IngentaConnect Surface inclusions and their evolution on strip rolled on CSP lin...

Authors: Zhu, Y.Z.¹; Rao, J.²; Zhu, Z.²; Xiang, Z.D.²; Wu, Z.F.²

Source: Ironmaking & Steelmaking, Volume 36, Number 7, October 2009 , pp. 548-554(7)

Abstract:

Hot and cold rolled strip samples with surface defects such as black pockmark, sliver and central cracking were collected from a compact strip production line followed by cold rolling. Microstructures and chemical compositions of the strip with defects were studied by scanning electronic microscopy and energy dispersive X-ray spectroscopy. Four typical types of defects on strip including surface spherical mould powder entrapment, centre spherical mould powder entrapment, surface linear mould powder entrapment and centre linear mould powder entrapment were studied by hot and cold rolling experiment in laboratory. It was observed that spherical mould powder entrapment was transformed into the surface black pockmark after the hot rolling and cold rolling process. Centre spherical mould powder entrapment led to central fracture in the hot and cold rolling process. Surface linear mould powder entrapment resulted in sliver and centre linear mould powder entrapment led to severe sliver.

Keywords: CSP; COLD ROLLING; INCLUSIONS; EVOLUTION

Document Type: Research article

DOI: 10.1179/174328109X445723

Affiliations: 1: Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 43008 2: School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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Surface inclusions and their evolution on strip rolled on CSP line and in following cold rolling process