heat treatment of 5.56 cases?

[Dr Bocci 0]

Hey guys this is a newbie question. Can someone tell me why the necks of the 5.56 cartridge of discolored? To me it looks heat treated. If so why? And why not on.223?

[Socom 19]

They are annealed, it's a heat treatment to make it more ductile workable

[matty 810]

You mean annealing? Some 5.56 are some are not.

 

Hey guys this is a newbie question. Can someone tell me why the necks of the 5.56 cartridge of discolored? To me it looks heat treated. If so why? And why not on.223?

[Dr Bocci 0]

Annealing, check.

 

Now channeling my 3 1/2 yr old: why?

[Shocker 151]

The mil spec on 5.56 requires the discoloration from annealing to be left there. Perhaps someone thought Lake City might skip that step.

 

Most commercial brass makers polish off the annealing marks to make it prettier.

 

You mean annealing? Some 5.56 are some are not.

 

I think ALL cases are annealed, certainly all necked rifle cases. If they weren't you'd have some severe work hardening at the top from the draw forming and they'd probably split.

[Dr Bocci 0]

Ahh, thanks.

[NJKen 23]

Annealing, check.

 

Now channeling my 3 1/2 yr old: why?

Funny thing there, I know all about the annealing process but after the first answer my 3 year olds voice popped in my head with the same "why?"!

Ken