Hot Rolled Carbon & Micro-Alloy Steel Plate Surface Bracking Near Roleld Edges

I am not a professional in steel rolling but I try to give you a logical answer.

Question: why a steel piece can crack when deformed ?

Answer: when its deformation leads to strains over the acceptable plasticity limit without cracks.

Question: what influences this limit ?

Answer: the steel piece temperature there where the cracks appear: it is too low!

Question: what shall I do to avoid cracks ?

Answer: keep temperature high enough to have a plasticity limit high enough.

Question: why do the cracks appear at the corners or near to?

Answer: because corners are cooled on 2 sides - air on side and roll on the top or bottom being cooled more than the middle or the core their plasticity limit is lower thus the cracks. When passing between the rolls the metal is stressed in 2 directions axial and transverse depending which one is more important the cracks can have different directions normal to the flow lines.

I do not know if this is the real reason but qualitatively it seems to be logical.

This does not mean you should avoid to contact "professionals", if you do please inform me if my reasoning is correct or has flaws, I would appreciate.