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Brass cases far to Imperialist Comrade......what is wrong with steel cases made from the recycled tanks of Facist aggressors???WelshShooter wrote:Soviet propaganda on brass annealing techniques are not welcome in capitalist UK
snayperskaya wrote:Brass cases far to Imperialist Comrade......what is wrong with steel cases made from the recycled tanks of Facist aggressors???WelshShooter wrote:Soviet propaganda on brass annealing techniques are not welcome in capitalist UK
Thanks Phil. To be honest, the cases had been used about 5 times previously and my loads are fairly heavy using 46gr of VN140 with a 200gr FMJ bullet. I think ditching them all makes sense. Good info - much appreciated.hitchphil wrote:Possibly Not.
You have stress relived the case bodies but not annealed them. Annealing i.e. the recrystalisation temperature for 70:30 cartridge brass starts at 450C & is best at nearer 650C, stress relieving starts at 250-350C. The hardness of the case will not have changed by much so the base tensile strength of the metal will have reduced but not by much. The crystallographic structure will not have changed.
The tarnishing is heat oxidation of the copper in the brass its superficial.
got a thermocouple? put it on a case & measure the actual temperature where the cases were? I bet it was lower than 240C (gas ovens tend to be lower esp if its a fan oven) but they tend to over heat first so the profile will be warming up to say 280 then cooling back to 220 for most of the duration of the 25 mins.
..........so my advice would be - make 10 cartridges to 2% below your normal load & test them. (if you get any signs of case body separation ditch them) if they eject OK use them but not with high end match rifle or 1200 yd loads.
Phil
HND Metallurgy, BSc (Hons) Materials Science & Tech :-)
Recycling? Da Tovarisch......steel from Fascist Panzers make many Glorious T-34 of The Motherland, Tovarisch Putin most approving!.WelshShooter wrote:snayperskaya wrote:Brass cases far to Imperialist Comrade......what is wrong with steel cases made from the recycled tanks of Facist aggressors???WelshShooter wrote:Soviet propaganda on brass annealing techniques are not welcome in capitalist UK
I can almost hear Putin saying "Nyet, recycling? This is for sissy boys who like to wear tight fitting jeans."
