Annealing of brass or brass alloys is done by carefully heating it "cherry red" and plunging it into cold water rapidly.
Because the brass is an alloy of Copper, and copper work-hardens, the annealing of brass and brass alloys works OK.
If you further work the brass/brass alloy, you may need to reheat and plunge dip, to anneal for further working of the metal mechanically.
This process is commonly used for the production of rifle cartridge
cases, brass musical instruments, and other brass objects which require
much mechanical work during their manufacture.
Brass and copper objects get "work-hardened", which is why they need
to be annealed, sometimes several times, to prevent fractures occurring
during the manufacturing process.
Be warned, however, that brass and brass alloys have recently been developed, which are "anneal-resistant", and they cannot be annealed in the simple heat and quench manner, as described above.
Kind Regards....
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