Elon claims his thick SpaceX alloy can’t be rounded because it is so strong it will break the stamping press.
“Reason Cybertruck is so planar is that you can’t stamp ultra-hard 30X steel, because it breaks the stamping press.” Elon Musk
Stamping engineers disagree.
Sheet metal engineer gives a review on forming stainless steel has described by Elon Musk. Is the exoskeleton of the cybertruck really bulletproof?
stampingsimulation.com
Thus the real question is, will cold-rolled stainless steel with YS = TS = 611 MPa break the stamping press?
Answer: No, assuming the press is correctly sized for the part. The part will fail (split or crack), not the press.
The part cracks or split during the attempted forming operation, because the material that is cold worked to the point of its Tensile Strength, has no ability to stretch or form. If the material is cold rolled or worked to its maximum, any additional cold work (ie: forming in a press) pushes the material past its Tensile limit and it fails (cracks).
Having come from this world years ago, I would guess that it broke the crappy prototype die they built on a tight timeline, and/or the part because he insisted on part geometry that stretched the material too much (think of stamping a three sided box corner from flat sheet).
Elon liked the crayon on paper sketch he made, anyway, and he would never admit his chosen material was failing, so here we are.
In the auto and truck manufacturing world there are some pretty dang hefty pieces and complex geometries stamped.
We had one press nicknamed “The Bump”, that you could feel shake the ground in the parking lot outside the fence on each stroke.