airgasim
+1y
CR is cold rolled -Hr is hot rolled
As far as i know the only difference is the manipulating of the material during form.Meaning Hr steel is heated to a certain temp at the time the pc is measured and then it cools and shrinks,usally in odd shapes(not square).
Cr is at its size under a certain temp and therefor shrinks less and usually has less contaminates and shlag left on it ,even though you should clean it with a solvant first.
Hr is also easier to burn throgh than Cr for some reason!