When To/How To Straighten Blades?

[P.Brewster]

I know cold rolled (usually CRA... colled rolled and annealed) has stress in the surface from the rolling. Like a machinist would take off 0.060" So the piece wouldn't get pulled into not-flat, not-square by the residual stress.

Right - when I say I "cold rolled" the bars, I mean I flattened them in a little roller (intended to form sheet into curves, loops, tubes etc), not a dimensional roller.

A lot of steels call for a stress relieve after machining (grinding), too. I really don't know why the water jet process would trigger the steel's memory.

It happens all time on the WJ or laser; usually it happens more with cold-rolled bars than hot-rolled.