Cut a straight piece of metal coat hanger, about 10 inches long. Bend it back and forth a few times. The point where the bend is will now be work hardened.
*If you repeat this bending too many times, it will break because the hardening also makes it brittle.
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332322 (Sheet Metal Work Manufacturing) is the coding.
Brittle
Welding
They should not be cleaned in the kitchen sink and YES, it will harden in the drain.
Vulcanisation.