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<p>[QUOTE=&quot;dcarr, post: 2379098, member: 4781&quot;]Typical nails are actually pretty soft and malleable. Notice how they bend fairly easily, but don&#039;t break. It would not be necessary to heat up a nail to strike a coin impression on it. In fact, if you heated up a nail to red hot, and then let it cool in ambient air, it would probably become a little harder.</p><p><br /></p><p>In general, with iron and most steel, if you heat it up and then cool it down very slowly (over many hours), that will anneal (soften it). If you heat it up and cool it fairly quickly, it will become harder. But each successive hardening/softening process will yield diminishing effect.[/QUOTE]</p><p><br /></p>

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