Erratum to “An analysis of inclusion defects on strip steel surface induced by polyurethane roller [Eng. Failure Anal. 18(3) (2011) 1122–1127]”

In a cold rolling mill, inclusions were inspected on the strip steel surface after multiple cold rolling process in summer season, which caused a large amount of inferior strips. To clarify the reason of the surface defects, experimental research and in situ investigation have been performed. The micro-structure of inclusions was investigated under scanning electron microscope (SEM), and micropits were observed on the strip surface with vermiform particles trapped inside. A large content of carbon was tested in the micro-pit by energy dispersive X-ray analysis (EDAX). Adherents on polyurethane (PU) roller surface and debris in the PU roller bracket were examined by SEM, EDAX and Fourier transform infrared spectroscopy (FTIR) respectively. The vermiform particles were also observed in the SEM analysis of the debris, and the FTIR results of the debris showed good agreement with the PU standard spectrum. It was proved that inclusions were caused by the wear debris from PU roller. Replacing the PU roller in time and enhancing the crystallinity of PU roller were effective methods to eliminate such kind of inclusions.