Reply #9: Mild steel can be works cold to some degree... [View All]

[Brother Buzz]

but it too, can become stressed if overworked. You can pound a bolt head (mild steel) with a hammer (hardened carbon steel) and it will easily mushroom, but if you pound it enough it will start to crack and fracture. A tin can lid (mild steel) can be easily bent, but if you bend it enough, back and forth, it ultimately becomes stressed and breaks.

Staples and paper clips are mild steel, think about it.