What is it?

This cold-roll defect looks like some material was gouged out, and then rolled into the surface of the coil. It is typically 0.25”-2” in length. It can also be known as laminations, scratches, or pits. This defect is caused by the coil’s head or tail-end striking something while the coil is being charged or discharged on the reversing mill, gouging out a portion of the surface. The tail following the gouge is associated with the gouged material being pulled along the surface.

Friction Gouge (Longitudinal direction

Friction Gouge (Longitudinal direction