Recrystallisation
The change in crystal structure of a cold worked metal that occurs when heated through a specific temperature range.
Rolled-in Scale
A surface defect caused by patches of scale that were pressed into the surface of the work-piece during rolling.
Roller Levelling
The process of flattening sheet metal by passing it through a roll train of staggered rolls. Levelling is achieved by precisely bending metal strip back and forth as it is passed through a the series of small-diameter offset rolls.