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The ability to recrystallize the metal at high temperature used in hot working. 2. Recrystallization - is the growth of new, strain-free grains. 3. During the heat treatment the metal may be exposed to very high plastic strain ratio. 4. The cold treatment makes the metal harder and more durable, but some metals have a limit of deformation. 5. Steel sheets can be made hot or cold. 6. The surface of the cold rolled sheet is smoother and stronger than he. 7. The cross-section of the die extrusion can be simple or complex. 8. Aluminum and copper alloys are the best for extrusion because of their plasticity when deformed. 9. Aluminum cans, tubes for toothpaste are examples of use extrusion forming. 10. The wall thickness of the aluminum cans defined gap between the punches and dies.
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