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Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process

1
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2
Hormozgan Steel Company (HOSCO), Bandar Abbas, Iran
3
EEMCS Faculty, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 801; https://doi.org/10.3390/met9070801
Received: 7 July 2019 / Revised: 16 July 2019 / Accepted: 19 July 2019 / Published: 20 July 2019
(This article belongs to the Special Issue Rolling of Metals)
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Abstract

This paper investigates the root cause of the formation of surface cracks on hot-rolled C–Mn constructional steel heavy plates. Cracks are rather evenly distributed over the surface in the form of colonies of cracks. Samples were cut from the heavy plate. The microstructure of samples in the as-cast and hot-rolled states were studied using optical and electron microscopes as well as energy dispersive X-ray spectroscopy (EDS). Results show that cracks are heavily oxidized. De-carburized areas are also seen alongside cracks. The crack tip is in the form of a deer-horn, indicating that crack branching has taken place during deformation. The crack initiation sites are V-shaped grooves on the surface of as-cast slabs. Correlations between microstructures, processing parameters, and crack formation are discussed. View Full-Text
Keywords: heavy plates; crack; C–Mn steels; hot rolling heavy plates; crack; C–Mn steels; hot rolling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bahrami, A.; Kiani Khouzani, M.; Mokhtari, S.A.; Zareh, S.; Yazdan Mehr, M. Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process. Metals 2019, 9, 801.

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