Spalling Failure Analysis and Improvement of Work Roll for Cold Strip Mill

Through accident investigation and analysis on fracture characteristics of work roll,spalling from barrel internal thread-like crack was found.Samples were then taken for examination on chemical analysis,microstructure,micro hardness,micro-fracture on those spalled work rolls.The examination demonstrates that the spalling was mainly caused by disagreement of barrel surface with technological requirements,and higher micro-hardness,higher residual austenite amount.Some improvements were made and no spalling has occurred ever since.