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+--- Thread: What happens if you anneal the same case twice? (/showthread.php?tid=24527)
What happens if you anneal the same case twice? - Zeneffect - 05-10-2022
Ive wondered what happens, you have wondered...
https://www.youtube.com/watch?v=D_aukSJwUXA
AMP answers that question. Enjoy!
my takeaway is.. when annealing using a semi-automated method you can safely drink to a solid buzz without risk of borking the brass.
TL/DR - does nothing at all. Perfectly safe to lose your count and run a piece twice.
What happens if you anneal the same case twice? - grayfox - 05-11-2022
Did not watch the vid, but from a metallurgical standpoint, assuming you did the same operation exactly, twice, a proper anneal would not change if done twice. More time on one run vs less time, or higher/lower temp vs the other, would be a different story.
What happens if you anneal the same case twice? - Zeneffect - 05-12-2022
i am not a metalurgist by any means and but a simple and slow man... that knows how to break things. What I would like to see is the effect of hardness at the base and down the body if you run it through the cycle, then run it immediately through the cycle again allowing heat soak to actually occur. how idiot proof is it? how many times can you do this in a row before the brass is ruined?
What happens if you anneal the same case twice? - grayfox - 05-12-2022
Metals are big in the nuke industry...
Letting the heat "soak" down the case sends the annealing effect down where it's not supposed to go. Annealing softens the brass by removing the work hardening done to it by the resizing. So if you soften the rest of the case body or down to the base, some kind of problem will crop up, whether a buckling during resizing, or a kaboom b/c it can't handle the pressures right, or something...
What happens if you anneal the same case twice? - Fess - 05-12-2022
Zeneffect Wrote:i am not a metalurgist by any means and but a simple and slow man... that knows how to break things. What I would like to see is the effect of hardness at the base and down the body if you run it through the cycle, then run it immediately through the cycle again allowing heat soak to actually occur. how idiot proof is it? how many times can you do this in a row before the brass is ruined?
Even if you waited only a minute or so between repeated heatings, it would take quite a few repetitions to significantly change the properties of the brass near the base. The brass must reach at least 482°F (250C) to even begin annealing, according to a couple of articles I saw. The process is pretty slow even at 600°F and would take minutes to have much effect. Just make sure that the heat is applied mostly to the neck and shoulder junction instead of the case body. As soon as the source of heat is removed, not only does the heat energy rapidly disperse throughout the the remaining 70% or so of the mass of the case, the entire case begins to reject the heat to the environment. You would have to really, really screw up to get the case walls near the base to over 600°F. I'm not saying that it couldn't be done, but....*
If you are dealing with a bunch of brass that has completely cooled, the only sections of the case that could have an issue with "heat soak" would be those that get well over 500°F. This is comforting to me since I remember that I annealed some of my 30-30 brass several years ago.... but I don't remember WHICH batch.
* Note: I learned that nothing is idiot-proof if you have some really determined idiots.
What happens if you anneal the same case twice? - RMiller - 05-20-2022
I thought the video was worth the watch.