Gathering Strength at Canton Fair. Aogang Metal from Aosen Special Steel Group exhibited galvanized wire, steel wire rope, steel strand and more. Our products meet Chinese, British and American standards, with custom options available. We communicated face-to-face with global buyers to explore potential cooperation at the 140th Canton Fair.

Wire drawing is done before galvanizing, so it sets the quality of the steel surface the zinc must bond to; poor drawing with excessive reduction, worn dies, bad lubrication, or leftover scale and lubricant leaves defects and stress in the wire that show up later as uneven, porous, or poorly adhered zinc coatings. 

Galvanized wire diameter tolerance is set by the product standard you order to, such as ASTM A641, EN 10244-2, or a buyer specification, and for drawn wire in the common 1.4 to 5.0 mm range it is normally a bilateral limit of about plus or minus 0.03 to 0.06 mm, verified with a micrometer at several points along the coil.

Zinc coating peels off steel wire most often because the steel surface was not clean enough before dipping, the zinc bath chemistry or temperature was off, or the alloy layer grew too thick and brittle; in short, peeling is almost always a bond or substrate problem rather than a fault in the zinc itself.

Zinc coating weight on galvanized wire is measured most reliably by the gravimetric strip method, which dissolves the zinc from a known length of wire and converts the mass loss to grams per square meter; this is the reference procedure in ASTM A90/A90M and EN 10244-2, and Aogang also offers non-destructive magnetic and XRF checks on its galvanized wire range.