i have a half dozen medical home care oxygen tanks that are alum in color with green top section. . . for obvious reasons. they are scrap so i have attempted to cut them into smaller pieces so they will fit in my crucible for melting. they are about 4 inches in diameter with approx. 1/4" wall thickness.
very forgiving when i try to flatten the rings i have cut. . . and they don't break or even crack when squeezed down in 180 degrees tight bend. . .
what grade would any of you knowledgable guys think this stuff may be ?