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What is Hot Dip Galvanizing

Hot Dip Galvanizing is the process of dipping fabricated metal into kettle containing molten zinc.

This process provides significant advantage over other corrosion protection methods as the iron in the steel metallurgically reacts with the molten zinc and form a tightly-bonded alloy coating.

Hot Dip Galvanizing Processes
Hot Dip Galvanizing comprise three simples stages:

Surface Preparation

Hot Dip Galvanizing

Quality Inspection


Hot Dip Galvanizing Specification & Standards

Hot Dip Galvanizing is done in accordance with British Standard specification, BS EN ISO 1461 standard which specifies a minimum coating thickness to be applied to steel in relation to the steels section thickness.

Category Minimum Mean Coating Mass (g/sq m) and Thickness (um)
Not Centrifuged Steel Steel > 6mm in thickness 610 (g/sq m) 85 (um)
Steel > 3mm & <=6 mm in thickness 505 (g/sq m) 70 (um)
Steel > 1.5mm & <=3 mm in thickness 395 (g/sq m) 55 (um)
Steel > 1.5mm in thickness 325 (g/sq m) 45 (um)
Not Centrifuged Iron Casting Steel > 6mm in thickness 575 (g/sq m) 80 (um)
Steel < 6mm in thickness 505 (g/sq m) 70 (um)
Centrifuged Articles with Thread > 6mm in diameter 360 (g/sq m) 50 (um)
<=6 mm in diameter 180 (g/sq m) 25 (um)
Centrifuged Others Articles
(Including Iron Cast)
> 3mm in diameter 395 (g/sq m) 55 (um)
<=3 mm in diameter 325 (g/sq m) 45 (um)

Hot Dip Galvanizing Flow Chart