I have a requriement for maximum hardness of cold formed aisi 1010 rivets to be 60 HRB. Many of these rivets are very small, 0.020" diameter and 0.125" long. I am not able to consistenly get them to a hardness below 60 HRB.
I have looked at mateiral chemistry variation, tried various cooling cycles/time in my anneal process, and still not consistent success.
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