For a delightful demo of Curie point of steel see:
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I wonder, which steel has the highest energy of recalscence, and does recalescence occur at the Curie point?\
Steel when heated to fully anneal will recalesce (reheat) as it passes through the temperature at which it hardens, releasing the energy, falling to a more ordered state, in which it is more highly internally strained, and therefore harder. I think I got that right. A nail might do it. A sewing needle definitely will; I've done that. I also ruined a good awl trying this. :( Overhardened it, didn't temper it, snapped the tip clean off.
Same with Curie: disordered magnetic domains reform at the Curie temperature as a metal cools, and the metal is "suddenly" (not actually so suddenly, see the video) "a magnet again".
Cheers,
Douglas (Dana) Goncz, CPS Replikon Research Seven Corners, VA 22044-0394