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Defect Catalog Extract


Alternative term: Lap

Appearance: Areas of strong material
imprint forming hills or craters.


Alternative term: Massive rupture

Appearance: Opening, which completely penetrates the strip. It may occur in conjunction with other defects, e.g. damage.



Alternative terms: Groove, Gouge.

Appearance: Line-type defect, which runs longitudinal to the rolling direction.


Alternative terms: Seam, Sliver.

Appearance: Irregular, flaky overlapping material permeated with non-metallic inclusions.



Alternative terms: M-shaped Tongues,
Slab Defect

Appearance: M-shaped shell.

Edge Crack

Alternative term: Edge Fault

Appearance: Discontinuations of material from surface to surface at strip edges.


Rolled-In Dirt

Alternative terms: Rolled-in extraneous matter, Splinters

Appearance: Surface defects due to
rolling-in of extraneous metallic or
non-metallic material of any shape.

Longitudinal Crack

Appearance: Line-type defect that runs longitudinal to the rolling direction.


Slab Edge

Appearance: Line-type defect, which runs longitudinal to the rolling direction.

Heavy Scale

Alternative term: Rolled-in Primary Scale.

Appearance: Heavy scale appears as massively rolled-in scale on a larger surface, either spot like, streak like or section like.


Medium Scale (Scale Pits)

Alternative terms: Rolled-in Secondary Scale, Scale Stippling

Appearance: Scale pits are rolled-in secondary scale particles distributed
randomly through-out the strip,
characterized by dark spots followed
by dark tails.

Periodic Defect (Roll Mark)

Alternative terms: Imprint, Indentation.

Appearance: Roll marks occur as indentations on the top or bottom of the strip.



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Customer Examples

  • Algoma Steel
  • Arcelor
  • Baosteel
  • Corus
  • CSC
  • Duferco
  • Erdemir
  • Hadeed
  • JFE
  • Mittal
  • Mobarakeh Steel
  • Nippon Steel Corp
  • Nucor
  • Riva
  • Ruuki
  • Salzgitter
  • SSAB
  • Taiyuan Steel Engineering
  • ThyssenKrupp Stahl