
0.09
0.12
0.26
0.37
0.53
0.51
1.50
250
0.08
0.10
0.13
0.29
0.41
0.58
0.64
1.68
200
0.08
0.11
0.14
0.32
0.46
0.65
0.81
1.83
150
0.10
0.12
0.17
0.37
0.53
0.75
1.14
-
100
0.12
0.15
0.20
0.46
0.64
0.91
1.80
-