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Royster
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| Posted: November 03 2009 at 12:58pm | IP Logged
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I remember inquiring why military brass sometimes is discolored at the shoulders & neck, as if "scorched". I was told that it is a heat treatment process that alighns the atoms of the metal so that there is an equal grip around the bullet, so that the neck of the casing liberates the bullet evenly so as to not misalighn the bullet as it is sent on it's way down the barrel.
I've noticed that some competition shooters will set their casings in a pan of water, allowing the water to fill the casings, and use a propane torch to heat the neck & shoulders of the casings.
* Do you heat treat your casings?
* For you metallurgists, what happens to the metal when this is done?
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wheezengeezer
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| Posted: November 03 2009 at 1:15pm | IP Logged
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Its called annealing.The purpose is to keep the brass from splitting.Brass work hardens.
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lovesrugers
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| Posted: November 03 2009 at 1:17pm | IP Logged
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Royster the process you are talking about is called annealing. What it does is soften the brass. This allows it to be more easily shaped, formed and increases the case life. In general rifle brass is very hard which is a good thing for withstanding the pressures of firing. This allows the brass to expand and then spring back. Of course this hardness is a bad thing up around the case mouth. Hard brass is not easily worked and will often split or crack if over worked. In order to prevent this from happening you need to soften the case neck by annealing. You only want to do this to the neck area because a soft case down further is not good for repeatedly handling high pressures because it loses its spring back capability. You will sometimes see the effects of annealing on factory new brass because the factory does this to ease forming the shoulder and neck.
Jerry
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papabear47
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| Posted: November 19 2009 at 10:02am | IP Logged
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I do it before I reform cases to a different caliber.Such as a 30-06 into 7.65X54,7.7 Jap,8X57 JS....It certainly makes the forming process easier and more uniform
Bill
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Handloads.Com Forum : Precision Shooting
Topic: Heat Treat Casing Necks?
