Patent ID: 7987719

Claim:
A rolling train having a plurality of rolling stands arranged one behind the other, each rolling stand comprising at least first and second rolls which leave a roll gap having a roll gap width between the first and second rolls, there being associated with each roll of at least one rolling stand a respective ultrasound testing head arranged such that parts of the roll body itself serve as a pass-through distance for the ultrasound waves to pass through to the rolled material to be tested in the roll gap, wherein the rolls provided with the ultrasound testing heads are useable for calibration of the roll gap width, have a straight transverse profile in the region of the roll gap and a diameter which is a multiple of the roll gap width, with the result that a large rolling angle is provided, the rolls provided with the ultrasonic testing heads being arranged in the at least one rolling stand of the rolling train at a location where the forming of the material to be tested is sufficient for resolution of the cast structure and compaction of porosities in the material but stretching of inclusions in the material is still slight.