Former Press Brake Operator here.
Sometimes they cannot. Certain steels Ike what are used for armor plating are just too tough. Other mild steels are nice and soft. So malleable, you can smoosh them like cookie dough. Diamond plate for example, is made of mild steel, and is designed to be smooshed into dumb shapes for worker’s safety boxes and baskets. That tough stuff that is literally bullet proof is just too strong to bend, without heating it 1000° and killing what it was meant for.
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