Home Forums General Discussion Shot Peening Process, Intensity, Coverage Shot hardness compared to target hardness

[From unidentified user]
hi,
I try to identify the influence of the difference of hardness between the piece and the shot. In my case there is a big difference: the hardness of the shot is 610HV and the hardness of the piece is 400HV. I ask when the difference is acceptable; I know that the shot should be harder than the piece (no more information about how much).
thanks