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  • The measurement and prediction of surface quality by new developments in EMATS and scarfing and the effect of scarfing on surface defects through the mills


This report details work undertaken to correlate data obtained from inspection systems in the casting plant, scarfing area and rolling mills in order to track product quality throughout the steel mills. The project was a collaboration between Corus UK Teesside Technology Centre (the coordinator), Arcelor and Scuola Superiore Sant' Anna (SSSA). Two main inspection systems were tested for use in the continuous casting plant. The first was conoscopic holography, which was developed from an industrial prototype into a system where the entire slab top and bottom faces were inspected. The second was a hybrid laser-EMAT (electromagnetic acoustic transducer) system and was tested at pilot plant scale. Significant work was conducted to analyse data automatically so that a real-time, online inspection system could be conducted on plant. Slabs were inspected in the slab yard using a variety of techniques which were compared. This inspection work was used to measure how well the caster was performing, by data mining plant signals and, for Arcelor, equating these with the conoscopic holography readings. Slabs were successfully tracked through the steel mill by the partners. Comparisons were made from upstream inspection to the downstream Parsytec system and inspection of the final product. Different scarfing practices were compared and it was found that scarfing was no longer necessary for some steel grades. Metallographic work was undertaken to assess defects in steel samples to determine the cause of cracking. Upon recommendations from this project, plant practices were changed and the defects no longer arose.

Additional information

Authors: BAILLIE I, Corus UK Limited, Cleveland (UK);GRIFFITH P, Corus UK Limited, Cleveland (UK);SMITH A W, Corus UK Limited, Cleveland (UK);MCDONALD M, Corus UK Limited, Cleveland (UK);SANCHO L, Arcelor España S.A., Avilés (ES);DIAZ J, Arcelor España S.A., Avilés (ES);COLLA V, PERCO, Pontedera (IT);SGARBI M, PERCO, Pontedera (IT)
Bibliographic Reference: EUR 23176 EN (2008), 143 pp. Euro: 20
Availability: Katalogue Number: KI-NA-23176-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 978-92-79-07647-3
Record Number: 201010011 / Last updated on: 2010-01-07
Original language: en
Available languages: en