A roll scratch is a straight deepening which is going in
lengthways direction to the wire rod. The form of a roll scratch can be broad with
low depth or also pointed with a greater depth. The defect arises if the rolling
piece drags at leaderships or at other rolling accessories. Roll scratches, which
are available at the pre-material (billet), can lead to a pincher when rolling
further to the ready profile. The defect on hand is a roll scratch which has arisen
during rolling to the round profile.
19,50 mm round - quenched and tempered