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<p>[QUOTE=&quot;Hommer, post: 2529674, member: 73266&quot;]Heat is used in the annealing process to expand the molecules and loosen the bonds between them which makes the metal softer and more ductile and malleable. When a coin is struck, the pressure compacts the molecules and in a sense, makes it work hardened. The heat created by the striking is created from friction between the coin and the die and is generated at the surface. This heat is instantaneous and is very quickly absorbed by the coin and die. Though the temperature created at the surface can be and is quite high, when it is absorbed by and distributed by the inner molecules, The temperature of the whole coin rises only a fraction of the original surface temperature. The heat created by striking isn&#039;t enough to anneal the coin again, if it were to do this, the coins would wear and bend or warp much more easily, shortening the life of the coin significantly.[/QUOTE]</p><p><br /></p>

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