From the following figure for steels, please filling blanks: [20 pts]
110
100
90
300
Tensile strength
Rockwell hardness number, HRB or HRC
80
70
60
50
40
30
20
10
HRB
250
200
150
100
50
0
100
200
300
400
500
600
700
800
Brinell hardness number, HB
Approximate tensile strength, s. ksi
(1) Given Brinell hardness HB= 400, it can be converted into HRC = ____ [10 pts]
(2) A near-linear relationship exists between the hardness and the tensile strength.
(a) The HB-Tensile strength relationship: _______________ [10 pts]
[i] HB*0.5 = Tensile strength (ksi)
[ii] Tensile strength (ksi) = 3*HB
[iii] HB/3 = tensile strength (ksi)