Stress Relief Annealing cartridge brass

[Daryll]

Thanks Alan... good to know i won't have to splash out on a load of new cases...!!

I made the machine as a project while I was off over Christmas, based on the designs here:
DIY Annealing Machine - Page 14 - AR15.COM

Some of them look a lot nicer than mine..!!

Regards,

Daryll.

 

[Alantoo]

Cleaning is in an untrasonic cleaner, using an additive specifically for brass... I use that for all my rifle brass with no previous problems...

Did you by any chance run the U/S cleaner for a bit longer or use a slightly stronger mix of the additive (what was the additive by the way?)

The slightly marbled appearance of the post cleaned case necks is perfectly normal when the pickle/tarnish remover has been effectively stopped/delayed/resisted in some areas by the variation in heat scale/tarnish/oxidised layer/sooty deposits from firing and etc.

There is obviously a thicker layer of oxidisation on the body of the case which has built up since it left the factory...that will have been removed and disturbed by gasses from firing and the later annealing...parts with the original oxide layer stayed bright, and the bits with less protection from the sooty deposits were directly in contact with the pickle/additive for longer and so zinc was removed from the surface only. I hasten to add!

Alan

 

[Daryll]

I use this stuff...

Ultrasonic cleaning fluid solution concentrate Brass shell case formula 5lt | eBay UK

APL Ultrasonic cleaning solution 5 litre removes oxidation OUTSTANDING ULTRASONIC CLEANING FLUID DEVELOPED TO COMBINE GREATER CLEANING POWER FOR YOUR SONIC TANK LEAVES A GOOD SHINE ON JEWELLERY- WATCHES-AUTOMOTIVE PARTS-DIVING REGULATORS.

www.ebay.co.uk

They recommend a 10% solution, so I put 300ml in my 3ltr cleaner.

I must admit I normally run cases for 10 mins, (but then sometimes another 10 if they still need it), whereas this time I gave them 15 mins straight off... so not an abnormal amount if time...

Daryll.

 

[Alantoo]

I use this stuff...

Ultrasonic cleaning fluid solution concentrate Brass shell case formula 5lt | eBay UK

APL Ultrasonic cleaning solution 5 litre removes oxidation OUTSTANDING ULTRASONIC CLEANING FLUID DEVELOPED TO COMBINE GREATER CLEANING POWER FOR YOUR SONIC TANK LEAVES A GOOD SHINE ON JEWELLERY- WATCHES-AUTOMOTIVE PARTS-DIVING REGULATORS.

www.ebay.co.uk

They recommend a 10% solution, so I put 300ml in my 3ltr cleaner.

I must admit I normally run cases for 10 mins, (but then sometimes another 10 if they still need it), whereas this time I gave them 15 mins straight off... so not an abnormal amount if time...

Daryll.

Fair enough, I was just trying to account for the difference between your pre-cleaned and post cleaned case appearance. I have had similar variations both on cartridge cases and generally when working with non-ferrous (copper, brasses, silver etc.)

Alan

 

[Totsy]

Excellent thread, thank you Alan and everyone else. Going to try this today.

I’ve found ‘pure soap’ in Aldi.