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metrat (Materials) (OP)
26 Feb 03 12:04
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.

Any suggestions????

Thanks.
Metalguy (Materials)
26 Feb 03 12:54
I had forgotten this in an earlier post for a similar question, but long exposure to around 1250 deg. F (spherodizing or spherodize-annealing) will give you the softest rivets.
TVP (Materials)
1 Mar 03 14:42
As Metalguy stated, spheroidizing treatments produce very low hardness.  For general information on spheroidizing, read the description I posted in the following thread:

Thread330-42174

For SAE 1010, proper spheroidizing produces a tensile strength of around 300 MPa, which is low 50's HRB or around 90 HB.  I would investigate the temperature uniformity of your furnace, and the duration of the annealing/spheroidizing cycle.  Depending on the degree of cold working involved in forming the rivet, spheroidizing of a low carbon steel like SAE 1010 should not require a cycle as high I mentioned in the above thread.  700 C for only a couple of hours may be sufficient to produce a spheroidized structure.  Can you provide details on the time and temperature settings you have used so far?

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