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Stricker mark - Heat treatment defects


Figure 1: Stricker mark.

Defect name: Stricker mark
Record No.: 353
Type of defect (Internal/Surface): Surface
Defect classification: Heat treatment defects
Steel name: Steel
Steel composition in weight %: No data.
Note:  This defect is shown in Fig. 1. It appears as a matt smudge on the sheet surface and results from the sticking of the sheet surfaces during annealing. The actual cause is the annealing temperature, and sticking is aggravated by smooth surface and any local pressure caused by bad shape, trapped edge scrap, scabs, etc., or badly shaped bases.
Note: Defects arising in annealing.
Reference: Not shown in this demonstration version.