Chain and wire marks - Hot-dip galvanized coating

Chain and wire marks - Hot-dip galvanized coating - Coating defects

Figure 1: Chain and wire marks (acceptable unless bare steel is exposed).

Defect name: Chain and wire marks
Record No.: 1706
Type of defect (Internal/Surface): Surface
Defect classification: Coating defects
Steel name: Steel
Steel composition in weight %: No data.
Note: Chain & wire marks: Another type of surface defect occurs when steel is lifted and transported using chains and wires attached to overhead cranes. Lifting devices can leave uncoated areas on the finished product that will need to be renovated. Superficial marks (Figure 14) left on the galvanized coating from the lifting attachments are not grounds for rejection unless the marks expose bare steel; in such a case, the galvanizer must repair the bare areas before the part is acceptable. One potential way to avoid these types of marks is to design permanent or temporary lifting points in the fabrication.
Reference: Not shown in this demonstration version.