[Piotrsko]

All metal work hardens when forming, tearing is caused by thinning below the tensile strength needed during the forming or granular formation. Annealing stops the granularity and makes the metal more plastic again.

At McStarlite, we baked our aluminum at 350 between passes in the press which should have been an ageing temp but it worked.

Stamp forming is kinda violent and doesn't allow the metal to flow thicker which is why there are ripples along the flanves. Tonnage is just the power required to move that metal. On a couple of square ft you can get to 100 tons required really fast.