The alloy of aluminum I commonly everywhere in all kinds of shapes and sizes is 6061-T6. Good corrosion resistance, easy to machine, but it's not very flexible when forming anything much larger than sheet thickness. Sucks because I need a piece of bar stock I can cold work to replace a piece of trim and 6061-T6 won't do, though -0 would probably be good, I can't even find that for a reasonable price or in the right size.
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