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Journal of Failure Analysis and Prevention

, Volume 9, Issue 3, pp 275–281 | Cite as

On the Occurrences of “Frizzle-Type” Surface Defects in a Hot-Rolled Steel Plate

  • S. Srikanth
  • Amitava Ray
  • S. K. Chaudhuri
Technical Article---Peer-Reviewed

Abstract

Metallurgical investigations were directed to probe into the genesis of “frizzle” and fissure-type surface defects on 10-mm hot-rolled steel plates meant for application in flat-bed wagons for carrying heavy machinery. The thin hairline fissures on the steel plates were identified as skin laminations associated with long, shallow, and branched cracks, intruding from the plate surfaces to the interior with curved contours, replete with fragmented oxide scale entrapments and debris. The incidence of these superficial defects on the plates was linked to surface damage to the solidifying skin of continuously cast steel slabs, induced by the extensive pitting and cavitation of caster pinch rolls. It is presumed that during hot rolling of the steel slabs, surface blemishes like indentations and folds got rolled over by metal flow, entrapping copious amounts of primary as well as secondary scales underneath the laminated skin. Under the influence of shear forces during rolling, the defects are believed to have ingressed further into the plate interior leading to the formation of long, shallow, and branched cracks with curved contours and entrapped fragmented oxide scales.

Keywords

Hot-rolled steel plate Frizzles Fissures Skin laminations 

References

  1. 1.
    Verein Deutscher Eisenhüttenleute (VDEh) (ed.): Surface Defects in Hot Rolled Flat Steel Products, 2nd edn., pp. 14–20. Verlag Stahleisen GmbH, Düsseldorf (1996)Google Scholar
  2. 2.
    Roberts, W.L.: Cold Rolling of Steel, pp. 746–749. Marcel Dekker, New York (1978)Google Scholar

Copyright information

© ASM International 2009

Authors and Affiliations

  1. 1.R&D Centre for Iron and SteelSteel Authority of India LimitedRanchiIndia

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