A cylindric shape steel sample was tested by Rockwell hardness test and showed a hardness value 80 HRB. The diameter of the steel cylinder is 16mm. What is the true hardness value of this steel sample?

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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A cylindric shape steel sample was tested by Rockwell hardness test and showed a hardness value 80 HRB. The diameter of the steel cylinder is 16mm. What is the true hardness value of this steel sample?
Scales B, F, G
1/16 in Ball Indenter
Diameter of Specimen - inches (mm)
Observed
1/8
14
3/8
3/4
1/8
1-1/4 1-1/2
1/2
(13) (16) (19) (22)
5/8
Reading (3.2) (6.4) (10)
(25)
(32) (38)
2.5
1.5
3.0
2.0
3.5 2.5
1.0
1.5
1.5
05
1.0
1.5
NA
3.5
4.0
5.0
1.0
1.5
1.5
NA
100
90
80
NA
15
1.5
2.0
70
6.0
7.0
8.0
4.0
5.0
5.5
3.0
2.5
60
50
3.5
4.0
3.0
3.5
2.0
2.5
3.0
2.0
2.0
2.5
1.5
2.0
2.0
6.0
6.5
7.5
40
9.0
4.6
4.0
3.0
2.5
2.5
10.0
11.0
5.0
5.5
4.5
4.5
3.5
4.0
3.0
3.5
2.5
3.0
10
12.0
12.5
8.0
8.5
6.0
6.5
5.0
5.5
4.0
4.5
3.5
3.5
3.0
3.0
A. 82 HRB
B. 78 HRB
C. 160 HRB
D. 80 HRB
Transcribed Image Text:A cylindric shape steel sample was tested by Rockwell hardness test and showed a hardness value 80 HRB. The diameter of the steel cylinder is 16mm. What is the true hardness value of this steel sample? Scales B, F, G 1/16 in Ball Indenter Diameter of Specimen - inches (mm) Observed 1/8 14 3/8 3/4 1/8 1-1/4 1-1/2 1/2 (13) (16) (19) (22) 5/8 Reading (3.2) (6.4) (10) (25) (32) (38) 2.5 1.5 3.0 2.0 3.5 2.5 1.0 1.5 1.5 05 1.0 1.5 NA 3.5 4.0 5.0 1.0 1.5 1.5 NA 100 90 80 NA 15 1.5 2.0 70 6.0 7.0 8.0 4.0 5.0 5.5 3.0 2.5 60 50 3.5 4.0 3.0 3.5 2.0 2.5 3.0 2.0 2.0 2.5 1.5 2.0 2.0 6.0 6.5 7.5 40 9.0 4.6 4.0 3.0 2.5 2.5 10.0 11.0 5.0 5.5 4.5 4.5 3.5 4.0 3.0 3.5 2.5 3.0 10 12.0 12.5 8.0 8.5 6.0 6.5 5.0 5.5 4.0 4.5 3.5 3.5 3.0 3.0 A. 82 HRB B. 78 HRB C. 160 HRB D. 80 HRB
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