INFLUENCE OF ROLL WEAR IN HOT ROLLING OF STEEL AT HOT STRIP MILLS

The paper reviews adverse effect of roll wear on performance of the HSM. Factors responsible for higher wear rate of rolls have been studied. Some of the cases have been discussed to show influence of roll wear on HSM parameters like campaign size of rolling, specific roll consumption, profile and surface quality of HR coils, etc. It has been demonstrated that rate of roll wear accelerates after reaching a critical production level. At higher campaign size of rolling, having severely worn rolls, strip profile gets distorted and some of the surface defects like rolled-in-scale and ridge in the rolled products may get generated. Undoubtedly, roll consumption increases with increase in roll wear and at lower campaign size of rolls.