What you are looking for as you apply the flame of your blow lamp torch onto the part to be annealed is the tell tale colors again.
Annealing brass sheet metal.
How to anneal brass.
Hello i have a piece of brass sheet cu 60 zn 40 15cm x 8 cm x 4mm thick.
When the brass starts to show a blackened color then is the time to quench it quickly before.
Annealing is a heat treatment process in which the sheet metal is altered on a molecular level altering its strength and hardness.
It it possible to anneal it to get e a very soft malleable sheet.
The metal is heated above its recrystallization temperature maintained at this temperature and then cooled in a controlled environment.
The inside of the oven must be large enough to allow air to circulate around the piece of metal.
For large pieces gas fired conveyor furnaces are used while car bottom furnaces are more practical for smaller pieces of metal.
During the annealing process the metal is heated to a specific temperature where recrystallization can occur.
Annealing brass is very similar to copper although the temperature should be a little cooler.