Re: Which annealing machine
Please excuse me <span style="font-weight: bold">EWP</span> if you are Ken Light or Jim Harris on that keyboard,
<span style="font-style: italic">if NOT</span>, you should really give them the credit for what you typed. I recognized it immediately from the 6mmbr.com web article they wrote.
http://www.6mmbr.com/annealing.html
I'm really not trying to stir the pot and get off topic, it's is just kind of an <span style="font-style: italic">etiquette</span> thing.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: EWP</div><div class="ubbcode-body">The critical time and temperature at which the grain structure reforms into something suitable for case necks is 662 degrees (F) for some 15 minutes. A higher temperature, say from 750 to 800 degrees, will do the same job in a few seconds. If brass is allowed to reach temperatures higher than this (regardless of the time), it will be made irretrievably and irrevocably too soft.
Brass will begin to glow a faint orange at about 950 degrees (F). Even if the heating is stopped at a couple of hundred degrees below this temperature, the damage has been done--it will be too soft.
Over-annealing is certainly the worst condition, and can even be dangerous, as pointed out above. Over-annealing has two aspects: over-annealing of the case neck only, and any annealing of the lower half of the case. There is no particular danger to over-annealing the case necks, which is the usual result of standing the brass in water and heating the necks with a torch or any process where the neck glows orange. All that will happen is that your accuracy will not improve, or it may become worse, and the cases may seem to be a little more sticky during extraction. Case life will be improved because the necks are soft--too soft.
Any annealing whatsoever of the cartridge base is over-annealing and is dangerous. This area of the brass must retain the properties it had when it left the factory. If it is made the least bit softer, let alone "dead" soft, the stage is set for another shooter's nightmare. At the very least, you may get a whiff of hot gas directed toward your face. At the worst, you can be seriously injured as your gun behaves more like a hand grenade than a firearm.
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