Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Annealing with lead - process?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Loner" data-source="post: 406822" data-attributes="member: 24560"><p>I think some reading needs to be done. 650 Degrees for a few seconds will not anneal</p><p>brass. Here's one article but you can find this information all over the net on educational,</p><p>scientific and industrial websites.</p><p></p><p></p><p><a href="http://www.lasc.us/CartridgeCaseAnnealing.htm" target="_blank">Cartridge case annealing. Properties of cartridge cases & factors affecting the annealing process, how & why of brass annealing</a></p><p></p><p>Here is an excerpt. </p><p></p><p></p><p> 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. From this discussion we can see that there are four considerations concerning time and temperature:</p><p></p><p>1> Due to conduction, the amount of heat necessary to sufficiently anneal the case neck is great enough to ruin the rest of the case.</p><p>2> If the case necks are exposed to heat for a sufficient period of time, a lower temperature can be used.</p><p>3> The longer the case necks are exposed to heat, the greater the possibility that too much heat will be conducted into the body and head, thereby ruining the cases.</p><p>4> The higher the temperature, the less time the case necks will be exposed to heat, and there will be insufficient time for heat to be conducted into the body and head.</p><p> You can see that there are a couple of catch-22's involved in this annealing business. On the one hand, the brass conducts heat quite rapidly, and a fairly high temperature with sufficient time must be attained to do the job. On the other hand, too much time cancels the effect, and we will be left with a case that is too soft and not suitable for anything but scrap. Obviously, there must be a solution; otherwise, not even the cartridge manufacturers could get the job done.</p><p></p><p></p><p> If you read the full text on the link you will see his testing method. I just use my calipers and grip them right over the case neck and squeeze the .002 to .003</p><p>and watch my springback. No visegrips used.</p></blockquote><p></p>
[QUOTE="Loner, post: 406822, member: 24560"] I think some reading needs to be done. 650 Degrees for a few seconds will not anneal brass. Here's one article but you can find this information all over the net on educational, scientific and industrial websites. [url=http://www.lasc.us/CartridgeCaseAnnealing.htm]Cartridge case annealing. Properties of cartridge cases & factors affecting the annealing process, how & why of brass annealing[/url] Here is an excerpt. 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. From this discussion we can see that there are four considerations concerning time and temperature: 1> Due to conduction, the amount of heat necessary to sufficiently anneal the case neck is great enough to ruin the rest of the case. 2> If the case necks are exposed to heat for a sufficient period of time, a lower temperature can be used. 3> The longer the case necks are exposed to heat, the greater the possibility that too much heat will be conducted into the body and head, thereby ruining the cases. 4> The higher the temperature, the less time the case necks will be exposed to heat, and there will be insufficient time for heat to be conducted into the body and head. You can see that there are a couple of catch-22's involved in this annealing business. On the one hand, the brass conducts heat quite rapidly, and a fairly high temperature with sufficient time must be attained to do the job. On the other hand, too much time cancels the effect, and we will be left with a case that is too soft and not suitable for anything but scrap. Obviously, there must be a solution; otherwise, not even the cartridge manufacturers could get the job done. If you read the full text on the link you will see his testing method. I just use my calipers and grip them right over the case neck and squeeze the .002 to .003 and watch my springback. No visegrips used. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Annealing with lead - process?
Top