Monday, May 9, 2011

CrazyEngineers Forum - Chemical & Metallurgy Engineering

CrazyEngineers Forum - Chemical & Metallurgy Engineering

Chemical process flow sheets:

Posted: 09 May 2011 12:37 AM PDT

Process description flow sheets are useful for your project report. Process diagram for a chemical plant explain the arrangements of unit operations and unit process.

Ammunition cartrige brass annealing

Posted: 08 May 2011 03:48 PM PDT

May 8, 2011Hello Everyone:

I'm not an engineer. But I am always interested in the science behind things. I'm an avid reloader of ammunition and work with brass cases alot. Today an issue came up where this person presented his friend's process for annealing brass:

Very, very, very unusual annealing method - THR

For those of you who don't enjoy this hobby, we anneal brass to remove the effects of work hardening to make it last longer. When a cartrige is fired, it expands to seal the firearm chamber. When we reload it, we squeeze the case back to size by running it through a series of dies. This work hardens the brass and it eventually splits. When we anneal the case, we heat the bullet end of an empty case untill it glows in hopes of softening it. We do not heat the whole case because we want the bottom of the case hard in odrer to preserve it's strength.

In the above thread, the gentleman heats the whole case until it glows, then quenches it in used motor oil. He does this twice. Being you are the masters of metal, could you explain what is happening to the brass?

Thanks,

-918v
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