It's not my theory of time. It is the copper Institute of America's table for annealing of 70/30 brass. But you are right the entire thickness needs to be brought to temperature, it just is not as slow as what you are making it out to be.
Brass (70/30) has a thermal conductivity of around 120, in comparison the thermal conductivity of water is about .598, air is .024 and silver is 419. 60/40 brass is about 96 because of the difference of the alloy. Your cake batter analogy would be a slurry of water and solids with gas bubbles being formed as it bakes so I would guess the TC would probably be around .3 - .5. Just guessing but it would be very low regardless.
edit - if you want to cut down the time to bake a potato take a aluminum rod and insert it into the potato to transfer heat and bake the potato from the outside in and from the inside out at the same time
Bottom line is heat is transferred very quickly throughout a piece of brass. Not as fast as silver, gold, or aluminum but PDQ. Thankfully for our purpose a full anneal is not needed, some stress relief is sufficient.
If you want more of a anneal a flash anneal can be provided by a AMP because it is able to time the anneal down to the millisecond and uses a tightly focused magnetic field to do so. Something that cannot be accomplished with flame. The AMP's Aztec software takes the test case up to the melting point to determine how much energy needs to transfer to heat the mass and alloy of the case being tested to achieve a flash anneal of the neck/shoulder. The test case is unusable after the test but then you can dial in the number provided for future anneals of that brand and lot number afterwards.
I have not noticed any difference either in chronograph numbers, accuracy or case life since switching to the AMP from my Annealeez so for me I don't find the "perfect" anneal really worth the money from that standpoint. It is however fast and convenient and I have no plans to sell mine.
edited at 6 PM EST to make it a bit more readable
Brass (70/30) has a thermal conductivity of around 120, in comparison the thermal conductivity of water is about .598, air is .024 and silver is 419. 60/40 brass is about 96 because of the difference of the alloy. Your cake batter analogy would be a slurry of water and solids with gas bubbles being formed as it bakes so I would guess the TC would probably be around .3 - .5. Just guessing but it would be very low regardless.
edit - if you want to cut down the time to bake a potato take a aluminum rod and insert it into the potato to transfer heat and bake the potato from the outside in and from the inside out at the same time
Bottom line is heat is transferred very quickly throughout a piece of brass. Not as fast as silver, gold, or aluminum but PDQ. Thankfully for our purpose a full anneal is not needed, some stress relief is sufficient.
If you want more of a anneal a flash anneal can be provided by a AMP because it is able to time the anneal down to the millisecond and uses a tightly focused magnetic field to do so. Something that cannot be accomplished with flame. The AMP's Aztec software takes the test case up to the melting point to determine how much energy needs to transfer to heat the mass and alloy of the case being tested to achieve a flash anneal of the neck/shoulder. The test case is unusable after the test but then you can dial in the number provided for future anneals of that brand and lot number afterwards.
I have not noticed any difference either in chronograph numbers, accuracy or case life since switching to the AMP from my Annealeez so for me I don't find the "perfect" anneal really worth the money from that standpoint. It is however fast and convenient and I have no plans to sell mine.
edited at 6 PM EST to make it a bit more readable
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