Annealing my own brass,... look ok?

[Richard Coody]

did you use tempilaq?

if not you are just guessing

this is what gives annealing a bad name. overannealed? under annealed? inconsistent?

 

[Webster]

I would love to read that data

My annealing at my work place above chart.



I assume that if you had 28.0% reduction a neck would have to elongate about 28%. Based on that I think the about 5.3% chart or perhaps the 10.0% chart would be appropriate. The charts come from the Metallurgy Dept. at the University of Illinois. Note that each box is 2 charts: grain size vs temp and time and hardness VS temp and time.If you look at the 5.3% deformation chart for 400 & 450C 15 seconds there is only a slight drop in hardness. They had to go to 550C for over an hour to see the GS getting bigger.

 

[jepp2]

did you use tempilaq?

if not you are just guessing

Truer words were never spoken!

 

[riflewoman]

Webster: these graphs indicate that softening (annealing ) at 21-28 % CW does seem to be quick at 600C-700C. In a few seconds the HR drops to 80-85 “H” scale which correlated to about 20 “B” scale. Pretty soft. The grain diameter seems to start growing in a few seconds at 700C.

As for reaching 28% cold work, somewhere I did a “back of the envelope” accumulation for a 223. It was between 12 and 14 % accumulated cold work per firing cycle. Repeat 3 times and you’re at 45% accumulated CW.

Found it.

CW

,ID as fired, ID sized No exp, ID after Exp, Firing, Sizing, Expanding, Total CW per cycle, cycles to get 50% CW, cycles to get 40% CW
Make 1, 0.228, 0.213, 0.221, 0.031674,0.065789, 0.037559, 13.5%, 3.7, 3.0
Make 2, 0.231, 0.216, 0.221, 0.045249, 0.064935, 0.023148, 13.3%, 3.8, 3.0

In this table, (it might need to be reformatted) I attempted to see how much cold work was in a typical firing reloading cycle. It isn't too severe ,maybe 14% per cycle. This means that you need 3 cycles to get 40% cold work where annealing seems to have some effect.

Where the CW is defined as (Big Dia-Small Dia)/Starting Dia (Starting dia isthe dia large or small prior to the transformation).

 

[Webster]

Webster: these graphs indicate that softening (annealing ) at 21-28 % CW does seem to be quick at 600C-700C. In a few seconds the HR drops to 80-85 “H” scale which correlated to about 20 “B” scale. Pretty soft. The grain diameter seems to start growing in a few seconds at 700C.

As for reaching 28% cold work, somewhere I did a “back of the envelope” accumulation for a 223. It was between 12 and 14 % accumulated cold work per firing cycle. Repeat 3 times and you’re at 45% accumulated CW.

Found it.

CW

,ID as fired, ID sized No exp, ID after Exp, Firing, Sizing, Expanding, Total CW per cycle, cycles to get 50% CW, cycles to get 40% CW
Make 1, 0.228, 0.213, 0.221, 0.031674,0.065789, 0.037559, 13.5%, 3.7, 3.0
Make 2, 0.231, 0.216, 0.221, 0.045249, 0.064935, 0.023148, 13.3%, 3.8, 3.0

In this table, (it might need to be reformatted) I attempted to see how much cold work was in a typical firing reloading cycle. It isn't too severe ,maybe 14% per cycle. This means that you need 3 cycles to get 40% cold work where annealing seems to have some effect.

Where the CW is defined as (Big Dia-Small Dia)/Starting Dia (Starting dia isthe dia large or small prior to the transformation).

700C = 1292F. I think 99% of us are doing just fine annealing. It's not really complicated.

 

[rsbhunter]

Not earth shaking news, but, I found that the silicone bread/baking pans make great annealed case catchers, if needed aim a small fan into it.....learned about microfiber , cotton, etc cooling platforms, the hard way..just an fyi.....Rsbhunter