Re: annealing: to dunk or not to dunk
Everyone could start their quest to anneal by actually trying to understand the process......via google + "annealing brass" yeilds in .09 seconds 111,000 hits and 8 searches related to "annealing brass". If you can't find an answer to a question in all that info then there just isn't any hope for you.
Fourth down the list is
Annealing (metalurgy) - Wikipedia the free encyclopedia.
The basic truth is we use a brass alloy in our cartridge cases, and everything we do to this brass alloy, from firing it in a firearm's chamber the first time to reseating a new bullet in it, subjects the brass to what we call "work".
Work is any physical force that changes the shape of the brass. Physically changing the shape of the brass changes the internal structure of the brass by inducing internal stresses on the molecular level. These changes in molecular structure reduce the "ductility" of our brass. When the stresses in our cartridge brass reach a critical point we see the results as split necks and shoulders...some of us see it earlier than that in the form of lousy neck tension and a variance from normal "accuracy".
If you go down to "Process Annealing" in the wikipedia article you can read about what what we are doing here with our cartridge brass. There are stages of annealing that go all the way to a "full anneal", which in our case is a piece of brass that is too soft. We are controlling our annealing process to only partially anneal the brass so that the alloy will still retain some of it's hardness properties yet still allow us to work it further without it breaking.
Since it would be dangerous to anneal the entire piece of brass to the level of ductility we require in our case necks and shoulders, we do not heat the entire piece of brass, which is why we just don't stick 'em in a furnace to do it. It's why we take extra pains to just heat the neck or neck/shoulder. It's why some of us take the time/effort to quench the brass after the neck/shoulder reach the right temp.
Since the range of temps for process annealing range from 500 degrees F to 750 degrees F, it is entirely feasable that a partial anneal can happen further down the brass case where we don't want it by migration of the heat after the neck/shoulder is done. Brass is a very good conducter of heat, meaning it heats very quickly, and meaning heat travels very quickly through it. It's my judgement for my process that I simply do not want to take that chance.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Unlike ferrous metals—which must be cooled slowly to anneal—copper, silver[1] and brass can be cooled slowly in air or quickly by quenching in water. In this fashion the metal is softened and prepared for further work such as shaping, stamping, or forming.</div></div>
Since it's okay to do, and since I know it will emmediately stop the heat precisely where I want it stopped, I'll continue to water quench my brass. I'm not shooting your brass so to each his own, and you'll never convince me that quenching is a waste of time/effort.