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Rifles, Reloading, Optics, Equipment
Reloading
annealing brass
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<blockquote data-quote="Timber338" data-source="post: 1182473" data-attributes="member: 33822"><p>Mikecr, sounds like you've got the lead dip method down. I made my own torch-based annealing machine and it is working well. Have you found any technical data to back up the temperature you set your lead to? I have only started to research temperatures and have not found anything very compelling yet. Recrystallization temperatures starting in the mid 500 range for typical cartridge brass alloys is all I've found using sources like Matweb and a few other research papers published by universities.</p><p></p><p>The game is getting the necks to the correct temperature over the correct time without letting the lower half of the case get anywhere near 500 degrees. </p><p></p><p>Right now I'm using 750 Tempilaq inside the necks with a stripe of 450 Tempilaq down the entire length of the brass. This way I get my necks up to a high enough temp and guaranteeing that I protect the rest of the brass. </p><p></p><p>Here is a picture of a few brass each held in the torch about .5 seconds longer starting around 4.5 seconds on the left. </p><p></p><p>I can see how a lead dip would have advantages of localized instant heat. Probably a more consistent method with proper controls in place. I would love to see the process that Lapua uses to anneal their brass.</p></blockquote><p></p>
[QUOTE="Timber338, post: 1182473, member: 33822"] Mikecr, sounds like you've got the lead dip method down. I made my own torch-based annealing machine and it is working well. Have you found any technical data to back up the temperature you set your lead to? I have only started to research temperatures and have not found anything very compelling yet. Recrystallization temperatures starting in the mid 500 range for typical cartridge brass alloys is all I've found using sources like Matweb and a few other research papers published by universities. The game is getting the necks to the correct temperature over the correct time without letting the lower half of the case get anywhere near 500 degrees. Right now I'm using 750 Tempilaq inside the necks with a stripe of 450 Tempilaq down the entire length of the brass. This way I get my necks up to a high enough temp and guaranteeing that I protect the rest of the brass. Here is a picture of a few brass each held in the torch about .5 seconds longer starting around 4.5 seconds on the left. I can see how a lead dip would have advantages of localized instant heat. Probably a more consistent method with proper controls in place. I would love to see the process that Lapua uses to anneal their brass. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
annealing brass
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