HRC = Hardness, Rockwell C Scale
Diameter
% Cold-Worked
Yield Strength (ksi)
Hardness (HRC)
1" Below Surface
Mid-Radius
7.5
50
185.5
180.3
-
8
175.4
8.25
40
168.1
166.2
38.6
36.1
10
30
162.3
149.8
40.0
35.0
HRC= Hardness Rockwell "C"