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Galvannealed sheet is carbon steel coated with zinc on both sides by the continuous hot dip process. Immediately as the strip exists the coating bath, the zinc coating is subjected to an in-line heat treatment that converts the entire coating to a zinc iron alloy. Conversion to the alloy results in a non-spangled matte finish which makes the sheet suitable for painting. The coating is harder than a regular galvanized coating and is more resistant to scratching and manufacturing damage.
Galvannealed sheet is specifically designed to be used in the painted condition. After painting with properly selected primers and paints, the combined paint/galvannealed coating offers excellent resistance to peeling and/or blistering of the paint, compared with conventional galvanized sheet. The single largest use of this product is in automobiles.
Electrolytic zinc coated sheet steel is a product which has been given a thin coating of zinc applied on one or both sides by electrolytic deposition. Generally, the light two sided electrolytic zinc coated steel is not recommended for extended outdoor service. However, new heavier coating lines are now producing coatings that may be suitable for some exterior uses.
The coating of zinc by electrolytic deposition normally has a uniform dull gray matte appearance. The product is expected to match adjacent parts in an assembly after high gloss painting. Automotive body parts are an example of its use.
Thickness Tolerance Ranges
Source: ASTM A568Thickness Specifications
Note: Ordered coating weight is specified on a per-side basis.
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