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Over annealing cartridge brass
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<blockquote data-quote="adrexco" data-source="post: 1195997" data-attributes="member: 88101"><p>Back in the 70's in high school metal shop we did the brass hardening and annealing work shop. We work hardened the brass by bending. If you bent too much it fractured. Once work hardened we heated until glowing bright. One sample set was allowed to air cool, a second oil bath cool, and a third water bath cool. As you can imagine each sample set had a different hardness. Air cooled was ductile, oil cooled was moderate, water cooled was hard. My point here is annealing is the controlled cooling to create a target hardness. It's not so related to how hot the start temperature is (with reason, you can't melt it). It would be interesting to see what hardness new brass is, verses air cooled, oil cooled, or water cooled. Anyone have access to a brinell hardness tester?</p></blockquote><p></p>
[QUOTE="adrexco, post: 1195997, member: 88101"] Back in the 70's in high school metal shop we did the brass hardening and annealing work shop. We work hardened the brass by bending. If you bent too much it fractured. Once work hardened we heated until glowing bright. One sample set was allowed to air cool, a second oil bath cool, and a third water bath cool. As you can imagine each sample set had a different hardness. Air cooled was ductile, oil cooled was moderate, water cooled was hard. My point here is annealing is the controlled cooling to create a target hardness. It's not so related to how hot the start temperature is (with reason, you can't melt it). It would be interesting to see what hardness new brass is, verses air cooled, oil cooled, or water cooled. Anyone have access to a brinell hardness tester? [/QUOTE]
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